The Role of Atmospheric Rivers in Antarctic Sea Ice Variations
The Role of Atmospheric Rivers in Antarctic Sea Ice Variations
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DOI：
10.1029/2022gl102588
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发表时间：
2023-04
影响因子：
5.2
通讯作者：
Kaixin Liang;Jinfei Wang;Hao Luo;Qinghua Yang
中科院分区：
文献类型：
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作者：
Kaixin Liang;Jinfei Wang;Hao Luo;Qinghua Yang
南极海冰的变化受到来自低纬度和中纬度地区的水分和热量的影响，其中90%以上是通过大气河流（AR）输送的。本文利用ERA 5再分析和卫星观测资料，对南极海冰上的AR进行了探测，并分析了1979 - 2020年间AR对海冰变化的总体贡献。尽管四季AR频率都很低，但在边缘冰区，AR仍以每天10%以上的速度引起海冰的剧烈减少。海冰的热力学过程主导着AR引起的变化，与AR期间的异常大气条件有关。温暖、潮湿和多云的天气在寒冷季节通过增强感热通量而引起相当大的融化，但在夏季由于太阳辐射被阻挡而限制了融化。AR期间的强降水也是不可忽视的，特别是在夏季融化期间。
Antarctic sea ice variations are affected by moisture and heat from low‐ and mid‐latitudes, more than 90% of which are transported by atmospheric rivers (ARs). This study employs the ERA5 reanalysis and satellite observations to detect all the ARs over the Antarctic sea ice and analyze the general contributions of ARs on sea ice changes from 1979 to 2020. Though AR frequency is low in all seasons, ARs give rise to intense sea ice reduction at a rate of more than 10%/day in marginal ice zone. Thermodynamic processes of sea ice dominate the AR‐induced variations, associated with anomalous atmospheric conditions during ARs. Warm, moist and cloudy weather causes considerable melting by enhancing sensible heat flux in cold seasons but has restrictive influences in summer due to blocked solar radiation. Heavy precipitation during ARs is also nonnegligible, especially during the summer melt.