Convective Impact on Temperatures Observed near the Tropical Tropopause
Convective Impact on Temperatures Observed near the Tropical Tropopause
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DOI：
10.1175/1520-0469(2003)060
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发表时间：
2003-08
影响因子：
3.1
通讯作者：
S. Sherwood;T. Horinouchi;Heidi A. Zeleznik
中科院分区：
文献类型：
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作者：
S. Sherwood;T. Horinouchi;Heidi A. Zeleznik
摘要热带对流层顶附近观测到的温度趋势和年际变化表明，冷点以下的温度受对流层控制，但有些模式却表明并非如此。在这里，以前的调查与热带对流爆发的热力异常和加热廓线的扩展，通过检查对流层顶附近的行为。观测结果表明，对流活动系统与对流层高层的暖异常和对流层低层及对流层顶附近的冷异常有局地联系。拉普拉斯方程的时间相关的解决方案表明，冷异常低于100百帕，至少可以部分地占绝热放样与瞬态加热脉冲在较低的水平。然而，对数据中冷点对流层顶的详细检查表明，它与放样相反，向下朝着更高的压力和更冷的潜在温度移动，以响应对流。这些变化质量…
Abstract Observed temperature trends and interannual variations near the tropical tropopause suggest that temperatures up to the cold point are controlled by the troposphere, but some models indicate otherwise. Here, previous investigations of thermal anomalies and heating profiles associated with tropical convective outbreak are extended, by examining behavior near the tropopause. Observations show that active convective systems are locally associated with warm anomalies in the upper troposphere but cold anomalies in the lower troposphere and near the tropopause. Time-dependent solutions of Laplace's equations demonstrate that the cold anomaly below 100 hPa can be, at least partly, accounted for by adiabatic lofting associated with a transient heating pulse at lower levels. However, detailed examination of the cold-point tropopause in the data reveals that it moves against the lofting, downward toward higher pressure and colder potential temperatures, in response to convection. These variations qualitati...