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Comprehensive evaluation of surface air temperature reanalysis over China against urbanization-bias-adjusted observations

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Advances in Climate Change Research 2021年第6期12卷 783-794页

作者： ZHANG Si-Qi ren guo-yu ren yu-yu ZHANG Ying-Xian XUE Xiao-Ying Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan430074China Laboratory for Climate Studies National Climate CenterChina Meteorological AdministrationBeijing100081China Key Laboratory for Cloud Physics China Meteorological AdministrationBeijing100081China

The reanalysis datasets (CRA40) have now been developed in China Meteorological Administration. We aim to compare the differences in surface air temperature (SAT) between observational that has been adjusted for urbanization bias and reanalysis data (NCEPV1, NCEPV2, ERA5, CFSR, MERRA, JRA55, 20CRV3 and CRA40) over China's Mainland during 1961–2015. The main results are presented as follows. The correlation and standard deviation between the reanalysis data and observations exhibit highly consistent interannual variability and dispersion, with the interannual SAT variability in JRA55 being closest to the observations for 1961–2015 and that of ERA5 for 1979–2015;the dispersions of 20CRV3 is most consistent with the observations for 1961–2015 and that of NCEPV1 for 1979–2015. Although annual mean SAT of the reanalysis is generally 0–2.0 ℃ lower than the observations, the bias in the SAT climatology of 20CRV3 is the least for 1961–2015 in all reanalysis datasets and that of CRA40 is the least for 1979–2015. The trends of NCEPV1 is closer to the observations than other reanalysis for 1961–2015 and that of 20CRV3 for 1979–2015. The biases in terms of interannual variability, dispersion, climatology, and linear trend are increase with altitude. Overall, in terms of the similarity of multiple measures to the urbanization bias-adjusted observations, JRA55 and CRA40 show the best performances for the periods 1961–2015 and 1979–2015 respectively in reproducing various aspects of climatological and climate change features in China's Mainland.

关键词： Temperature Reanalysis data Urbanization bias Adjusted observations Comparison Evaluation China

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Urbanization as a major driver of urban climate change

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Advances in Climate Change Research 2015年第1期6卷 1-6页

作者： ren guo-yu Laboratory for Climate Studies National Climate CenterChina Meteorological Administration

1. Definition Urbanization is the process of urban development and is characterized by the expansion of built-up areas and the growth of population in cities and towns. In the contexts of global change research and climatic science, urbanization is usually regarded as a special manifestation of land use and land cover （LULC） change on a local scale.

关键词：气候变化城市化驱动力

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NUMERICAL SIMULATION OF HYDRODYNAMIC CHARACTERISTICS ON AN ARC CROWN WALL USING VOLUME OF FLUID METHOD BASED ON BFC

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Journal of Hydrodynamics 2011年第6期23卷 767-776页

作者： LI Xue-yan ren Bing WANG guo yu WANG Yong-xue State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023China

In the present study, a new algorithm based on the Volume Of Fluid （VOF） method is developed to simulate the hydrodynamic characteristics on an arc crown wall. Structured grids are generated by the coordinate transform method in an arbitrary complex region. The Navier-Stokes equations for two-dimensional incompressible viscous flows are discretized in the Body Fitted Coordinate （BFC） system. The transformed SIMPLE algorithm is proposed to modify the pressure-velocity field and a transformed VOF method is used to trace the free surface. Hydrodynamic characteristics on an arc crown wall are obtained by the improved numerical model based on the BFC system （BFC model）. The velocity field, the pressure field and the time profiles of the water surface near the arc crown wall obtained by using the BFC model and the Cartesian model are compared. The BFC model is verified by experimental results.

关键词： Body Fitted Coordinate (BFC) SIMPLE scheme Volume Of Fluid (VOF) method arc crown wall staggered grid

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An Efficient Query Rewriting Approach for Web Cached Data Management

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 122-126页

作者： WANG Bin YANG Xiao-chun WANG guo-ren yu Ge Liu Hui-lin School of Information Science and Engineering Northeastern University Shenyang 110004 Liaoning China

With the internet development, querying data on the Web is an attention problem of involving information from distributed, and often dynamically, related Web sources. Basically, some subqueries can be effectively cached from previous queries or materialized views in order to achieve a better query performance based on the notion of rewriting queries. In this paper, we propose a novel query-rewriting model, called Hierarchical Query Tree, for representing Web queries. Hierarchical Query Tree is a labeled tree that is suit able for representing the inherent hierarchy feature of data on the Web. Based on Hierarchical Query Tree, we use case based approach to determine what the query results should be. The definitions of queries and query results are both re presented as labeled trees. Thus, we can use the same model for representing cases and the medium query results can also be dynamically updated by the user queries. We show that our case-based method can be used to answer a new query based on the combination of previous queries, including changes of requirements and various information sources.

