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6篇 您的检索式:作者名="J.A.Holmes"
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1A mid-Holocene drought interval as evidenced by lake desiccation in the Alashan Plateau,Inner Mongolia,China显示文摘The mid-Holocene in China is traditionally thought to be a warm and humid period with a strong summer monsoon, and is often termed the Holocene Climatic Optimum or Megathermal Period. Here we present lake geomorphologic and lithological evidence from the Alashan Plateau, part of the Mongolian Plateau, that indicates strong lake desiccation during the mid-Holocene. High resolution pollen data from Zhuyeze Lake, at the present summer monsoon margin, is also presented. These data show that present lakes and wetlands in the Juyanze Lake basin west of the Badain Jaran desert, in the Zhuyeze Lake basin between the Badain Jaran and Tengger deserts, and in lakes in the eastern Tengger desert, dried or experienced low lake levels in the mid-Holocene around 5000—7000 cal yr BP. Pollen data further indicate that the vegetation cover declined in both the local areas and in the Qilian Mountains, suggesting the climate was drier than that associated with the present Asian summer monsoon. This mid-Holocene drought interval was present throughout a quite large region of the south Inner Mongolian Plateau. The period was also probably colder, at least in the high Asian plateaus and mountains.CHENFahu WUWei J.A.Holmes D.B.Madsen ZHUYan JINMin C.G.Oviatt 2003Chinese Science Bulletin2003,48,14:66
2阿拉善高原中全新世干旱事件的湖泊记录研究显示文摘中国国内普遍流行的观点认为,中国中全新世是一个夏季风盛行的温暖湿润时期,称作全新世“最宜期”或“大暖期”.内蒙古西部阿拉善高原的湖泊沉积和湖泊地貌则显示了一种相反的状况,这一区域中全新世气候干旱,黑河的终闾湖泊居延泽、石羊河的终闾湖泊潴野泽和腾格里沙漠东缘的头道湖均经历了湖泊缩小或干涸过程,时代为距今7000-5000日历年.潴野泽高分辨率(50年)的孢粉记录显示,季风边缘区的石羊河流域,特别是祁连山地的植被发生显著衰退,降水减少.中全新世的干旱事件存在于现代夏季风边缘区的较大范围,包括阿拉善高原、鄂尔多斯高原、内蒙古高原中东部,甚至黄土高原南部,指示了东亚夏季风在全新世期间的一次大衰退.中全新世东亚夏季风衰退期间气候寒冷,这在青藏高原及其周边山地尤为明显.陈发虎 吴薇 朱艳 J.A.Holmes D.B.Madsen 金明 C.G.Oviatt 2004科学通报2004,49,1:72
3A carbon- and oxygen-isotope record of recent environ- mental change from Qinghai Lake, NE Tibetan Plateau显示文摘A c. 300-year oxygen and carbon isotope record derived from fine-grained and ostracod carbonate from Qinghai Lake testifies to dramatic interannual tointerdecadal limnological change. Fine-grained carbonates, which are mainly authigenic, are likely to have formed in the epilimnion of the lake and their isotopic composition reflects the summer temperature and, more importantly, the isotopic composition of the near-surface waters, which is mainly a function of evaporative concentration. Ostracod shells are secreted in the benthos of the lake, and their isotopic composition reflects summer bottom-water conditions, together with fractionation effects, which may differ between species. Differences betweencontemporaneous values from authigenic carbonates and ostracod shells may provide an indication of stratification within the lake and variations in effective precipitation over the northeast part of the Tibetan Plateau over the past 300 years. A period of moderate evaporative concentration, from about 300 to 100 yr BP, was interrupted by a marked wet phase from ~100 to 40 yr BP, which was in turnfollowed by a return to drier conditions in the most recent part of the record.The increase in ? 18O values in the latter part of the record accords well withinstrumental records of lake-level lowering and salinity increase since about 1955 AD.A.C.G.Henderson J.A.Holmes ZHANGJiawu M.J.Leng L.R.Carvalho 2003Chinese Science Bulletin2003,48,14:33
4应用湿法冶金技术的新经验显示文摘J.A.Holmes 张仁里 1982湿法冶金1982,,01:1
5应用湿法冶金技术的新经验显示文摘J.A.Holmes 张仁里 1982湿法冶金1982,,01:1
6Multi-proxy evidence for late Pleistocene-Holocene environ-mental change in arid Central Asia:An overview of the RACHAD 2001 symposium显示文摘CHENFahu J.A.Holmes 2003Chinese Science Bulletin2003,48,14:0
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