
Research topics
- Computer Science
- Ecology
- Environmental science
- Geology
- Data Mining
- World Wide Web
- Database
- Information Retrieval
- Biology
- Geography
- Soil science
- Remote sensing
- Climatology
- Demography
- Statistics
- Programming language
- Physical geography
- Chemistry
- Atmospheric sciences
- Mathematics
Selected publications
Scientific Data · 2021 · 109 citations
- Computer Science
- Information Retrieval
- Computer Science
A Correction to this paper has been published: https://doi.org/10.1038/s41597-021-00851-9.
Warming as a Driver of Vegetation Loss in the Sonoran Desert of California
Journal of Geophysical Research Biogeosciences · 2021 · 40 citations
Senior authorCorresponding- Environmental science
- Climatology
- Physical geography
Abstract Dryland ecosystems cover large regions of the Earth and have important impacts on global biogeochemistry and the carbon cycle. The plant species that occupy dryland environments have traits that enable them to withstand harsh environmental conditions, and some researchers have hypothesized that dryland vegetation may be comparatively resilient to changing climate, while others have pointed out that dryland vegetation often operates close to the physiological limits of many species, implying a possible vulnerability to warming. Here we use the Landsat archive to analyze vegetation dynamics for part of the Sonoran Desert and adjacent mountains in southern California. We show that large decreases in vegetation cover occurred over the last 34 years (1984–2017), especially across the xeric portions of our study region, where we observed a normalized difference vegetation index (NDVI) decline of 1.1 ± 0.3% yr −1 . Changes in precipitation explain most of the year‐to‐year variation but are unable to fully explain the observed long‐term decline in NDVI. Statistical models that combined summer temperature and mean annual precipitation explained more of the spatial and temporal structure of NDVI trends and implicate climate warming as an important driver of declining vegetation cover. The impact of warming contributed to a change in the precipitation‐vegetation relationship through time for this desert region, indicating a structural change in ecosystem function during the study period. These results suggest that recent climate change has already had significant impact on these drylands and highlight the potential for future warming to increase risks for dryland ecosystems in other regions.
Warming increased bark beetle‐induced tree mortality by 30% during an extreme drought in California
Global Change Biology · 2021 · 77 citations
- Biology
- Ecology
- Demography
if the effects of compromised tree defenses (15%-20%) and increased western pine beetle populations (20%) are additive. Due to the warming ability to considerably increase mortality through the mechanism of bark beetle populations, models need to consider climate's influence on both host tree stress and the bark beetle population dynamics when determining future levels of tree mortality.
Global Change Biology · 2020 · 100 citations
- Computer Science
- Environmental science
- Atmospheric sciences
, the database design accommodates other soil-atmosphere measurements (e.g. ecosystem respiration, chamber-measured net ecosystem exchange, methane fluxes) as well as experimental treatments (heterotrophic only, etc.). We give brief examples of the types of analyses possible using this new community resource and describe its accompanying R software package.
The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data
Scientific Data · 2020 · 1726 citations
- Computer Science
- Data Mining
- Computer Science
, water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed under a Creative Commons (CC-BY 4.0) license. This paper details this enhanced dataset and the processing methods, now made available as open-source codes, making the dataset more accessible, transparent, and reproducible.
Frequent coauthors
- 200 shared
Yang Chen
Nanyang Technological University
- 161 shared
Steven C. Wofsy
- 152 shared
J. William Munger
Harvard University Press
- 90 shared
Bruce C. Daube
Harvard University
- 82 shared
James T. Randerson
University of California, Irvine
- 63 shared
S. D. Miller
Albany State University
- 54 shared
P. M. Crill
Stockholm University
- 52 shared
Humberto Ribeiro da Rocha
Universidade de São Paulo
Education
- 1991
PhD, Biological Sciences
Stanford University
- 1983
BA, Biology
Reed College
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