Time filter

Source Type

Sun S.L.,Nanjing University of Information Science and Technology | Chen H.S.,Nanjing University of Information Science and Technology | Ju W.M.,Nanjing University | Song J.,Northern Illinois University | And 2 more authors.
Hydrology and Earth System Sciences | Year: 2012

To understand the causes of the past water cycle variations and the influence of climate variability on the streamflow, lake storage, and flood potential, we analyze the changes in streamflow and the underlying drivers in four typical watersheds (Gaosha, Meigang, Saitang, and Xiashan) within the Poyang Lake Basin, based on the meteorological observations at 79 weather stations, and datasets of streamflow and river level at four hydrological stations for the period of 1961-2000. The contribution of different climate factors to the change in streamflow in each watershed is estimated quantitatively using the water balance equations. Results show that in each watershed, the annual streamflow exhibits an increasing trend from 1961-2000. The increases in streamflow by 4.80 m3 sĝ̂'1 yrĝ̂'1 and 1.29 m3 sĝ̂'1 yrĝ̂'1 at Meigang and Gaosha, respectively, are statistically significant at the 5% level. The increase in precipitation is the biggest contributor to the streamflow increment in Meigang (3.79 m3 sĝ̂'1 yrĝ̂'1), Gaosha (1.12 m3 sĝ̂'1 yrĝ̂'1), and Xiashan (1.34 m3 sĝ̂'1 yrĝ̂'1), while the decrease in evapotranspiration is the major factor controlling the streamflow increment in Saitang (0.19 m3 sĝ̂'1 yrĝ̂'1). In addition, radiation and wind contribute more than actual vapor pressure and mean temperature to the changes in evapotranspiration and streamflow for the four watersheds.

For revealing the possible change of streamflow due to the future climate change, we also investigate the projected precipitation and evapotranspiration from of the Coupled Model Intercomparison Project phase 3 (CMIP3) under three greenhouse gases emission scenarios (SRESA1B, SRESA2 and SRESB1) for the period of 2061-2100. When the future changes in the soil water storage changes are assumed ignorable, the streamflow shows an uptrend with the projected increases in both precipitation and evapotranspiration (except for the SRESB1 scenario in Xiashan watershed) relative to the observed mean during 1961-2000. Furthermore, the largest increase in the streamflow is found at Meigang (+4.31%) and Xiashan (+3.84%) under the SRESA1B scenario, while the increases will occur at Saitang (+6.87%) and Gaosha (+5.15%) under the SRESB1 scenario. © Author(s) 2012. CC Attribution 3.0 License.

Sun S.,Nanjing University of Information Science and Technology | Chen H.,Nanjing University of Information Science and Technology | Ju W.,Nanjing University | Song J.,Northern Illinois University | And 3 more authors.
Theoretical and Applied Climatology | Year: 2013

Hydrological processes depend directly on climate conditions [e. g., precipitation, potential evapotranspiration (PE)] based on the water balance. This paper examines streamflow datasets at four hydrological stations and meteorological observations at 79 weather stations to reveal the streamflow changes and underlying drivers in four typical watersheds (Meigang, Saitang, Gaosha, and Xiashan) within Poyang Lake Basin from 1961 to 2000. Most of the less than 90th percentile of daily streamflow in each watershed increases significantly at different rates. As an important indicator of the seasonal changes in the streamflow, CT (the timing of the mass center of the streamflow) in each watershed shows a negligible change. The annual streamflow in each watershed increases at different rates, with a statistically significant trend (at the 5 % level) of 9.87 and 7.72 mm year-1, respectively, in Meigang and Gaosha watersheds. Given the existence of interactions between precipitation and PE, the original climate elasticity of streamflow can not reflect the relationship of streamflow with precipitation and PE effectively. We modify this method and find the modified climate elasticity to be more accurate and reasonable using the correlation analysis. The analyses from the modified climate elasticity in the four watersheds show that a 10 % increase (decrease) in precipitation will increase (decrease) the annual streamflow by 14.1-16.3 %, while a 10 % increase (decrease) in PE will decrease (increase) the annual streamflow by -10.2 to -2.1 %. In addition, the modified climate elasticity is applied to estimate the contribution of annual precipitation and PE to the increasing annual streamflow in each watershed over the past 40 years. Our result suggests that the percentage attribution of the increasing precipitation is more than 59 % and the decreasing in PE is less than 41 %, indicating that the increasing precipitation is the major driving factor for the annual streamflow increase for each watershed. © 2012 Springer-Verlag.

