报告题目：Elephant Seals as Polar Ocean Explorers – Uncovering new sources of dense shelf water formation for Antarctic Bottom Water production and more
报告人：Guy Williams 博士（澳大利亚塔斯玛尼亚大学海洋与南极研究中心）
时间：2013年9月5日（周四）上午9:00-10:30
地点：海洋科学学院A323会议室
报告内容简介：
Elephant Seals as Polar Ocean Explorers – Uncovering new sources of dense shelf water formation for Antarctic Bottom Water production and more
New oceanographic datasets from instrumented marine mammals have been addressing critical spatial and temporal gaps in our understanding of the polar oceans. This is particularly true south of the Antarctic continental shelf break in the coastal polynya regions that form dense shelf water for the production of Antarctic Bottom Water (AABW). In 2011, IMOS instrumented southern elephant seals (Mirounga leonina) from Davis Station and Kerguelen Island foraged extensively over the Prydz Bay/Cape Darnley region (65-80ºE) from February to October. Historically this eastern sector of the Weddell-Enderby Basin was identified from offshore bottom properties as having a local source of AABW. The dense shelf water source was speculated to be Prydz Bay, but never confirmed. Recent satellite analyses found that the Cape Darnley polynya, directly west of Prydz Bay, had the 2nd highest sea ice production around Antarctica. A subsequent Japanese IPY mooring program in 2008 revealed the first direct observations of new AABW production offshore from Cape Darnley, but could not sample the shelf region due to logistic constraints. The elephant seals deployed in 2011 have not only confirmed the presence of very High Salinity Shelf water west of Cape Darnley (up to 34.9), relative to dense shelf water from the Prydz Bay region, but have also captured very rare wintertime observations of the modified shelf water overflows to depths of ~1700m in wintertime. This talk will present these results, plus additional data from 2012 and 2013 and showcase other unique insights the IMOS seals are delivering on the East Antarctic margin of the southern ocean.
报告人简介：
Dr Guy Williams is a polar climate specialist with 14 years experience in observational studies of ocean/sea ice interactions around the East Antarctic margin. After completing a bachelor of Aeronautical Engineering from University of Sydney, Dr Williams transferred his knowledge of fluid dynamics and computing to receive first class honours (masters) modelling the dynamic response of Heard Island Glaciers to climate change at the University of Tasmania. Thereafter Dr Williams completed his PhD in physical oceanography on the production of Adélie Land Bottom Water. Dr Williams began his post-doctoral research on physical-biological interactions in the ocean mixed layer at the Antarctic Climate and Ecosystem CRC in Tasmania, then moved overseas to complete further work on Antarctic Bottom Water production at the Institute of Low Temperature Science in Japan and LOCEAN in France. He has now returned to Tasmania and is working as an AUV/Sea Ice specialist, maintaining a broad interest in all aspects of Antarctic marine science.
（国际海洋研究中心）