Tropical Wave Driving of the Annual Cycle in Tropical Tropopause Temperatures. Part I: ECMWF Analyses
Tropical Wave Driving of the Annual Cycle in Tropical Tropopause Temperatures. Part I: ECMWF Analyses
复制标题
热带对流层顶温度年周期的热带波驱动。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
W. Norton
中科院分区：
文献类型：
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作者：
A. Kerr;W. Norton
摘要利用ECMWF分析热带对流层顶温度的年周期、热带上升、动量平衡和波驱动进行定量研究，以确定热带对流层顶温度的年周期是如何产生的。结果表明，热带对流层顶温度的年周期是由热带对流层顶上升和动力（绝热）冷却的年变化驱动的。热带对流层顶附近的质量辐散对上升的贡献最大。热带对流层顶附近的质量散度和相关的纬向流的年周期是由Eliassen-Palm（EP）通量散度（即波耗散）驱动的。热带对流层顶附近的EP通量散度主要由定常波控制，EP通量的水平分量和垂直分量都有贡献。而最大的年周期是垂直EP通量的辐散，特别是相对于垂直EP通量的辐散。
Abstract A quantitative examination of the annual cycle in the tropical tropopause temperatures, tropical ascent, momentum balance, and wave driving is performed using ECMWF analyses to determine how the annual cycle in tropical tropopause temperatures arises. Results show that the annual cycle in tropical tropopause temperatures is driven by the annual variation in ascent and consequent dynamical (adiabatic) cooling at the tropical tropopause. Mass divergence local to the tropical tropopause has the dominant contribution to ascent near the tropical tropopause. The annual cycle in mass divergence, and the associated meridional flow, near the tropical tropopause is driven by Eliassen–Palm (EP) flux divergence, that is, wave dissipation. The EP flux divergence near the tropical tropopause is dominated by stationary waves with both the horizontal and vertical components of the EP flux contributing. However, the largest annual cycle is in the divergence of the vertical EP flux and in particular from the contr...