Tracking vegetation phenology across diverse North American biomes using PhenoCam imagery

Scientific data - Tập 5 Số 1
Andrew D. Richardson1, Koen Hufkens1, Tom Milliman2, Donald M. Aubrecht1, Min Chen1, Josh Gray3, Miriam R. Johnston1, Trevor F. Keenan1, Stephen Klosterman1, Margaret Kosmala1, E. K. Melaas3, M. A. Friedl3, Steve Frolking2
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, 02138, MA, USA
2University of New Hampshire, Earth Systems Research Center, Durham, 03824, NH, USA
3Department of Earth and Environment, Boston University, Boston 02215, MA, USA

Tóm tắt

AbstractVegetation phenology controls the seasonality of many ecosystem processes, as well as numerous biosphere-atmosphere feedbacks. Phenology is also highly sensitive to climate change and variability. Here we present a series of datasets, together consisting of almost 750 years of observations, characterizing vegetation phenology in diverse ecosystems across North America. Our data are derived from conventional, visible-wavelength, automated digital camera imagery collected through the PhenoCam network. For each archived image, we extracted RGB (red, green, blue) colour channel information, with means and other statistics calculated across a region-of-interest (ROI) delineating a specific vegetation type. From the high-frequency (typically, 30 min) imagery, we derived time series characterizing vegetation colour, including “canopy greenness”, processed to 1- and 3-day intervals. For ecosystems with one or more annual cycles of vegetation activity, we provide estimates, with uncertainties, for the start of the “greenness rising” and end of the “greenness falling” stages. The database can be used for phenological model validation and development, evaluation of satellite remote sensing data products, benchmarking earth system models, and studies of climate change impacts on terrestrial ecosystems.

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