Influence of snow cover changes on surface radiation and heat balance based on the WRF model

Yu Lingxue; Liu Tingxiang; Bu Kun; Yang Jiuchun; Chang Liping; Zhang Shuwen

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Influence of snow cover changes on surface radiation and heat balance based on the WRF model

机译：基于WRF模型的积雪变化对地表辐射和热平衡的影响

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The snow cover extent in mid-high latitude areas of the Northern Hemisphere has significantly declined corresponding to the global warming, especially since the 1970s. Snow-climate feedbacks play a critical role in regulating the global radiation balance and influencing surface heat flux exchange. However, the degree to which snow cover changes affect the radiation budget and energy balance on a regional scale and the difference between snow-climate and land use/cover change (LUCC)-climate feedbacks have been rarely studied. In this paper, we selected Heilongjiang Basin, where the snow cover has changed obviously, as our study area and used the WRF model to simulate the influences of snow cover changes on the surface radiation budget and heat balance. In the scenario simulation, the localized surface parameter data improved the accuracy by 10 % compared with the control group. The spatial and temporal analysis of the surface variables showed that the net surface radiation, sensible heat flux, Bowen ratio, temperature and percentage of snow cover were negatively correlated and that the ground heat flux and latent heat flux were positively correlated with the percentage of snow cover. The spatial analysis also showed that a significant relationship existed between the surface variables and land cover types, which was not obviously as that for snow cover changes. Finally, six typical study areas were selected to quantitatively analyse the influence of land cover types beneath the snow cover on heat absorption and transfer, which showed that when the land was snow covered, the conversion of forest to farmland can dramatically influence the net radiation and other surface variables, whereas the snow-free land showed significantly reduced influence. Furthermore, compared with typical land cover changes, e.g., the conversion of forest into farmland, the influence of snow cover changes on net radiation and sensible heat flux were 60 % higher than that of land cover changes, indicating the importance of snow cover changes in the surface-atmospheric feedback system.

机译：随着全球变暖，北半球中高纬度地区的积雪范围已大大减少，尤其是自1970年代以来。降雪气候的反馈在调节全球辐射平衡和影响地表热通量交换方面起着关键作用。但是，积雪变化在多大程度上影响区域范围内的辐射预算和能量平衡，并且很少研究积雪气候与土地利用/覆盖变化（LUCC）-气候反馈之间的差异。本文以积雪变化明显的黑龙江盆地为研究区域，并利用WRF模型模拟了积雪变化对地表辐射收支和热量平衡的影响。在场景模拟中，与对照组相比，局部表面参数数据将精度提高了10％。地表变量的时空分析表明，净表面辐射，显热通量，鲍恩比，温度和积雪百分比呈负相关，地表热通量和潜热通量与积雪的百分比呈正相关。覆盖。空间分析还表明，地表变量与土地覆盖类型之间存在显着的相关性，与积雪变化的相关性并不明显。最后，选择了六个典型的研究区域来定量分析积雪下的土地覆盖类型对热吸收和传递的影响，这表明当土地被积雪覆盖时，森林向农田的转化会显着影响净辐射和其他表面变量，而无雪土地的影响显着降低。此外，与典型的土地覆盖变化（例如，森林转化为农田）相比，雪覆盖变化对净辐射和显热通量的影响要比土地覆盖变化高60％，这表明了雪覆盖变化的重要性。表面大气反馈系统。

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《Theoretical and applied climatology》 |2017年第2期|205-215|共11页
作者
Yu Lingxue; Liu Tingxiang; Bu Kun; Yang Jiuchun; Chang Liping; Zhang Shuwen;
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Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130012, Jilin, Peoples R China;

Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130012, Jilin, Peoples R China;

Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130012, Jilin, Peoples R China;

Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130012, Jilin, Peoples R China;

Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130012, Jilin, Peoples R China;

Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130012, Jilin, Peoples R China;

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Influence of snow cover changes on surface radiation and heat balance based on the WRF model

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