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Chuixiang (Tree) Yi Professor & Fulbright Scholar PhD Faculty in EES Program at GC/CUNY PhD Faculty in Physics Program at GC/CUNY School of Earth and Environmental Sciences Queens College, City University of New York (CUNY) Phone: (718) 997-3366         E-mail: cyi@qc.cuny.edu @cyi12 CV

Professor Chuixiang (Tree) Yi Principal Investigator	Chuixiang Yi is Professor at Queens College of the City University of New York. Previously, he was Associate Professor at Beijing Normal University. Yi holds a Ph.D. in atmospheric sciences from Nanjing University and held post-doctoral positions in boundary-layer meteorology, micrometeorology, and biosphere-atmosphere interactions at the UC-Berkeley, U -Minnesota, Penn-State U, and U -Colorado.  His research has focused on canopy fluid mechanics including developing theoretical formulations, designing observations, and performing numerical simulations to understand the physical, biological, and chemical processes that control the exchange of trace gas between the vegetation and the atmosphere. Yi was a leading recipient of World Meteorological Organization Norbert-Gerbier-MUMM International Award in 2012. Yi was a Rossby Fellow from International Meteorological Institute at Stockholm University during 2014 – 2015. Yi is currently a Fulbright Visiting Professor at University of Innsbruck in 2022. His Lab has a broad spectrum of research projects across Forest Ecology, Remote Sensing, Micrometeorology, Climate Change, Paleoclimate, and Hydrology. The overall goal of his team is to use nonlinear system theory, stability analysis approach, resilience, and tipping point concepts to predict potential critical transitions of nature and society in facing extremes induced by the warming climate.
Distinguished Professor George Hendrey Principal Investigator	Forest-atmosphere CO2 exchange: Estimating net primary production via the eddy covariance flux method does not work well in hilly to mountainous terrain. Chuixiang Yi and I are setting up an experiment in the Black Rock Forest where we intend to develop methods to improve the use of eddy-flux to estimate NPP in complex terrain. We are establishing a suite of instrumented eddy-flux towers over a single hill for micrometeorological research on advective flux.        CO2 absorption: An expanding area of interest for me is how inorganic substances react with atmospheric CO2. I have established an apparatus for studying such reactions and their associated kinetics.        Plant responses to CO2 enrichment: Much of what is known about global ecosystem responses to future increases in atmospheric CO2 has been gained through Free-Air CO2 Enrichment (FACE) experiments of my design. All FACE experiments exhibit rapid variations in CO2 concentrations on the order of seconds to minutes. I have shown that long-term photosynthesis can be reduced as a consequence of this variability. Because of this, all FACE experiments tend to underestimate ecosystem net primary production (NPP) associated with a presumed increased concentration of CO2. I am working on development of a NPP correction based on photosynthesis experiments in which CO2 is oscillated in a controlled way in a leaf chamber while measuring photosynthetic fluorescence and/or CO2 assimilation.
Professor Nir Krakauer Collaborator https://nirkrakauer.net/	I study the earth's water and carbon cycles, particularly the effects of global warming and other human impacts. My projects involve monitoring water resources, droughts and floods from earth-observing satellites as well as using ground observations, computer models, and geospatial and statistics tools to learn about hazards and obtain new insights.
Professor Wei Fang Collaborator Pace University	My long-term research interests lie in the understanding of organismal and ecosystem resilience and responses to anthropogenic changes, including urbanization, warming, and biological invasion.  The global dominance of humans in almost all ecosystems not only makes the research of practical importance, but also necessitates paradigm shifts in how we conduct research to maximize societal benefits.  Specifically, I am studying the distribution, diversity, and impact of exotic invasive species in urban forests and the Hudson River estuarine of New York, and the resilience of forest communities in southwest US and the Mediterranean area to warming and drought. I am also studying the adaptive plasticity of African cichlids in Lake Tanganyika in response to urbanization and algal blooms, integrating molecular biology, field ecology and GIS approaches. My overall objective is to develop an understanding of adaptive responses of organisms and ecosystems under global anthropogenic changes across spatial and temporal scales for better sustainability.
Professor Zhenkun Tian Collaborator	I am interested in understanding carbon cycle in regional/global scale by using statistical models, process models, or machine learning models based on the observed/remote sensed data in the context of climate change. I am also interested in exploring LUCC, land surface parameters estimation, vegetation growth, etc. to learn about the anthropogenic impact on earth environment by using GIS, RS, and data mining technology.
Dr. Eric Kutter Collaborator	I continue analyzing observed data for recirculation by two-tower system in Black-Rock Forest and writing a book chapter together with Dr. Tree about mountain winds.
