Deep convective influence on the Asian summer monsoon anticyclone and associated tracer variability observed with Atmospheric Infrared Sounder (AIRS)
Deep convective influence on the Asian summer monsoon anticyclone and associated tracer variability observed with Atmospheric Infrared Sounder (AIRS)
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DOI：
10.1029/2005jd006490
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发表时间：
2006-06
影响因子：
--
通讯作者：
W. Randel;Mijeong Park
中科院分区：
文献类型：
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作者：
W. Randel;Mijeong Park
[1]亚洲夏季风反气旋与东南亚地区的气候学深对流有关，环流和对流的耦合强烈影响对流层上部-平流层下部（UTLS）的组成行为。这项工作探讨了亚洲季风环流的变化和微量成分与瞬态深对流，动力场和输出长波辐射（OLR）数据的基础上，加上水汽和臭氧反演大气红外探测器（AIRS）仪器。在季风区，瞬变深对流的时间尺度为10-20天，与季风环流的活跃/中断周期有关。我们发现，这些对流事件触发的反气旋本身的变化，与OLR和低位涡（PV）定义的反气旋的区域之间的强相关性。对流增强后，相对较高的平流层空气（PV）也被平流输送到反气旋以东的低纬度地区。AIRS资料表明，瞬变对流事件与低臭氧和高水汽垂直输送到UTLS区有关，对340-360 K（377 -13 km）的位温有显著影响。理想化的运输计算被用来证明，成分异常被限制在对流层上部反气旋，这种限制有助于在夏季观察到的气候组成模式。
[1] The Asian summer monsoon anticyclone is linked to climatological deep convection over Southeast Asia, and the coupling of circulation and convection strongly influences constituent behavior in the upper troposphere – lower stratosphere (UTLS). This work explores the variability of the Asian monsoon circulation and trace constituents linked to transient deep convection, on the basis of dynamical fields and outgoing longwave radiation (OLR) data, plus water vapor and ozone retrievals from the Atmospheric Infrared Sounder (AIRS) instrument. Within the monsoon region, transient deep convection varies with a timescale of ∼10–20 days, linked to active/break cycles in the monsoon circulation. We show that these convective events trigger variations of the anticyclone itself, with strong correlations between OLR and the area of low potential vorticity (PV) defining the anticyclone. Relatively high PV (stratospheric air) is also advected to low latitudes to the east of the anticyclone following enhanced convection. AIRS data show that the transient convective events are associated with the vertical transport of low ozone and high water vapor into the UTLS region, with significant effects over potential temperature levels 340–360 K (∼7–13 km). Idealized transport calculations are used to demonstrate that constituent anomalies are confined within the upper tropospheric anticyclone, and this confinement contributes to the climatological constituent patterns observed during summer.