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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.***

该项目是一个协调的尝试，了解生物和物理动力学的相互作用，通过发展南极冬季冰雪覆盖，生物栖息地的变化，海洋生态过程的季节性进展之间的关系。这项工作将在全球海洋生态系统动力学研究的南大洋实验范围内进行，多的，多的南极半岛西侧玛格丽特湾附近南极海冰下磷虾冬季生存策略的调查研究。该项目的目的是对南极半岛附近南极海冰的小尺度温度和盐度结构进行定量评估。为了研究冬季海冰下的层结和湍流对生物化学过程的影响，我们对Marguerite湾外大陆架的水团进行了研究，这些水团由流入的上绕极深水组成，相对温暖、咸、贫氧和富营养。在冬季，大气过程冷却和清新这些水，并为其补充氧气以产生南极地表水，这些地表水向海洋扩散，并支持海冰覆盖和以磷虾为基础的多产食物网。改性过程通过与内部波场的剪切不稳定性相关的混合、盐和热的双扩散以及由表面应力和对流驱动的混合来起作用。这些过程将通过两个微观结构分析仪进行量化，能够解决驱动这些过程的微小但关键的垂直变化。