Member of the Norwegian Academy of Science and Letters. Member of Norwegian Academy of Technological Sciences. His fields of interest and present research activities focus on Hydrological modelling at global, regional and catchment scales; Regional evapotranspiration and its role in linking climatic and hydrological system; Hydrological impact of climate and environment changes at global, regional and catchment scales, Uncertainty analysis and time series analysis. He has been awarded WMO Research Awards for Young Scientists, and Outstanding Overseas Chinese Scholars Awards, etc. He is currently the Editor for international journal of “Hydrology Research”, and Associate Editor of several journals including “Journal of Hydrology”. He is an author of more than 250 SCI Journal papers, of which more than 50 papers were published in “Journal of Hydrology” the top journal in the discipline, with an h- index of 53 in the Web of Science Citation Report, an h-index of 66 in Google Scholar. He received Web of Science Highly Cited Researcher Award in 2017. He is an Expert reviewer of IPCC WG-I AR5 report and expert reviewer of IPCC WG II AR5 report.