Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL077430 |
Variation in the Distribution and Properties of Circumpolar Deep Water in the Eastern Amundsen Sea, on Seasonal Timescales, Using Seal-Borne Tags | |
Mallett, Helen K. W.1; Boehme, Lars2; Fedak, Mike2; Heywood, Karen J.1; Stevens, David P.1; Roquet, Fabien3,4 | |
2018-05-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:10页码:4982-4990 |
文章类型 | Article |
语种 | 英语 |
国家 | England; Scotland; Sweden |
英文摘要 | In the Amundsen Sea, warm saline Circumpolar Deep Water (CDW) crosses the continental shelf toward the vulnerable West Antarctic ice shelves, contributing to their basal melting. Due to lack of observations, little is known about the spatial and temporal variability of CDW, particularly seasonally. A new data set of 6,704 seal tag temperature and salinity profiles in the easternmost trough between February and December 2014 reveals a CDW layer on average 49dbar thicker in late winter (August to October) than in late summer (February to April), the reverse seasonality of that seen at moorings in the western trough. This layer contains more heat in winter, but on the 27.76 kg/m(3) density surface CDW is 0.32 degrees C warmer in summer than in winter, across the northeastern Amundsen Sea, which may indicate that wintertime shoaling offshelf changes CDW properties onshelf. In Pine Island Bay these seasonal changes on density surfaces are reduced, likely by gyre circulation. Plain Language Summary In the Amundsen Sea, Antarctica, warm salty water crosses the continental shelf from the deep open ocean, toward the vulnerable West Antarctic ice shelves, bringing heat to help melt them from underneath. Due to lack of observations, little is known about how this flow of warm water varies in space and time, particularly seasonally. Between February and December 2014, in a trough in the eastern Amundsen Sea, 6,704 profiles were collected by sensors attached to seals, measuring temperature and salinity as the seals return from dives up to 1,200m deep. These data showed that this warm (similar to 1 degrees C) deep layer is on average similar to 50m thicker in late winter (August to October) than in late summer (February to April), the reverse seasonality of that seen within a trough in the western Amundsen Sea. This warm layer contains more heat in winter but on a surface of constant density is 0.32 degrees C warmer in summer than in winter, across the northeastern Amundsen Sea. This may indicate that in winter the deep waters offshelf rise, allowing different water onto the continental shelf. In Pine Island Bay these seasonal changes on density surfaces are reduced, probably because here the water circulates and mixes. |
英文关键词 | Pine Island Glacier ice melt Circumpolar Deep Water Amundsen Sea |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435262000050 |
WOS关键词 | PINE ISLAND GLACIER ; WEST ANTARCTICA ; ICE-SHELF ; OCEAN ; CIRCULATION ; VARIABILITY ; SENSITIVITY ; EMBAYMENT ; RETREAT ; INFLOW |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26654 |
专题 | 气候变化 |
作者单位 | 1.Univ East Anglia, Ctr Ocean & Atmospher Sci, Norwich, Norfolk, England; 2.Univ St Andrews, Sea Mammal Res Unit, St Andrews, Fife, Scotland; 3.Stockholm Univ, Dept Meteorol, Stockholm, Sweden; 4.Univ Gothenburg, Dept Marine Sci, Gothenburg, Sweden |
推荐引用方式 GB/T 7714 | Mallett, Helen K. W.,Boehme, Lars,Fedak, Mike,et al. Variation in the Distribution and Properties of Circumpolar Deep Water in the Eastern Amundsen Sea, on Seasonal Timescales, Using Seal-Borne Tags[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(10):4982-4990. |
APA | Mallett, Helen K. W.,Boehme, Lars,Fedak, Mike,Heywood, Karen J.,Stevens, David P.,&Roquet, Fabien.(2018).Variation in the Distribution and Properties of Circumpolar Deep Water in the Eastern Amundsen Sea, on Seasonal Timescales, Using Seal-Borne Tags.GEOPHYSICAL RESEARCH LETTERS,45(10),4982-4990. |
MLA | Mallett, Helen K. W.,et al."Variation in the Distribution and Properties of Circumpolar Deep Water in the Eastern Amundsen Sea, on Seasonal Timescales, Using Seal-Borne Tags".GEOPHYSICAL RESEARCH LETTERS 45.10(2018):4982-4990. |
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