Jiang Z.,Nanjing University of Information Science and Technology | Shen Y.,Nanjing University of Information Science and Technology | Ma T.,Nanjing University of Information Science and Technology | Zhai P.,Nanjing University of Information Science and Technology | And 3 more authors.
Journal of Meteorological Research | Year: 2014

The spectral characteristics of precipitation intensity during warm and cold years are compared in six regions of China based on precipitation data at 404 meteorological stations during 1961–2006. In all of the studied regions except North China, with the increasing temperature, a decreasing trend is observed in light precipitation and the number of light precipitation days, while an increasing trend appears in heavy precipitation and the heavy precipitation days. Although changes in precipitation days in North China are similar to the changes in the other five regions, heavy precipitation decreases with the increasing temperature in this region. These results indicate that in most parts of China, the amount of precipitation and number of precipitation days have shifted towards heavy precipitation under the background of a warming climate; however, the responses of precipitation distributions to global warming differ from place to place. The number of light precipitation days decreases in the warm and humid regions of China (Jianghuai region, South China, and Southwest China), while the increasing amplitude of heavy precipitation and the number of heavy precipitation days are greater in the warm and humid regions of China than that in the northern regions (North China, Northwest China, and Northeast China). In addition, changes are much more obvious in winter than in summer, indicating that the changes in the precipitation frequency are more affected by the increasing temperature during winter than summer. The shape and scale parameters of the Γ distribution of daily precipitation at most stations of China have increased under the background of global warming. The scale parameter changes are smaller than the shape parameter changes in all regions except Northwest China. This suggests that daily precipitation shifts toward heavy precipitation in China under the warming climate. The number of extreme precipitation events increases slightly, indicating that changes in the Γ distribution fitting parameters reflect changes in the regional precipitation distribution structure. © The Chinese Meteorological Society and Springer-Verlag Berlin Heidelberg 2014.

PubMed | Chinese Academy of Sciences, Wuhan Regional Climate Center, Wuhan University of Science and Technology and Centers for Disease Control and Prevention
Type: Journal Article | Journal: Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi | Year: 2016

To understand the influence of meteorological factors on Oncomelania density in natural condition and provide scientific evidence for the control of the spread of schistosomiasis and Oncomelania.Based on the Oncomelania survey data in spring and ground meteorological observation data of Qianjiang from 1990 to 2014, the first-order autoregressive analysis method was used for trend fitting and disassemble, and the correlation between the change rate of Oncomelania density and various meteorological factors in different periods were analyzed.The greatest influence of meteorological factors on Oncomelania density was temperature, followed by precipitation. The average minimum temperature in January and from December to February had predominant influence on Oncomelania density and frame occurrence rate of living Oncomelania (FORLO) respectively. The rise (fall) of average minimum temperature in January by 1 C would lead to the increase (decrease) of Oncomelania density by 5.080%-6.710%; The rise (fall) of average minimum temperature from December to February by 1 C would lead to the increase (decrease) of FORLO by 15.521%-15.928%. The period with the biggest influence of precipitation on Oncomelania density was from November to April, as the rainfall declined >20%, drought might occur, which would cause the reduction of Oncomelania density. Sunshine from September to November had some correlations with the change of Oncomelania density and FORLO. Statistical regression models for the change of Oncomelania density, FORLO and meteorological factors based on correlation analysis were established respectively.Weed removal in Oncomelania areas before December is beneficial to reduce the surface temperature and soil moisture content, which would result in Oncomelania density reduction in some extent. It s notable that the winter temperature is in rise in Hubei province along with global climate change, causing the Oncomelania density to increase, to which more attention should be paid.

