LessRad全球地表长波上行辐射数据集（5km，hourly，1982-2022）

长波上行辐射（LWUR）是气象和水文模型中的一个重要驱动参数。现有的遥感长波辐射产品在精度、时空分辨率以及解释和量化不同尺度长波辐射变化的能力方面仍有很大的改进空间。根据斯蒂芬玻尔兹曼定律，LWUR取决于长波下行辐射、地表发射率和地表温度，该产品运用青藏高原数据中心的LessRad全球地表长波下行辐射数据集，以及ERA5的地表温度数据集结合GLASS产品中的宽波段发射率进行LWUR的计算。该产品具有更高的精度（全球每小时均方根误差为20.42 W/m²）、更高的时间分辨率（每小时）和空间分辨率（5km）。新产品在研究更精细尺度的地表长波上行辐射时空变化上显示出独特优势，为分析陆地-大气相互作用、量化气候反馈等应用提供了宝贵的数据源，对了解地球的能量收支及其气候动态非常有帮助。

Longwave Upward Radiation (LWUR) is an important driving parameter in meteorological and hydrological models. Existing remote sensing longwave radiation products still have considerable room for improvement in terms of accuracy, spatiotemporal resolution, and the capacity to interpret and quantify longwave radiation changes across diverse scales. According to the Stefan-Boltzmann Law, LWUR depends on longwave downward radiation, surface emissivity and surface temperature. This dataset calculates LWUR by combining the LessRad global surface longwave downward radiation dataset from the Tibetan Plateau Data Center, ERA5 surface temperature dataset, and the broadband emissivity product from the GLASS product suite. This product boasts higher accuracy (with a global hourly root-mean-square error of 20.42 W/m²), higher temporal resolution (hourly) and spatial resolution (5 km). The new product demonstrates unique advantages in investigating spatiotemporal variations of surface longwave upward radiation at finer scales, providing valuable data sources for applications such as analyzing land-atmosphere interactions and quantifying climate feedbacks, and greatly contributes to understanding Earth’s energy budget and its climate dynamics.

搜集汇总

背景与挑战

背景概述

LessRad全球地表长波上行辐射数据集（5km，hourly，1982-2022）是一个高精度、高时空分辨率的数据集，用于研究地表长波上行辐射的时空变化。该数据集基于青藏高原数据中心的LessRad全球地表长波下行辐射数据集和ERA5的地表温度数据集，结合GLASS产品的宽波段发射率计算得出，具有全球每小时均方根误差为20.42 W/m²的高精度，适用于陆地-大气相互作用和气候反馈分析。