Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming
This study investigates the effect of sea ice reduction on Arctic cloud cover in historical simulations with the coupled atmosphere–ocean general circulation model MIROC5. During simulated global warming since the 1970s, the Arctic sea ice extent has reduced substantially, particularly in September....
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ftcopernicus:oai:publications.copernicus.org:acpd30796 2023-05-15T14:35:29+02:00 Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming Abe, M. Nozawa, T. Ogura, T. Takata, K. 2018-08-11 application/pdf https://doi.org/10.5194/acpd-15-17527-2015 https://www.atmos-chem-phys-discuss.net/acp-2015-415/ eng eng doi:10.5194/acpd-15-17527-2015 https://www.atmos-chem-phys-discuss.net/acp-2015-415/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acpd-15-17527-2015 2019-12-24T09:53:20Z This study investigates the effect of sea ice reduction on Arctic cloud cover in historical simulations with the coupled atmosphere–ocean general circulation model MIROC5. During simulated global warming since the 1970s, the Arctic sea ice extent has reduced substantially, particularly in September. This simulated reduction is consistent with satellite observation results. However, the Arctic cloud cover increases significantly during October at grids with significant reductions in sea ice because of the enhanced heat and moisture flux from the underlying ocean. Cloud fraction increases in the lower troposphere. However, the cloud fraction in the surface thin layers just above the ocean decreases despite the increased moisture because the surface air temperature rises strikingly in the thin layers and the relative humidity decreases. As the cloud cover increases, the cloud radiative effect in surface downward longwave radiation (DLR) increases by approximately 40–60 % compared to a change in clear-sky surface DLR. These results suggest that an increase in the Arctic cloud cover as a result of a reduction in sea ice could further melt the sea ice and enhance the feedback processes of the Arctic amplification in future projections. Text Arctic Global warming Sea ice Copernicus Publications: E-Journals Arctic |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
This study investigates the effect of sea ice reduction on Arctic cloud cover in historical simulations with the coupled atmosphere–ocean general circulation model MIROC5. During simulated global warming since the 1970s, the Arctic sea ice extent has reduced substantially, particularly in September. This simulated reduction is consistent with satellite observation results. However, the Arctic cloud cover increases significantly during October at grids with significant reductions in sea ice because of the enhanced heat and moisture flux from the underlying ocean. Cloud fraction increases in the lower troposphere. However, the cloud fraction in the surface thin layers just above the ocean decreases despite the increased moisture because the surface air temperature rises strikingly in the thin layers and the relative humidity decreases. As the cloud cover increases, the cloud radiative effect in surface downward longwave radiation (DLR) increases by approximately 40–60 % compared to a change in clear-sky surface DLR. These results suggest that an increase in the Arctic cloud cover as a result of a reduction in sea ice could further melt the sea ice and enhance the feedback processes of the Arctic amplification in future projections. |
format |
Text |
author |
Abe, M. Nozawa, T. Ogura, T. Takata, K. |
spellingShingle |
Abe, M. Nozawa, T. Ogura, T. Takata, K. Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming |
author_facet |
Abe, M. Nozawa, T. Ogura, T. Takata, K. |
author_sort |
Abe, M. |
title |
Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming |
title_short |
Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming |
title_full |
Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming |
title_fullStr |
Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming |
title_full_unstemmed |
Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming |
title_sort |
effect of retreating sea ice on arctic cloud cover in simulated recent global warming |
publishDate |
2018 |
url |
https://doi.org/10.5194/acpd-15-17527-2015 https://www.atmos-chem-phys-discuss.net/acp-2015-415/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Global warming Sea ice |
genre_facet |
Arctic Global warming Sea ice |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acpd-15-17527-2015 https://www.atmos-chem-phys-discuss.net/acp-2015-415/ |
op_doi |
https://doi.org/10.5194/acpd-15-17527-2015 |
_version_ |
1766308301435305984 |