The Critical Effect of Subgrid-Scale Scheme on Simulating the Climate Impacts of Deforestation
The Critical Effect of Subgrid-Scale Scheme on Simulating the Climate Impacts of Deforestation
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次网格规模方案对模拟森林砍伐气候影响的关键作用
DOI：
10.1029/2021jd035133
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发表时间：
2021-09
期刊：
影响因子：
--
通讯作者：
Zhenzhong Zeng
中科院分区：
文献类型：
--
作者：
Dashan Wang;Jie Wu;Maoyi Huang;Laurent Z. X. Li;Dagang Wang;Ting Lin;Li Dong;Qi Li;Long Yang;Zhenzhong Zeng
地球系统模型中的陆地表面方案 (LSS) 模拟植被如何调节陆地-大气的热量、水、碳和动量通量。尽管区域气候模型的空间分辨率取得了进步，但亚网格尺度上发生的重大土地覆盖变化仍未得到妥善处理。在这里，我们通过采用三种 LSS（Noah 马赛克、Noah-MP 和社区土地模型 (CLM)）以及在天气研究和预报模型中实施的不同方法来表示子网格变异性，研究了代表热量和水通量的蒸散量对东南亚地块森林砍伐的响应。每个方案都进行了两项实验，分别进行了有和没有卫星观测森林砍伐的实验。结果表明，模拟对 LSS 中嵌入的亚网格尺度方法高度敏感。与观测到的历史气候相比，CLM 优于其他方案，诺亚马赛克显示出最大的偏差。然而，如果我们的目标是模拟土地覆盖变化对气候的影响，采用子网格方法的Noah镶嵌方案可以更好地捕捉蒸散量对森林砍伐的响应。 NoahMP 和 CLM 方案低估了主导土地覆盖类型未变化的网格单元的蒸散响应，但高估了主导类型发生变化的网格单元的响应，这是主导网格方法的一个特点。为了提高我们对细尺度土地覆盖变化引起的气候影响的理解，未来需要努力在气候模型中更好地表示次网格尺度的变异性和土地-大气通量交换。
Land surface schemes (LSSs) in Earth System Models simulate how vegetation regulates land-atmosphere fluxes of heat, water, carbon, and momentum. Despite advances in the spatial resolution of regional climate modeling, significant land cover changes occured at sub-grid scale still not properly treated. Here, we investigate the response of evapotranspiration, representing the fluxes of heat and water, to deforestation in Southeast Asian Massif by employing three LSSs (Noah mosaic, Noah-MP and Community Land Model (CLM)) with different approaches in representing sub-grid variability, implemented in the Weather Research and Forecasting model. Two experiments, with and without satellite-observed deforestation, were performed for each scheme. Results show that the simulations are highly sensitive to the subgrid-scale approaches embedded in the LSSs. Compared with the observed historical climate, CLM outperforms other schemes and Noah mosaic shows the largest bias. However, if we target the simulation of the climate impacts of land cover change, the Noah mosaic scheme taking the sub-grid approach can better capture the response of evapotranspiration to deforestation. The NoahMP and CLM schemes underestimate the evapotranspiration response in the grid cells where the dominant land cover type has not changed, but overestimate the response in those grid cells with dominant type changed, which is a characteristic of dominant-grid approach. To improve our understanding of climate impacts induced by fine-scale land cover change, future efforts to better represent subgrid-scale variability and land-atmosphere flux exchange in climate models are desirable.
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影响因子：
4.4
作者：
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影响因子：
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影响因子：
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通讯作者：
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影响因子：
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通讯作者：
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