全球逐月陆表宽波段发射率数据集（1982-2019）
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本数据集基于全球陆表特征参量宽波段发射率产品（GLASS BBE）中的GLASS03B01（MODIS BBE）和GLASS03B02（AVHRR BBE），通过引入更为详细的全球土壤数据集（The Harmonized World Soil Database version 2.0）、半球和季节特征以及采样点的全局选择，开发了一种基于GLASS MODIS BBE的AVHRR BEE 估算新框架，以GLASS03B02（AVHRR BBE）作为输入数据生产了长期（1982-2019年）的AVHRR陆表宽波段发射率产品。对比原本的GLASS AVHRR发射率产品，新的发射率产品具有明显的季节变化且明显消除了2001–2019年期间 GLASS AVHRR 与 MODIS BEE 之间的差异，尤其在夏季和冬季（差异减少了 0.004）、极端干旱和湿润地区[当干旱指数（AI）<1 或AI>4 时差异减少了0.002]、高海拔地区（当 DEM > 5000 m 时差异减少了 0.01）和一些沙漠地区（当反照率 > 0.5 时差异减少了 0.005）。 此套数据集包含了1982-2019年间AVHRR逐月全球陆表宽波段发射率产品，可用于陆面模型以及陆表温度、积雪、大气降水/水汽/可降水量等反演研究。数据空间分辨率为0.05°，数据类型为浮点型。
This dataset is developed based on GLASS03B01 (MODIS BBE) and GLASS03B02 (AVHRR BBE) from the Global Land Surface Parameter Broadband Emissivity Products (GLASS BBE). By introducing the more detailed Harmonized World Soil Database version 2.0, hemispheric and seasonal characteristics, as well as global sampling point selection, we developed a novel framework for estimating AVHRR BBE based on GLASS MODIS BBE. Using GLASS03B02 (AVHRR BBE) as input data, we produced long-term (1982–2019) AVHRR global land surface broadband emissivity products. Compared with the original GLASS AVHRR emissivity product, the new emissivity product exhibits distinct seasonal variation and significantly eliminates the discrepancies between GLASS AVHRR and MODIS BBE during 2001–2019. Specifically, the discrepancies are reduced by 0.004 in summer and winter, by 0.002 in extremely arid and humid regions when aridity index (AI) < 1 or AI > 4, by 0.01 in high-altitude areas when DEM > 5000 m, and by 0.005 in some desert regions when albedo > 0.5. This dataset contains monthly global land surface broadband emissivity products derived from AVHRR during 1982–2019, which can be applied to land surface models and retrieval studies of land surface temperature, snow cover, atmospheric precipitation, water vapor and precipitable water. The data has a spatial resolution of 0.05° and is of floating-point data type.
