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Dive into the research topics where Wenjian Hua is active.

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Featured researches published by Wenjian Hua.


Climate Dynamics | 2017

On the coupling between precipitation and potential evapotranspiration: contributions to decadal drought anomalies in the Southwest China

Shanlei Sun; Haishan Chen; Weimin Ju; Guojie Wang; Ge Sun; Jin Huang; Hedi Ma; Chujie Gao; Wenjian Hua; Guixia Yan

Under the exacerbation of climate change, climate extreme events, especially for drought, happened frequently and intensively across the globe with greater spatial differences. We used the Standardized Precipitation-Evapotranspiration Index computed from the routine meteorological observations at 269 sites in Southwest China (SWC) to study the drought characteristics (e.g., extent, duration and intensity) and their decadal variations during 1971–2012. It was revealed that the drought, in responses to the coupling between decadal precipitation and potential evapotranspiration (PET) anomalies, differed among regions and periods. For the entire SWC, droughts in 1970s and 2000s+ was generally stronger than in 1980s and 1990s with respect to their spatial extent, duration and intensity, especially in 2000s+. It was well-known that drought was closely related with a lack of precipitation; however, the impact of atmospheric demand of evaporation (reflected by PET here) on drought (e.g., duration and intensity) was rarely paid enough attentions. To that end, a spatial multi-linear regression approach was proposed in this study for quantifying the contributions of decadal PET and precipitation variations to drought duration and intensity. We have found that the contributions of decadal PET anomalies to drought duration and intensity could exceed those of precipitation, e.g., during 1980s and 1990s in SWC. Additionally, despite the strongest droughts in 2000s+, it was suggested that PET could exert comparable impacts on drought anomalies as precipitation. All these findings implied that PET plays a critical role in drought event, which acts to amplify drought duration and intensity. To sum up, this study stressed the need for enough attentions for PET processes in drought studies.


Climate Dynamics | 2016

Mechanisms for stronger warming over drier ecoregions observed since 1979

Liming Zhou; Haishan Chen; Wenjian Hua; Yongjiu Dai; Nan Wei

Previous research found that the warming rate observed for the period 1979–2012 increases dramatically with decreasing vegetation greenness over land between 50°S and 50°N, with the strongest warming rate seen over the driest regions such as the Sahara desert and the Arabian Peninsula, suggesting warming amplification over deserts. To further this finding, this paper explores possible mechanisms for this amplification by analyzing observations, reanalysis data and historical simulations of global coupled atmosphere–ocean general circulation models. We examine various variables, related to surface radiative forcing, land surface properties, and surface energy and radiation budget, that control the warming patterns in terms of large-scale ecoregions. Our results indicate that desert amplification is likely attributable primarily to enhanced longwave radiative forcing associated with a stronger water vapor feedback over drier ecoregions in response to the positive global-scale greenhouse gas forcing. This warming amplification and associated downward longwave radiation at the surface are reproduced by historical simulations with anthropogenic and natural forcings, but are absent if only natural forcings are considered, pointing to new potential fingerprints of anthropogenic warming. These results suggest a fundamental pattern of global warming over land that depend on the dryness of ecosystems in mid- and low- latitudes, likely reflecting primarily the first order large-scale thermodynamic component of global warming linked to changes in the water and energy cycles over different ecosystems. This finding may have important implications in interpreting global warming patterns and assessing climate change impacts.


Journal of Hydrometeorology | 2017

Attributing the Changes in Reference Evapotranspiration in Southwestern China Using a New Separation Method

Shanlei Sun; Haishan Chen; Ge Sun; Weimin Ju; Guojie Wang; Xing Li; Guixia Yan; Chujie Gao; Jin Huang; Fangmin Zhang; Siguang Zhu; Wenjian Hua

