Stratospheric and Tropospheric Flux Contributions to the Polar Cap Energy Budgets
Stratospheric and Tropospheric Flux Contributions to the Polar Cap Energy Budgets
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DOI：
10.1175/jcli-d-20-0722.1
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发表时间：
2021-02
影响因子：
4.9
通讯作者：
C. Cardinale;B. Rose;A. Lang;A. Donohoe
中科院分区：
文献类型：
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作者：
C. Cardinale;B. Rose;A. Lang;A. Donohoe
进入极地的湿静力能通量在极地的能量收支和气候中起着关键作用。虽然通常从垂直整合的角度（Fwall）进行研究，但本分析研究了其垂直结构，使用NASA-MERRA-2再分析计算1980-2016年期间70 ° N和65 ° S的气候和异常感，潜和势能通量。气候通量的垂直结构是双峰型的，峰值出现在对流层中下层和平流层中上层。对流层顶的近零通量定义了平流层（Fstrat）和对流层（Ftrop）对Fwall贡献的边界。特别是在70 ° N，Fstrat被发现对Fwall的气候学和变率很重要，在冬季对Fwall的贡献为20.9 Wm−2（Fwall的19%），解释了Fwall的23%的方差。在冬季，Fstrat的异常向极增加之前，平流层突然变暖，其次是增加传出长波辐射异常，对北极的表面能量收支的影响不大。相反，大部分的能量输入的异常极地增加弗特罗普去变暖的北极表面。Ftrop被认为是一个更好的度量比Fwall的大气环流对北极地面气候的影响进行评估。2已接受在《气候杂志》上发表。DOI 10.1175/JCLI-D-20-0722.1。由纽约州立大学奥尔巴尼LIBR SB 23为您带来|未经认证|已下载02/22/21 04：38 PM UTC
The flux of moist static energy into the polar regions plays a key role in the energy budget and climate of the polar regions. While usually studied from a vertically integrated perspective (Fwall), this analysis examines its vertical structure, using the NASA-MERRA-2 reanalysis to compute climatological and anomalous fluxes of sensible, latent, and potential energy across 70◦N and 65◦S for the period 1980–2016. The vertical structure of the climatological flux is bimodal, with peaks in the midto lower-troposphere and midto upper-stratosphere. The near zero flux at the tropopause defines the boundary between stratospheric (Fstrat) and tropospheric (Ftrop) contributions to Fwall. Especially at 70◦N, Fstrat is found to be important to the climatology and variability of Fwall, contributing 20.9 Wm−2 to Fwall (19% of Fwall) during the winter and explaining 23% of the variance of Fwall. During winter, an anomalous poleward increase in Fstrat preceding a sudden stratospheric warming is followed by an increase in outgoing longwave radiation anomalies, with little influence on the surface energy budget of the Arctic. Conversely, a majority of the energy input by an anomalous poleward increase in Ftrop goes toward warming the Arctic surface. Ftrop is found to be a better metric than Fwall for evaluating the influence of atmospheric circulations on the Arctic surface climate. 2 Accepted for publication in Journal of Climate. DOI 10.1175/JCLI-D-20-0722.1. Brought to you by SUNY ALBANY LIBR SB23 | Unauthenticated | Downloaded 02/22/21 04:38 PM UTC