此数据集包含在Historical(1986-2005年)以及RCP2.6、RCP4.5、RCP8.5三种未来排放情景下（2006-2098年）北半球多年冻土融化深度处的温度数据。数据集覆盖时间为1986-2098年，共计93年。其时间分辨率为年尺度，空间分辨率为1°×1°。其中，温度小于零的区域表示存在多年冻土。北半球多年冻土数据集（1986-2098年）是根据Kudryavtsev模型算出的多年冻土融化深度处的温度（℃），温度小于零的区域可以表征为多年冻土区域。
", "ds_source": "参与CMIP5计划的5个模式在HIS、RCP2.6、RCP4.5、RCP8.5情景下的月平均温度、降水、土壤湿度数据集。在HIS情景下，数据长短为1986-2005年，各RCP情景下数据长度为2006-2098年。数据下载网址为http://www.ipcc-data.org/sim/gcm_monthly/AR5/Reference-Archive.html。
", "ds_process_way": "首先将各模式温度、降水、土壤湿度数据统一插值到1°×1°格点上。然后使用Kudryavtsev方法计算得到冻结融化深度处的温度。\nKudryavtsev模型具体计算过程见：Anisimov O.A., N.I. Shiklomanov and F.E. Nelson. Global warming and active-layer thickness: results from transient general circulation models. Global and Planetary Change. 15, 61-77 (1997).
", "ds_quality": "1、在模式筛选过程中，通过对比CMIP5模式数据在北半球区域与再分析资料的时空分布、相关系数等，选取了在北半球适用性较好，与再分析资料时空分布较为一致且相关性较高的五个模式，完成了模式的优选过程。2、数据处理、插值过程中逐步与原数据进行对比，每一步进行了严格的检查，确保了数据的准确性。3、使用本数据集估算的多年冻土面积与IPA观测结果进行比较，从空间分布于数值上均高度接近，北半球多年冻土面积在数值上偏差小于3%。综上，本数据集在北半球适用性较好，数据质量合格。
", "ds_acq_start_time": "1986-01-01 00:00:00", "ds_acq_end_time": "2005-12-31 00:00:00", "ds_acq_place": "北半球", "ds_acq_lon_east": 180.0, "ds_acq_lat_south": 0.0, "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": "apply-access", "ds_total_size": 17676791, "ds_files_count": 3, "ds_format": "nc", "ds_space_res": null, "ds_time_res": "年", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "31302b03-5442-44cc-b156-51fe0041d0b7.jpg", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "使用本数据集时，请在文章中标注数据来源：国家重点基础研究发展计划（973计划）“冰冻圈变化及其影响研究”", "ds_from_station": null, "organization_id": "b3c14ec7-0cc1-417f-8986-b6fc1352242f", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": null, "quality_level": 3, "publish_time": "2020-12-03 08:55:14", "last_updated": "2020-12-04 16:37:00", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.CCI.2020.67", "i18n": { "en": { "title": "During 1986-2005 and 1986-2098 (rcp2.6rcp4.5rcp8.5), the permafrost data sets in the northern hemisphere were collected", "ds_format": "", "ds_source": "", "ds_quality": "", "ds_ref_way": "", "ds_abstract": "", "ds_time_res": "年", "ds_acq_place": "Northern Hemisphere", "ds_space_res": "", "ds_projection": "", "ds_process_way": "", "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": [ "北半球", "多年冻土", "面积" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "北半球" ], "ds_time_tags": [ 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027, 2028, 2029, 2030, 2031, 2032, 2033, 2034, 2035, 2036, 2037, 2038, 2039, 2040, 2041, 2042, 2043, 2044, 2045, 2046, 2047, 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, 2080, 2081, 2082, 2083, 2084, 2085, 2086, 2087, 2088, 2089, 2090, 2091, 2092, 2093, 2094, 2095, 2096, 2097, 2098 ], "ds_contributors": [ { "true_name": "王澄海", "email": "wch@lzu.edu.cn", "work_for": "兰州大学大气科学学院", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "王澄海", "email": "wch@lzu.edu.cn", "work_for": "兰州大学大气科学学院", "country": "中国" } ], "ds_managers": [ { "true_name": "王澄海", "email": "wch@lzu.edu.cn", "work_for": "兰州大学大气科学学院", "country": "中国" } ], "category": "冻土" }