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<front>
<journal-meta>
<journal-id journal-id-type="publisher">TC</journal-id>
<journal-title-group>
<journal-title>The Cryosphere</journal-title>
<abbrev-journal-title abbrev-type="publisher">TC</abbrev-journal-title>
<abbrev-journal-title abbrev-type="nlm-ta">The Cryosphere</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1994-0424</issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/tc-5-13-2011</article-id>
<title-group>
<article-title>Spatial distribution of pingos in northern Asia</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Grosse</surname>
<given-names>G.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Jones</surname>
<given-names>B. M.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Geophysical Institute, University of Alaska Fairbanks, USA</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>US Geological Survey, Alaska Science Center, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>07</day>
<month>01</month>
<year>2011</year>
</pub-date>
<volume>5</volume>
<issue>1</issue>
<fpage>13</fpage>
<lpage>33</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2011 G. Grosse</copyright-statement>
<copyright-year>2011</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://tc.copernicus.org/articles/5/13/2011/tc-5-13-2011.html">This article is available from https://tc.copernicus.org/articles/5/13/2011/tc-5-13-2011.html</self-uri>
<self-uri xlink:href="https://tc.copernicus.org/articles/5/13/2011/tc-5-13-2011.pdf">The full text article is available as a PDF file from https://tc.copernicus.org/articles/5/13/2011/tc-5-13-2011.pdf</self-uri>
<abstract>
<p>Pingos are prominent periglacial landforms in vast regions of the Arctic and
Subarctic. They are indicators of modern and past conditions of permafrost,
surface geology, hydrology and climate. A first version of a detailed
spatial geodatabase of 6059 pingo locations in a 3.5&amp;times;10&lt;sup&gt;6&lt;/sup&gt; km&lt;sup&gt;2&lt;/sup&gt;
region of northern Asia was assembled from topographic maps. A first order
analysis was carried out with respect to permafrost, landscape
characteristics, surface geology, hydrology, climate, and elevation datasets
using a Geographic Information System (GIS). Pingo heights in the dataset
vary between 2 and 37 m, with a mean height of 4.8 m. About 64% of the
pingos occur in continuous permafrost with high ice content and thick
sediments; another 19% in continuous permafrost with moderate ice content
and thick sediments. The majority of these pingos are likely hydrostatic
pingos, which are typical of those located in drained thermokarst lake
basins of northern lowlands with continuous permafrost. About 82% of the
pingos are located in the tundra bioclimatic zone. Most pingos in the
dataset are located in regions with mean annual ground temperatures between
−3 and −11 °C and mean annual air temperatures between −7 and −18 °C.
The dataset confirms that surface geology and hydrology are key factors for
pingo formation and occurrence. Based on model predictions for near-future
permafrost distribution, about 2073 pingos (34%) along the southern
margins of permafrost will be located in regions with thawing permafrost by
2100, which ultimately may lead to increased occurrence of pingo collapse.
Based on our dataset and previously published estimates of pingo numbers
from other regions, we conclude that there are more than 11 000 pingos on
Earth.</p>
</abstract>
