The pantropical response of soil moisture to El Niño.
The 2015–2016 El Niño event ranks as one of the most severe on record in terms of the magnitude and extent of sea surface temperature (SST) anomalies generated in the tropical Pacific Ocean. Corresponding global impacts on the climate were expected to rival, or even surpass, those of the 1997–1998 severe El Niño event, which had SST anomalies that were similar in size. However, the 2015–2016 event failed to meet expectations for hydrologic change in many areas, including those expected to receive well above normal precipitation. To better understand how climate anomalies during an El Niño event impact soil moisture, we investigate changes in soil moisture in the humid tropics (between ± 25◦) during the three most recent super El Niño events of 1982–1983, 1997–1998 and 2015–2016, using data from the Global Land Data Assimilation System (GLDAS). First, we use in situ soil moisture observations obtained from 16 sites across five continents to validate and bias-correct estimates from GLDAS (r2 = 0.54). Next, we apply a k-means cluster analysis to the soil moisture estimates during the El Niño mature phase, resulting in four groups of clustered data. The strongest and most consistent decreases in soil moisture occur in the Amazon basin and maritime southeastern Asia, while the most consistent increases occur over eastern Africa. In addition, we compare changes in soil moisture to both precipitation and evapotranspiration, which showed a lack of agreement in the direction of change between these variables and soil moisture most prominently in the southern Amazon basin, the Sahel and mainland southeastern Asia. Our results can be used to improve estimates of spatiotemporal differences in El Niño impacts on soil moisture in tropical hydrology and ecosystem models at multiple scales.
Main Authors: | SOLANDER, K. C., NEWMAN, B. D., ARAUJO, A. C. de, BARNARD, H. R., BERRY, Z. C., BONAL, D., BRETFELD, M., BURBAN, B., CANDIDO, L. A., CÉLLERI, R., CHAMBERS, J. Q., CHRISTOFFERSEN, B. O., DETTO, M., DORIGO, W. A., EWERS, B. E., FERREIRA, S. J. F., KNOHL, A., LEUNG, L. R., McDOWELL, N. G., MILLER, G. R., MONTEIRO, M. T. F., MOORE, G. W., NEGRON-JUAREZ, R., SALESKA, S. R., STIEGLER, C., TOMASELLA, J., XU, C. |
---|---|
Other Authors: | KURT C. SOLANDER, LOS ALAMOS NATIONAL LABORATOR |
Format: | Artigo de periódico biblioteca |
Language: | Ingles English |
Published: |
2023-12-12
|
Subjects: | Soil moisture, Clima, Mudança Climática, Umidade do Solo, El Nino, |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1159556 https://doi.org/10.5194/hess-24-2303-2020 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Can current moisture responses predict soil CO2 efflux under altered precipitation regimes? A synthesis of manipulation experiments.
by: VICCA, S., et al.
Published: (2015-02-24) -
Resposta biométrica de cultivares de sorgo biomassa em função da umidade do solo e da época de plantio.
by: SILVA, W. O. da, et al.
Published: (2024-07-05) -
Resposta fisiológica de genótipos de Macroptilium sp. em função do déficit hídrico e época de plantio.
by: COELHO, W. S. S., et al.
Published: (2024-07-03) -
O clima e as plantas.
by: SILVA, A. F.
Published: (2020) -
Sistema de consulta e visualização das projeções dos modelos climáticos globais do IPPC AR4 para o Brasil.
by: GERALDO, R., et al.
Published: (2015-01-22)