Distribution of tropical cirrus in relation to convection
Distribution of tropical cirrus in relation to convection
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DOI：
10.1029/2001jd001293
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发表时间：
2002-11
影响因子：
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通讯作者：
S. Massie;A. Gettelman;W. Randel;D. Baumgardner
中科院分区：
文献类型：
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作者：
S. Massie;A. Gettelman;W. Randel;D. Baumgardner
[1]卤素掩星实验（HALOE）的气溶胶消光和气候诊断中心（CDC）的传出长波辐射（OLR）数据的每日值被用来量化的统计和地理关系的纤细卷云OLR附近的赤道对流层顶的压力水平。每日深对流的位置确定的CDC OLR数据的分析。HALOE和CDC数据的分析表明，卷云灭绝是大的深对流比清晰的地区的3倍。然而，深对流只占赤道地区的7%。在对流层顶附近，百分之九十的卷云位于深对流区之外。卷云中的等效H2O量的估计值通过应用从消光到体积密度的变换来计算。在HALOE 2 km垂直视场上平均，卷云中的当量H2O的量为0.1-0.2 ppmv，这是当地气相H2O的2%至5%。计算了1995-2000年对流层顶附近的5天后向轨迹。在海洋大陆上空观测到的一半HALOE卷云与对流吹离形成一致，而另一半则与原位形成过程一致。
[1] Daily values of Halogen Occultation Experiment (HALOE) aerosol extinction and Climate Diagnostics Center (CDC) outgoing longwave radiation (OLR) data are used to quantify the statistical and geographical relationships of tenuous cirrus to OLR for pressure levels near the equatorial tropopause. Daily locations of deep convection are identified by analysis of the CDC OLR data. Analysis of the HALOE and CDC data demonstrates that cirrus extinction is larger over deep convection than over clearer regions by a factor of 3. Deep convection, however, occupies only 7% of the equatorial region. Ninety percent of the cirrus clouds near the tropopause are located outside of regions of deep convection. Estimates of the equivalent H2O amount in the cirrus are calculated by applying transformations from extinction to volume density. Averaged over the HALOE 2 km vertical field of view, the amount of equivalent H2O in cirrus is 0.1–0.2 ppmv, which is 2 to 5% of the local gas phase H2O. Five-day back trajectories near the tropopause are calculated for 1995–2000. Half of the HALOE cirrus observations over the maritime continent are consistent with formation by convective blow-off, while the other half are consistent with in situ formation processes.