Understanding Two-way Coupling Between Cloud Radiative Effects and the Large-Scale Extratropical Atmospheric Circulation

本研究的目的是提高对温带高纬度地区云与大尺度大气环流之间双向耦合的认识。这项工作包括两个部分。第一个分量将分析大尺度温带气候变率对云和云辐射效应的影响。这项研究将包括对气候模式输出和观测结果的分析，包括各种CloudSat产品、多种再分析产品和大气云辐射效应的遥感估计。这些分析将探讨和解释与一系列温带变率型态变化有关的垂直云结构和辐射加热率的变化。在第二部分，将研究大尺度温带环流对大气云辐射效应的响应。在此过程中，将探讨大气云辐射效应对大尺度温带大气变率型的结构、振幅和时间尺度的影响。这些分析将利用Klima云开/关互比实验（COOKIE）的输出，其中包括在有和没有大气云辐射效应的情况下进行的数值模拟。它们还将包括在模拟大气云辐射效应的加热强迫的一般环流模式的干动力核心上进行的数值实验。

The goal of the proposed research is to improve understanding of the two-way coupling between clouds and the large-scale atmospheric circulation at extratropical latitudes. The work includes two components. In the first component, the influence of largescale extratropical climate variability on clouds and cloud radiative effects will be analyzed. The research will include analyses of both climate model output and observations, including various CloudSat products, multiple reanalyses products, and remotely sensed estimates of atmospheric cloud radiative effects. The analyses will explore and interpret the changes in vertical cloud structure and radiative heating rates associated with variations in a range of patterns of extratropical variability.In the second component, the response of the large-scale extratropical circulationto atmospheric cloud radiative effects will be examined. In the process, the impact of atmospheric cloud radiative effects on the structure, amplitude, and timescale of patterns of large-scale extratropical atmospheric variability will be explored. The analyses will exploit output from the Clouds On/Off Klima Intercomparsion Experiments (COOKIE), which include numerical simulations run with and without atmospheric cloud radiative effects. They will also include numerical experiments run on the dry dynamical core of a general circulation model forced with heatings that mimic atmospheric cloud radiative effects.