AbstractThis study investigated monthly and annual reference evapotranspiration changes over southwestern China (SWC) from 1960 to 2012, using the Food and Agriculture Organization of the United Nations’ report 56 (FAO-56) Penman–Monteith equation and routine meteorological observations at 269 weather sites. During 1960–2012, the monthly and annual decreased at most sites. Moreover, the SWC regional average trend in annual was significantly negative (p < 0.05); this trend was the same in most months. A new separation method using several numerical experiments was proposed to quantify each driving factor’s contribution to changes and exhibited higher accuracy based on several validation criteria, after which an attribution analysis was performed. Across SWC, the declining annual was mainly due to decreased net radiation (RN). Spatially, the annual changes at most sites in eastern SWC (excluding southeastern West Guangxi) were generally due to RN, whereas wind speed (WND) or vapor pressure deficit (VPD) was...


Scientific Reports | 2017

Observational Evidence for Desert Amplification Using Multiple Satellite Datasets

Nan Wei; Liming Zhou; Yongjiu Dai; Geng Xia; Wenjian Hua

Desert amplification identified in recent studies has large uncertainties due to data paucity over remote deserts. Here we present observational evidence using multiple satellite-derived datasets that desert amplification is a real large-scale pattern of warming mode in near surface and low-tropospheric temperatures. Trend analyses of three long-term temperature products consistently confirm that near-surface warming is generally strongest over the driest climate regions and this spatial pattern of warming maximizes near the surface, gradually decays with height, and disappears in the upper troposphere. Short-term anomaly analyses show a strong spatial and temporal coupling of changes in temperatures, water vapor and downward longwave radiation (DLR), indicating that the large increase in DLR drives primarily near surface warming and is tightly associated with increasing water vapor over deserts. Atmospheric soundings of temperature and water vapor anomalies support the results of the long-term temperature trend analysis and suggest that desert amplification is due to comparable warming and moistening effects of the troposphere. Likely, desert amplification results from the strongest water vapor feedbacks near the surface over the driest deserts, where the air is very sensitive to changes in water vapor and thus efficient in enhancing the longwave greenhouse effect in a warming climate.


Journal of Hydrology | 2014

On the attribution of the changing hydrological cycle in Poyang Lake Basin, China

Shanlei Sun; Haishan Chen; Weimin Ju; Miao Yu; Wenjian Hua; Yi Yin


Climate Dynamics | 2016

Large-scale urbanization effects on eastern Asian summer monsooncirculation and climate

Haishan Chen; Ye Zhang; Miao Yu; Wenjian Hua; Shanlei Sun; Xing Li; Chujie Gao


Theoretical and Applied Climatology | 2014

Uncertainty in land surface temperature simulation over China by CMIP3/CMIP5 models

Wenjian Hua; Haishan Chen; Shanlei Sun


International Journal of Climatology | 2013

Assessing the future hydrological cycle in the Xinjiang Basin, China, using a multi-model ensemble and SWAT model

Shanlei Sun; Haishan Chen; Weimin Ju; Wenjian Hua; Miao Yu; Yixing Yin


Chinese Science Bulletin | 2013

Hotspots of the sensitivity of the land surface hydrological cycle to climate change

Wenjian Hua; Haishan Chen; Siguang Zhu; Shanlei Sun; Miao Yu; Liming Zhou


Natural Hazards | 2018

A potential predictor of multi-season droughts in Southwest China: soil moisture and its memory

Chujie Gao; Haishan Chen; Shanlei Sun; Victor Ongoma; Wenjian Hua; Hedi Ma; Bei Xu; Yang Li

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Haishan Chen

Nanjing University of Information Science and Technology

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Shanlei Sun

Nanjing University of Information Science and Technology

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Chujie Gao

Nanjing University of Information Science and Technology

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Miao Yu

Nanjing University of Information Science and Technology

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Xing Li

Nanjing University of Information Science and Technology

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Guojie Wang

Nanjing University of Information Science and Technology

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Hedi Ma

Nanjing University of Information Science and Technology

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Jin Huang

Nanjing University of Information Science and Technology

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Siguang Zhu

Beijing Normal University

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Ge Sun

United States Department of Agriculture

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