Atmospheric Overturning across Multiple Scales of an MJO Event during the CINDY/DYNAMO Campaign
Atmospheric Overturning across Multiple Scales of an MJO Event during the CINDY/DYNAMO Campaign
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DOI：
10.1175/jas-d-17-0060.1
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发表时间：
2017-11
影响因子：
3.1
通讯作者：
Xingchao Chen;O. Pauluis;Fuqing Zhang
中科院分区：
文献类型：
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作者：
Xingchao Chen;O. Pauluis;Fuqing Zhang
AbstractThis study investigated the atmospheric overflowing of October 2011 MJO event observed during the Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011（CINDY）/CINDO field experiment using a cloud permissive numerical model.采用等熵分析方法，根据气团的等效位温对垂直质量输送进行排序，将大气翻转自然分解为高熵上升气流和低熵下沉气流。环流进一步分解为四个主要尺度的贡献：全流域上升，纬向翻转，区域翻转，对流。结果表明，对流尺度占主导地位的向上的质量输送，而较大的尺度起着重要的作用，既允许更深的翻转和调制对流活动。在这次MJO事件的不同阶段，大气翻转有很大的变化。对流活动增强...
AbstractThis study investigates the atmospheric overturning of the October 2011 MJO event observed during the Cooperative Indian Ocean Experiment on Intraseasonal Variability in the Year 2011 (CINDY)/DYNAMO field experiment using a cloud-permitting numerical model. The isentropic analysis is used to sort the vertical mass transport in terms of the equivalent potential temperature of the air parcels, which naturally decomposes the atmospheric overturning between ascending air with high entropy and subsiding air with low entropy. The circulation is further decomposed into contributions of four main scales: basinwide ascent, meridional overturning, regional overturning, and convection. Results show that the convective scale dominates the upward mass transport while larger scales play an important role both by allowing a deeper overturning and by modulating convective activity. There are substantial changes in the atmospheric overturning during different phases of this MJO event. Increased convective activity...