Airmass Origin in the Arctic. Part I: Seasonality
Airmass Origin in the Arctic. Part I: Seasonality
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气团起源于北极。
DOI：
10.1175/jcli-d-14-00720.1
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发表时间：
2015
影响因子：
4.9
通讯作者：
L. Polvani
中科院分区：
文献类型：
--
作者：
C. Orbe;P. Newman;D. Waugh;M. Holzer;M. Holzer;L. Oman;Feng Li;L. Polvani;L. Polvani
北极地区的气团起源的第一个气候学是严格定义的气团分数，根据它最后接触行星边界层（PBL）的位置划分空气。对戈达德地球观测系统化学-气候模式（GEOSCCM）进行的现代气候积分结果表明，北极700毫巴以下的大部分空气最后接触到60°N极向的边界层。相比之下，700毫巴以上的空气中有62%（±0.8%）来自北方中纬度地区（即，“中纬度空气”）。700毫巴以上大气质量分数的季节变化表明，在北半球冬季，来自中纬度的空气主要来自海洋，其中26%（±1.9%）的最后接触边界层在东太平洋，21%（±0.87%）在大西洋，16%（±1.2%）在西太平洋。相比之下，在夏季，中纬度空气主要来自陆地，绝大多数来自亚洲[41%（±1.0%）]，其次是北美[2.0%]。
AbstractThe first climatology of airmass origin in the Arctic is presented in terms of rigorously defined airmass fractions that partition air according to where it last contacted the planetary boundary layer (PBL). Results from a present-day climate integration of the Goddard Earth Observing System Chemistry–Climate Model (GEOSCCM) reveal that the majority of air in the Arctic below 700 mb last contacted the PBL poleward of 60°N. By comparison, 62% (±0.8%) of the air above 700 mb originates over Northern Hemisphere midlatitudes (i.e., “midlatitude air”). Seasonal variations in the airmass fractions above 700 mb reveal that during boreal winter air from midlatitudes originates primarily over the oceans, with 26% (±1.9%) last contacting the PBL over the eastern Pacific, 21% (±0.87%) over the Atlantic, and 16% (±1.2%) over the western Pacific. During summer, by comparison, midlatitude air originates primarily over land, overwhelmingly so over Asia [41% (±1.0%)] and, to a lesser extent, over North America [2...
影响因子：
4.9
作者：
Catto, Jennifer L.;Shaffrey, Len C.;Hodges, Kevin I.
通讯作者：
Hodges, Kevin I.