Negative sea ice-circulation feedback along Arctic marginal ice zones

北极边缘冰区的海冰环流负反馈

• 批准号: 1022485
• 负责人: Courtenay Strong
• 金额: $ 24.3万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1022485&HistoricalAwards=false
• 关键词: Negative; sea; ice; circulation; feedback

It is increasingly important to understand how sea ice interacts with the overlying atmospheric circulation. Funds are proided to investigate a negative feedback process over and around the Arctic marginal ice zone (MIZ) involving variability in sea ice, surface heat flux, and surface wind stress. In this negative feedback process, sea ice anomalies in the MIZ are hypothesized to generate local wind patterns that act to counter the initial sea ice anomalies, providing a regulatory mechanism on the retreat and advance of the MIZ on weekly time scales.This work will quantify the MIZ local negative feedback process and determine its effects under contemporary and projected sea ice conditions. A detailed three-year study in observations and modeling environments will realize the following research objectives: 1) determine and map the response of surface wind stress to sea ice extent anomalies in the MIZ, 2) determine and map the sea ice response to wind stress anomalies generated by local sea ice anomalies, 3) evaluate the statistical significance of the sea ice-wind stress negative feedback in observations and coupled simulations, and 4) determine the effects of the feedback by turning it on and off in a coupled model. This project will provide research support for a new, young investigator, as well as support for the additional training of a female graduate student and an undergraduate student. The project also includes outreach to k-12 students.

了解海冰如何与上覆大气环流相互作用变得越来越重要。为研究北极边缘冰带（MIZ）上空及其周围的负反馈过程提供了资金，该过程涉及海冰、地表热通量和地表风应力的变异性。在这个负反馈过程中，假设MIZ的海冰异常会产生局部风型，这些风型会抵消最初的海冰异常，从而在每周的时间尺度上为MIZ的后退和前进提供一种调节机制。这项工作将量化MIZ当地的负反馈过程，并确定其在当前和预测的海冰条件下的影响。对观测和模拟环境进行为期三年的详细研究，将实现以下研究目标：1)确定和绘制MIZ区域地面风应力对海冰范围异常的响应图；2)确定和绘制海冰对局部海冰异常产生的风应力异常的响应图；3)评估观测和耦合模拟中海冰-风应力负反馈的统计显著性；4)在耦合模型中通过打开和关闭反馈来确定反馈的影响。该项目将为一名新的年轻研究员提供研究支持，并为一名女研究生和一名本科生的额外培训提供支持。该项目还包括向k-12学生提供服务。