邓琪,赵平,温之平,王慧美,王迎春. 2022. 前期青藏高原积雪与ENSO对南海夏季风强度的协同影响[J]. 气象学报, (0):-, doi:10.11676/qxxb2022.026
前期青藏高原积雪与ENSO对南海夏季风强度的协同影响
Synergistic effects of the Tibetan Plateau snow and ENSO as preceding signals on the intensity of South China Sea summer monsoon
投稿时间:2021-12-13  修订日期:2022-02-22
DOI:10.11676/qxxb2022.026
中文关键词:  南海夏季风,青藏高原积雪,ENSO,协同影响
英文关键词:South China Sea summer monsoon, Tibetan Plateau snow, ENSO, Synergistic influence
基金项目:中国科学院A类战略性先导科技专项“泛第三极环境变化与绿色丝绸之路建设”(XDA20000000)和第二次青藏高原综合科学考察研究“亚洲水塔动态变化与影响”(2019QZKK020803)
作者单位邮编
邓琪 复旦大学大气与海洋科学系/大气科学研究院中国气象科学研究院 100081
赵平 中国气象科学研究院 100081
温之平 复旦大学大气与海洋科学系/大气科学研究院 200438
王慧美 中国气象科学研究院 100081
王迎春 北京市气象局 100089
摘要点击次数: 104
全文下载次数: 61
中文摘要:
      基于1980-2018年罗格斯大学全球积雪实验室积雪面积、英国气象局哈德莱中心海温、欧洲中期天气预报中心(ECMWF)第五代再分析(ERA-5)土壤湿度、美国气象环境预报中心和美国国家大气研究中心(NCEP/NCAR)再分析、美国国家海洋大气管理局(NOAA)气候预测中心降水(CMAP)和全球降水气候计划降水(GPCP)等数据,采用相关、合成和回归分析方法,分析了前期青藏高原积雪和ENSO年际尺度变化对南海夏季风强度及降水的协同影响。结果表明:在年际尺度上,青藏高原积雪、ENSO都与南海夏季风变率有密切关系,当青藏高原春季积雪西部偏多东部偏少时,夏季高原西部对流层温度偏低,在高原上空产生异常下沉气流并向外辐散,引起南海地区对流层中低层为异常下沉气流。另外,赤道中东太平洋海温异常偏高则会使夏季印度洋海温异常偏高,对流层温度偏高,在西北太平洋产生东北风异常,加强了西北太平洋和南海上空的反气旋性环流异常。在青藏高原积雪和ENSO共同影响下,夏季850 hPa南海上空反气旋异常进一步加强,南海夏季风强度减弱,降水减少。
英文摘要:
      Based on the Rutgers University Global Snow Lab snow cover,the British Meteorological Office Hadley Center sea surface temperature(SST),soil moisture of the European Centre for Medium-Range Weather Forecasts Fifth Generation Reanalysis(ERA-5), the National Centers for Environmental Prediction National Center for Atmospheric Research reanalysis,the National Oceanic and Atmospheric Administration(NOAA)Climate Prediction Center Merged analysis of Precipitation(CMAP)and the Global Precipitation Climatology Project(GPCP)precipitation,the effects of the Tibetan Plateau(TP)snow and ENSO as preceding signals on the South China Sea(SCS)summer monsoon and precipitation are analyzed by correlation,composite,and regress analyses. The results reveal that the SCS summer monsoon is respectively associated with the TP snow and ENSO on the interannual scale. When the TP snow is more in the west and less in the east in spring,the tropospheric temperature in the west of the TP is abnormally low in summer,which generates downdraft over the plateau and radiates outward. Accordingly,there is also sinking airflow over the South China Sea in lower and middle troposphere. In addition,anomalously high SSTs in the east-central equatorial Pacific may cause high SST and tropospheric temperature anomalies in the Indian Ocean with northeasterly wind anomalies over the northwest Pacific Ocean,which strengthens anticyclonic circulation anomalies over the South China Sea. When the TP snow and ENSO are synergistic,their influences on the SCS summer monsoon are stronger. Their combined effect further strengthens the lower-tropospheric anticyclonic anomalies over the South China Sea in summer,weakens SCS summer monsoon,and decreases precipitation in the South China Sea.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