Collaborative Research: WinDSSOcK: Winter Distribution and Success of Southern Ocean Krill

合作研究：WinDSSOcK：南大洋磷虾的冬季分布和成功

基本信息

批准号：
9910093
负责人：
Thomas Powell
金额：
$ 22.77万
依托单位：
University of California-Berkeley
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2000
资助国家：
美国
起止时间：
2000-09-15 至 2001-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9910093&HistoricalAwards=false
关键词：
Collaborative Research WinDSSOcK Winter Distribution

项目摘要

This project is a contribution to a coordinated attempt to understand the interactions of biological and physical dynamics by developing relationships among the evolution of the antarctic winter ice and snow cover, biological habitat variability, and the seasonal progression of marine ecological processes. The work will be carried out in the context of the Southern Ocean Experiment of the Global Ocean Ecosystem Dynamics Study (Globec), a large, multi-investigator study of the winter survival strategy of krill under the antarctic sea ice in the vicinity of Marguerite Bay on the western side of the Antarctic Peninsula.The objective of this project is to make a quantitative assessment of the small scale temperature and salinity structure of the oceanic surface layer in order to study the effect of stratification and turbulence on the biochemical and biological processes under the winter sea ice.The water masses on the continental shelf off Marguerite Bay consist of inflowing Upper Circumpolar Deep Water, which is relatively warm, salty, oxygen-poor, and nutrient-rich. In winter atmospheric processes cool and freshen this water, and recharge it with oxygen to produce Antarctic Surface Water which is diffused seaward, and supports both a sea ice cover and a productive krill-based food web. The modification processes work through mixing associated with shear instabilities of the internal wave field, double diffusion of salt and heat, and mixing driven by surface stress and convection. These processes will be quantified with two microstructure profilers, capable of resolving the small but crucial vertical variations that drive these processes.***

该项目是通过在南极冬季冰和雪覆盖，生物栖息地变异性以及海洋生态过程的季节性进步之间发展的关系来理解生物和物理动态相互作用的协调尝试的贡献。这项工作将在全球海洋生态系统动力学研究（Globec）的南方海洋实验的背景下进行，这是一项大型的，一项对玛格丽特湾（Marguerite Bay）南极海冰冬季生存策略的多种评估研究，在玛格丽特湾（Marguerite Bay分层和湍流对冬季冰下生化和生物学过程的影响。玛格丽特湾（Marguerite Bay）大陆架子上的水质量包括流入的上圆形深水，该水相对温暖，咸，氧气贫困和富含营养。在冬季，大气过程使水冷却并清新，并用氧气为其充电以产生散射向海的南极地表水，并支持海冰盖和富有成效的基于磷虾的食物网。修饰过程通过与内波场的剪切不稳定性相关的混合，盐和热量的双重扩散以及由表面应力和对流驱动的混合。这些过程将用两个微观结构探查仪进行量化，能够解决驱动这些过程的较小但至关重要的垂直变化。***