Oceanography of the Amundsen and Bellingshausen Seas

9418151 Jacobs本项目将处理、分析和报告调查结果 此前资助的对阿蒙森大陆架的首次系统海洋学研究 和 别林斯高晋海， 这 包括温度和盐度剖面、海洋化学用水取样和连续精确水深测量。 上升的温暖深水覆盖了阿蒙森河 关于Bellingshausen 货架和被 发现 到 向海冰和边缘冰架输送大量的热量。 该地区降水量大，历史上一直保持着常年冰盖。 然而，在过去几年中，卫星图像显示，冰已经急剧消退，在早期被冰覆盖的地区，大面积的开放水域持续整个冬季。 这些异常的冰分布很可能伴随着地表水性质的改变，以及深层垂直环流的变化。 有迹象表明，有利于海冰减少的条件可能会向西迁移到罗斯海，并可能影响了近几十年来南极半岛西侧的逐渐wapming。 目前的项目将调查通过与沿海冰穴和浮冰的相互作用产生的陆架水和深水，并利用大量的 身体 关于地球化学、生物和冰冻圈环境的辅助数据。 该项目利用了R/V纳撒尼尔B。 帕尔默在两次巡航中：一次是在1993年至1994年的夏末，另一次是在9月和10月，以观察冬末的情况。 ***

9418151 Jacobs This project will process, analyze, and report the findings of the previously funded first systematic oceanographic study of the continental shelves of the Amundsen and Bellingshausen Seas, which included temperature and salinity profiling, water sampling for ocean chemistry, and continuous precision bathymetry. Upwelling warm deep water covers the Amundsen and Bellingshausen shelves and was found to deliver significant amounts of heat to the sea ice and fringing ice shelves. The regional precipitation is heavy, and has historically maintained a perennial ice cover. However, within the last few years satellite images have shown that the ice has been receding dramatically, with large areas of open water persisting through the winter in sectors that earlier had been ice-covered. These anomalous ice distributions are likely to have been accompanied by altered surface water properties, and possibly changes in the deep vertical circulation. There are indications that the conditions favoring a reduction in the sea ice may migrate westward toward the Ross Sea, and may have influenced a gradual wapming over recent decades on the western side of the Antarctic Peninsula. The current project will investigate the production of shelf water and deep water through interactions with coastal polynyas and floating ice, and make use of a large body of ancillary data on the geochemical, biological, and cryospheric environment. The project made use of the R/V Nathaniel B. Palmer in two cruises: one in the late austral summer 1993-1994, and a subsequent cruise in September and October to observe late winter conditions. ***