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Temporal and spatial variation of annual mean air temperature in arid and semiarid region in northwest China over a recent 46 year period 被引量:24
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作者 Chen, ShaoYong Shi, YuanYuan +1 位作者 Guo, YuZhen Zheng, YanXiang 《Journal of Arid Land》 SCIE 2010年第2期87-97,共11页
We analyzed the 1961-2006 mean surface air temperature data of 138 stations in China’s northwest arid and semi-arid areas(CNASA),to measure climate change in terms of annual mean air temperature changes.We used metho... We analyzed the 1961-2006 mean surface air temperature data of 138 stations in China’s northwest arid and semi-arid areas(CNASA),to measure climate change in terms of annual mean air temperature changes.We used methods of linear regression analysis,multinomial fitting,Empirical Or-thogonal Function(EOF),Rotated Empirical Orthogonal Function(REOF),Mann-Kendall,Glide T-examination,wavelet analysis and power spectrum analysis.The results show that(1) the warming rate of the annual mean air temperature in CNASA was 0.35oC/10a during the 1961-2006 study period.Some places in the west part of Xinjiang and east part of the Qinghai plateau,which is impacted by the terrain of leeward slope,exhibit smaller increasing trends.However,the majority of region has shown distinct warming in line with general global warming;(2) The standard deviation of the annual mean temperature distribution is non-uniform.The south Xinjiang and east Qinghai-south Gansu areas show relatively small standard deviations,but the inter-annual variation in annual mean air temperature in the greater part of the region is high;(3) Inner Mongolia,Shaanxi,Gansu,Ningxia and Tarim Basin are the areas where the temperature changes are most sensitive to the environment.The degree of uniformity in annual mean air temperature increase is higher in the arid and semi-arid area.From the early 1970s,the trend in tempera-ture changed from a decrease to an increase,and there was a marked increase in mean temperature in 1986.After that mean temperature went through a period of rapid increase.The entire area’s 10 hottest years all occurred in or since the 1990s,and 90% of various sub-districts’ hottest years also occurred after 1990.The process of temperature change appears to have a roughly 5-year and a 10-year cycle;(4) An-nual mean air temperature variation has regional differences.In Inner Mongolia-Xinjiang and Shaanxi-Gansu-Ningxia-Qinghai areas,the temperature variation in their northern areas was very different from that in their southern areas;(5) Using the REOF method we divided the region into 4 sub-regions:the Northern region,the Plateau region,the Southern Xinjiang region and the Eastern region.The region’s annual mean air temperature transition has regional differences.The Plateau and Southern Xinjiang re-gions got warmer steadily without any obvious acceleration in the rate of warming.The Northern region’s warming started about 5-years earlier than that of the low latitude Eastern region.The ’Startup region’ of the Qinghai-Tibet Plateau,appears to undergo temperature changes 3 to 10 years earlier than the other regions,and exhibits inter-decadal variations 1 to 2 years ahead of the other regions. 展开更多
关键词 northwest area of china annual mean air temperature climatic warming
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The ecological system and the regionalization of landscape reconstruction in northwest of China
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作者 Peicheng LI Guoyuan DU +2 位作者 Qilei LI Jinfeng WANG Feimin ZHENG 《Frontiers of Agricultural Science and Engineering》 2014年第4期291-298,共8页
The northwest of China is a vast area with abundant resources and significant potential for development.However,the ecological system is extremely vulnerable to damage and must be managed carefully.Thus,the Chinese go... The northwest of China is a vast area with abundant resources and significant potential for development.However,the ecological system is extremely vulnerable to damage and must be managed carefully.Thus,the Chinese government is strengthening research on improvement and reconstruction of the ecological system and landscape in northwest of China while moving forward with large-scale development in west China.The disadvantages and vulnerabilities in the northwest area in China are presented.It is suggested that the reconstruction of landscape should be conducted by step by step regionalization across the various ecological systems in the 3.04 million km^(2) northwest area of China.The first level regionalization results of reconstruction of landscape are discussed. 展开更多
关键词 reconstruction of landscape ecological system the northwest area of china science and technology action
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The Maike of China's Northwest
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作者 HE YANGUANG and ZHAO PICONG 《China Today》 1995年第5期60-62,共3页
TheMaikeofChina'sNorthwestThey'rehonest,hardworking,poor,andcompletelydevoidofgreed-they'reChina'ssaltofthee... TheMaikeofChina'sNorthwestThey'rehonest,hardworking,poor,andcompletelydevoidofgreed-they'reChina'ssaltoftheearth.ByHEYANGUANG... 展开更多
关键词 The Maike of china’s northwest
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