ICESat-2激光测高卫星首次将微脉冲多波束光子计数激光雷达技术应用于卫星平台,具有多波束、高精度测量等优势,在科学研究和实际应用中具有广阔前景。本文以2011年1月至2024年7月中国知网数据库和Web of Science(WOS)核心合集数据库的...ICESat-2激光测高卫星首次将微脉冲多波束光子计数激光雷达技术应用于卫星平台,具有多波束、高精度测量等优势,在科学研究和实际应用中具有广阔前景。本文以2011年1月至2024年7月中国知网数据库和Web of Science(WOS)核心合集数据库的文献为样本,借助文献计量学方法,利用CiteSpace.6.3.R3软件,分析了ICESat-2激光测高卫星研究的国内外发文量变化规律。通过对国内外期刊发文量、关键词、研究热点进行可视化分析和对比分析,揭示了ICESat-2激光测高卫星研究领域的热点和发展趋势,以为相关研究提供参考。展开更多
Snow samples collected from two snow pits (2.5 m and 3.5 m deep) along the route of the 1996/1997 Chinese Antarctic Inland Expedition in Princess Elizabeth Land, East Antarctica, have been analyzed for chemical compo...Snow samples collected from two snow pits (2.5 m and 3.5 m deep) along the route of the 1996/1997 Chinese Antarctic Inland Expedition in Princess Elizabeth Land, East Antarctica, have been analyzed for chemical composition and oxygen isotope ratio. Annul accumulation layers can be well identified based on fluctuations of major anions (especially Cl -) and δ 18 O. However, no obvious seasonal variations of cation concentrations were found in the profiles. The results provide a useful tool for dating the snow stratum in this region. High sulfate (SO 2- 4) concentrations found in the two snow pit profiles for the periods of 1992 1995 may be due to the June 1991 Pinatubo (Philippines) volcanic eruption and August 1991 Cerro Hudson eruption in Chile.展开更多
文摘ICESat-2激光测高卫星首次将微脉冲多波束光子计数激光雷达技术应用于卫星平台,具有多波束、高精度测量等优势,在科学研究和实际应用中具有广阔前景。本文以2011年1月至2024年7月中国知网数据库和Web of Science(WOS)核心合集数据库的文献为样本,借助文献计量学方法,利用CiteSpace.6.3.R3软件,分析了ICESat-2激光测高卫星研究的国内外发文量变化规律。通过对国内外期刊发文量、关键词、研究热点进行可视化分析和对比分析,揭示了ICESat-2激光测高卫星研究领域的热点和发展趋势,以为相关研究提供参考。
文摘Snow samples collected from two snow pits (2.5 m and 3.5 m deep) along the route of the 1996/1997 Chinese Antarctic Inland Expedition in Princess Elizabeth Land, East Antarctica, have been analyzed for chemical composition and oxygen isotope ratio. Annul accumulation layers can be well identified based on fluctuations of major anions (especially Cl -) and δ 18 O. However, no obvious seasonal variations of cation concentrations were found in the profiles. The results provide a useful tool for dating the snow stratum in this region. High sulfate (SO 2- 4) concentrations found in the two snow pit profiles for the periods of 1992 1995 may be due to the June 1991 Pinatubo (Philippines) volcanic eruption and August 1991 Cerro Hudson eruption in Chile.
