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Air masses, Atmospheric motion

机译:空气质量,大气运动

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In this study, we use the long-term satellite data to investigate seasonal and interannual variation of low-cloud fraction (LCF) and the associated controlling factors over the eastern and western North Pacific. On the seasonal time scale, the enhanced LCF over the eastern North Pacific in summer is actively coupled with strong estimated inversion strength (EIS) and 700-hPa relative humidity, and the LCF over the western North Pacific in winter is large and mainly caused by increased sensible heat flux and tropospheric low-level cold advection. On the interannual time scale, the increased LCF over the eastern North Pacific in summer is associated with increased EIS and decreased sea surface temperatures, in which the El Nino plays an important role; the enhanced LCF over the western North Pacific in spring and winter has a positive correlation with enhanced sensible heat flux (SHF) and tropospheric low-level cold advection, which can be partly explained by the subpolar frontal zone (SPFZ) intensity.
机译:在这项研究中,我们使用长期卫星数据来调查北太平洋东部和西部低云部分(LCF)的季节和年际变化以及相关的控制因素。在季节时间尺度上,夏季北太平洋东部LCF的增强与估计反演强度(EIS)和700hPa相对湿度的强烈关联,而冬季北太平洋西部的LCF较大,主要是由于增加了显热通量和对流层低空平流。在每年的时间尺度上,夏季北太平洋东部LCF的增加与EIS的增加和海面温度的下降有关,其中厄尔尼诺现象起着重要的作用;春季和冬季,北太平洋西部的LCF增强与显热通量(SHF)和对流层低空冷平流增强呈正相关,这可以部分归因于亚极额锋区(SPFZ)强度。

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    《Oceanographic Literature Review》 |2019年第5期|976-979|共4页
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