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

南极底层水(AABW)的形成是全球温盐(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数量减少，AABW的组成部分减少。重要的是对其源头地区的AABW生产量进行更好的估计，并调查全球翻转的环流是否正在放缓。该项目将继续进行CTD/LADCP调查的实地工作，包括两年一次的重复调查、系泊恢复和部署。还将观察到CDW入侵、密集陆架水积累和输出以及来自普里兹湾陆架的溢出的季节-年际变化。普里兹湾-阿莫里冰架地区已被建议作为主要的AABW生产基地。USAP要进入南极大陆的这一偏远地区是具有挑战性的。该项目将与丹麦和中国合作，在中国科考船雪龙号上进行实地工作。将开发一个高分辨率的区域海-海冰耦合模式，以实现时间和空间上连续的三维海洋状态估计。将利用现场观测和遥感观测以及模拟模拟结果来研究(I)产生密集陆架水的当地大气-海洋-海冰相互作用和陆架过程，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.