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Modeling Antarctic ice shelf responses to future climate changes and impacts on the ocean
| Title: | Modeling Antarctic ice shelf responses to future climate changes and impacts on the ocean |
| Authors: | Kusahara, Kazuya Browse this author →KAKEN DB | | Hasumi, Hiroyasu Browse this author →KAKEN DB |
| Keywords: | Antarctic ice shelves | | basal melt | | ice shelf-sea ice-ocean model | | climate change |
| Issue Date: | May-2013 |
| Publisher: | Amer geophysical union |
| Journal Title: | Journal of Geophysical Research, Oceans |
| Volume: | 118 |
| Issue: | 5 |
| Start Page: | 2454 |
| End Page: | 2475 |
| Publisher DOI: | 10.1002/jgrc.20166 |
| Abstract: | We investigate basal melting of all Antarctic ice shelves by a circumpolar ice shelf-sea ice-ocean coupled model and estimate the total basal melting of 770-944Gt/yr under present-day climate conditions. We present a comparison of the basal melting with previous observational and modeling estimates for each ice shelf. Heat sources for basal melting are largely different among the ice shelves. Sensitivities of the basal melting to surface air warming and to enhanced westerly winds over the Antarctic Circumpolar Current are investigated from a series of numerical experiments. In this model the total basal melting strongly depends on the surface air warming but is hardly affected by the change of westerly winds. The magnitude of the basal melting response to the warming varies widely from one ice shelf to another. The largest response is found at ice shelves in the Bellingshausen Sea, followed by those in the Eastern Weddell Sea and the Indian sector. These increases of basal melting are caused by increases of Circumpolar Deep Water and/or Antarctic Surface Water into ice shelf cavities. By contrast, basal melting of ice shelves in the Ross and Weddell Seas is insensitive to the surface air warming, because even in the warming experiments there is high sea ice production at the front of the ice shelves that keeps the water temperature to the surface freezing point. Weakening of the thermohaline circulation driven by Antarctic dense water formation under warming climate conditions is enhanced by basal melting of ice shelves. |
| Rights: | Copyright 2013 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/53626 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 草原 和弥
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