PubMed | Centers for Disease Control and Prevention, Shenzhen University, Wuhan University of Science and Technology, Beijing Jiaotong University and 3 more.
Type: | Journal: Environment international | Year: 2016

Health effects of exposure to particulate matter (PM) on male reproductive health remain unclear. Only a limited number of studies have investigated the effects of PMTo quantitatively assess the exposure-response association between PM exposure and semen quality in Chinese men who were exposed to a wide concentration range of PM.We investigated 1759 men from Wuhan, China, who were partners of women undergoing assisted reproductive technology procedures, and had semen examined at least once between 2013 and 2015. Individual PMPMOur results suggest that ambient PM exposure during sperm development adversely affects semen quality, in particular sperm concentration and count.

Wu J.,National Climate Center | Gao X.,National Climate Center | Giorgi F.,Abdus Salam International Center For Theoretical Physics | Chen Z.,Wuhan Regional Climate Center | Yu D.,Yichang Meteorological Bureau
Quaternary International | Year: 2012

High resolution multi-annual regional climate model (RegCM3) experiments were performed to simulate the effects of the Three Gorges Reservoir (TGR) on the climate of the surrounding areas. The model was run in double nested mode. Firstly a 50 km resolution simulation was conducted over the China domain driven by the coarse resolution NCEP/NCAR re-analysis. Then the output of the simulation was used to drive the model over the Three Gorges Area (TGA) at a resolution of 10 km. SUB-BATS scheme was employed in the 10 km simulation to represent the land surface at 2 km. Two 10 km simulation, one with and the other without the inland water in TGR were conducted. Comparison of the simulations against observation were firstly carried out to validation the model performances over TGA. The 10 km sensitivity experiments with and without the TGR showed that little or negligible effects can be found except directly over the TGR. Most of the simulated effects are noisy and not statistically significant, except for cooling over the TGR water body in both June-July-August (JJA) and December-January-February (DJF). The cooling leads to an/a insignificant decrease/slight decrease of precipitation over the TGR and nearby grid points, respectively. The cooling is larger in JJA compared to DJF. As a typical river-like reservoir, the width and coverage of the TGR does not have significant influence on the local climate over the area. © 2012 Elsevier Ltd and INQUA.

Zhou X.-Y.,Chinese Academy of Meteorological Sciences | Zhou X.-Y.,National Climate Center | Zhang C.-Y.,National Climate Center | Guo G.-F.,Wuhan Regional Climate Center
Chinese Journal of Applied Ecology | Year: 2010

Forest soil organic carbon is an important component of global carbon cycle, and the changes of its accumulation and decomposition directly affect terrestrial ecosystem carbon storage and global carbon balance. Climate change would affect the photosynthesis of forest vegetation and the decomposition and transformation of forest soil organic carbon, and further, affect the storage and dynamics of organic carbon in forest soils. Temperature, precipitation, atmospheric CO2 concentration, and other climatic factors all have important influences on the forest soil organic carbon storage. Understanding the effects of climate change on this storage is helpful to the scientific management of forest carbon sink, and to the feasible options for climate change mitigation. This paper summarized the research progress about the distribution of organic carbon storage in forest soils, and the effects of elevated temperature, precipitation change, and elevated atmospheric CO2 concentration on this storage, with the further research subjects discussed.