关键词： hierarchical query tree datalog query rewriting

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Climate change in the Hindu Kush Himalaya

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Advances in Climate Change Research 2017年第3期8卷 137-140页

作者： ren guo-yu Arun Bhakta SHRESTHA Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China Department of Atmospheric Science School of Environmental Science China University of Geosciences Wuhan 430074 China International Centre for Integrated Mountain Development Kathmandu 3226 Nepal

The Hindu Kush Himalaya is the highest mountainous andplateau system in the world, sitting on most of the world'shighest peaks over 8000 m in height (Fig. 1). This regionencompasses an area of more than 4.3 million km2 and is characterized by a diversity of physiographic landscapes, climate types and bio-systems, the largest cryosphere in the world beyond the two poles, and being the source of a number of highly important large rivers including the Brahmaputra, Ganges, Indus, Mekong, Yangtze, and Yellow Rivers. The HKH is populated by about 210 million people and an additional 1.3 billion people live in downstream basins of the ten large rivers originating from this region.

关键词： The Hindu Kush Himalaya Yellow Rivers

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黄淮海流域蒸发量的变化及其原因分析

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水科学进展 2005年第5期16卷 666-672页

作者：郭军任国玉天津市气象局气候服务中心天津300074 国家气候中心北京100081

利用研究区1956-2000年117个气象台站的小型蒸发皿观测资料,分析了黄淮海流域蒸发量的变化趋势及其可能原因。结果表明,近50年来本区蒸发量减少十分显著,其变化速率一般在-50 mm/10a,平原地区最大变化速率达到-80mm/10a以上。蒸发量下... 详细信息

利用研究区1956-2000年117个气象台站的小型蒸发皿观测资料,分析了黄淮海流域蒸发量的变化趋势及其可能原因。结果表明,近50年来本区蒸发量减少十分显著,其变化速率一般在-50 mm/10a,平原地区最大变化速率达到-80mm/10a以上。蒸发量下降最明显的季节是春季和夏季,其中春季减少最大区域主要在海河流域的东南部和黄河下游,而夏季的减少主要在淮河流域。造成蒸发量减少的直接气候原因可能是日照时数及太阳辐射的减少,平均风速和气温日较差的降低可能也起着重要的作用。

关键词：蒸发量气候变化黄淮海流域变化特征

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Inhibitory Effects of Alpha-zearalenol on Angiotensin II-Induced Integrin β_3 mRNA via Suppression of Nuclear Factor-κB

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Biomedical and Environmental Sciences 2005年第5期18卷 314-320页

作者： SU-MIN LI XIAO-MING WANG JIN QIU QIN SI HENG-YI guo ren-yu SUN QI-XIA WU Department of Pathophysiology Institute of Basic Medical Sciences Chinese Academy of Medical Sciences School of Basic Medicine Peking Union Medical College 5 Dong Dan San Tiao Beijing 100005 China

To investigate the effect of α-zearalenol on angiotensin If-induced β3 integrin mRNA expression in human umbilical vein endothelial cells （HUVECs）. Methods The mRNA level in integrin β3 was determined by reverse transcription-polymerase chain reaction. Endothelial NF-κB activity was determined by the luciferase activity assay of plasmid NF-κB-LUC. Results The angiotensin Ⅱ- induced β3 integrin mRNA expression was inhibited by α-zearalenol and 17β-estradiol （10nmol/L ^-1 μmol/L）, but not influenced by ICI 182, 780, a pure competitive antagonist for estrogen receptor or a nitric oxide inhibitor N^ω-Nitro-L-arginine methyl ester hydrochloride. Alpha-zearalenol and 17β-estradiol suppressed the angiotensin Ⅱ-induced activation of NF-κB in endothelial cells. Condusion Alpha-zearalenol inhibits angiotensin Ⅱ-induced integrin β3 mRNA expression by suppressing NF-κB activation in endothelial cells.

关键词： Alpha-zearalenol Integrin β3 Endothelial cell NF-κB 17β-estradiol

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URBAN HEAT ISLAND EFFECT AND ITS CONTRIBUTION TO OBSERVED TEMPERATURE INCREASE AT WUHAN STATION, CENTRAL CHINA

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Journal of Tropical Meteorology 2019年第1期25卷 102-113页

作者： JIA Wen-qian ren guo-yu SUONAN Kan-zhuo ZHANG Pan-feng WEN Kang-min ren Yong-jian Department of Atmospheric Sciences China University of Geosciences Laboratory for Climate Studies China Meteorological Administration National Climate Center Wuhan Regional Climate Center

