| Xu Daohuan,Du Ling,Ma Jingkai,Shi Huangyuan. 2020. Pathways of meridional atmospheric moisture transport in the central Arctic. Acta Oceanologica Sinica, 42(5):55－64 |
| Pathways of meridional atmospheric moisture transport in the central Arctic |
| 北极中央区经向水汽输送的主要通道 |
| Received:July 22, 2019 |
| DOI：10.1007/s13131-020-1598-9 |
| Key words:atmospheric moisture transport meridional moisture pathway AMTv during melting/freezing months Pacific Arctic sector |
| 中文关键词: 大气水汽输送 经向水汽通道 融冰-结冰期水汽 太平洋扇区 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Xu Daohuan | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | | | Du Ling | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | duling@ouc.edu.cn | | Ma Jingkai | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | | | Shi Huangyuan | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | |
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| Abstract: |
| Atmospheric moisture transport plays an important role in latent heat release and hydrologic interactions in the Arctic. In recent years, with the rapid decline in sea ice, this transport has changed. Here, we calculated the vertically integrated atmospheric moisture meridional transport (AMTv) from two global reanalysis datasets, from 1979–2015, and found moisture pathways into the central Arctic. Four stable pathways showed an occurrence frequency greater than 70%, and these pathways exhibited a perennial seasonal pattern in the atmosphere above the Laptev Sea Pathway (LSP), Canadian Arctic Archipelago Pathway (CAAP), both sides of the Greenland plateau. Another seasonal pathway appeared above the east of the Chukchi Sea (CSP) during the melting/freezing months (March to September). Through these pathways, AMTv contributed a total moisture exchange of 60%–80%—averaged over a 75°N circle—and focused on the low troposphere. Transports across the LSP, CSP and CAAP pathways likely create an enclosed moisture route. Meridional moisture fluxes are intensified in the Pacific sector of Arctic (PSA), especially during melting/freezing months. AMTv interannual variabilities are illustrated mainly in the Laptev Sea and the east Greenland pathway. Results indicate that accompanying a tendency for a stronger Beaufort Sea High in this sea level pressure field, AMTv through PSA pathways, switched from output to input, and approximately 960 km3 of equivalent liquid water was transferred into the central Arctic during each decade. The detrended AMTv increment is highly correlated with the rapid decline of old ice areas (correlation coefficient is -0.78) for their synchronous fluctuations in the 1980s and the last decade. |
| 中文摘要: |
| 水汽输送在北极潜热释放和水循环中都发挥了重要作用。近年来随着北极海冰快速减退，极区水汽输送也发生了显著变化。本文采用两套再分析数据，分析了1979-2015年北极中央区的经向水汽输送，发现了水汽经向输送的主要通道。北极中央区有四条常年存在且较为稳定的水汽输送通道，分别位于拉普捷夫海、加拿大群岛和格陵兰岛两侧，它们在同一方向的输运频率皆超过了70%。此外，楚科奇海还存在一条仅在融冰-结冰期（3-9月）出现的季节性输送通道。通过以上通道的水汽占整个75oN纬圈上水汽输送的60%-80%。拉普捷夫海、楚科奇海和加拿大群岛这三条通道构成了较稳定的北极水汽通道。近年来北极太平洋扇区的经向水汽输送增加，融冰-结冰期尤为明显。波弗特高压的增强，使得通过北极太平洋扇区的水汽由净输出转为净输入，相当于中央区每十年增加960km3液态水。而水汽经向输送的年际变化则主要出现在拉普捷夫海和东格陵兰岛的输送通道上。此外，融冰-结冰期北极中央区水汽输送的增加与5年冰面积的快速减少密切相关（系数达到-0.78），20世纪80年代以及最近十年两者几乎同步变化。 |
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