The role of heat fluxes and moist static energy in tropical convergence zones
The role of heat fluxes and moist static energy in tropical convergence zones
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DOI：
10.1175/1520-0493(1996)124
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发表时间：
1996-10
影响因子：
3.2
通讯作者：
J. Srinivasan;G. Smith
中科院分区：
文献类型：
--
作者：
J. Srinivasan;G. Smith
月平均长波辐射（OLR）与对流层低层平均湿静力能的关系与海洋区月平均OLR与海表温度的关系相似。月平均OLR与地面湿静力能的关系表明，对流爆发的阈值在大陆和海洋区域是不同的。然而，对流层（表面到400 mb）的湿静稳定度阈值对于海洋和大陆是相同的。这种关系与Neelin和Held提出的热带辐合带的简单模型是一致的。对流层的净能量辐合在OLR低于210 W $m^{-2}$的区域为正值。这一结果与Neelin和Held关于热带辐合区存在的必要而非充分条件是对流层正能量辐合的假设是一致的。
The relationship between monthly mean outgoing longwave radiation (OLR) and the mean moist static energy of the lower troposphere is shown to be similar to the relationship between monthly mean OLR and sea surface temperature over the oceanic regions. The relationship between monthly mean OLR and surface moist static energy shows that the threshold value for the onset of convection is different in continental and oceanic regions. However, the threshold of moist static stability for the troposphere (surface to 400 mb) is the same for oceans and continents. This relationship is consistent with the simple model of the tropical convergence zones proposed by Neelin and Held. The net energy convergence in the troposphere was found to be positive in regions with OLR below 210 W $m^{-2}$. This result is consistent with the Neelin and Held hypothesis that the necessary but not sufficient condition for the existence of tropical convergence zone is a positive energy convergence in the troposphere.