Collaborative Research: Reconstruction of the eastern Bering ice-ocean system by variational assimilation of the BEST-BSIERP data

提供资金是为了实现三大目标。1.通过建模和数据同化，综合白令海BSIERP最佳协调方案的数据和同一时期(2007-2010年)收集的其他来源的数据。两个联合数据同化系统将用于重建东白令冰-海洋系统的物理海洋场。第一个系统将被配置为重建白令海东部的大尺度环流，并准确描述东南部白令海大陆架的大尺度过程。第二个将被配置为东部白令海陆架，并将明确地解决涡旋和潮汐动力学，从而导致更好地了解深盆地和东部白令海陆架地区之间的非线性相互作用过程。2.分析重建的场，并确定引起观测变化的重要过程。3.确定不同来源的同化资料对估算近地表体积、动量、热量和物质输送的影响。这将通过伴随灵敏度分析来实现。这些结果将有助于在未来的研究中优化白令海系泊观测。白令海是美国最大的商业和自给自足渔业。面对持续的气候变化，对这一渔业的管理需要了解影响渔业的所有过程。其中包括影响鱼类生长速度的水温变化，以及将鱼卵和幼体从产卵区运送到育苗场的水流。该项目将有助于理解这些场如何随着其他外力的变化而变化。

Funds are provided to achieve three major goals. 1. To synthesize data from the BEST-BSIERP coordinated programs in the Bering Sea and data from other sources, collected during the same time period (2007-2010), via modeling and data assimilation. Two joint data assimilation systems will be applied to reconstruct the physical oceanographic fields of the eastern Bering ice-ocean system. The first system will be configured to reconstruct the large-scale circulation in the eastern Bering Sea and to accurately describe the large-scale processes in the South Eastern Bering Sea Shelf. The second will be configured for the eastern Bering Sea Shelf and will explicitly resolve eddy and tidal dynamics, thus leading to a better understanding of the nonlinear interaction processes between the deep basin and the shelf region of the eastern Bering Sea. 2. To analyze the reconstructed fields and identify processes important for causing observed variability. 3. To determine the impact of assimilating data with different origins on the estimation of near-surface transports of volume, momentum, heat, and material. This will be accomplished through adjoint sensitivity analysis. Results will help optimize Bering Sea mooring observations in future studies. The Bering Sea is the largest commercial and subsistence fishery of the United States. Management of this fishery in the face of ongoing climate variability requires an understanding of all the processes impacting the fishery. Amongst these are the changing water temperature, which influences the growth rate of fish, and the current field, which carries fish eggs and larvae from their spawning regions to their nursery grounds. This project will contribute to an understanding of how these fields change in response to other external forcing.