<counts><page-count count="21"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple">Andreev, V. N.: Gidrolakkolity (bulgunnyakhi) v zapadno-sibirskykh tundrakh [Hydrolakkoliths (Bulgunnyakhs) in the west Siberian tundra], Isv. Russk. Geogr. Ob-va., 68(2), 1936 (in Russian).</mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple">Bobov, N. G.: Pingo formations under modern conditions in the watershed between the Lena and Vilyui Rivers, Geographical Series, Academy of the Sciences of the USSR, 5, 64–68, 1960. (in Russian)</mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple">Brown, R. J. E. and Pewe, T. L.: Distribution of permafrost in North America and its relationship to the environment – A review 1963–1973, in: The North American Contribution to the Second International Conference of Permafrost, Yakutsk, U.S.S.R., 71–100, 13–28 July 1973.</mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple">Brown, J., Ferrians, O. J., Heginbottom, J. A., and Melnikov, E.: Circum-Arctic Map of Permafrost and Ground-Ice Conditions, in: Circumpolar Active-Layer Permafrost System, Version 2.0, edited by: Parsons, M. and Zhang, T., International Permafrost Association Standing Committee on Data Information and Communication (comp.), 2003, National Snow and Ice Data Center/World Data Center for Glaciology, Boulder, CO, CD-ROM, 1998.</mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple">Carter, L. D. and Galloway, J. P.: Arctic Coastal Plain pingos in National Petroleum Reserve in Alaska, in: The United States Geological Survey in Alaska – Accomplishments during 1978, edited by: Johnson, K. M. and Williams, J. K., US Geological Survey Circular, 804-B, 33–35, 1979.</mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple">Craig, B. G.: Pingo in the Thelon Valley, Northwest Territories; Radio-carbon age and historical significance of the contained organic material, Geol. Soc. Am. Bull., 70, 509–510, 1959.</mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple">Ehlers, J. and Gibbard, P. L.: Extent and chronology of glaciations, Quaternary Sci. Rev., 22, 1561–1568, 2003.</mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple">Ershov, E. D., Kondrateeva, K. A., Loginov, V. F., and Sytchev, I. K.: Geocyological map of the Soviet Union [Geokryologitcheskaya karta SSSR], Scale 1:2 500 000, Moscow State University, 1991.</mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple">Esper Angillieri, M. Y.: A preliminary inventory of rock glaciers at 30° S latitude, Cordillera Frontal of San Juan, Argentina, Quatern. Int., 195, 151–157, 2009.</mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple">Evseev, V. P.: Pingos of segregated ice in the northeast of the European part of the U.S.S.R in Western Siberia, Problemy Kriolitologii, 5, 95–159, 1976 (in Russian).</mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple">Ferrians Jr., O. J.: Pingos on the Arctic Coastal Plain, northeastern Alaska, in: Fourth International Conference on Permafrost, Fairbanks, Alaska, University of Alaska, 105–106, 18–22 July 1983.</mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple">Ferrians Jr., O. J.: Pingos in Alaska: A review, in: Fifth International Conference on Permafrost, Norway, 734–739, 1988.</mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple">Flemal, R. C.: Pingos and pingo scars: Their characteristics, distribution, and utility in reconstructing former permafrost environments, Quaternary Res., 6, 37–53, 1976.</mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple">French, H. M.: Pingo investigations, Banks Island, District of Franklin, Geological Survey of Canada, 76-1A, 235–238, 1976.</mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple">French, H. M.: Past and present permafrost as an indicator of climate change, Polar Res., 18, 269–274, 1999.</mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple">Galloway, J. P. and Carter, L. D.: Preliminary map of pingos in National Petroleum Reserve in Alaska, U.S. Geological Survey Open-File Report 78-795, 1 sheet, scale 1:500,000, 1978.</mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple">GLOBE Task Team: The Global Land One-kilometer Base Elevation (GLOBE) Digital Elevation Model, Version 1.0, National Oceanic and Atmospheric Administration, National Geophysical Data Center, Boulder, Colorado, USA, 1999.</mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple">Grave, N. A.: On the archaeological dating of hydrolaccoliths on the Chukotka Peninsula, Dokl. Akad. Nauk, 106, 706–707, 1956 (in Russian).</mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple">Grosse, G., Schirrmeister, L., and Malthus, T. J.: Application of Landsat-7 satellite data and a DEM for the quantification of thermokarst-affected terrain types in the periglacial Lena-Anabar coastal lowland, Polar Res., 25, 51–67, 2006.</mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple">Grosse, G., Schirrmeister, L., Siegert, C., Kunitsky, V. V., Slagoda, E. A., Andreev, A. A., and Dereviagyn, A. Y.: Geological and geomorphological evolution of a sedimentary periglacial landscape in Northeast Siberia during the Late Quaternary, Geomorphology, 86, 25–51, 2007.</mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple">Gurney, S. D.: Aspects of the genesis and geomorphology of pingos: perennial permafrost mounds, Prog. Phys. Geog., 22, 307–324, 1998.</mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple">Gurney, S. D.: Aspects of the genesis, geomorphology and terminology of palsas: perennial cryogenic mounds, Prog. Phys. Geog., 25, 249–260, 2001.</mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple">Hamilton, T. D. and Obi, C. M.: Pingos in the Brooks Range, Northern Alaska, USA, Arctic Alpine Res., 14, 13–20, 1982.</mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple">Harris, S. A.: Identification of permafrost zones using selected permafrost landforms, in: Proceedings of the fourth Canadian Permafrost Conference, 1982, 49–58, 1982.</mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple">Hinkel, K. M., Frohn, R. C., Nelson, F. E., Eisner, W. R., and Beck, R. A.: Morphometric and spatial analysis of thaw lakes and drained thaw lake basins in the Western Arctic Coastal Plain, Alaska, Permafrost Periglac., 16, 327–341, 2005.</mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple">Hinzman, L. D., Bettez, N. D., Bolton, W. R., Chapin, F. S., Dyurgerov, M. B., Fastie, C. L., Griffith, B., Hollister, R. D., Hope, A., Huntington, H. P., Jensen, A. M., Jia, G. J., Jorgenson, T., Kane, D. L., Klein, D. R., Kofinas, G., Lynch, A. H., Lloyd, A. H., McGuire, A. D., Nelson, F. E., Oechel, W. C., Osterkamp, T. E., Racine, C. H., Romanovsky, V. E., Stone, R. S., Stow, D. A., Sturm, M., Tweedie, C. E., Vourlitis, G. L., Walker, M. D., Walker, D. A., Webber, P. J., Welker, J. M., Winker, K. S., and Yoshikawa, K.: Evidence and Implications of Recent Climate Change in Northern Alaska and Other Arctic Regions, Climatic Change, 72, 251–298, 2005.</mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple">Holmes, G. H., Foster, H. L., and Hopkins, D. M.: Distribution and age of pingos of Interior Alaska, in: Proceedings Permafrost International Conference, N.R.C. Publication 1287, Washington, D.C., National Academy of Sciences, 88–93, 1966.</mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple">Holmes, G. W., Hopkins, D. M., and Foster, H.: Pingos in central Alaska, US Geological Survey Bulletin, 1241-H, Washington, H1–H40, 44 pages, 1968.</mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple">Hughes, O. L.: Distribution of open system pingos in central Yukon Territory with respect to glacial limits, Geological Survey of Canada, Paper 69-34, 1969.</mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple">Huijzer, B. and Vandenberghe, J.: Climatic reconstruction of the Weichselian Pleniglacial in northwestern and Central Europe, J. Quaternary Sci., 13, 391–417, 1998.</mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple">Isarin, R. F. B.: Permafrost distribution and temperatures in Europe during the Younger Dryas, Permafrost Periglac., 8, 313–333, 1997.</mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple">Jin, H. J., Chang, X. L., and Wang, S. L.: Evolution of permafrost on the Qinghai-Xizang (Tibet) Plateau since the end of the late Pleistocene, J. Geophys. Res., 112, F02S09, https://doi.org/10.1029/2006JF000521, 2007.</mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple">Jorgenson, T., Yoshikawa, K., Kanevskiy, M., Shur, Y., Romanovsky, V., Marchenko, S., Grosse, G., Brown, J., and Jones, B.: Permafrost characteristics of Alaska, in: Proceedings of the Ninth International Conference on Permafrost, Fairbanks, Alaska, 29 June–3 July 2008.</mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple">Kotlyakov, V. and Khromova, T.: Permafrost, Snow and Ice, in: Land Resources of Russia, Digital Media, edited by: Stolbovoi, V. and McCallum, I., International Institute for Applied Systems Analysis and the Russian Academy of Science, Laxenburg, Austria, 2002.</mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple">Lagerbäck, R. and Rohde, L.: Pingos in northernmost Sweden, Geogr. Ann. A, 67(3–4), 239–245, 1985.</mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple">Leffingwell, E. d. K.: The Canning River region, northern Alaska, in: United States Geological Survey Professional Paper 109, USGS, Washington, DC, 251, 1919.</mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple">Lehner, B. and Döll, P.: Development and validation of a global database of lakes, reservoirs and wetlands, J. Hydrol., 296, 1–22, 2004.</mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple">Lomborinchen, R.: Frost heaving and related landforms, Mongolia, Permafrost Periglac., 11, 85–90, 2000.</mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple">Luoto, M. and Seppälä, M.: Modelling the distribution of palsas in Finnish Lapland with logistic regression and GIS, Permafrost Periglac., 13, 17–28, 2002.</mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Pingos of the Pleistocene Mackenzie Delta area, Geographical Bulletin, 18, 21–63, 1962.</mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Pingos in Canada, in: First International Conference on Permafrost, Lafayette, Indiana, 1963, National Academy of Science – National Research Council, Washington, D.C., Publication 1287, 108–113, 1966.</mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: The world of underground ice, Ann. Assoc. Am. Geogr., 62, 1–22, 1972.</mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Age of Ibyuk Pingo, Tuktoyaktuk Peninsula, District of Mackenzie, Geological Survey of Canada, 76(1B), 59–60, 1976.</mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Contemporary pingos; a discussion, Biuletyn Peryglacjalny, 27, 133–154, 1978a.</mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Sub-pingo water lenses, Tuktoyaktuk Peninsula, Northwest Territories, Can. J. Earth Sci., 15, 1219–1227, 1978b.</mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Pingos of the Tuktoyaktuk Peninsula area, Northwest Territories, Geogr. Phys. Quatern., 33, 3–61, 1979.</mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Growth of Ibyuk Pingo, western Arctic coast, Canada, and some implications for environmental reconstructions, Quaternary Res., 26, 68–80, 1986.</mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Some mechanical aspects of pingo growth and failure, western Arctic coast, Canada, Can. J. Earth Sci., 24, 1108–1119, 1987.</mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Pingo collapse and paleoclimatic reconstruction, Can. J. Earth Sci., 25, 495–511, 1988.</mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple">Mackay, J. R.: Pingo growth and collapse, Tuktoyaktuk Peninsula Area, Western Arctic Coast, Canada: A long-term field study, Geogr. Phys. Quatern., 52, 271–323, 1998.</mixed-citation>
</ref>
<ref id="ref51">
<label>51</label><mixed-citation publication-type="other" xlink:type="simple">Marsh, P., Russell, M., Pohl, S., Haywood, H., and Onclin, C.: Changes in thaw lake drainage in the Western Canadian Arctic from 1950 to 2000, Hydrol. Process., 23, 145–158, 2009.</mixed-citation>
</ref>
<ref id="ref52">
<label>52</label><mixed-citation publication-type="other" xlink:type="simple">Matsuoka, N.: Solifluction rates, processes and landforms: a global review, Earth-Sci. Rev., 55, 107–134, 2001.</mixed-citation>
</ref>
<ref id="ref53">
<label>53</label><mixed-citation publication-type="other" xlink:type="simple">Mazhitova, G. and Oberman, N.: Permafrost of the Usa River Basin, National Snow and Ice Data Center/World Data Center for Glaciology, Boulder, CO, Digital Media, 2003.</mixed-citation>
