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首页> 外文期刊>Journal of Climate >West Antarctic Ice Sheet Cloud Cover and Surface Radiation Budget from NASA A-Train Satellites
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West Antarctic Ice Sheet Cloud Cover and Surface Radiation Budget from NASA A-Train Satellites

机译：西南南极冰盖覆盖云覆盖和表面辐射预算从美国宇航局A-Train卫星

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Clouds are an essential parameter of the surface energy budget influencing the West Antarctic Ice Sheet (WAIS) response to atmospheric warming and net contribution to global sea level rise. A 4-yr record of NASA A-Train cloud observations is combined with surface radiation measurements to quantify the WAIS radiation budget and constrain the three-dimensional occurrence frequency, thermodynamic phase partitioning, and surface radiative effect of clouds over West Antarctica (WA). The skill of satellite-modeled radiative fluxes is confirmed through evaluation against measurements at four Antarctic sites (WAIS Divide ice camp and Neumayer, Syowa, and Concordia stations). Owing to perennial high-albedo snow and ice cover, cloud infrared emission dominates over cloud solar reflection and absorption leading to a positive net all-wave cloud radiative effect (CRE) at the surface, with all monthly means and 99.15% of instantaneous CRE values exceeding zero. The annual-mean CRE at the WAIS surface is 34Wm(-2), representing a significant cloud-induced warming of the ice sheet. Low-level liquid-containing clouds, including thin liquid water clouds implicated in radiative contributions to surface melting, are widespread and most frequent in WA during the austral summer. In summer, clouds warm the WAIS by 26Wm(-2), on average, despite maximum offsetting shortwave CRE. Glaciated cloud systems are strongly linked to orographic forcing, with maximum incidence on the WAIS continuing downstream along the Transantarctic Mountains.
机译：云是影响西南极冰盖（WAIS）对大气变暖和净贡献的基本参数，对全球海平面上升。 NASA A-Train云观测的4 yr记录与表面辐射测量相结合，以量化WAIS辐射预算，并限制云层的三维发生频率，热力相位分区和西南极洲（WA）的表面辐射效果。通过评估四个南极地点（WAIS划分冰营和Neumayer，Syowa，Syowa，Syowa，Syowa和Concordia站）来确认卫星建模辐射助液的技​​能。由于多年生的高级冰雪和冰盖，云红外排放占据云太阳反射和吸收，导致表面上的正净全波云辐射效果（CRE），所有月均均为瞬时CRE值的99.15％超过零。 WAIS表面的年平均CRE是34WM（-2），代表冰盖的显着云诱导的变暖。含低水平的含液云，包括薄的液体水云，涉及到表面熔化的辐射贡献，在澳大利亚夏季的WA中普遍且最常见。在夏天，云在26WM（-2）的情况下，云度高，尽管最大的偏移短波CRE。冰川云系统与地形迫使强烈连接，具有最大的发病率在Trantantarctic山脉的下游继续下游。

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    《Journal of Climate》 |2017年第16期|共20页
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  • 正文语种 eng
  • 中图分类 气候学;
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