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)。\n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。
", "ds_source": "利用ERA5-Land和ERA5小时风数据改进输沙通量的概念框架。
", "ds_process_way": "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）；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）。\n025和030表示参考中值粒径0.25和0.30mm，对应着沙粒起动风速5.3和5.8m s-1（标准高度上使地表沙粒处于跃移状态的最小风速）。\n容积密度为1.58g cm-3，容积通量的单位为m2 yr-1。
", "ds_quality": "数据质量良好。
", "ds_acq_start_time": "1940-01-01 00:00:00", "ds_acq_end_time": "2025-12-31 00:00:00", "ds_acq_place": "全球", "ds_acq_lon_east": 180.0, "ds_acq_lat_south": -90.0, "ds_acq_lon_west": -180.0, "ds_acq_lat_north": 90.0, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "open-access", "ds_total_size": 37264059078, "ds_files_count": 7133, "ds_format": ".tif", "ds_space_res": "", "ds_time_res": "年", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "e70e47ed-c10d-4d49-9bb3-62bbf2f06de5.jpg", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "0a4269e1-65f4-45f1-aeba-88ea3068eebf", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "10.5281/zenodo.7504489", "subject_codes": [ "170.4510" ], "quality_level": 3, "publish_time": "2023-07-25 16:22:45", "last_updated": "2026-03-27 11:08:02", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.NCDC.ZENODO.DB3956.2023", "i18n": { "en": { "title": "A dataset of global sand flux", "ds_format": ".tif", "ds_source": "Developing a conceptual framework for sediment transport flux using ERA5 Land and ERA5 hour wind data.", "ds_quality": "
The data quality is good.
", "ds_ref_way": "", "ds_abstract": "Simply, we use all effective friction velocities derived from the instantaneous estimates of 10 m u-component and v-component hourly wind speeds to infer sand flux based on the physics formulas of blown sand, and according to the existing studies (Gunn et al., 2021; Chanteloube et al., 2022; Gunn et al., 2022a; Gunn et al., 2022b), further improve the conceptual framework of sand flux, and simply define the flux potential (FP), resultant flux potential (RFP) and 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 and FP_NNW). Specifically, FP is the sum of FPs moving to all azimuths; RFP is the resultant flux potential, represents net sand transport potential under the different wind directions; RFD is the resultant flux direction, represents net trend of sand flux; FDV is flux directional variability, defined as the ratio of RFP/FP, represents that the flux moves to the same direction (approximate to 1) or many directions (approximate to 0); FP_azimuth represents the azimuthal flux potential, the sum of azimuthal flux potentials is flux potential (FP); RFP_N or RFP_E represent that FPs to all azimuths are projected to the due-north and due-east directions in order to solve the RFP, RFD and the final FDV (Li et al., 2024).\r\nThe wind speed and direction data calculated by 10 m u-component of wind and
10 m v-component wind were from the 0.1° ERA5-Land hourly wind data during 1950-2023, and the 0.25° ERA5 hourly wind data during 1940-2023.
", "ds_time_res": "年", "ds_acq_place": "Global", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Specifically, FP is the sum of FPs moving to all azimuths; RFP is the resultant flux potential, represents net sand transport potential under the different wind directions; RFD is the resultant flux direction, represents net trend of sand flux; FDV is flux directional variability, defined as the ratio of RFP/FP, represents that the flux moves to the same direction (approximate to 1) or many directions (approximate to 0); RFP_N or RFP_E represent that FPs to all azimuths are projected to the due-north and due-east directions in order to solve the RFP, RFD and the final FDV. \r\n
The 023, 025 and 030 represent reference median grain diameters with the 0.23, 0.25 and 0.36 mm, corresponding to threshold friction velocities with the 5.1, 5.3 and 5.8 m s-1 (the minimum friction velocity at the 10 m height to cause sediment particles in saltation).\r\n
The bulk density is 1.58 g cm-3, and the unit of bulk flux is m2 yr-1.\r\n
The 023, 025 and 030 represent reference median grain diameters with the 0.23, 0.25 and 0.30 mm, corresponding to threshold friction velocities with the 5.1, 5.3 and 5.8 m s-1 (the minimum friction velocity at the 10 m height to cause sediment particles in saltation).", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "https://creativecommons.org/licenses/by/4.0/", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "ds_topic_tags": [ "输沙通量", "合成输沙通量", "合成输沙方向", "方向变率" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "全球" ], "ds_time_tags": [], "ds_contributors": [ { "true_name": "李国帅", "email": "liguoshuai@lzb.ac.cn", "work_for": "中国科学院西北生态环境与资源研究所", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "李国帅", "email": "liguoshuai@lzb.ac.cn", "work_for": "中国科学院西北生态环境与资源研究所", "country": "中国" } ], "ds_managers": [ { "true_name": "李国帅", "email": "liguoshuai@lzb.ac.cn", "work_for": "中国科学院西北生态环境与资源研究所", "country": "中国" } ], "category": "沙漠与荒漠化" }