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Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica
| Title: | Thermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica |
| Authors: | Minowa, Masahiro Browse this author | | Sugiyama, Shin Browse this author →KAKEN DB | | Ito, Masato Browse this author | | Yamane, Shiori Browse this author | | Aoki, Shigeru Browse this author →KAKEN DB |
| Issue Date: | 9-Jul-2021 |
| Publisher: | Nature Portfolio |
| Journal Title: | Nature communications |
| Volume: | 12 |
| Issue: | 1 |
| Start Page: | 4209 |
| Publisher DOI: | 10.1038/s41467-021-23534-w |
| Abstract: | Basal melting of ice shelves is considered to be the principal driver of recent ice mass loss in Antarctica. Nevertheless, in-situ oceanic data covering the extensive areas of a subshelf cavity are sparse. Here we show comprehensive structures of temperature, salinity and current measured in January 2018 through four boreholes drilled at a similar to 3-km-long ice shelf of Langhovde Glacier in East Antarctica. The measurements were performed in 302-12m-thick ocean cavity beneath 234-412m-thick ice shelf. The data indicate that Modified Warm Deep Water is transported into the grounding zone beneath a stratified buoyant plume. Water at the ice-ocean interface was warmer than the in-situ freezing point by 0.65-0.95 degrees C, leading to a mean basal melt rate estimate of 1.42ma(-1). Our measurements indicate the existence of a density-driven water circulation in the cavity beneath the ice shelf of Langhovde Glacier, similar to that proposed for warm-ocean cavities of larger Antarctic ice shelves. Basal melting of ice shelves is the principal driver of recent ice mass loss in Antarctica. The study reports comprehensive structures of temperature, salinity and current under an ice shelf in East Antarctica obtained by borehole measurements. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82802 |
| 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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