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Chinese Science Bulletin 2007年第23期52卷 3261-3266页

作者： ZHANG YongJun KANG ShiChang QIN DaHe grigholm bjorn MAYEWSKI Paul A. Institute of Tibetan Plateau Research Chinese Academy of Sciences (CAS) Beijing 100085 China Graduate School of CAS Beijing 100049 China National Key Laboratory of Cryospheric Sciences CAS Lanzhou 730000 China Climate Change Institute University of Maine Orono ME 04469 USA

Annual accumulation records covering 1935 to 2004 were reconstructed using Geladaindong ice core in the source of Yangtze River. A significant positive correlation between annual accumulation and precipitation from nearby meteorological stations was found, suggesting ice core accumulation could be taken as a precipitation proxy in the region. In the past 70 years, precipitation in the Geladaindong region was low from 1930s to early 1960s, and the lowest value occurred in the later 1950s. Since 1960s, precipitation increased dramatically and reached the maximum around 1980s, then decreased slightly in 1990s. By using Mann-Kendall rank statistical test method, a change point for precipitation was de- termined in 1967. Analysis of the atmospheric circulation over the Tibetan Plateau suggested that, compared with the southwest wind during the low precipitation period (before 1967), it extended about 2 latitudes northward during high precipitation period (after 1967). Moreover, during the high precipita- tion, the trough over the Bal Karshi Lake was also enhanced, and both the meridional wind and vapor transporting displayed a remarkable aggrandizement.

关键词：大气循环西藏气候学物质蓄积

Tibetan Plateau Geladaindong black carbon ice core record(1843-1982):Recent increases due to higher emissions and lower snow accumulation

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Advances in Climate Change Research 2016年第3期7卷 132-138页

作者： Matthew JENKINS Susan KASPARI KANG Shi-Chang bjorn grigholm Paul A.MAYEWSKI Department of Geological Sciences Central Washington UniversityEllensburg 98926USA State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China Key Laboratory of Tibetan Environment Changes and Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Climate Change Institute University of MaineOrono 04469USA

Black carbon(BC) deposited on snow and glacier surfaces can reduce albedo and lead to accelerated melt. An ice core recovered from Guoqu glacier on Mt. Geladaindong and analyzed using a Single Particle Soot Photometer(SP2) provides the ?rst long-term(1843-1982) record of BC from the central Tibetan Plateau. Post 1940 the record is characterized by an increased occurrence of years with above average BC, and the highest BC values of the record. The BC increase in recent decades is likely caused by a combination of increased emissions from regional BC sources, and a reduction in snow accumulation. Guoqu glacier has received no net ice accumulation since the 1980 s, and is a potential example of a glacier where an increase in the equilibrium line altitude is exposing buried high impurity layers. That BC concentrations in the uppermost layers of the Geladaindong ice core are not substantially higher relative to deeper in the ice core suggests that some of the BC that must have been deposited on Guoqu glacier via wet or dry deposition between 1983 and 2005 has been removed from the surface of the glacier, potentially via supraglacial or englacial meltwater.

关键词： Black carbon Ice core Tibetan Plateau Glacier melt

Recent temperature increase recorded in an ice core in the source region of Yangtze River

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Chinese Science Bulletin 2007年第6期52卷 825-831页

作者： KANG ShiChang ZHANG YongJun QIN DaHe REN JiaWen ZHANG QiangGong bjorn grigholm Paul A. MAYEWSKI Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Key Laboratory of Cryosphere and Environment Chinese Academy of Sciences Lanzhou 730000 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Climate Change Institute University of Maine Orono ME 04469 USA

