Xuezhen ZHANG, Jun YIN, Mengxin BAI, Yanbo LI, Jingyun ZHENG. Development and application test of a collection system for paleoclimate research documents from ResearchGate [J]. Progress in Geography, 2020, 39(7): 1140
- Progress in Geography
- Vol. 39, Issue 7, 1140 (2020)
Fig. 1. 系统逻辑结构图Fig.1
Fig. 2. ResearchGate和NCDC文献数据中主要时间关键词及其组合的频次注：ME为千年(millennium/millennia),MWP为中世纪暖期(Medieval Warm Period),LIA为小冰期(Little Ice Age)。Fig.2
Fig. 3. ResearchGate和NCDC文献数据中主要代用资料类型关键词的频次Fig.3
Fig. 4. ResearchGate和NCDC文献数据中主要气象要素关键词的频次Fig.4
Fig. 5. ResearchGate文献数据中国家和地区名称的频次注：本图中世界全图基于自然资源部标准地图服务网站下载的审图号GS(2016)1667号的标准地图制作,底图无修改。Fig.5
Fig. 6. ResearchGate和NCDC文献数据中国家和地区名称频次的相关关系Fig.6
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Table 1.
古气候文献关键词分类
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