Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1029/2022JG007344
Licence creative commons licence
Title (Primary) Spatial patterns of vegetation activity related to ENSO in northern South America
Author Estupinan-Suarez, L.M.; Mahecha, M.D.; Brenning, A.; Kraemer, G.; Poveda, G.; Reichstein, M.; Sierra, C.A.
Source Titel Journal of Geophysical Research-Biogeosciences
Year 2024
Department iDiv; RS
Volume 129
Issue 1
Page From e2022JG007344
Language englisch
Topic T5 Future Landscapes
Data and Software links
Keywords ENSO; tropical ecosystems; vegetation activity; dimensionality reduction analysis; lagged effects; biodiversity hotspots; northern south America
Abstract Interannual variability of vegetation activity (i.e., photosynthesis) is strongly correlated with El Niño Southern Oscillation (ENSO). Globally, a reduction in carbon uptake by terrestrial ecosystems has been observed during the ENSO warm phase (El Niño) and the opposite during the cold phase (La Niña). However, this global perspective obscures the heterogeneous impacts of ENSO at regional scales. Particularly, ENSO has contrasting impacts on climate in northern South America (NSA) depending on the ENSO phase and geographical location, which in turn affect the activity of vegetation. Furthermore, changes of vegetation activity during multiple ENSO events are not well understood yet. In this study, we investigated the spatial and temporal differences in vegetation activity associated with ENSO variability and its three phases (El Niño, La Niña, Neutral) to identify hotspots of ENSO impacts in NSA, a region dominated by rainforest and savannas. To achieve this, we investigated time series of vegetation variables from 2001 to 2014 at moderate spatial resolution (0.0083°). Data were aggregated through dimensionality reduction analysis (i.e., Global Principal Component Analysis). The leading principal component served as a proxy of vegetation activity (VAC). We calculated the cross-correlation between VAC and the multivariate ENSO index separately for each ENSO phase. Our results show that El Niño phase has a stronger impact on vegetation activity both in intensity and duration than La Niña phase. Moreover, seasonally dry ecoregions were more susceptible to El Niño impacts on vegetation activity. Understanding these differences is key for regional adaptation and differentiated management of ecosystems.
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Estupinan-Suarez, L.M., Mahecha, M.D., Brenning, A., Kraemer, G., Poveda, G., Reichstein, M., Sierra, C.A. (2024):
Spatial patterns of vegetation activity related to ENSO in northern South America
J. Geophys. Res.-Biogeosci. 129 (1), e2022JG007344 10.1029/2022JG007344