气候异常下舟山地区梅雨期降水特征浅析  

The Analysis of The Abnormal Characteristics in Plum Rain Season in Zhoushan Region under Climate Anomalies

作　　者：张绍会 徐哲永 吴姗姗 孙楠 ZHANG Shaohui(Zhoushan Mete-orological Bureau of China Meteorological Administration,Zhoushan,Zhejiang 316021)

机构地区：[1]浙江省舟山市气象局,浙江舟山316021

出　　处：《农业灾害研究》2022年第5期153-156,共4页Journal of Agricultural Catastrophology

摘　　要：利用NCEP等再分析资料,着重分析了2020年和2021年舟山地区大气环流形势的变化,得出以下结论:(1)2020年,全球受中部型厄尔尼诺事件的影响,副高总体偏弱,同时,西伯利亚长期存在的暖高压配合东北冷涡,使得北方的冷空气获得了足够抗衡副高推动雨带北移的能量,使副高难以在我国近海北抬,进而造成梅雨带在长江中下游地区和华东地区徘徊。孟加拉湾海域的特强气旋风暴“安攀”(超强台风级),驱动水汽通过其气旋性结构进入(逆时针旋转)其南侧形成西南风,获得足够多的动量和能量,使得西南风携带大量水汽涌入南海,加速了南海季风暴发。(2)2021年全球受弱的拉尼娜事件的影响,副高前期发展旺盛,同年西伯利亚中高纬度冷空气比较弱,无法与副高分庭抗礼,是造成2021年入梅早、出梅早,降水略超过常年的一个原因。后期副高迅速衰退到西太平洋,使得雨带在北方冷空气南下侵入,再次对舟山产生影响,产生了“倒黄梅”的降水现象。Used the NCEP reanalysis data to be focused on the changes of atmospheric circulation situation in Zhoushan area in 2020 and 2021,and drew the following conclusions:(1)In 2020,the global climate was in the influence of the central-type El Ni?o event,the subtropical anticyclone was generally weak,at the same time,the longstanding warm core anticyclone in Siberia,with the northeast china cold vortex,made the cold front got enough power to resist the subtropical anticyclone,it made the rain belt be difficult to move,causing the Meiyu belt to hover in the middle and lower reaches of Yangtze River and East China.The Tropical Cyclone Amphan(super typhoon Amphan)in the Bay of Bengal,took the water vapor to the South China Sea,so that it accelerated Onset of SCS Monsoon in the South China Sea.(2)In 2021,the global climate was under the influence of the La Ni?a event,the prophase of subtropical anticyclone was vigorous,in the same year,the cold front in the middle and high latitudes in Siberia was relatively weak,it could not compete with the subtropical anticyclone,which was a reason for the unusal plum rain season in this year,the anaphase of subtropical anticyclone was failed to western Pacific Ocean quickly,that made the Meiyu belt to be impacted on Zhoushan.

关 键 词：梅雨期 副高 中部厄尔尼诺事件 拉尼娜现象 

分 类 号：P461[天文地球—大气科学及气象学]