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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Regional sensible and radiative heat flux estimates for the winter Arctic during the Surface Heat Budget of the Arctic Ocean (SHEBA) experiment
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Regional sensible and radiative heat flux estimates for the winter Arctic during the Surface Heat Budget of the Arctic Ocean (SHEBA) experiment

机译：北冰洋表面热收支（SHEBA）实验期间冬季北极的区域感热辐射热通量估计

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We estimate the influence of the mosaic distribution of surface temperatures of sea ice on regional surface sensible and radiative heat fluxes on the basis of advanced very high resolution radiometer (AVHRR) temperatures. The AVHRR data were used to derive similar to 1 km(2) surface temperature values for 100 x 100 km(2) regions. Regional flux estimates are compared to direct flux measurements taken during the Surface Heat Budget of the Arctic Ocean (SHEBA) experiment in the Beaufort Sea. We describe 48 cases of clear-sky conditions between December 1997 and February 1998. The distribution of surface temperatures within each region is skewed: most temperatures fall near the value observed at the ice camp, but the distribution has a warm tail corresponding to subregions with thinner ice. Sensible heat fluxes at the ice camp were downward, from the air to the ice; Although the camp was representative of the majority of the region, the upward flux from thin ice generally balanced the downward flux to thicker ice, suggesting a regional equilibrium of near-zero sensible heat flux. This was true whether the net downward flux at the camp was large or small or whether the ice was less compact, as in January, or more compact, as in December and February. The only exception to this generalization occurred when the ice was under strong compression. The net regional radiative loss from the ice surface was similar to 22% greater than that measured on the flee at the SHEBA camp. This increase is due to the fourth-power temperature dependence of the radiative flux acting on the skewed distribution of surface temperatures. The implications for modeling are that sea ice tends toward small net surface sensible heat flux on an aggregate scale, an emergent property of the system, and that parameterizing the regional mosaic of surface temperatures to resolve correctly the radiative balance in winter is important. [References: 21]
机译：我们基于先进的超高分辨率辐射计（AVHRR）温度，估算了海冰表面温度的镶嵌分布对区域​​表面的感热和辐射热通量的影响。 AVHRR数据用于得出100 x 100 km（2）区域的类似于1 km（2）的表面温度值。将区域通量估算值与在波弗特海的北冰洋表面热收支（SHEBA）实验期间获得的直接通量测量值进行比较。我们描述了1997年12月至1998年2月之间48例晴空情况。每个区域内的地表温度分布是偏斜的：大多数温度都接近冰场观测到的值，但是该分布具有与子区域相对应的温暖尾巴。稀薄的冰。冰场的显热通量从空气到冰都在下降。尽管该阵营代表​​了该地区的大部分地区，但薄冰的向上通量通常使向下的通量与较厚的冰平衡，这表明显热通量接近零。无论营地的净向下通量是大还是小，或者冰是否像1月那样紧凑，还是像12月和2月那样紧凑，都是如此。这种概括的唯一例外发生在冰受到强烈压缩时。冰面区域的净净辐射损失比在SHEBA营地逃跑中测得的损失高出22％。这种增加归因于辐射通量对表面温度的偏斜分布的四次幂温度依赖性。该模型的含义是，海冰在总体规模上趋向于较小的净表面感热通量，这是系统的一种新兴特性，对表面温度的区域镶嵌进行参数化以正确解决冬季的辐射平衡非常重要。 [参考：21]

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