Spectral retrieval of latent heating profiles from TRMM PR data: comparisons of lookup tables from two- and three-dimensional simulations
Spectral retrieval of latent heating profiles from TRMM PR data: comparisons of lookup tables from two- and three-dimensional simulations
复制标题
从 TRMM PR 数据中进行潜热分布的光谱检索：二维和三维模拟查找表的比较
DOI：
10.1117/12.804768
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Tristan L’Ecuyer
中科院分区：
文献类型：
--
作者：
S. Shige;Yukari N. Takayabu;S. Kida;Wei;Xiping Zeng;Tristan L’Ecuyer
发展了光谱潜热(SLH)算法来估算TRMM PR的潜热廓线。该方法使用PR信息(降水顶部高度、地表和融化水平的降雨率以及降雨类型)从查找表中选择供热剖面。从热带海洋全球大气(TOGA)海-气耦合响应试验(COARE)中利用云分辨模式(CRM)对热带云系进行了数值模拟，得到了三种降雨类型-对流、浅层状和顶雨(深层状和融化层)的查找表。以前的研究使用的是二维(2D)客户关系管理。计算机能力的可获得性呈指数级增长，这使得针对多天时间段的三维(3D)CRM模拟变得越来越普遍。在这项研究中，我们比较了2D和3D模拟的查找表。从三维模拟的查找表可以看出，南方中国海风实验的SLH反演加热模式与探空加热模式之间的一致性较差。SLH估计的最大加热水平低于探空估计的最大加热水平。这是因为3D查找表比2D查找表在熔化水平上产生更强的对流加热和更弱的层状加热的事实。在对流区中产生和携带的凝析油在3D比2D大，而由层状区自身向上运动产生的3D比2D小。
The Spectral Latent Heating (SLH) algorithm was developed to estimate latent heating profiles for the TRMM PR. The method uses PR information (precipitation top height, precipitation rates at the surface and melting level, and rain type) to select heating profiles from lookup tables. Lookup tables for the three rain types-convective, shallow stratiform, and anvil rain (deep stratiform with a melting level)-were derived from numerical simulations of tropical cloud systems from the Tropical Ocean Global Atmosphere (TOGA) Coupled Ocean-Atmosphere Response Experiment (COARE) utilizing a cloud-resolving model (CRM). The two-dimensional ("2D") CRM was used in the previous studies. The availability of exponentially increasing computer capabilities has resulted in three-dimensional ("3D") CRM simulations for multiday periods becoming increasing prevalent. In this study, we compare lookup tables from the 2D and 3D simulations. The lookup table from 3D simulations results in less agreement between the SLH-retrieved heating and sounding-based one for the South China Sea Monsoon Experiment (SCSMEX). The level of SLH-estimated maximum heating is lower than that of the sounding-derived one. This is explained by the fact that the 3D lookup table produces stronger convective heating and weaker stratiform heating above the melting level that 2D counterpart. Condensate generated in and carried over from the convective region is larger in 3D than in 2D, and condensate that is produced by the stratiform region's own upward motion is smaller in 3D than 2D.