在全球表层土壤水分数据产品的基础上，对甘南地区的土壤干旱事件的发生次数进行计算和评估。首先获取2000-2020年月表层土壤水分数据产品，计算获得2000-2020年生长季（5-9月）土壤平均水分，考虑土壤水分下降的程度，参考近期权威文献，将低于平均值一倍标准差定为土壤干旱事件发生时的土壤水分阈值，以月为单位，对每年生长季5-9月的土壤水分进行判断，按像元提取土壤水分偏低事件发生的次数，获得结果为近21年来甘南地区土壤干旱事件发生的次数。数据为甘南地区2000-2020年生长季土壤干旱的发生频次，数据类型为栅格格式（.tif），结果为土壤干旱事件发生的总次数。", "ds_source": "
原始遥感数据来源于国家青藏高原科学数据中心《全球1公里分辨率地表土壤水分数据集（2000-2020）》。", "ds_process_way": "
利用空间分辨率为1KM的2000-2020年月表层土壤水分数据，提取生长季5-9月甘南地区数据，共计105期，土壤干旱事件定义为低于平均值一倍标准差，按像元计算2000-2020年生长季土壤水分低于阈值的次数。", "ds_quality": "
原始数据来源可靠，土壤干旱定义参考青藏高原的类似研究，数据计算在Matlab软件中完成，结果可靠。", "ds_acq_start_time": "2023-11-02 00:00:00", "ds_acq_end_time": "2023-11-02 00:00:00", "ds_acq_place": "甘南藏族自治州", "ds_acq_lon_east": null, "ds_acq_lat_south": null, "ds_acq_lon_west": null, "ds_acq_lat_north": null, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 1056646, "ds_files_count": 4, "ds_format": "tif", "ds_space_res": "1km", "ds_time_res": "年", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "4decfd87-8daf-41d6-b841-67e358756e9f.png", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "c0ec87bd-ed8d-423e-ad11-8dea17bd175d", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.4510" ], "quality_level": 3, "publish_time": "2024-12-30 17:15:42", "last_updated": "2025-01-09 15:45:01", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.NCDC.NIEER.DB6703.2024", "i18n": { "en": { "title": "Occurrence of soil droughts in the 2000-2020 growing seasons in Gannan ", "ds_format": "", "ds_source": "", "ds_quality": "", "ds_ref_way": "", "ds_abstract": "", "ds_time_res": "年", "ds_acq_place": "Gannan Tibetan Autonomous Prefecture", "ds_space_res": "1km", "ds_projection": "", "ds_process_way": "", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "recommendation_value": 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, "belong_to_nieer": false, "ds_topic_tags": [ "土壤水分", "土壤干旱", "干旱频次" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "甘南地区" ], "ds_time_tags": [ 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 ], "ds_contributors": [ { "true_name": "王宇昕", "email": "wangyuxin@nieer.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "王宇昕", "email": "wangyuxin@nieer.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_managers": [ { "true_name": "王宇昕", "email": "wangyuxin@nieer.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "category": "其他" }