Lv W.,Wuhan Regional Climate Center | Wang Y.,Hubei University | Querol X.,CSIC - Institute of Earth Sciences Jaume Almera
Chemical Engineering III - Proceedings of the 3rd SREE Conference on Chemical Engineering, CCE 2013 | Year: 2014

A study on PM2.5was conducted in a metropolis in Central China from July 2006 to July 2007 that acquired 24h mass and chemical composition every sixth day at three sites, one industrial, one urban and one urban-industrial site. The PM2.5samples were pre-treated and both inorganic and organic compounds were measured. The levels, seasonal and spatial patterns and detailed chemical characterizations of major constituents were identified. This study will help better understand the causes and reduction strategies for PM2.5 in Central China.

Yin X.,Changjiang Geotechnical Engineering Corporation | Lv W.,Wuhan Regional Climate Center | Xie L.,Changjiang Geotechnical Engineering Corporation
ICPTT 2013: Trenchless Technology - The Best Choice for Underground Pipeline Construction and Renewal, Proceedings of the International Conference on Pipelines and Trenchless Technology | Year: 2013

A natural gas pipeline in Yangtze River Tunnel was constructed via shield method. When shield machine entered reception shaft, groundwater inflow and sand inflow occurred in the tunnel, which was 10.2 m away from the inner wall of reception shaft and led to segment displacement and ground collapse. Drilling was adopted to probe the shield segment displacement and the drill hole deflection was controlled by means of vertical shaft calibration of drill rigs using perpendicular line, which strictly controlled the accuracy of the probe to determine the displacement of tunnel segments. Segment damage and disturbance was effectively prevented by drilling speed control and blank bit replacement. This detection method with reasonable technology meets the exploration accuracy and attains reliable exploration data so that it can provide a reference for similar engineering problems. © ASCE 2013.

Cai C.,Tobacco Research Institute of Hubei Province | Deng H.,Wuhan Regional Climate Center | Cheng L.,Tobacco Research Institute of Hubei Province | Wang P.,China Tobacco Hubei Industrial Co. | Feng J.,Tobacco Research Institute of Hubei Province
Tobacco Science and Technology | Year: 2015

In order to breed new flue-cured tobacco lines of harmonious chemical composition via scientific and rational parent selection and combination collocation, thirty complete diallel cross combinations were prepared from six flue-cured tobacco varieties with Griffing method (III). The genetic effects of eight chemical component indexes (the contents of nicotine, total nitrogen, total sugar, potassium, chlorine and the ratios of total nitrogen/nicotine, total sugar/ nicotine, potassium/chlorine) in tobacco leaves were preliminarily analyzed. The results showed that the said chemical indexes differed extremely significantly between combinations, the general combining ability (GCA) between parents and the specific combining ability (SCA) between combinations exhibited extremely significantly differences as well. Moreover, the variance of GCA was greater than that of SCA for all the indexes except for the ratio of total nitrogen/ nicotine. It indicated that for most of the chemical indexes investigated in this experiment, parent selection was more important than combination collocation. For GCA effect, cv. RG17 possessed a potential in increasing potassium content and cv. Nanjiang No.3 might increase potassium/chlorine ratio; 6388 lines presented a potential in decreasing chlorine content. Analyzing SCA effect from the point of chemical quality, the combination of K326 ×Nanjiang No.3, Jingyehuang × Nanjiang No.3 and K8 × Jingyehuang were the best, followed by K326 × Jingyehuang and K8×RG17. There existed obvious heritability differences between the traits of chemical indexes. Potassium content and total sugar content possessed the highest and the lowest special heritability of 33.82% and 1.37%, respectively. The general heritability of chlorine content (51.84% ) and potassium content (50.04%) was the highest, while that of total sugar content (15.08%) was the lowest. Only the special heritability of potassium content accounted for over 50% of general heritability, it indicated that the heritability of potassium content mainly was additive effect, which facilitated to the breeding tobacco cultivars of high-potassium content and was suitable to line selection at earlier generation. For the traits of other chemical indexes, it would be preferable to carry out line selection while the trait became stable. ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved.

Loading Wuhan Regional Climate Center collaborators
Loading Wuhan Regional Climate Center collaborators