</ref>
<ref id="ref54">
<label>54</label><mixed-citation publication-type="other" xlink:type="simple">Mitchell, G. F.: Fossil pingos in the south of Ireland, Nature, 230, 43–44, 1971.</mixed-citation>
</ref>
<ref id="ref55">
<label>55</label><mixed-citation publication-type="other" xlink:type="simple">Müller, F.: Observations on pingos – Detailed studies in East Greenland and the Canadian Arctic [Beobachtungen über Pingos, Detailuntersuchungen in Ostgrönland und in der Kanadischen Arktis], Meddelelser om Grønland, 153(3), 127 pp., 1959.</mixed-citation>
</ref>
<ref id="ref56">
<label>56</label><mixed-citation publication-type="other" xlink:type="simple">Nelson, F. E.: Cryoplanation terrace orientation in Alaska, Geogr. Ann. A, 80, 135–151, 1998.</mixed-citation>
</ref>
<ref id="ref57">
<label>57</label><mixed-citation publication-type="other" xlink:type="simple">New, M., Hulme, M., and Jones, P. D.: Representing twentieth century space-time climate variability, part 1: development of a 1961–90 mean monthly terrestrial climatology, J. Climate, 12, 829–856, 1999.</mixed-citation>
</ref>
<ref id="ref58">
<label>58</label><mixed-citation publication-type="other" xlink:type="simple">Pissart, A.: Palsas, lithalsas and remnants of these periglacial mounds, A progress report, Prog. Phys. Geog., 26, 605–621, 2002.</mixed-citation>
</ref>
<ref id="ref59">
<label>59</label><mixed-citation publication-type="other" xlink:type="simple">Popov, A. I., Kachurin, S. P., and Grave, N. A.: Features of the development of frozen geomorphology in northern Eurasia, in: First International Conference on Permafrost, Lafayette, Indiana, 1963, National Academy of Science, National Research Council, Washington, D.C., Publication 1287, 181–185, 1963.</mixed-citation>
</ref>
<ref id="ref60">
<label>60</label><mixed-citation publication-type="other" xlink:type="simple">Porsild, A. E.: Earth mounds in unglaciated arctic northwestern America, Geogr. Rev., 28(1), 46–58, 1938.</mixed-citation>
</ref>
<ref id="ref61">
<label>61</label><mixed-citation publication-type="other" xlink:type="simple">Romanovskii, N. N.: Fundamentals of cryogenesis of lithosphere, Moscow University Press, Moscow, Russia, 336, 1993 (in Russian).</mixed-citation>
</ref>
<ref id="ref62">
<label>62</label><mixed-citation publication-type="other" xlink:type="simple">Romanovskii, N. N., Hubberten, H.-W., Gavrilov, A. V., Tumskoy, V. E., and Kholodov, A. L.: Permafrost of the east Siberian Arctic shelf and coastal lowlands, Quaternary Sci. Rev., 23, 1359–1369, 2004.</mixed-citation>
</ref>
<ref id="ref63">
<label>63</label><mixed-citation publication-type="other" xlink:type="simple">Romanovsky, V. E., Kholodov, A. L., Marchenko, S. S., Oberman, N. G., Drozdov, D. S., Malkova, G. V., Moskalenko, N. G., Vasiliev, A. A., Sergeev, D. O., and Zheleznyak, M. N.: Thermal State and Fate of Permafrost in Russia: First Results of IPY, in: Proceedings of the Ninth International Conference on Permafrost, Fairbanks, Alaska, 1511–1518, 29 June–3 July 2008.</mixed-citation>
</ref>
<ref id="ref64">
<label>64</label><mixed-citation publication-type="other" xlink:type="simple">Romanovsky, V. E., Drozdov, D. S., Oberman, N. G., Malkova, G. V., Kholodov, A. L., Marchenko, S. S., Moskalenko, N. G., Sergeev, D. O., Ukraintseva, N. G., Abramov, A. A., Gilichinsky, D. A., and Vasiliev, A. A.: Thermal state of permafrost in Russia, Permafrost Periglac., 21, 136–155, 2010.</mixed-citation>
</ref>
<ref id="ref65">
<label>65</label><mixed-citation publication-type="other" xlink:type="simple">Ross, N., Harris, C., Christiansen, H. H., and Brabham, P. J.: Ground penetrating radar investigation of open system pingos, Adventdalen, Svalbard, Norweg. J. Geograph., 59, 129–138, 2005.</mixed-citation>
</ref>
<ref id="ref66">
