22 Dec 2022
22 Dec 2022
Status: this preprint is currently under review for the journal TC.

Asynchronous glacial extent during the Last Glacial Maximum in Ih Bogd massif of Gobi-Altay range, southwestern Mongolia: Aspect control on glacier mass balance

Purevmaa Khandsuren1, Yeong Bae Seong1, Hyun Hee Rhee2, Cho-Hee Lee1, Mehmet Akif Sarikaya3, Jeong-Sik Oh4, Khadbaatar Sandag5, and Byung Yong Yu6 Purevmaa Khandsuren et al.
  • 1Department of Geography, Korea University, Seoul 02841, Korea
  • 2Division of Glacial Environment Research, Korea Polar Research Institute, Incheon 21990, Korea
  • 3Istanbul Technical University, Eurasian Institute of Earth Science, Sarıyer-Istanbul, 34469, Turkey
  • 4Department of Geography, Dongguk University, Seoul 04620, Korea
  • 5Department of Geography, Mongolian National University of Education, Ulaanbaatar 210648, Mongolia
  • 6AMS laboratory, Korea Institute of Science and Technology, Seoul 02792, Korea

Abstract. Most mid-latitude mountain glaciers reached their maximum extent around the global Last Glacial Maximum (gLGM). However, some also strongly responded to the regional climate change or local non-climatic factors such as topography, leading to asynchronous maximum advances. This study documents the maximum extent and chronology of two paleoglaciers in the Ih Bogd massif of Mongolia: one facing north into the Jargalant Valley and the other facing south into the Ih Artsan valley. 10Be surface exposure age dating revealed that the Ih Artsan short valley glacier reached its maximum position (MIh1) around 20.1 ± 0.7 ka, coinciding with the gLGM. In contrast, the Jargalant paleoglacier (MJ1) reached its maximum extent around 17.2 ± 1.5 ka, around Heinrich 1 stadial and during the post-gLGM northern hemisphere warming. Our 2D ice surface model, which includes the temperature-index melt model, suggests that an aspect can result in a melt difference between north and south-facing slopes. Glaciers retreated from their maximum modeled extent asynchronously when we assign a 0.5 ℃ lower temperature for Jargalant valley (northern slope), based on the observation that present-day mean annual Jargalant temperatures are lower than in the south-facing Ih Arstan. Modelled timing of the maximum extents (20.23 ka in Ih Artsan, 17.13 ka in Jargalant) are consistent with 10Be exposure age results (20.1 ka in Ih Artsan, 17.2 ka in Jargalant). We also observed several sequences of post LGM or/and Holocene moraines in both cirques. Extremely old ages ranging from 636.2 ka to 35.9 ka were measured for the inner moraines in the Jargalant cirque (MJ2–MJ4), suggesting a problem with inheritance from boulders eroded from the summit plateau.

Purevmaa Khandsuren et al.

Status: open (until 16 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-238', Jigjidsurengiin Batbaatar, 19 Jan 2023 reply
  • RC2: 'Comment on tc-2022-238', Robin Blomdin, 25 Jan 2023 reply

Purevmaa Khandsuren et al.

Purevmaa Khandsuren et al.


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Short summary
Moraine is one of the awe-inspiring landscapes in alpine, archiving information of past climate. We measured the timing of moraine formation on the Ih Bogd massif, southern Mongolia. Glaciers move synchronously in a region as a response to changing climate but our glacier on northern slope reached most extensively 3 millennia later than southern one. We further ran 2D Ice Surface model and found the diachronous behavior of glacier was real. Aspect also control the nutrition of alpine glacier.