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

观测结果显示，在过去几十年中，南半球西风带显著增强。气候模型预测，如果温室气体排放继续增长，21世纪的这种趋势将继续下去。南极绕极流（ACC）对大气强迫的动态响应取决于风驱动（Ekman）运输，涡诱导运输和浮力通量伴随异常引起的纬向密度对比度变化之间的复杂平衡。气候模式研究一般表明，ACC运输及其纬向翻转环流逐渐增加，这对南大洋的二氧化碳吸收至关重要。这张照片是有争议的，因为埃克曼效应被认为是反对风引起的涡流通量的增加，在目前的涡流传输参数化的效果可能不会被捕获。该项目的目的是通过在海洋部分的ACC制度中进行一系列分辨率不断提高（高达1/12°至1/15°）的全球气候模式模拟，研究明确分辨的涡旋对南大洋对全球变暖的反应的影响。高分辨率试验的结果将为非涡动分辨率气候和碳循环模式中涡动参数化方案的可靠性提供基准。

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.