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

(CV)

E-mail: j dot xiao at unh dot edu

A new postdoc position is NOW open:

We are still looking for applicants for the postdoc position in diurnal cycling of ecosystem functioning. The successful candidate will understand diurnal cycling of ecosystem functioning and explore how water and heat stresses influence ecosystem functioning (photosynthesis, evapotranspiration, water use efficiency) for various ecosystem types over broad regions using observations from new generation satellites (e.g., ECOSTRESS, OCO-3, geostationary satellites), in-situ measurements, and machine learning/modeling. (Job description and how to apply)

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.

Update on November 29, 2021:

The documentation is added for our GIMMS Phenology dataset (1/12-deg resolution; northern hemisphere; 1982-2014).

 

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:

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.

2021:

November:

Xing's paper titled TROPOMI observations allow for robust exploration of the relationship between solar-induced chlorophyll fluorescence and terrestrial gross primary production is published in Remote Sensing of Environment. [PDF]

September:

Jingfeng gave an invited talk at the OCO-2/OCO-3 Science Team Telecon: Studying ecosystem processes with SIF measurements from the OCO missions.

Erin Crockett joined our group as a postdoctoral research scientist and is officially hired via the ORISE program, and he will work with scientists at the Forest Service on a USDA-funded project. Erin got his PhD from McGill University very recently. Welcome, Erin!

August:

We shared our recent research results at the ECOSTRESS Science Team Meeting (virtually).

Jingfeng gave an invited talk on remote sensing of ecosystem processes at Southern Research Station, USDA Forest Service (virtually).

Jingfeng gave a talk at the Asia Oceania Geosciences Society (AOGS) 18th Annual Meeting (virtually). The talk is titled Exploring diurnal cycles of surface urban heat island intensity in Boston with land surface temperature data derived from GOES-R geostationary satellites.

Jingfeng gave a talk at the USCCC 17th Annual Meeting (virtually). The title of the talk is Studying diurnal variations of ecosystem processes from space.

July:

Our perspective article is published in Nature Plants. With emerging satellite observations, we can now study diurnal cycling of plant functioning and ecosystem processes (e.g., GPP, ET, WUE) from space. We also envision that these emerging observations will revolutionize studies of plant functioning and ecosystem processes in the context of climate change and that these observations and findings can inform agricultural and forest management and lead to improvements in Earth system models and climate projections. w/ @jawzsh Hiro Hashimoto @kazuhito_ichii @ncparazoo. [PDF] [view-only version]

June:

Yue's paper titled Exploring diurnal thermal variations in urban local climate zones with ECOSTRESS land surface temperature data is published in Remote Sensing of Environment. This is one of the few earliest urban studies based on ECOSTRESS observations. [PDF]

April:

Jingfeng and Dr. Ge Sun (Forest Service) are funded for studying ecosystem functions of southern forests.

Xiaojuan's paper titled Improving the global MODIS GPP model by optimizing parameters with FLUXNET data is one of the most downloaded Agricultural and Forest Meteorology articles in the last 90 days (as of April 21, 2021). [PDF]

March:

Our global, 0.05-deg SIF and GPP products (GOSIF & GOSIF GPP) are now extended to 2020. The entire datasets (8-day/monthly, 0.05-deg, 2000-2020) are available at our data repository. GOSIF is based on OCO-2 SIF, and GOSIF GPP is derived from GOSIF and SIF-GPP relationships.

Jingfeng gave an invited talk at the FLUXNET Seminar Series on March 5, 2021. The talk is titled Assessing drought impacts on terrestrial photosynthesis with satellite data from OCO-2 and SMAP.

Xing's paper titled ECOSTRESS estimates gross primary production with fine spatial resolution for different times of day from the International Space Station is now published in Remote Sensing of Environment. We can now study the diurnal cycling of plant carbon uptake from space. [PDF]

February:

Haibo's paper titled Improving the capability of the SCOPE model for simulating solar-induced fluorescence and gross primary production using data from OCO-2 and flux towers is now published in Remote Sensing. [PDF]

January:

Xiaojuan's paper titled Improving the global MODIS GPP model by optimizing parameters with FLUXNET data is now published in Agricultural and Forest Meteorology. We optimized parameters and quantified parameter uncertainty for the MODIS GPP model for all vegetation types with data from 110 FLUXNET sites and the MCMC method. It is an effort towards improving the globall MODIS GPP product. [PDF]

Jingfeng has agreed to serve as an associate editor for Ecological Processes, an international, peer-reviewed, open access journal devoted to ecological studies with a focus on the underlying processes of the dynamics and functions of ecological systems at multiple spatial and temporal scales.

 

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:

Carbon flux, water use and surface energy balance of forest plantations, Agricultural and Forest Meteorology, Guest Editors: Xiaojuan Tong, Jingfeng Xiao, M. Altaf Arain (deadline: December 15, 2021)

 

Afforestation and Reforestation: Drivers, Dynamics, and Impacts, Forests, Guest editors: J. Xiao, G. Sun, L. Hao, G. Dong, Z. Zhang

 

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