Based on an in-homogeneity adjusted dataset of the monthly mean temperature, minimum and maximum temperature, this paper analyzes the temporal characteristics of Urban Heat Island(UHI) intensity at Wuhan Station, and its impact on the long-term trend of surface air temperature change recorded during 1961-2015 by using an urban-rural method. Results show that UHI effect is obvious near Wuhan Station in the past 55 years, especially for minimum temperature. The strongest UHI intensity occurs in summer and the weakest in winter. For the period 1961-2004, UHI intensity undergoes a significant increase near the urban station, with the increase especially large for the period 1988-2004, but the last 10 years witness a significant decrease, with the decrease in minimum temperature being more significant than that of maximum temperature. The annual mean urban warming and its contribution to overall warming are 0.18 C/10 yr and 48.8% respectively for the period 1961-2015, with a more significant and larger urbanization effect seen in Tminthan Tmax. Thus, a large proportion warming, about half of the overall increase in annual mean temperature,as observed at the urban station, can be attributed to the rapid urbanization in the past half a century.

关键词： data in-homogeneity UHII urban warming climate change

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城市化对石家庄站日气温变化的影响

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地球物理学报 2015年第2期58卷 398-410页

作者：任国玉张雷卞韬任玉玉李娇南京信息工程大学大气科学学院南京210044 中国气象局气候研究开放实验室国家气候中心北京100081 中国气象局国家气象信息中心北京100081 河北省石家庄市气象局石家庄050081

利用1962—2011年逐日平均、最低和最高气温资料,对比分析了石家庄站和藁城站平均、最低和最高气温的概率分布特征.石家庄站是我国少有的自建站以来从未迁址的城市气象站,而附近的藁城站可近似看作乡村气象站.结果表明:城市化致使石家庄... 详细信息

利用1962—2011年逐日平均、最低和最高气温资料,对比分析了石家庄站和藁城站平均、最低和最高气温的概率分布特征.石家庄站是我国少有的自建站以来从未迁址的城市气象站,而附近的藁城站可近似看作乡村气象站.结果表明:城市化致使石家庄站1962—2011年平均、最低和最高气温的概率密度分布向高温方向偏移,其中对最低气温分布的影响尤其明显,对最高气温分布的影响很小;受城市化影响,石家庄站最低气温概率密度分布的高温部分增温比低温部分增温更加明显,最低气温分布形状更加扁平;相对于1962—1986年,1987—2011年石家庄站平均、最低和最高气温概率密度分布均向高温方向偏移,其中最低气温偏移最为明显,并导致1962—2011年整个分析时期最低气温分布出现非正态性;城市化对石家庄站气温分布的影响在冬、春季比夏、秋季更显著,最显著的城市化影响出现在冬季最低气温上;石家庄站基于最低气温的极端气温指数趋势受城市化影响严重,冷夜日数和暖夜日数的城市化影响分别为-1.13d/10a、1.48d/10a,但基于最高气温的冷昼和暖昼日数等极端气温指数变化趋势受城市化影响不明显.出现这种现象的主要原因是城市化对最低、最高气温分布的影响存在差异.

关键词：气候变化城市化影响概率密度气温石家庄站

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An overview of studies of observed climate change in the Hindu Kush Himalayan (HKH) region

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Advances in Climate Change Research 2017年第3期8卷 141-147页

作者： YOU Qing-Long ren guo-yu ZHANG yu-Qing ren yu-yu SUN Xiu-Bao ZHAN yun-Jian Arun Bhakta SHRESTHA Raghavan KRISHNAN Key Laboratory of Meteorological Disaster Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) Nanjing University of Information Science Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China Department of Atmospheric Science School of Environmental Studies China University of Geosciences Wuhan 430074 China International Centre for Integrated Mountain Development Kathmandu 3226 Nepal Indian Institute of Tropical Meteorology Pune 411008 India

The Hindu Kush Himalayan (HKH hereafter) region is characterized by mountainous environments and a variety of regional climatic conditions. High-altitude regions in the HKH have the recent warming amplifications, especially during the global warming hiatus period. The rapid warming cause solid state water (snow, ice, glacier, and permafrost) to shrink, leading to increase in meltwater and there have been found more frequent incidences of flash floods, landslides, livestock diseases, and other disasters in the HKH region. Increasing awareness of climate change over the HKH region is reached a consensus. Meanwhile, the HKH region is often referred to as the water towers of Asia as many highaltitude regions store its water in the form of snow and/or glacier, feeding ten major large rivers in Asia. Therefore, the impacts of climate change on water availability in these river basins have huge influences on the livelihood of large number of population, especially in downstream regions. However, the scarcity of basic hydro-meteorological observations particularly in high-altitude regions of HKH limits rigorous analysis of climate change. Most studies used reanalysis data and/or model-reconstructed products to explore the spatial and temporal characteristics of hydro-meteorological processes, especially for extreme events. In this study, we review recent climate change in the HKH region, and the scientific challenges and research recommendations are suggested for this high-altitude area.

关键词： Climate change Hindu Kush Himalayan Tibetan Plateau Hydrological cycles

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