<label>66</label><mixed-citation publication-type="other" xlink:type="simple">Ross, N., Brabham, P. J., Harris, C., and Christiansen, H. H.: Internal structure of open system pingos, Adventdalen, Svalbard: The use of resistivity tomography to assess ground-ice conditions, J. Environ. Eng. Geophy., 12, 113–126, https://doi.org/10.2113/JEEG12.1.113, 2007.</mixed-citation>
</ref>
<ref id="ref67">
<label>67</label><mixed-citation publication-type="other" xlink:type="simple">Sazonova, T. S. and Romanovsky, V. E.: A model for regional-scale estimation of temporal and spatial variability of active layer thickness and mean annual ground temperatures, Permafrost Periglac., 14, 125–139, 2003.</mixed-citation>
</ref>
<ref id="ref68">
<label>68</label><mixed-citation publication-type="other" xlink:type="simple">Schirrmeister, L., Kunitsky, V., Grosse, G., Wetterich, S., Meyer, H., Schwamborn, G., Babiy, O., Derevyagin, A., and Siegert, C.: Sedimentary characteristics and origin of the Late Pleistocene Ice Complex on North-East Siberian Arctic coastal lowlands and islands – a review, Quatern. Int., https://doi.org/10.1016/j.quaint.2010.04.004, in press, 2010.</mixed-citation>
</ref>
<ref id="ref69">
<label>69</label><mixed-citation publication-type="other" xlink:type="simple">Shumskii, P. A. and Vtyurin, B. I.: Underground ice, in: First International Conference on Permafrost, Lafayette, Indiana, 1963, National Academy of Science, National Research Council, Washington, D.C., Publication 1287, 108–113, 1966.</mixed-citation>
</ref>
<ref id="ref70">
<label>70</label><mixed-citation publication-type="other" xlink:type="simple">Soloviev, P. A.: Bulgunnyakhi Zentralnoi Yakutii [Bulgunnyakhs of Central Yakutia], in: Investigation of permafrost in the Yakutian ASSR [Issledovanie vechnoi merzloty v YaASSR], Moscow, Publishing House Acad. Science SSSR, 226–258, 1952 (in Russian).</mixed-citation>
</ref>
<ref id="ref71">
<label>71</label><mixed-citation publication-type="other" xlink:type="simple">Soloviev, P. A.: Thermokarst phenomena and landforms due to frostheaving in central Yakutia, Biuletyn Peryglacjalny, 23, 135–155, 1973.</mixed-citation>
</ref>
<ref id="ref72">
<label>72</label><mixed-citation publication-type="other" xlink:type="simple">Stager, J. K.: Progress report on the analysis of the characteristics and distribution of pingos east of the Mackenzie Delta, Can. Geogr., 7, 13–20, 1956.</mixed-citation>
</ref>
<ref id="ref73">
<label>73</label><mixed-citation publication-type="other" xlink:type="simple">Stolbovoi, V. and McCallum, I.: Land Resources of Russia, Digital Media, International Institute for Applied Systems Analysis and the Russian Academy of Science, Laxenburg, Austria, 2002.</mixed-citation>
</ref>
<ref id="ref74">
<label>74</label><mixed-citation publication-type="other" xlink:type="simple">Stolbovoi, V., Fischer, G., Ovechkin, V. S., and Rozhkova, S.: Vegetation, The IIASA-LUC Project Georeferenced Database of the Former U.S.S.R., Vol. 4: Vegetation, Interim Report IR-98, in: Land Resources of Russia, edited by: Stolbovoi, V. and McCallum, I., Digital Media, International Institute for Applied Systems Analysis and the Russian Academy of Science, Laxenburg, Austria, 2002, 1998.</mixed-citation>
</ref>
<ref id="ref75">
<label>75</label><mixed-citation publication-type="other" xlink:type="simple">Stolbovoi, V., Savin, I., Sheremet, B., and Kolesnikova, L.: Soil Reference Profiles, in: Land Resources of Russia, edited by: Stolbovoi, V. and McCallum, I., Digital Media, International Institute for Applied Systems Analysis and the Russian Academy of Science, Laxenburg, Austria, 2002, 2002.</mixed-citation>
</ref>
<ref id="ref76">
<label>76</label><mixed-citation publication-type="other" xlink:type="simple">Tolstikhin, N. I.: Podzemnye vody Zabaikalya i ikh gidrolakkolity [Groundwater in Zabaikalia and Hydrolakkoliths], Tr. Kom. lo vetshn. Merslote, 1932 (in Russian).</mixed-citation>
</ref>
<ref id="ref77">
<label>77</label><mixed-citation publication-type="other" xlink:type="simple">Vandenberghe, J. and Pissart, A.: Permafrost changes in Europe during the last glacial, Permafrost Periglac., 4, 121–135, 1993.</mixed-citation>
</ref>
<ref id="ref78">
