摘要
利用欧洲中期天气预报中心(ECMWF)提供的1979-2016年ERA-Interim再分析资料分析了青藏高原(下称高原)夏季云水含量及其水汽输送情况。结果表明:高原夏季云水含量占全年48%,东南向西北减少。影响高原云水含量的水汽通道有印度洋通道、南海通道、孟加拉湾北部及伊朗西部通道(依次简称通道1、2、3、4)。高原云水含量和各水汽通道强度均有明显年际变化。云水含量年际变化与通道2,4基本一致。云水含量与各水汽通道强度均呈增加趋势。通道1偏强时,来自印度洋北部和南海的异常水汽在孟加拉湾交汇向高原输送,主要使高原西北部云水含量增多。通道2偏强时,南海、中南半岛的异常偏南通量及孟加拉湾北部的异常西南通量向高原东南部输送更多水汽。通道3偏强时,西风带水汽和来自印度洋水汽更多输送到高原,主要使高原东北部云水含量偏多。通道4偏强时,来自南海-孟加拉湾南部的水汽向高原异常输送,使高原中部、东南部云水含量偏多。此外,西太平洋副热带高压(下称副高)偏西南偏强时,水汽通道2、4强度偏强,有利于水汽向高原输送。
Based on the ERA-Interim reanalysis data from 1979 to 2016 provided by the European Center for Medium- range Weather Forecast (ECMWF), the cloud water content and its water vapor transport over the Qinghai- Tibetan Plateau (QTP) in summer is analyzed. The results show that the summer cloud water content over the QTP accounts for 48% of the total year, which decreases from southeast to northwest. There are four water vapor channels affecting the cloud water content, which are the Indian Ocean channel, the South China Sea channel, the northern Bay of Bengal and the western Iranian channel (briefly called channel 1, 2, 3, 4 in order), respectively. There are obvious interannual variations of cloud water content and water vapor channel intensities. The interannual variation of cloud water content is in consistent with that of channel 2 and 4. It is shown that both the cloud water content and four channel intensities have increased trends. When the intensity of channel 1 is strong, abnormal water vapor from the northern part of the Indian Ocean and the South China Sea will convergent over the Bay of Bengal and be transported to the QTP , which mainly increases the cloud water content in the northwestern part of the QTP . When the intensity of channel 2 is strong, the anomalous southward flux over the South China Sea and the Indo-China Peninsula and the anomalous southwest flux over the northern Bay of Bengal support more water vapor to the southeastern QTP . The stronger channel 3 intensity indicates more water vapor from westerly and Indian Ocean are transported to the QTP , resulting more cloud water content in the northeastern QTP . When the intensity of channel 4 is strong, the water vapor from the South China Sea to the southern part of the Bay of Bengal is abnormally transported to the QTP , resulting more cloud water content in the central and southeastern TP . In addition, the stronger and southwestward of northwest Pacific subtropical high is consistent with stronger identities of channel 2 and 4, which is co
作者
刘菊菊
游庆龙
王楠
LIU Juju;YOU Qinglong;WANG Nan(Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/ Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology (NUIST), Nanjing 210044, Jiangsu, China;Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China)
出处
《高原气象》
CSCD
北大核心
2019年第3期449-459,共11页
Plateau Meteorology
基金
国家重点研发计划项目(2016YFA0601702)
国家自然科学基金项目(41771069)
江苏高校优势学科建设工程资助项目(PAPD)
关键词
青藏高原
云水含量
水汽输送
水汽通道
Qinghai-Tibetan Plateau (QTP)
cloud water content
water vapor transport
water vapor channels
