CHEN Yu-hang,FAN Guang-zhou,ZHANG Yong-li,et al.The Analysis of Underlying Variation Characteristics over Tibetan Plateau based on GLDAS Data[J].Journal of Chengdu University of Information Technology,2016,(02):204-212.
基于GLDAS资料的青藏高原下垫面变化特征分析
- Title:
- The Analysis of Underlying Variation Characteristics over Tibetan Plateau based on GLDAS Data
- 文章编号:
- 2096-1618(2016)02-0204-09
- Keywords:
- atmospheric science; climate change; Tibetan Plateau; underlying; GLDAS
- 分类号:
- P463.1
- 文献标志码:
- A
- 摘要:
- 为了研究青藏高原下垫面气候变化特征,利用全球陆面数据同化系统逐月资料,采用线性回归和滑动T检验等方法,对青藏高原下垫面物理量的年际变化、年际变化空间分布进行初步分析,同时分季节讨论各物理量的年际变化特征。结果表明:1948～2010年高原下垫面逐渐趋于暖湿化,能量与水分循环发生着显著的变化,高原下垫面能量变化快于水分循环变化。各要素年际变化在各个季节表现出不同的特征。高原气候变化总体表现为:地表净短波辐射减弱,净长波辐射增强。随着净短波辐射的减弱,感热通量表现出相同的变化趋势。随着总蒸散的增强,潜热通量增加。下垫面温度升高,降水增多。植被冠层含水量、地表径流增加。地温升高,使得下垫面土壤湿度加大。地表气压增加,风速减弱,比湿降低。各要素年际变化存在明显的区域特征。
- Abstract:
- Using the monthly data of Global Land Data Assimilation System and the method of linear regression and the sliding t-test, the inter-annual variability of underlying physical variables over the Tibetan Plateau(TP)and the change's spatial distribution are initially investigated and the inter-annual variability also discussed by season in order to study the feature of underlying change over TP. The results are as follows: The underlying surface of the TP tended to warm and humid from 1948 to 2010. Energy and water cycle undergo significant change. Energy cycle trend to change faster than the hydrological cycle. The climate change of elements in all seasons exhibit different characteristics. The overall performance of the TP climate change: net shortwave radiation weakens and net long wave radiation increases. With the weakening of net short-wave radiation, sensible heat flux show the same trends. With the enhancement of total evapotranspiration, latent heat flux increases. Underlying temperature is rising and precipitation become more. Both vegetation canopy water content and surface runoff slowly increase. Soil temperature's rising make the underlying surface soil moisture increase. Surface pressure get enhanced. Wind speed tends to. Near surface specific humidity decreases. Each element has a significant regional variation.
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备注/Memo
收稿日期:2015-04-23 基金项目:国家自然科学基金资助项目(41275079、41405069); 国家青年科学基金资助项目(41305077)