<label>78</label><mixed-citation publication-type="other" xlink:type="simple">Vasilchuk, Y. K. and Budantseva, N. A.: Radiouglerodnoe opredelenye vosrasta bulgunnyakha na mestoroshdenii peszovoe v severnoi zhasti Sapadnoi Sibiri [Radiocarbon dating of the pingo in the Pestsovoye gas field in the North of West Siberia], Eng. Geol., 14–21 July 2010 (in Russian).</mixed-citation>
</ref>
<ref id="ref79">
<label>79</label><mixed-citation publication-type="other" xlink:type="simple">Walker, D. A., Walker, M. D., Everett, K. R., and Webber, P. J.: Pingos of the Prudhoe Bay Region, Alaska, Arctic Alpine Res., 17, 321–336, 1985.</mixed-citation>
</ref>
<ref id="ref80">
<label>80</label><mixed-citation publication-type="other" xlink:type="simple">Walker, D. A., Epstein, H. E., Romanovsky, V. E., Ping, C. L., Michaelson, G. J., Daanen, R. P., Shur, Y., Peterson, R. A., Krantz, W. B., Raynolds, M. K., Gould, W. A., Gonzalez, G., Nicolsky, D. J., Vonlanthen, C. M., Kade, A. N., Kuss, P., Kelley, A. M., Munger, C. A., Tarnocai, C. T., Matveyeva, N. V., and Daniëls, F. J. A.: Arctic patterned-ground ecosystems: A synthesis of field studies and models along a North American Arctic Transect, J. Geophys. Res., 113, G03S01, https://doi.org/10.1029/2007JG000504, 2008.</mixed-citation>
</ref>
<ref id="ref81">
<label>81</label><mixed-citation publication-type="other" xlink:type="simple">Walker, M. D., Everett, K. R., Walker, D. A., and Birkeland, P. W.: Soil Development as an Indicator of Relative Pingo Age, Northern Alaska, USA, Arctic Alpine Res., 28, 352–362, 1996.</mixed-citation>
</ref>
<ref id="ref82">
<label>82</label><mixed-citation publication-type="other" xlink:type="simple">Walter, K. M., Edwards, M. E., Grosse, G., Zimov, S. A., and Chapin III, F. S.: Thermokarst lakes as a source of atmospheric CH4 during the last deglaciation, Science, 318, 633–636, https://doi.org/10.1126/science.1142924, 2007.</mixed-citation>
</ref>
<ref id="ref83">
<label>83</label><mixed-citation publication-type="other" xlink:type="simple">Wang, B. and French, H. M.: Permafrost on the Tibet Plateau, China, Quaternary Sci. Rev., 14, 255–274, 1995.</mixed-citation>
</ref>
<ref id="ref84">
<label>84</label><mixed-citation publication-type="other" xlink:type="simple">Washburn, A. L.: Permafrost features as evidence of climatic change, Earth-Sci. Rev., 15, 327–402, 1980.</mixed-citation>
</ref>
<ref id="ref85">
<label>85</label><mixed-citation publication-type="other" xlink:type="simple">Worsley, P. and Gurney, S. D.: Geomorphology and hydrogeological significance of the Holocene pingos in the Karup Valley area, Traill Island, northern east Greenland, J. Quaternary Sci., 11, 249–262, 1996.</mixed-citation>
</ref>
<ref id="ref86">
<label>86</label><mixed-citation publication-type="other" xlink:type="simple">Worsley, P., Gurney, S. D., and Collins, P. E. F.: Late holocene &quot;mineral palsas&quot; and associated vegetation patterns: A case study from Lac Hendry, Northern Quebec, Canada and significance for European Pleistocene Thermokarst, Quaternary Sci. Rev., 14, 179–192, 1995.</mixed-citation>
</ref>
<ref id="ref87">
<label>87</label><mixed-citation publication-type="other" xlink:type="simple">Yoshikawa, K.: Age of growth of two pingos, Sarqaq Dalen, West Central Greenland, Permafrost Periglac., 2, 245–252, 1991.</mixed-citation>
</ref>
<ref id="ref88">
<label>88</label><mixed-citation publication-type="other" xlink:type="simple">Yoshikawa, K. and Harada, K.: Observations on nearshore pingo growth, Adventdalen, Spitsbergen, Permafrost Periglac., 6, 361–372, 1995.</mixed-citation>
</ref>
<ref id="ref89">
<label>89</label><mixed-citation publication-type="other" xlink:type="simple">Yoshikawa, K., Leuschen, C., Ikeda, A., Harada, K., Gogineni, P., Hoekstra, P., Hinzman, L., Sawada, Y., and Matsuoka, N.: Comparison of geophysical investigations for detection of massive ground ice (pingo ice), J. Geophys. Res., 111, EO6S19, https://doi.org/10.1029/2005JE002573, 2006.</mixed-citation>
</ref>
</ref-list>
</back>
</article>