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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >SPATIAL AND TEMPORAL VARIATION OF SUBLIMATION ON ANTARCTICA - RESULTS OF A HIGH-RESOLUTION GENERAL CIRCULATION MODEL
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SPATIAL AND TEMPORAL VARIATION OF SUBLIMATION ON ANTARCTICA - RESULTS OF A HIGH-RESOLUTION GENERAL CIRCULATION MODEL

机译：南极叠加的时空变化-高分辨率广义环流模型的结果。

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摘要

In this paper we use output of a high-resolution general circulation model (ECHAM3 T106, resolution 1.1 degrees x 1.1 degrees) to study the spatial and temporal variation of sublimation on Antarctica. First, we compare model results with available observations of sublimation rates. The yearly cycle, with small latent heat fluxes during the winter, is well reproduced, and the agreement with sparsely available spot observations is fair. The model results suggest that a significant 10-15% of the annual precipitation over Antarctica is lost through sublimation and that sublimation plays an important role in the formation of blue ice areas. a preliminary analysis of the atmospheric boundary layer moisture budget shows that the spatial variation of sublimation in the coastal zone of East Antarctica can be explained by variations of horizontal advection of dry air. Dry air advection, and thus surface sublimation, is enhanced in areas where katabatic winds are strong and have a large downslope component and where the Antarctic topography drops suddenly from the plateau to the coastal zone. In areas where horizontal advection is small, like the plateau and the large ice shelves, special conditions must be met to make significant sublimation at the surface possible. [References: 50]
机译：在本文中，我们使用高分辨率普通环流模型（ECHAM3 T106，分辨率1.1度x 1.1度）的输出来研究南极洲升华的时空变化。首先，我们将模型结果与升华率的可用观测值进行比较。冬季的潜热通量较小的年度循环被很好地再现，并且与稀疏的现场观测结果的协议是公平的。模型结果表明，通过升华损失了南极洲年降水量的10-15％，而升华在蓝冰地区的形成中起着重要作用。大气边界层水分收支的初步分析表明，南极东部沿海地区升华的空间变化可以用干燥空气的水平对流变化来解释。干燥空气的平流作用和地表升华作用在风电场强，下坡分量大，南极地形从高原突然下降到沿海地区的地区得到增强。在水平对流较小的地区，例如高原和大型冰架，必须满足特殊条件才能使表面显着升华。 [参考：50]

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