Former PhD Students Dr. Xiyan Xu Received PhD in 2014 Dissertation Title: Numerical Study of Canopy Flows in Complex Terrain Currently Research Scientist at Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China Dr. Suhua (Sue) Wei Received Ph. D. in 2018 Dissertation Title: Impacts of Climate Extremes on Terrestrial Productivity Currently working for the Amazon Dr. Christine Ramadhin Received Ph. D. in 2019 Dissertation Title: Abrupt Climate Transitions Dr. Eric Kutter Received Ph.D. in 2019 Dissertation Title:  Wind Flow Dynamics over Complex Terrain Former visiting PhD Students Qin Zhang Visiting Ph.D. Candidate Hui Luo Visiting Ph.D. Candidate Dr. Kaicheng Huang Visiting Ph.D. Student (2013-2014) Huang, K., C. Yi, D. Wu, T. Zhou, X. Zhao, W. J. Blanford, S. Wei, H. Wu, D. Ling, and Z. Li, Tipping point of a conifer forest ecosystem under severe drought, Environ. Res. Lett. 10 024011 doi:10.1088/1748-9326/10/2/024011 (2015). Perspective Highlights Dr. Shan Gao Visiting Ph.D. Student (2016-2017) Gao, S., R. Liu, T. Zhou, W. Fang, C. Yi, R. Lu, X. Zhao, H. Luo, Dynamic responses of tree-ring growth to multiple dimensions of drought, Global Change Biology, DOI:10.1111/gcb.14367 (2018). PDF Gao, S., T. Zhou, C. Yi, P. Shi, W. Fang, R. Liu, E. Liang, J. J. Camareroh, Asymmetric impacts of dryness and wetness on tree growth and forest coverage, Agric. Forest Meteorol., 288–289, 2020, 107980, https://doi.org/10.1016/j.agrformet.2020.107980. PDF Dr. Peipei (Peter) Xu Visiting Ph.D. Student (2017-2018) Xu, P., T. Zhou, C. Yi, W. Fang, G. Hendrey, and X. Zhao, Forest drought resistance distinguished by canopy height, Environ. Res. Lett. 13 (2018) 075003 (2018). PDF News Xu, P., T. Zhou, C. Yi, H. Luo, X. Zhao, W. Fang, S. Gao, X. Liu, Impacts of Water Stress on Forest Recovery and Its Interaction with Canopy Height, Int. J. Environ. Res. Public Health, 15, 1257; doi:10.3390/ijerph15061257 (2018). PDF Dr. Zhiwen Luo Visiting Ph.D. Student (2009) Currently faculty member at University of Reading in U.K. Former visiting Professors Dr. Zhenkun Tian Visiting Professor (2018-2019) Dr. Shoichi (Show) Furuyama Visiting Professor (2014) Former Postdoctoral Researchers Dr. Wei (Francina) Fang Research Associate (2016-2020) Currently Assistant Professor at Pace University Dr. Hongbin Chen Postdoctoral Fellow (2010-2011) Currently Associate Professor at Huaqiao University in China Former Master Students Derek Mu Master Student (2014-2017) Dr. Caroline Farkas Master Student ( 2009 - 2011) Currently Research Scientist at EPA Former Undergraduate Students & Research Assistants Michelle Park Undergraduate Student (2019-2020) Jacqueline Singer Undergraduate Student (2020-2021) Lexi Christensen Undergraduate Student (2019-2020) Natascha Hey Undergraduate Student (2019-2020) Silvio Aldebot Undergraduate Student (2017-2018) Xue (Shirley) Weng Graduate student (2020) Francesca King Graduate Student (2020) Alex Andronikides Undergraduate Student (2019-2020) Joel Dhaness Undergraduate Student (2019) Spencer Gould Graduate Student (2019) Ayo Andra J. Deas Research Assistant Volunteer (2017-2018) Currently Ph.D. Student in Earth and Environmental Sciences at the CUNY Graduate Center Sara Abedi Ph.D. Student in Physics (Lab rotation in 2018) Daniel Matt Wiener Graduate Student (2017) Ashley Isaccs Undergraduate Student (2017-2018) Yunmee Han Undergraduate Student (2017) Jessica Rosenberg Ph.D. Student in physics (Lab rotation in 2018) Qianyu Zhang Research Technician (2012-2013) Alan Mason Graduate Student (2011-2012) Staff Scientist in Langan Engineering & Environmental Services, Inc. David Kim   Undergraduate Student Daniel Baruch Undergraduate Student (2016) Mike Taubman Undergraduate Student (2013-2014) Anand Dookie Undergraduate Student (2010-2013) Max Trukhin Undergraduate Student (2013) Lili Ye Undergraduate Student (2013) Kevin Clinton Undergraduate Student (2012-2013) Kailin (Pepper) Kuo Undergraduate Student (2010) Former High School Students Nathan Jackson (2018 summer and 2019 summer) High School Student Max Wang High School Student (2010-2012) Chun Wu High School Student (2011-2012) Hugh Han High School Student (2013) Einstein and Bohr