Longwave Band-by-band Cloud Radiative Effect and its Application in GCM Evaluation
Longwave Band-by-band Cloud Radiative Effect and its Application in GCM Evaluation
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长波逐波段云辐射效应及其在GCM评价中的应用
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
N. Loeb
中科院分区：
文献类型：
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作者：
Xianglei Huang;J. Cole;F. He;G. Potter;L. Oreopoulos;Dongmin Lee;M. Suárez;N. Loeb
GCM辐射代码中每个长波吸收波段的云辐射效应(CRE)对于GCM的评估是唯一有价值的，这是因为1)逐个波段比较CRE避免了宽带CRE比较中的补偿偏差，2)每个波段对LW宽带CRE(FCRE)的贡献对云顶高度敏感，但对云分数不敏感，从而提供了区分云的两种宏观特性的诊断指标。由第一作者领导的最近的研究已经建立了从配置的大气红外探测仪(AIRS)和云以及地球辐射能量系统(CERES)观测中获得这种逐带量的方法。本文介绍了一项研究，将热带海洋上观测到的逐带CRE与三种不同大气GCM模拟的结果进行了比较。GFDL大气模式版本2(GFDL AM2)，NASA戈达德地球观测系统版本5(GEOS-5)，以及加拿大第四代AGCM。
AbstractThe cloud radiative effect (CRE) of each longwave (LW) absorption band of a GCM’s radiation code is uniquely valuable for GCM evaluation because 1) comparing band-by-band CRE avoids the compensating biases in the broadband CRE comparison and 2) the fractional contribution of each band to the LW broadband CRE (fCRE) is sensitive to cloud-top height but largely insensitive to cloud fraction, thereby presenting a diagnostic metric to separate the two macroscopic properties of clouds. Recent studies led by the first author have established methods to derive such band-by-band quantities from collocated Atmospheric Infrared Sounder (AIRS) and Clouds and the Earth’s Radiant Energy System (CERES) observations. A study is presented here that compares the observed band-by-band CRE over the tropical oceans with those simulated by three different atmospheric GCMs—the GFDL Atmospheric Model version 2 (GFDL AM2), NASA Goddard Earth Observing System version 5 (GEOS-5), and the fourth-generation AGCM of the Canad...