{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T20:38:12Z","timestamp":1771533492353,"version":"3.50.1"},"reference-count":81,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2022,5,24]],"date-time":"2022-05-24T00:00:00Z","timestamp":1653350400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>We evaluated the coupled dynamics of vegetation dynamics (NDVI) and soil moisture (SMOS) at monthly resolution over different regions of tropical South America and the effects of the Eastern Pacific (EP) and the Central Pacific (CP) El Ni\u00f1o\u2013Southern Oscillation (ENSO) events. We used linear Pearson cross-correlation, wavelet and cross wavelet analysis (CWA) and three nonlinear causality methods: ParrCorr, GPDC and PCMCIplus. Results showed that NDVI peaks when SMOS is transitioning from maximum to minimum monthly values, which confirms the role of SMOS in the hydrological dynamics of the Amazonian greening up during the dry season. Linear correlations showed significant positive values when SMOS leads NDVI by 1\u20133 months. Wavelet analysis evidenced strong 12- and 64-month frequency bands throughout the entire record length, in particular for SMOS, whereas the CWA analyses indicated that both variables exhibit a strong coherency at a wide range of frequency bands from 2 to 32 months. Linear and nonlinear causality measures also showed that ENSO effects are greater on SMOS. Lagged cross-correlations displayed that western (eastern) regions are more associated with the CP (EP), and that the effects of ENSO manifest as a travelling wave over time, from northwest (earlier) to southeast (later) over tropical South America and the Amazon River basin. The ParrCorr and PCMCIplus methods produced the most coherent results, and allowed us to conclude that: (1) the nonlinear temporal persistence (memory) of soil moisture is stronger than that of NDVI; (2) the existence of two-way nonlinear causalities between NDVI and SMOS; (3) diverse causal links between both variables and the ENSO indices: CP (7\/12 with ParrCorr; 6\/12 with PCMCIplus), and less with EP (5\/12 with ParrCorr; 3\/12 with PCMCIplus).<\/jats:p>","DOI":"10.3390\/rs14112521","type":"journal-article","created":{"date-parts":[[2022,5,25]],"date-time":"2022-05-25T00:14:14Z","timestamp":1653437654000},"page":"2521","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Spatiotemporal Dynamics of NDVI, Soil Moisture and ENSO in Tropical South America"],"prefix":"10.3390","volume":"14","author":[{"given":"Diana M.","family":"\u00c1lvarez","sequence":"first","affiliation":[{"name":"Department of Geosciences and Environment, Universidad Nacional de Colombia, Medell\u00edn 050034, Colombia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7907-6360","authenticated-orcid":false,"given":"Germ\u00e1n","family":"Poveda","sequence":"additional","affiliation":[{"name":"Department of Geosciences and Environment, Universidad Nacional de Colombia, Medell\u00edn 050034, Colombia"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"13337","DOI":"10.5194\/acp-14-13337-2014","article-title":"On the importance of cascading moisture recycling in South America","volume":"14","author":"Zemp","year":"2014","journal-title":"Atmos. 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