本数据研究区为黑河下游额济纳现代绿洲和居延泽古绿洲。包括数据：（1）额济纳现代绿洲释光年代.doc，（2）居延泽古绿洲C-14年代.doc，（3）研究区河道分析生成的DEM影像jpg，（4）研究剖面图doc，旨在研究干旱区绿洲生态系统绿洲化、荒漠化的过程和驱动机制。
", "ds_source": "研究区DEM影像河道分析提取由美国加州大学洛杉矶分校地理系GIS研究组提供。
\n\n样品经前处理分选出纯石英和钾长石，使用单片测量法。释光测量在Risoe-OSL/TL-14释光测量仪上完成。环境辐射本底使用中子活化方法（NAA）测量U、Th、K含量得到，在北京原子能所完成。数据处理与计算又中科院寒旱所沙漠室释光实验室完成。
\n\n", "ds_process_way": "DEM数据由ArcGIS软件处理。
\n\n(1)年龄算法和模型介绍: 使用软件Analyst处理测量所得数据，然后通过释光强度（Ln/Tn）与等效剂量（De）关系选择合理De值用于年龄计算。放射性元素的浓度通过转换系数转换成为年剂量率。\n(2)参考文献: Aitken M J. 1998. An introduction to optical dating. Oxford: Oxford University Press
", "ds_quality": "原始数据取决于样品测量信号与仪器测量本底比值，这一区域样品释光信号与本底比值大于100:1。因此精度良好。
", "ds_acq_start_time": "2012-01-01 00:00:00", "ds_acq_end_time": "2012-12-31 00:00:00", "ds_acq_place": "黑河下游额济纳现代绿洲和居延泽古绿洲", "ds_acq_lon_east": 100.76666666666667, "ds_acq_lat_south": 41.45, "ds_acq_lon_west": 100.15, "ds_acq_lat_north": 42.516666666666666, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 8655657, "ds_files_count": 3, "ds_format": "jpg and word", "ds_space_res": null, "ds_time_res": "年", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "3c1fda0a-12e9-4291-b43f-8ff1bfc565f5.png", "ds_thumb_from": 0, "ds_ref_way": "赵晖，黑河下游绿洲历史时期演化年代及驱动因子数据集（2012年），国家冰川冻土沙漠科学数据中心(www.ncdc.ac.cn)，2020，doi：10.12072/ncdc.973Desert.db0014.2020", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "eb2b3ac4-919d-433d-b987-bcee1ae83c9e", "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": "2020-12-21 11:35:05", "last_updated": "2020-12-21 11:35:05", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.973Desert.2020.154", "i18n": { "en": { "title": "Data set of evolution time and driving factors of oasis in the lower reaches of Heihe River (2012)", "ds_format": "", "ds_source": "Channel analysis and extraction of DEM images in the study area was provided by GIS research group of Geography Department of UCLA.
\nPure quartz and K-feldspar were separated from the samples by pretreatment, and the single-chip measurement method was used. The luminescent measurement was performed on Risoe OSL / tl-14. The environmental radiation background was obtained by measuring u, th and K contents by NAA at Beijing Atomic Energy Institute. The data processing and calculation have been completed by the laboratory of luminescence of desert room, Institute of cold and drought, Chinese Academy of Sciences.
\n", "ds_quality": "The original data depends on the ratio of sample measurement signal to background measured by instrument, and the ratio of sample luminescence signal to background is greater than 100:1 in this area. Therefore, the accuracy is good.
", "ds_ref_way": "", "ds_abstract": "The study area is Ejina modern oasis and juyanze ancient oasis in the lower reaches of Heihe River. Including data: (1) Ejina modern oasis luminescent age.doc, (2) juyanze ancient oasis c-14.doc, (3) DEM image JPG generated by river channel analysis in the study area, (4) study profile doc, which aims to study the process and driving mechanism of oasis and desertification in arid area.
", "ds_time_res": "年", "ds_acq_place": "Ejina modern oasis and juyanze ancient oasis in the lower reaches of Heihe River", "ds_space_res": "", "ds_projection": "", "ds_process_way": "DEM data are processed by ArcGIS software.
\n(1) Age algorithm and model introduction: the software analyst is used to process the measured data, and then the reasonable DE value is selected for age calculation according to the relationship between luminous intensity (LN / TN) and equivalent dose (DE). The concentration of radioactive elements is converted into annual dose rate by conversion coefficient.\n(2) Reference: Aitken m J. 1998. An introduction to optical dating. Oxford: Oxford University Press
", "ds_ref_instruction": " " } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "ds_topic_tags": [ "绿洲", "驱动因子", "演化" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "黑河下游", "居延泽", "额济纳" ], "ds_time_tags": [ 2012 ], "ds_contributors": [ { "true_name": "赵晖", "email": "hzhao@lzb.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": "赵晖", "email": "hzhao@lzb.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": "王涛", "email": "wangtao@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" }, { "true_name": "赵晖", "email": "hzhao@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "category": "沙漠与荒漠化" }