Zexuan Xu is a hydrology postdoctoral researcher at Climate & Ecosystem Sciences Division (CESD), Lawrence Berkeley National Laboratory (LBNL). Before joining Berkeley Lab, Zexuan received his PhD degree in hydrology and groundwater modeling at Florida State University (FSU). His PhD dissertation is “Data analysis and numerical modeling of seawater intrusion through conduit network in a coastal karst aquifer”. Currently, Zexuan is working with Drs. Bill Collins and Hans Johansen on a LDRD project “Modeling the Earth’s hydrological cycle from watershed to global scales.” His research includes development, testing and applications of integrated atmosphere, land surface and hydrology numerical models. The responses of water resources, such as streamflow and groundwater levels, to atmosphere processes, land cover changes and human factors are investigated. The ultimate goal of his study is to provide a better understanding of the relationship between hydrological processes and climate change.