Effect of the Barents Sea ice in March on the dipole pattern of air temperature in August in eastern China and the corresponding physical mechanisms

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    Based on the NCEP/NCAR reanalysis datasets,the ERA-Interim reanalysis datasets,and the observational data sets,this study investigates the relationship between the sea ice anomaly over the Barents Sea in March and the mode of "warm south-cold north"(WSCN) pattern in eastern China in August.The results indicate that the positive(negative) inconsistency of the Barents Sea ice in March corresponds to the mode of the "WSCN"("cold south-warm north",CSWN) pattern in eastern China in August.Further analyses suggested that the "WSCN"("CSWN") patterned was categorized by the atypical cyclone(anticyclone) and the ascending(sinking) motion over northeastern China as well as the uncharacteristic anticyclone(cyclone) and the sinking(ascending) motion over southern China.Besides,the surface net heat flux was mentioned as the "positive south-negative north"("negative south-positive north") pattern.Further analyses revealed that the "Silk Road" teleconnection pattern is closely related to the inconsistent atmospheric circulation in eastern China,which acts as a bridge to link the Barents Sea ice in March and the dipole temperature pattern in eastern China.Besides,the positive(negative) anomaly of the Barents Sea ice in March last until August,which accelerate the southward wave train over the Kara Sea,strength the negative phase(positive phase) of the "Silk Road" teleconnection,and further regulate the inconsistent atmospheric circulations in eastern China.On the other hand,the positive(negative) variance of the Barents Sea ice in spring results in lower(higher) temperature in northern Eurasia,which result in "positive western-negative eastern"("positive eastern-negative western") snow cover and "wet western-dry eastern"("dry western-wet eastern") soil moisture in northern Eurasia.The spatial pattern of soil moisture may last until August,which leads to the enhancement of the "Silk Road" teleconnection wave train,affecting the circulation anomaly in eastern China,and resulting in the dipole distribution of air temperature in eastern China in August.

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李惠心,孙博,周波涛,王树舟,朱宝艳,范怡,2021.3月巴伦支海海冰对中国东部8月气温偶极子型的影响及机制研究[J].大气科学学报,44(1):89-103. LI Huixin, SUN Bo, ZHOU Botao, WANG Shuzhou, ZHU Baoyan, FAN Yi,2021. Effect of the Barents Sea ice in March on the dipole pattern of air temperature in August in eastern China and the corresponding physical mechanisms[J]. Trans Atmos Sci,44(1):89-103.

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  • Received:October 13,2020
  • Revised:November 11,2020
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  • Online: March 04,2021
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