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Potential mechanisms governing the variation in rain/snow frequency over the northern Antarctic Peninsula during austral summer
Atmospheric Research ( IF 4.5 ) Pub Date : 2021-08-15 , DOI: 10.1016/j.atmosres.2021.105811
Sai Wang 1 , Ge Liu 1 , Minghu Ding 1 , Wen Chen 2, 3 , Wenqian Zhang 1 , Junmei Lv 1
Affiliation  

Precipitation with different phases can exert different influences on the Antarctic mass balance. Using the observational rain and snow days from the Great Wall Station, ERA-interim reanalysis, and other data, this study investigates the mechanisms governing the year-to-year variability of precipitation phase (i.e., rainfall and snowfall) over the northern Antarctic Peninsula (AP) during austral summer (December, January, and February; abbreviated as DJF) for the period 1985–2016. The results reveal that the rainfall and snowfall anomalies are controlled mainly by the change in the proportion of precipitation occurring as rain and snow, and the latter is strongly influenced by the change in air temperature. Through regulating the air temperature, different atmospheric circulation anomalies affect the variability of the rainfall and snowfall over the northern AP during summer. Specifically, a circulation pattern with an anomalous anticyclone over the Malvinas Islands and an anomalous cyclone over the Amundsen–Bellingshausen Seas (ABS) can increase summer rainfall, whereas an anomalous cyclone over the Weddell Sea facilitates more snowfall. The summertime atmospheric circulation anomalies, which modulate the variability of rainfall over the northern AP, are primarily caused by an atmospheric teleconnection pattern persisting from austral spring (September–November, SON) to summer. Such a persistent teleconnection pattern can be attributed to the long-time maintenance of sea surface temperature anomalies due to air-sea interaction processes.



中文翻译:

南极夏季期间南极半岛北部雨雪频率变化的潜在机制

不同相的降水会对南极物质平衡产生不同的影响。本研究利用长城站的观测雨雪天数、ERA-interim再分析等数据,研究了南极半岛北部降水阶段(即降雨和降雪)逐年变化的机制(AP) 1985 年至 2016 年期间的南方夏季(12 月、1 月和 2 月;缩写为 DJF)。结果表明,降雨和降雪异常主要受雨雪降水比例变化控制,而后者受气温变化影响较大。通过调节空气温度,不同的大气环流异常影响夏季亚太地区北部降雨和降雪的变化。具体而言,马尔维纳斯群岛上空异常反气旋和阿蒙森-贝灵斯豪森海 (ABS) 上空异常气旋的环流模式会增加夏季降雨量,而威德尔海上空的异常气旋会促进更多降雪。夏季大气环流异常调节了 AP 北部降雨的变化,主要是由从南方春季(9 月至 11 月,SON)到夏季持续存在的大气遥相关模式引起的。这种持久的遥相关模式可归因于海气相互作用过程导致海面温度异常的长期维持。马尔维纳斯群岛上空异常反气旋和阿蒙森-贝灵斯豪森海 (ABS) 上空异常气旋的环流模式会增加夏季降雨量,而威德尔海上空的异常气旋会促进更多降雪。夏季大气环流异常调节了 AP 北部降雨的变化,主要是由从南方春季(9 月至 11 月,SON)到夏季持续存在的大气遥相关模式引起的。这种持久的遥相关模式可归因于海气相互作用过程导致海面温度异常的长期维持。马尔维纳斯群岛上空异常反气旋和阿蒙森-贝灵斯豪森海 (ABS) 上空异常气旋的环流模式会增加夏季降雨量,而威德尔海上空的异常气旋会促进更多降雪。夏季大气环流异常调节了 AP 北部降雨的变化,主要是由从南方春季(9 月至 11 月,SON)到夏季持续存在的大气遥相关模式引起的。这种持久的遥相关模式可归因于海气相互作用过程导致海面温度异常的长期维持。而威德尔海上空的异常气旋促进了更多的降雪。夏季大气环流异常调节了 AP 北部降雨的变化,主要是由从南方春季(9 月至 11 月,SON)到夏季持续存在的大气遥相关模式引起的。这种持久的遥相关模式可归因于海气相互作用过程导致海面温度异常的长期维持。而威德尔海上空的异常气旋促进了更多的降雪。夏季大气环流异常调节了 AP 北部降雨的变化,主要是由从南方春季(9 月至 11 月,SON)到夏季持续存在的大气遥相关模式引起的。这种持久的遥相关模式可归因于海气相互作用过程导致海面温度异常的长期维持。

更新日期:2021-08-17
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