Coupled vegetation-precipitation variability observed from satellite and climate records

Details Coupled vegetation-precipitation variability observed from satellite and climate records Coupled vegetation-precipitation variability observed from satellite and climate records

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nclm8l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 14, pp. CLM 8-1, CiteID 1774, DOI 10.1029/2003GL017506

Mathematics

Logic

12

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Hydrology: Precipitation (3354), Global Change: Climate Dynamics (3309), Global Change: Remote Sensing

Scientific paper

Variability in precipitation regimes at seasonal and longer time scales strongly influences ecosystem dynamics in arid and semi-arid regions. In this paper, we use time series of global precipitation and satellite normalized difference vegetation index (NDVI) data to analyze joint spatial and temporal variability between terrestrial ecosystems and precipitation regimes. Accumulated monthly rainfall anomalies are quantified using a standardized precipitation index (SPI), which provides a better measure of ecologically significant precipitation excess or deficit at growing season time scales relative to monthly precipitation data. Results from canonical correlation analysis reveal geographically extensive patterns of joint NDVI-SPI variability suggestive of strong climate-biosphere coupling. Further, leading modes of covariability are shown to be related to large-scale ocean-atmosphere circulation anomalies. These results illustrate the global extent and sensitivity of ecosystems susceptible to climate change-induced perturbations in precipitation regimes.

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