African Easterly Jet: Structure and Maintenance
African Easterly Jet: Structure and Maintenance
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非洲东风喷气机：结构和维护
DOI：
10.1175/2009jcli2584.1
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发表时间：
2009
影响因子：
4.9
通讯作者：
Pegion
中科院分区：
文献类型：
--
作者：
Man;Li;C.;Wu;Max;J.;Suarez;Randy;D.;Koster;Philip;Pegion
本文研究了非洲东风急流（AEJ）、其结构和维持该急流的强迫，批判性地回顾了以前将该急流的维持归因于热带非洲土壤湿度梯度的工作。在高端计算机框架中使用最先进的全球模式来生成由观测到的海温强迫的三成员73年整体运行，以表示控制运行。对照产生的AEJ与40年ECMWF再分析（ERA-40）和其他观测数据集中的AEJ表示进行了比较，发现非常真实。然后进行了五个实验，每个实验都由三个成员组成的22年（1980-2001）集合运行。实验的目的是研究经向土壤水分梯度、不同的地表性质和地形的作用。与之前的研究不同，这些研究在高度理想化的框架内（即所谓的桶模型）抑制了土壤湿度梯度，……
Abstract This article investigates the African easterly jet (AEJ), its structure, and the forcings contributing to its maintenance, critically revisiting previous work that attributed the maintenance of the jet to soil moisture gradients over tropical Africa. A state-of-the-art global model in a high-end computer framework is used to produce a three-member 73-yr ensemble run forced by observed SST to represent the control run. The AEJ as produced by the control is compared with the representation of the AEJ in the 40-yr ECMWF Re-Analysis (ERA-40) and other observational datasets and found to be very realistic. Five experiments are then performed, each represented by sets of three-member 22-yr-long (1980–2001) ensemble runs. The goal of the experiments is to investigate the role of meridional soil moisture gradients, different land surface properties, and orography. Unlike previous studies, which have suppressed soil moisture gradients within a highly idealized framework (i.e., the so-called bucket model),...