Arctic Summer Airmass Transformation, Surface Inversions, and the Surface Energy Budget
Arctic Summer Airmass Transformation, Surface Inversions, and the Surface Energy Budget
复制标题
北极夏季气团转变、地表逆温和地表能量收支
DOI：
10.1175/jcli-d-18-0216.1
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发表时间：
2019
影响因子：
4.9
通讯作者：
Tjernström M
中科院分区：
文献类型：
--
作者：
Tjernström M
在2014年夏季的北极云夏季实验(ACSE)期间，观测到了融化的海冰上长达一周的暖空气平流期，形成了强烈的地表温度逆温和浓雾。基于对地表能量收支的分析，我们提出了一个假设，即由于气团的转换，在靠近冰缘的区域的暖空气侵入过程中，会发生额外的地表加热。为了验证这一假设，我们研究了在ACSE期间发生的所有表面反转的情况，然后详细地描述了反转的特征。我们发现，它们总是伴随着来自南方的平流而出现，并与下沉有关。只分析海冰上的逆温个例，我们发现两类：一类是逆温过程中水汽的增加，另一类是水汽随高度的变化不变或减小。在随高度增加湿度增加的地面逆温过程中，与无地面逆温的情况相比，地面加热增加了10-25W m−2，地面湍流热通量是最大的单项。逆温中水分较少的情况通常是无云的，逆温引起的额外太阳辐射和湍流地表热通量大致被净长波辐射的损失所平衡。
During the Arctic Clouds in Summer Experiment (ACSE) in summer 2014 a weeklong period of warm-air advection over melting sea ice, with the formation of a strong surface temperature inversion and dense fog, was observed. Based on an analysis of the surface energy budget, we formulated the hypothesis that, because of the airmass transformation, additional surface heating occurs during warm-air intrusions in a zone near the ice edge. To test this hypothesis, we explore all cases with surface inversions occurring during ACSE and then characterize the inversions in detail. We find that they always occur with advection from the south and are associated with subsidence. Analyzing only inversion cases over sea ice, we find two categories: one with increasing moisture in the inversion and one with constant or decreasing moisture with height. During surface inversions with increasing moisture with height, an extra 10–25 W m−2of surface heating was observed, compared to cases without surface inversions; the surface turbulent heat flux was the largest single term. Cases with less moisture in the inversion were often cloud free and the extra solar radiation plus the turbulent surface heat flux caused by the inversion was roughly balanced by the loss of net longwave radiation.
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北极夏季云海研究（ASCOS）期间北极中部夏季的气象条件
影响因子：
6.3
作者：
M. Tjernström;C. Birch;I. Brooks;M. Shupe;P. Persson;J. Sedlar;T. Mauritsen;C. Leck;J. Paatero;M. Szczodrak;C. Wheeler
通讯作者：
C. Wheeler
影响因子：
4.6
作者：
J. Sedlar;M. Tjernström;T. Mauritsen;M. Shupe;I. Brooks;P. Persson;C. Birch;C. Leck;A. Sirevaag;M. Nicolaus;M. Nicolaus
通讯作者：
J. Sedlar;M. Tjernström;T. Mauritsen;M. Shupe;I. Brooks;P. Persson;C. Birch;C. Leck;A. Sirevaag;M. Nicolaus;M. Nicolaus
影响因子：
6.3
作者：
Shupe, M. D.;Persson, P. O. G.;Leck, C.
通讯作者：
Leck, C.
夏季北极上空的云、暖空气和气候变冷信号
影响因子：
5.2
作者：
J. Sedlar;M. Tjernström
通讯作者：
M. Tjernström
影响因子：
8
作者：
Stein, A. F.;Draxler, R. R.;Ngan, F.
通讯作者：
Ngan, F.