Collaborative Research: Contribution of Prydz Bay Shelf Water to Antarctic Bottom Water Formation

南极底层水（AABW）的形成是形成全球温盐（翻转）环流的关键组成部分。最近的研究推断，由于进入南极大陆周围全球深海盆地的AABW体积减少，AABW成分减少。因此，更好地估计AABW源区的生成速率，并调查全球翻转环流是否正在减缓是很重要的。该项目将继续进行CTD/LADCP调查的现场工作，包括2个年度重复部分、系泊恢复和部署。 还将观察CDW侵入、密集陆架水积累和输出以及Praveniz湾陆架溢出的季节年际变化。 普拉茨湾-埃默里冰架区域被认为是一个关键的AABW生产地点。USAP进入南极大陆的这个偏远地区是具有挑战性的。该项目将涉及丹麦和中国合作在中国研究船“雪龙”号上进行的实地考察。将建立一个高分辨率的区域海洋-海冰耦合模式，以便能够进行时间和空间连续的三维海洋状况估计。现场和遥感观测沿着模拟结果将用于调查（i）当地大气-海洋-海冰相互作用和产生密集陆架水的陆架过程以及（ii）控制陆架水输出的动态过程。

Antarctic Bottom Water (AABW) formation is a key component in setting the global thermohaline (overturning) circulation. Recent studies infer a reduction of the AABW component from reduced volume of AABW entering global deep ocean basins around the Antarctic continent. It is important to obtain better estimates of AABW production rate in its source areas, and to investigate whether the global overturning circulation is slowing-down. The project will continue fieldwork with CTD/LADCP surveys including 2 yearly repeat sections, mooring recoveries and deployments. Seasonal-interannual variability of CDW intrusion, dense shelf water accumulation and export as well as overflow from the Prydz Bay shelf will also be observed. The Prydz Bay- Amery Ice Shelf region has been suggested as a key AABW production site. USAP access to this remote region of the Antarctic continent is challenging. The project will involve fieldwork to be carried out with Danish and Chinese collaboration aboard the Chinese research vessel, Xue Long. A high-resolution regional ocean-sea ice coupled model will be developed to allow time and space continuous three-dimensional ocean state estimation. Both in-situ and remote sensing observations along with the modeling simulation results will be used to investigate(i) the local atmosphere-ocean-sea ice interaction and shelf processes that produce dense shelf water and (ii) the dynamic processes that control the shelf water export.