Himawari-8 每小时气溶胶产品版本 3.1 的评估与不确定性分析及其在 COVID-19 疫情爆发之前和期间对地表太阳辐射的影响
Evaluation and uncertainty analysis of Himawari-8 hourly aerosol product version 3.1 and its influence on surface solar radiation before and during the COVID-19 outbreak.
作者信息
Tang Chenqian, Shi Chong, Letu Husi, Ma Run, Yoshida Mayumi, Kikuchi Maki, Xu Jian, Li Nan, Zhao Mengjie, Chen Liangfu, Shi Guangyu
机构信息
State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China.
出版信息
Sci Total Environ. 2023 Sep 20;892:164456. doi: 10.1016/j.scitotenv.2023.164456. Epub 2023 May 27.
The hourly Himawari-8 version 3.1 (V31) aerosol product has been released and incorporates an updated Level 2 algorithm that uses forecast data as an a priori estimate. However, there has not been a thorough evaluation of V31 data across a full-disk scan, and V31 has yet to be applied in the analysis of its influence on surface solar radiation (SSR). This study firstly investigates the accuracy of V31 aerosol products, which includes three categories of aerosol optical depth (AOD) (AOD, AOD, and AOD) as well as the corresponding Ångström exponent (AE), using ground-based measurements from the AERONET and SKYNET. Results indicate that V31 AOD products are more consistent with ground-based measurements compared to previous products (V30). The highest correlation and lowest error were seen in the AOD, with a correlation coefficient of 0.8335 and minimal root mean square error of 0.1919. In contrast, the AE shows a larger discrepancy with measurements unlike the AE and AE. Error analysis reveals that V31 AOD has generally stable accuracy across various ground types and geometrical observation angles, however, there are higher uncertainties in areas with high aerosol loading, particularly for fine aerosols. The temporal analysis shows that V31 AOD performs better compared to V30, particularly in the afternoon. Finally, the impacts of aerosols on SSR based on the V31 AOD are investigated through the development of a sophisticated SSR estimation algorithm in the clear sky. Results demonstrate that the estimated SSR is significant consistency with those of well-known CERES products, with preservation of 20 times higher spatial resolution. The spatial analysis reveals a significant reduction of AOD in the North China Plain before and during the COVID-19 outbreak, resulting in an average 24.57 W m variation of the surface shortwave radiative forcing in clear sky daytime.
每小时一次的 Himawari - 8 版本 3.1（V31）气溶胶产品已发布，它采用了一种更新的二级算法，该算法使用预报数据作为先验估计。然而，尚未对全圆盘扫描的 V31 数据进行全面评估，并且 V31 尚未应用于分析其对地表太阳辐射（SSR）的影响。本研究首先利用 AERONET 和 SKYNET 的地面测量数据，研究 V31 气溶胶产品的准确性，该产品包括三类气溶胶光学厚度（AOD）（AOD、AOD 和 AOD）以及相应的埃斯特朗指数（AE）。结果表明，与之前的产品（V30）相比，V31 的 AOD 产品与地面测量数据更一致。在 AOD 中观察到最高的相关性和最低的误差，相关系数为 0.8335，最小均方根误差为 0.1919。相比之下，与 AE 和 AE 不同，AE 与测量值的差异更大。误差分析表明，V31 的 AOD 在各种地面类型和几何观测角度下精度总体稳定，然而，在气溶胶负荷高的地区，特别是细颗粒物气溶胶，不确定性较高。时间分析表明，V31 的 AOD 比 V30 表现更好，特别是在下午。最后，通过开发一种精确的晴空 SSR 估计算法，研究了基于 V31 AOD 的气溶胶对 SSR 的影响。结果表明，估计的 SSR 与著名的 CERES 产品具有显著的一致性，同时保留了高 20 倍的空间分辨率。空间分析显示，在 COVID - 19 疫情爆发前和期间，华北平原的 AOD 显著降低，导致晴空白天地表短波辐射强迫平均变化 24.57 W m。
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