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首页> 外文期刊>Geophysical Research Letters >Observed dimming effect during a forest fire in the southeastern United States and the role of aerosols
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Observed dimming effect during a forest fire in the southeastern United States and the role of aerosols

机译：在美国东南部森林火灾期间观察到的调光效果以及气溶胶的作用

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摘要

A surface dimming effect during a forest fire was observed in the incoming solar radiation measurements of the Georgia Automated Environmental Monitoring Network (AEMN). A combination of in situ AEMN and Moderate Resolution Imaging Spectroradiometer (MODIS) datasets were used to demonstrate the implications on the forecasts when aerosol radiative effects are not included in the Weather Research and Forecasting (WRF) model. The clear sky incoming radiative flux predicted by the model at the surface was overestimated when aerosol optical depths (AODs) exceeded 0.2, which in turn caused a positive temperature bias and a negative mixing ratio bias at the surface. These biases resulted from differences in the energy partitioning at the surface, where the main contribution was from enhanced sensible heat flux. The model atmosphere was also cooler and drier than the MODIS profiles,indicative of the aerosol induced warming below 6 km.
机译：在佐治亚州自动环境监测网（AEMN）的传入太阳辐射测量中观察到森林火灾期间的表面变暗效果。当天气研究和预报（WRF）模型未包括气溶胶辐射效应时，使用原位AEMN和中等分辨率成像光谱辐射仪（MODIS）数据集的组合来证明对预报的影响。当气溶胶光学深度（AOD）超过0.2时，高估了模型在地面预测的晴朗天空入射辐射通量，这反过来在表面产生正温度偏差和负混合比偏差。这些偏差是由于表面能量分配的差异所致，其中主要的贡献来自显热通量的增加。模型大气也比MODIS曲线凉爽干燥，表明气溶胶引起的6 km以下的变暖。

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