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Effects of eddy variability on the response of the ACC to global warming (R'Eddy)

涡流变化对 ACC 对全球变暖响应的影响 (REddy)

基本信息

批准号：
168090618
负责人：
Professor Dr. Claus Böning
金额：
--
依托单位：
Akademie der Wissenschaften in Hamburg
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/168090618?language=en
关键词：
Effects eddy variability response ACC

项目摘要

Observations show a significant intensification of the Southern Hemisphere Westerlies over the past decades. A continuation of this trend is projected by climate models for the 21st century if greenhouse gas emissions continue to grow. The dynamic response of the Antarctic Circumpolar Current (ACC) to the atmospheric forcing depends on an intricate balance between wind-driven (Ekman) transports, eddy-induced transports, and changes in the meridional density contrast due to concomitant anomalies in the buoyancy fluxes. Climate model studies generally show a progressive increase in the ACC transport as well as in its meridional overturning circulation, behaviour of critical importance for the carbon dioxide uptake in the Southern Ocean. This picture is under debate, because the Ekman effect is thought to be opposed by wind-induced increases in eddy fluxes, an effect that may not be captured in current eddy transport parameterizations. The aim of this project is to examine the impact of explicitly resolved eddies on the Southern Ocean’s response to global warming by conducting a sequence of global climate model simulations with successively increased resolutions (up to 1/12° to 1/15°) in the ACC regime of the ocean component. The results of the high-resolution experiments will provide a benchmark for the reliability of eddy parameterization schemes in non-eddy resolving climate and carbon cycle models.

观测显示，过去几十年来南半球西风带显着增强。如果温室气体排放量继续增长，21 世纪的气候模型预计这一趋势将持续下去。南极绕极流 (ACC) 对大气强迫的动态响应取决于风驱动 (Ekman) 输送、涡流引起的输送以及由于浮力通量异常引起的经向密度对比变化之间的复杂平衡。气候模型研究普遍表明ACC输送及其经向翻转环流逐渐增加，这种行为对于南大洋二氧化碳的吸收至关重要。这张图片存在争议，因为埃克曼效应被认为与风引起的涡流增加相反，这种效应在当前的涡流传输参数化中可能无法捕获。该项目的目的是通过在海洋部分的 ACC 区域中进行一系列分辨率逐渐提高（高达 1/12° 至 1/15°）的全球气候模型模拟，研究明确解析的涡流对南大洋对全球变暖的响应的影响。高分辨率实验的结果将为非涡旋解析气候和碳循环模型中涡旋参数化方案的可靠性提供基准。