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ISSN 1006-9895

CN 11-1768/O4

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副热带东亚季风区一次穿透性对流过程影响下平流层成分变化的个例分析
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作者单位:

1.中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室;2.中国科学院大学;3.中国科学院气候变化研究中心

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中国科学院“国际伙伴计划-国际大科学计划培育专项”项目(No. 134111KYSB20160031)、国家自然科学基金(41775091)


Impacts of An Overshooting Deep Convection over subtropical Asian Monsoon region on the Lower Stratospheric Atmospheric Composition Distribution
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1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences;2.Climate Change Research center,Chinese Academy of Sciences

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    摘要:

    穿透性对流是导致北半球夏季平流层低层南亚高压内水汽极值形成的重要机制之一,关于副热带东亚季风区穿透性对流是否对平流层低层水汽等物质分布存在影响目前尚不清楚。本文选取2016年的武汉暴雨事件,采用Cloudsat和Aura Microwave Limb Sounder数据,分析了东亚季风区的穿透性对流活动对上对流层/下平流层物质分布的影响。利用CloudSat卫星资料云分类产品和Aura MLS卫星数据联合分析,在武汉暴雨过程中捕捉到1次穿透性对流事件,它发生于7月4日05时的穿透性对流个例B,中心位于海上梅雨带区域。分析表明,这次对流穿透事件对上对流层/下平流层物质分布有显著影响,穿透性对流活动影响到对流层顶以上的物质分布,具体表现是:首先,穿透性对流显著减少了局地对流层顶附近的臭氧含量,较之气候态对流层顶臭氧含量偏少32.53%。其次,穿透性对流能够增加局地对流层顶附近的水汽混合比含量,它通过更多的云冰粒子蒸发来增强局地平流层水汽含量,同时通过更强的垂直水汽输送来直接加湿平流层。穿透性对流事件B对水汽变化影响较之对臭氧含量变化的影响更为显著,它使得对流层顶水汽混合比增加近乎一倍(98.15%)。因此,副热带东亚季风区的穿透性对流活动对于对流层向平流层的物质输送起着重要的作用。

    Abstract:

    The rapid transport by the overshooting deep convection is essential for summertime water vapor maxima in the lower stratosphere over the Asian monsoon region. However, the impacts of overshooting deep convection over subtropical Asian monsoon region on the lower stratospheric atmospheric composition distribution have not been fully addressed. In this study, we investigate the characters of overshooting deep convections during 2016 Wuhan rainstorm by using CloudSat and Aura Microwave Limb Sounder (MLS) satellite data. The concentrations of water vapor (H2O), ice water content (IWC), ozone (O3) in the upper troposphere/lower stratosphere during overshooting deep convections are analyzed. We find one overshooting deep convection case B which occurred at 5:00 a.m. on July 4. The overshooting convection considerably reduces the ozone mixing ratio near the tropopause. For example, it leads to 32.53% decreases of the climatological mean ozone mixing ratio. The overshooting convection is farther found to enhance the moisture at the lower subtropical stratosphere through the hydrating effect which has two different ways: moistening induced by ice particles evaporation and by the convective moisture flux itself. The overshooting convection results in a stronger moisture change (about 98.15% increase of climatology) when compared with ozone change. Our study implies that the local overshooting convections over subtropical Asian Monsoon region in boreal summer are important in transporting water vapor from the troposphere into the low stratosphere.

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历史
  • 收稿日期:2019-04-19
  • 最后修改日期:2020-04-09
  • 录用日期:2020-06-28
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