Interests on climate change in the source region of Yangtze River have been raised since it is a region with the greatest warming over the Tibetan Plateau (TP). A 70-year history of precipitation δ^(18)O has been recovered using an ice core record retrieved in a plat portion of the firn area in the Guoqu Glacier (33°34′37.8″N, 91°10′35.3″E, 5720 m a.s.l.), Mt. Geladaindong (the source region of Yangtze River), in November, 2005. By using a significant positive relationship between ice core δ^(18)O record and summer air temperature (July to September) from the nearby meteorological stations, a history of summer air temperature has been reconstructed for the last 70 years. Summer temperature was relatively low in 1940s and high in 1950s to the middle of 1960s. The lowest temperature occurred in the middle of 1970s. Temperature was low in 1980s and dramatically increased since 1990s, keeping the trend to the begin-ning of the 21st century. The warming rate recorded in the ice core with 0.5℃/10 a since 1970s is much higher that that in the central TP and the Northern Hemisphere (NH), and it becomes 1.1℃/10 a since 1990s which is also higher than these from the central TP and the NH, reflecting an accelerated warm-ing and a more sensitive response to global warming in the high elevation region.

关键词：长江源头地区冰芯青藏高原温度升高 δ^18O记录

Seasonal air temperature variations retrieved from a Geladaindong ice core, Tibetan Plateau

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Journal of Geographical Sciences 2007年第4期17卷 431-441页

作者： ZHANG Yongjun KANG Shichang QIN Dahe REN Jiawen ZHANG Yulan bjorn grigholm Paul MAYEWSKI Institute of Tibetan Plateau Research CAS Beijing 100085 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Cryosphere and Environment CAREEI CAS Lanzhou 730000 China Climate Change Institute University of Maine Orono ME 04469 USA

A 70-year history of precipitation δ^18O record has been retrieved using an ice core drilled from a plat portion of the firn area in the Guoqu Glacier （33°34＇37.8″ N, 91°10＇35.3″ E, 5720 m a.s.l.） on Mt. Geladaindong （the source region of Yangtze River） during October and November, 2005. Based on the seasonality of δ^18O records and the significant positive relationships between monsoon/non-monsoon δ^18O values and summer/spring air temperature from the nearby meteorological stations, the history of summer and spring air temperature have been reconstructed for the last 70 years. The results show that both summer and spring air temperature variations present similar trends during the last 70 years. Regression analysis indicates that the slope of the temperature-δ^18O relationship is 1.3℃/‰ for non-monsoon δ^18O values and spring air temperature, and 0.4℃/‰ for monsoon δ^18O values and summer air temperature. Variation of air temperature recorded in the ice core is consistent with that in the Northern Hemisphere （NH）, however, the warming trend in the Geladaindong region is more intense than that in the NH, reflecting a higher sensitivity to global warming in the high elevation regions. In addition, warming trend is greater in spring than in summer.

关键词： ice core δ^18O summer spring air temperature variations Mt. Geladaindong Tibetan Plateau

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青藏高原中部大气粉尘变化的冰芯记录

青藏高原中部大气粉尘变化的冰芯记录

中国青藏高原研究会2006学术年会

作者：张拥军康世昌秦大河任贾文 bjorn grigholm Paul Mayewski 中国科学院青藏高原研究所中国科学院研究生院中国科学院冰冻圈与环境联合重点实验室 Climate Change Institute University of Maine OronoME04469USA

研究表明我国沙尘暴主要发生区域在青藏高原和北方干旱半干旱地区,12-3月沙尘暴发生中心集中在青藏高原。由于青藏高原的沙尘暴可以直接将沙尘物质输送到对流层中上部,对大气粉尘的贡献不可忽视,从而已引起了科学界的广泛关注。通过冰...

研究表明我国沙尘暴主要发生区域在青藏高原和北方干旱半干旱地区,12-3月沙尘暴发生中心集中在青藏高原。由于青藏高原的沙尘暴可以直接将沙尘物质输送到对流层中上部,对大气粉尘的贡献不可忽视,从而已引起了科学界的广泛关注。通过冰芯记录来恢复大气粉尘的变化可以弥补

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近期青藏高原长江源区急剧升温的冰芯证据

近期青藏高原长江源区急剧升温的冰芯证据