Global Ecology Group
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About our group

Our research is motivated by the compelling need to understand the impacts of climate change and human activities on the Earth’s biosphere and the feedbacks to the climate. We strive to answer major science questions on global carbon/water cycles, climate-vegetation interactions, ecosystem dynamics, and coupled natural and human systems. We combine terrestrial biosphere modeling, remote sensing, field measurements, upscaling, model-data fusion, and statistical analysis to answer these science questions.

Contact:

Dr. Jingfeng Xiao, Research Professor

E-mail: j.xiao at unh dot edu

Update in August, 2022:

We gap-filled, partitioned flux data for nearly 300 AmeriFlux and NEON sites. The gaps of the meteorological data were filled with ERA5-Land reanalysis data, and the flux measurements were gap-filled and partitioned using standardized procedures. The data cover the period from the early 1990s to 2021. If you are interested in using the data, feel free to contact the PI.

Update on April 29, 2022:

Our global, 0.05-deg SIF and GPP products (GOSIF & GOSIF GPP) have been extended to 2021. Both products are now available for 2000-2021.

Highlights on recent papers: (* indicates advisees)

Li, X.*, Xiao, J. (2022) TROPOMI observations allow for robust exploration of the relationship between solar-induced chlorophyll fluorescence and terrestrial gross primary production. Remote Sensing of Environment, 268, 112748. https://doi.org/10.1016/j.rse.2021.112748. [PDF]

Xiao, J., Fisher, J.B., Hashimoto, H., Ichii, K., Parazoo, N.C. (2021) Emerging satellite observations for diurnal cycling of ecosystem processes. Nature Plants. https://doi.org/10.1038/s41477-021-00952-8. [PDF] [view-only version]

Chang, Y.*, Xiao, J., Li, X., Middel, A., Zhang, Y., Gu, Z., Wu, Y., He, S. (2021) Exploring diurnal thermal variations in urban local climate zones with ECOSTRESS land surface temperature data. Remote Sensing of Environment, 263, 112544. https://doi.org/10.1016/j.rse.2021.112544. [PDF] (Highlighted by LP DAAC, USGS)

Li, X.*, Xiao, J., Fisher, J.B., Baldocchi, D.D. (2021) ECOSTRESS estimates gross primary production with fine spatial resolution for different times of day from the International Space Station. Remote Sensing of Environment, 258, 112360. https://doi.org/10.1016/j.rse.2021.112360. [PDF]

Chang, Y.*, Xiao, J., Li, X., Frolking, S., Zhou, D., Schneider, A., Weng, Q., Yu, P., Wang, X., Li, X., Liu, S., Wu, Y. (2021) Exploring diurnal cycles of surface urban heat island intensity in Boston with land surface temperature data derived from GOES-R geostationary satellites. Science of the Total Environment, 763, 144224. https://doi.org/10.1016/j.scitotenv.2020.144224. [PDF]

 

Group news:

2022:

November:

A new postdoctoral research scientist, Henrique Duarte, joined our group. He will simulate future forest ecosystem dynamics for the eastern U.S. Henrique will work closely with scientists at the Forest Service: Ge Sun, Steve McNulty, John Kim.

October:

Jingfeng gave a talk on elucidating the relationship between solar-induced fluorescence and gross primary production with TROPOMI data at the USCCC Annual Meeting.

Jingfeng gave a talk on towards benchmarking and improving Earth System Models on the UNH-DOE National Lab Day.

A new postdoctoral research scientist, Jingyi Bu, joined our group. She will study ecosystem functioning and processes with state-of-the-art satellite data.

August:

Erin presented our new results on impacts of structural and biological diversity on aboveground carbon storage in temperate forests based on GEDI and forest inventory data at the ESA and CSEE Joint Meeting in Montreal, Canada.

We gap-filled, partitioned flux data for nearly 300 AmeriFlux and NEON sites. The gaps of the meteorological data were filled with ERA5-Land reanalysis data, and the flux measurements were gap-filled and partitioned using standardized procedures. The data cover the period from the early 1990s to 2021. If you are interested in using the data, feel free to contact the PI.

Jingfeng gave an invited seminar on Remote Sensing of Diurnal Variations in Ecosystem Processes at Department of Earth and Environmental Science, Xi'an Jiaotong University.

May:

Our new paper led by Dr. Baolin Xue is published in Water Resources Research: Divergent hydrological responses to forest expansion in dry and wet basins of China: Implications for future afforestation planning. [PDF]

Our new paper led by Dr. Decheng Zhou is published in Earth's Future: Urbanization contributes little to global warming but substantially intensifies local and regional land surface warming. [PDF]

April:

Jingfeng gave an invited seminar on understanding photosynthesis from ecosystems to the globe at Department of Civil and Environmental Engineering, University of Connecticut on April 15, 2022.

February:

Yue's new paper came out today. We combined data from GOES-R and ECOSTRESS to explore the diurnal variations of surface urban heat island and thermal differentiation among various land covers over the Boston Metropolitan Area. Both GOES-R and ECOSTRESS have diurnal sampling capability. We take advantage of the strengths of the geostationary satellite (high-frequency observations within each day/night) and ECOSTRESS (high spatial resolution). [PDF]

Our new paper is published in Science of the Total Environment. Our findings show that daytime and nighttime warming has no opposite effects on vegetation phenology and productivity in the northern hemisphere, and properly dealing with the multicollinearity problem is critical for understanding the effects of asymmetric warming on vegetation activity.

January:

Our global, fine-resolution SIF (GOSIF) and GPP (GOSIF GPP) products released in 2019 have been used by numerous scientists around the world and have led to ~60 journal articles to date. These articles are on various topics such as productivity, carbon cycle, phenology, drought, and model evaluation.

 

More news

 

Prospective graduate students and postdocs (and visiting students or scholars):

Our group may have positions open for highly-motivated and productive graduate students or postdocs. Please contact me if you are interested. We also host highly-motivated visiting students or scholars.

Special issues:

Vegetation monitoring with geostationary satellite observations, Remote Sensing of Environment, Guest Editors: Benjamin Dechant, Paul Stoy, Kazuhito Ichii, Jingfeng Xiao, Weile Wang

 

Carbon flux, water use and surface energy balance of forest plantations, Agricultural and Forest Meteorology, Guest Editors: Xiaojuan Tong, Jingfeng Xiao, M. Altaf Arain

 

Impacts of Extreme Climate Events and Disturbances on Carbon Dynamics, Biogeosciences, Guest Editors: J. Xiao, S. Liu, P. Stoy

 

Advances in Upscaling of Eddy Covariance Measurements of Carbon and Water Fluxes, Journal of Geophysical Research - Biogeosciences, Guest Editors: J. Xiao, K.J. Davis, M. Reichestein, J.Chen