Tropical Tropopause Transition Layer Cirrus as Represented by CALIPSO Lidar Observations
Tropical Tropopause Transition Layer Cirrus as Represented by CALIPSO Lidar Observations
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CALIPSO 激光雷达观测代表的热带对流层顶过渡层卷云
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. Ackerman
中科院分区：
文献类型：
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作者：
K. Virts;J. Wallace;Q. Fu;T. Ackerman
根据云-气溶胶激光雷达和红外探路器卫星观测任务三年的数据，结合欧洲中期天气预报再分析中心的场--来自巴布亚新几内亚马努斯岛发射的无线电探空仪(28S，1478E)的临时和温度廓线，分析了热带对流层顶过渡层(TTL)内卷云部分的空间和时间变异性。TTL卷云主要分布在赤道158公里的哈德利环流上升支上，最大云量在14~15公里之间。该带内云量随时间变化的空间分布与下层云量的变化不同，如果TTL环流是由对流云的尖峰扩散形成的，则是可以预料的。相反，在距地面13公里的稳定层结层内，卷云比例和温度似乎都受到行星尺度垂直速度场的调制。具有最冷、最多云空气的时变空间型arereminiscentofthevertical-propagatingKelvinwaveresponsetoanequatorialheatsource，的中心大约位于最强加热东经308度处。
The spatial and temporal variability of cirrus cloud fraction within the tropical tropopause transition layer (TTL) is investigated based on three years of data from the Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission, analyzed in conjunction with fields from the European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA)-Interim and temperature profiles from radiosondes launched at Manus Island, Papua New Guinea (28S, 1478E). TTL cirrus is found to be mainly confined to the rising branch of the Hadley cell within ;158 of the equator, with maximum cloud fraction between 14 and 15 km. The time-varying spatial pattern ofcloud fraction within this beltdoesnot resemble the pattern of cloud fractionin the layer below, aswould be expected ifthe TTL cirruswere formed bythe spreading ofthe anvils of convective clouds. On the contrary, within the stably stratified layer above ;13 km, cirrus cloud fraction and temperaturebothappear tobemodulatedbytheplanetary-scalevertical velocityfield. Thetime-varyingspatial patterns arereminiscentofthevertical-propagatingKelvinwaveresponsetoanequatorialheatsource,withthe coldest, cloudiest air in the TTL centered approximately 308 of longitude to the east of the strongest heating.