Preprints
https://doi.org/10.5194/tc-2018-75
https://doi.org/10.5194/tc-2018-75
14 May 2018
 | 14 May 2018
Status: this preprint was under review for the journal TC. A revision for further review has not been submitted.

Satellite ice extent, sea surface temperature, and atmospheric methane trends in the Barents and Kara seas

Ira Leifer, F. Robert Chen, Thomas McClimans, Frank Muller Karger, and Leonid Yurganov

Abstract. Long-term (2003–2015) satellite-derived sea-ice extent, sea surface temperature (SST), and lower tropospheric methane (CH4) of the Barents and Kara Seas (BKS) were analyzed for statistically significant anomalies and trends for 10 focus areas and on a pixel basis that were related to currents and bathymetry. Large positive CH4 anomalies were discovered around Franz Josef Land (FJL) and offshore west Novaya Zemlya in September. Far smaller CH4 enhancement was around Svalbard, downstream of known seabed seepage.

Strongest SST increase was southeast Barents Sea in June due to strengthening of the warm Murman Current (MC) and in the south Kara Sea in September, when the cold Percey Current weakens. These regions and around FJL exhibit the strongest CH4 growth. Likely sources are CH4 seepage from subsea permafrost and hydrates and the petroleum reservoirs underlying the central and east Barents Sea and the Kara Sea. The spatial pattern was poorly related to depth, and better explained by shoaling. Peak CH4 anomaly is several months after peak SST, consistent with a several month delay between SST and seabed temperature. Continued MC strengthening will increase heat transfer to the BKS, rendering the Barents Sea ice-free in about 15 years.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Ira Leifer, F. Robert Chen, Thomas McClimans, Frank Muller Karger, and Leonid Yurganov
 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Ira Leifer, F. Robert Chen, Thomas McClimans, Frank Muller Karger, and Leonid Yurganov
Ira Leifer, F. Robert Chen, Thomas McClimans, Frank Muller Karger, and Leonid Yurganov

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Latest update: 26 May 2024
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Short summary
Based on long-term satellite data of sea surface temperature and methane in the Barents and Kara Seas trends of increasing methane and sea surface temperature were found that were related to strengthening currents with strong methane anomalies near Franz Josef Land and Novaya Zemlya. Likely sources are methane seepage from subsea permafrost and hydrates, with current shoaling aiding the transport of near seabed dissolved methane to upper waters and the atmosphere.