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Terrestrial sources of summer arctic moisture and the implication for arctic temperature patterns
npj Climate and Atmospheric Science ( IF 9 ) Pub Date : 2021-04-21 , DOI: 10.1038/s41612-021-00181-y
Tyler S. Harrington , Jiang Zhu , Christopher B. Skinner

Sea ice melt and ocean heat accumulation in the Arctic are strongly influenced by the presence of atmospheric water vapor during summer. While the relationships between water vapor concentration, radiation, and surface energy fluxes in the Arctic are well understood, the sources of summer Arctic water vapor are not, inhibiting understanding and prediction of Arctic climate. Here we use the Community Earth System Model version 1.3 with online numerical water tracers to determine the geographic sources of summer Arctic water vapor. We find that on average the land surface contributes 56% of total summer Arctic vapor with 47% of that vapor coming from central and eastern Eurasia. Given the proximity to Siberia, near-surface temperatures in the Arctic between 90°E-150°E, including the Laptev Sea, are strongly influenced by concentrations of land surface-based vapor. Years with anomalously large concentrations of land surface-based vapor in the Arctic, and especially in the Laptev Sea region, often exhibit anomalous near-surface poleward flow from the high latitudes of Siberia, with links to internal variability such as the Arctic Dipole anomaly.



中文翻译:

夏季北极水分的陆地来源及其对北极温度模式的影响

夏季,大气中存在水汽,极大地影响了北极的海冰融化和海洋热量积聚。尽管人们很好地了解了北极水汽浓度,辐射和表面能通量之间的关系,但夏季北极水汽的来源却不了解,这阻碍了人们对北极气候的了解和预测。在这里,我们使用带有在线数字水示踪剂的社区地球系统模型1.3版来确定夏季北极水蒸气的地理来源。我们发现,陆地表面平均贡献了夏季北极总蒸气的56%,其中47%来自欧亚大陆中部和东部。鉴于靠近西伯利亚,北极的近地表温度介于90°E-150°E之间,包括拉普捷夫海,受到陆地表面蒸气浓度的强烈影响。在北极地区,特别是在拉普捷夫海地区,异常高浓度的地表水汽年份通常表现为西伯利亚高纬度地区异常的近地极水流,并与诸如北极偶极子异常之类的内部变化有关。

更新日期:2021-04-21
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