Formation of contrasting March surface air temperature trends in the eastern Bering Sea and the Sea of Okhotsk during 1979–2015
Formation of contrasting March surface air temperature trends in the eastern Bering Sea and the Sea of Okhotsk during 1979–2015
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DOI：
10.1007/s00704-018-2685-0
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发表时间：
2018-10
影响因子：
3.4
通讯作者：
Zhang Chen;R. Wu
中科院分区：
文献类型：
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作者：
Zhang Chen;R. Wu
1979-2015年期间，白令海东部（下降趋势）和鄂霍次克海（上升趋势）中心的地面气温呈相反趋势。本文分析了这两个地区地面气温变化趋势形成反差的原因。分析表明，向下长波辐射和异常纬向平流是影响上述地区地面气温趋势的两个主要因素。地面湍流热通量趋势是地面气温趋势的结果。白令海东部的降温趋势与云量减少趋势和偏北风趋势有关。前者减少向下的长波辐射，后者导致异常的冷平流。鄂霍次克海的变暖趋势与导致向下长波辐射增加的云量增加和引起异常暖平流的南风趋势有关。云的变化与北太平洋北方上空的反气旋风变化有关。表面气温升高趋势似乎有助于鄂霍次克海海冰减少趋势。目前的分析表明，大气环流变化的重要作用，在形成相反的3月地面气温趋势在东白令海和鄂霍次克海。
An opposite trend in surface air temperature is observed with centers over the eastern Bering Sea (decreasing trend) and the Sea of Okhotsk (increasing trend) during 1979–2015. The present study analyzes the reasons for the formation of the contrasting surface air temperature trends in the above two regions. Analysis shows that downward longwave radiation and anomalous meridional advection are two major terms for surface air temperature trends in the above regions. The surface turbulent heat flux trends are results of surface air temperature trends. The cooling trend over the eastern Bering Sea is related to the cloud cover decreasing trend and northerly wind trend. The former reduces downward longwave radiation, and the latter leads to anomalous cold advection. The warming trend over the Sea of Okhotsk is associated with the cloud cover increase that leads to downward longwave radiation increase and the southerly wind trend that induces anomalous warm advection. The cloud changes are related to anticyclonic wind changes over the northern North Pacific. The surface air temperature increasing trends appear to contribute to the sea ice decreasing trends in the Sea of Okhotsk. The present analysis suggests an important role of atmospheric circulation changes in the formation of opposite March surface air temperature trends over the eastern Bering Sea and the Sea of Okhotsk.