Response of the lower troposphere to moisture intrusions into the Arctic
Response of the lower troposphere to moisture intrusions into the Arctic
复制标题
对流层低层对北极湿气入侵的响应
DOI：
10.1002/2017gl072687
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发表时间：
2016
影响因子：
5.2
通讯作者：
T. L’Ecuyer
中科院分区：
文献类型：
--
作者：
E. Johansson;A. Devasthale;M. Tjernström;A. Ekman;T. L’Ecuyer
水汽入侵(WVI)解释了北极地区水汽输送总量的很大一部分及其变异性。WVIS可以通过对地表长波辐射的影响，为北极大气的海冰加速融化预置条件。使用NASA的A-Train卫星护航队的数据来估计对流层下部对进入北极的WVIs的响应，我们表明，WVIs与整个北冰洋平均时冬季地表变暖高达5.3K(±3.3K)，夏季高达2.3K(±1.6K)有关。这些入侵还通过增加30%的垂直云量，导致云辐射加热增加到0.15K/d，同时也导致对流层低层的稳定性减弱。冬季和春季对流层下部和地表变暖突出了了解预适应对北极冰川加速融化的贡献的重要性。
Water vapor intrusions (WVIs) explain a significant fraction of total moisture transport and its variability in the Arctic. WVIs can precondition the Arctic atmosphere for accelerated melting of sea ice through effects on surface longwave radiation. Using data from the NASA's A‐Train convoy of satellites to estimate the response of the lower troposphere to WVIs into the Arctic, we show that WVIs are associated with a surface warming of up to 5.3 K (±3.3 K) in winter and 2.3 K (±1.6 K) in summer, when averaged over the entire Arctic Ocean. The intrusions also lead to additional cloud radiative heating of up to 0.15 K/d via up to 30% increased cloudiness in the vertical and also cause a weakening of the stability in the lower troposphere. The lower tropospheric and surface warming during winter and spring highlights the importance of understanding contribution of preconditioning to accelerated ice melt in the Arctic.