Close relationship between the East Asian westerly jet and Russian far East surface air temperature in summer
Close relationship between the East Asian westerly jet and Russian far East surface air temperature in summer
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夏季东亚西风急流与俄罗斯远东地表气温关系密切
DOI：
10.1080/16742834.2018.1467726
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发表时间：
2018-05
影响因子：
2.3
通讯作者：
LU Ri-Yu
中科院分区：
文献类型：
--
作者：
LIN Xiao-Zhen;LI Chao-Fan;LIN Zhong-Da;LU Ri-Yu
夏季东亚对流层上层西风急流（EAJ）的年际变化特征是其轴向位移，即在EAJ的北方和南方侧翼之间的纬向风异常呈跷跷板状。这项研究揭示了俄罗斯远东地区的地面气温与东亚赤道北方侧翼的密切关系。与俄罗斯远东地区的暖地面有关，西风在东亚西风带的北方侧翼减速。这种关系可以用俄罗斯远东地区地面气温与上空环流之间的正反馈机制来解释：与EAJ的北方侧翼的减弱西风相关的反气旋环流异常引起俄罗斯远东的地面变暖，并且较暖的地面可以反过来充当热源并引起对流层上部的局部反气旋环流异常，从而使东亚西风带北方侧翼的西风减速。这一结果意味着，更好地描述夏季的表面条件在俄罗斯远东地区可能有利于季节性预报东亚赤道，随后，东亚夏季气候。
ABSTRACT The interannual variability of the east asian upper-tropospheric westerly jet (EAJ) in summer is characterized by the meridional displacement of its axis, or a seesaw pattern of zonal wind anomalies between the northern and southern flanks of the EAJ. This study reveals a close relationship between the surface air temperature in the russian far east and the northern flank of the EAJ. Related to a warmer surface in the russian far east, the westerly decelerates in the northern flank of the EAJ. The relationship can be explained by a positive feedback mechanism between the surface air temperature in the russian far east and the overhead circulation: the anticyclonic circulation anomaly related to a weakened westerly in the northern flank of the EAJ induces surface warming in the russian far east and the warmer surface can in turn act as a heat source and induces a local anticyclonic circulation anomaly in the upper troposphere, therefore decelerating the westerly in the northern flank of the EAJ. The result implies that a better description of the summer surface condition in the russian far east may benefit seasonal forecasts of the EAJ and, subsequently, east asian summer climate.
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影响因子：
4.1
作者：
通讯作者：
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影响因子：
2.8
作者：
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影响因子：
4
作者：
Reza Kia;Hoong-Kun Funa;Hadi Kargarb
通讯作者：
Reza Kia;Hoong-Kun Funa;Hadi Kargarb
影响因子：
2.7
作者：
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影响因子：
2.5
作者：
J. Llibre;F. Rong
通讯作者：
J. Llibre;F. Rong