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Reconstruction of summer temperature variation from maximum density of alpine pine during 1917-2002 for west Sichuan Plateau, China

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Journal of Geographical Sciences 2008年第2期18卷 201-210页

作者： WU Pu WANG Lily SHAO Xuemei Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China

Having analyzed the tree ring width and maximum latewood density of Pinus densata from west Sichuan, we obtained different climate information from tree-ring width and maximum latewood density chronology. The growth of tree ring width was responded princi- pally to the precipitation in current May, which might be influenced by the activity of southwest monsoon, whereas the maximum latewood density reflected summer temperature （June-September）. According to the correlation relationship, a transfer function had been used to reconstruct summer temperature for the study area. The explained variance of reconstruction is 51% （F=52.099, p〈0.0001）. In the reconstruction series： before the 1930s, the climate was relatively cold, and relatively warm from 1930 to 1960, this trend was in accordance with the cold-warm period of the last 100 years, west Sichuan. Compared with Chengdu, the warming break point in west Sichuan is 3 years ahead of time, indicating that the Tibetan Plateau was more sensitive to temperature change. There was an evident summer warming signal after 1983. Although the last 100-year running average of summer temperature in the 1990s was the maximum, the running average of the early 1990s was below the average line and it was cold summer, but summer drought occurred in the late 1990s.

关键词： west Sichuan （province） plateau tree ring summer temperature

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Heat wave mitigation of ecosystems in mountain areas-a case study of the Upper Yangtze River basin

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Ecosystem Health and Sustainability 2022年第1期8卷 370-382页

作者： Yuxin Zhang Bin Fu Juying Sun Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengduChina State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengduChina Ecological Value Evaluation Centre China Quality Certification CentreBeijingChina

Background:Natural ecosystems,such as forests and grasslands,can mitigate heat waves,but research on heat wave mitigation in mountain ecosystems is lacking.Considering the upper reaches of the Yangtze River basin(URYB)as the study area,we first divided the URYB into mountainous and non-mountainous areas based on a digital elevation model(DEM).Then,we used temperature to identify heat waves and used the temperature and humidity index to identify suitable days.Finally,the differences between mountainous and non-mountainous areas were compared,and regional development strategies are proposed.Result:(1)The frequency and duration of heat waves increased by 0.433/y(Psummer from 1986 to 2015.Mountainous areas have an advantage in mitigating heat waves owing to landform-based changes in the local climate.(3)In addition to the landform,altitude was the main factor responsible for mitigating heat waves in mountainous areas.Conclusion:Parts of the plateau and whole mountain areas were found to be best for avoiding extremely high temperatures based on the number of suitable summer days from 1986 to 2015.We suggest formulating tourism promotion strategies,and strengthening tourism infrastructure,considering landscape protection and creation to promote sustainable regional development.

关键词： Ecosystem services thermal comfort livability summer temperature mountains tourism

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Mechanism of Varve Formation and Paleoenvironmental Research at Lake Bolterskardet, Svalbard, the Arctic

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Acta Geologica Sinica(English Edition) 2006年第4期80卷 557-563页

作者： CHU Guoqiang LIU Jiaqi GAO Denyi SUN Qing Institute of Geology and Geophysics Chinese Academy of Science Beijing 100029 Institute of Atmospheric Physics Chinese Academy of Science Beijing 100029 The Geological Analysis Center Beijing 100037

On the basis of observation of thin sections and ^137Cs data, laminations in sediment are interpreted to be varves in Bolterskardet Lake （78°06′ N, 16°01′ E）, Svalbard, the Arctic. Varves appear under a petrologic microscope as couplets of dark-silt and light-clay layers. The mechanism of varve formation is surmized as follows： each silt layer is the production of sediment inflow interpreted as mainly derived from snowmelt during summer; each clay layer was deposited in a stillwater environment during an ice-cover period. A light -clay layer provides an important index bed to identify the annual interface. The high accumulation rates, long period of ice cover, and topographically closed basin are probably all critical factors in forming and preserving varves. Varve thickness is known to be controlled mainly by summer temperature. The variation of varve thickness in Lake Bolterskardet can then be used to reconstruct summer temperature. The varve series show that there has been distinct decade-scale variability of summer temperature over the past 150 years. Warm periods occurred in the 1860s, around 1900, the 1930s, 1950s, and 1970s, and in the last 20 years. The varved sediments of Lake Bolterskarde preserve an ideal record for high-resolution paleoclimatic and paleoenvironmental research in this data-sparse area.

关键词： Arctic sediments varves paleoclimate summer temperature

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The mechanism of varve formation and paleoenvironmental research at Lake Bolterskardet,Svalbard,Arctic

The mechanism of varve formation and paleoenvironmental rese...

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中国科学院地质与地球物理研究所2006学术年会

作者： CHU Guoqiang~(1,*),LIU Jiaqi~1,Gao Denyi~2 and SUN Qing~2 1 Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029 2 Institute of Atmospheric Physics,Chinese Academy of Science,Beijing 100029 3 The Geological Analysis Center,Beijing 100037

On the basis of observation of thin sections and Cs data,laminations in sediment are interpreted to be varves in Bolterskardet Lake(78°06′N,16°01′E),Svalbard,Arctic.Varves appear under a petrologic microscope as couplets of dark-silt and light-clay layers.The mechanism of varve formation is surmized as follows:each silt layer is the production of sediment inflow interpreted as mainly derived from snowmelt during summer;each clay layer was deposited in a Stillwater environment during an ice-cover period.A light -clay layer provides an important index bed to identify the annual interface.The high accumulation rates,long period of ice cover,and topographically closed basin are probably all critical factors in forming and preserving varves.Varve thickness is known to be controlled mainly by summer temperature.The variation of varve thickness in Lake Bolterskardet can then be used to reconstruct summer temperature.The varve series show that there has been distinct decade-scale variability of summer temperature over the past 150 years.Warm periods occurred in the 1860s,around 1900,the 1930s, 1950s,and 1970s,and in the last 20 years.The varved sediments of Lake Bolterskarde preserve an ideal record for high-resolution paleoclimatic and paleoenvironmental research in this data-sparse area.

关键词： Arctic sediments varves paleoclimate summer temperature

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