全球输沙通量数据集

简单地说，使用10m u和v向小时风速的瞬间估计得到的所有有效摩擦风速代入风沙物理公式推导，并参考已有研究，进一步改进输沙通量的概念框架，简化定义输沙通量(flux potential, FP)、合成输沙通量(resultant flux potential, RFP) 和方位输沙通量(azimuthal flux potential; FP_N、FP_NNE、FP_NE、FP_NEE、FP_E、FP_EES、FP_ES、FP_ESS、FP_S、FP_SSW、FP_WS、FP_WWS、FP_W、FP_WWN、FP_NW和FP_NNW)。具体地讲，FP为去往所有方位的输沙通量总和；RFP为合成输沙通量，表示各种方向风下的净输沙通量；RFD为合成通量方向，表示通量净走向；FDV为方向变率，是RFP/FP的比率，表示通量去往一个方向（接近1），通量去往很多方向（接近0）；FP_方位表示方位通量，所有16个方位通量的总和等于输沙通量（FP）；RDP_N或RDP_E是将16个方位上的输沙通量投影到正北或正东方位上，目的是为了计算合成输沙通量（RFP）、合成输沙方向（RFD）和最终的方向变率（FDV）(Li et al., 2024)。 由10m高度U和V向风速得到的风速风向数据来自于1950-2025年0.1° ERA5-Land小时风数据和1940-2025年0.25° ERA5小时风数据。Put simply, all valid instantaneous friction velocities estimated from 10-meter u and v component hourly wind speeds were substituted into aeolian sediment transport physical equations for derivations. Referencing existing studies, we further improved the conceptual framework of sediment transport flux, and simplified the definitions of three core concepts: flux potential (FP), resultant flux potential (RFP), and azimuthal flux potential (with 16 specific azimuthal flux variants including FP_N, FP_NNE, FP_NE, FP_NEE, FP_E, FP_EES, FP_ES, FP_ESS, FP_S, FP_SSW, FP_WS, FP_WWS, FP_W, FP_WWN, FP_NW, and FP_NNW). Specifically, FP refers to the total sediment transport flux across all azimuths; RFP is the resultant flux potential, representing the net sediment transport flux under winds of varying directions; RFD stands for the resultant flux direction, indicating the net orientation of the sediment flux; FDV is the directional variability, defined as the ratio of RFP to FP, which signifies that the flux is concentrated toward a single direction (close to 1) or distributed across multiple directions (close to 0); FP_azimuth refers to the azimuthal sediment transport flux, where the sum of all 16 azimuthal fluxes equals the total sediment transport flux (FP); RDP_N or RDP_E projects the sediment transport fluxes at the 16 azimuths onto the true north or true east azimuth, respectively, for the calculation of RFP, RFD, and the final FDV (Li et al., 2024). The wind speed and direction data derived from 10-meter height u and v component wind speeds are sourced from 0.1° hourly ERA5-Land wind datasets spanning 1950–2025 and 0.25° hourly ERA5 wind datasets spanning 1940–2025.

搜集汇总

背景与挑战

背景概述

该数据集是一个全球尺度的输沙通量数据产品，基于ERA5-Land和ERA5小时风数据（1940-2023年），采用风沙物理公式推导，提供了输沙通量、合成输沙通量和方位输沙通量等多个关键变量。数据集具有高时空分辨率（空间0.1°-0.25°，时间年分辨率），数据量达51.62 GB，开放获取，适用于风沙地貌、气候变化等相关研究。