Spatial and temporal variations of evapotranspiration, groundwater and precipitation in Amazonia
Juan Zhang1, Jie Niu1, Chaopeng Shen2, John M. Melack3, Jin Zhang1, Han Qiu4, Bill X. Hu1, and William J. Riley5
1Institute of Groundwater and Earth Science, Jinan University, Guangzhou 510632, China
2Civil and Environmental Engineering, Pennsylvania State University, PA
3Earth Research Institute, University of California, Santa Barbara, CA
4Joint Global Change Research Institute, Pacific Northwest National Lab, College Park, MD 20740, USA
5Earth Sciences Division, Lawrence Berkeley National Lab, Berkeley, CA
Correspondence to: J. Niu, jniu@jnu.edu.cn
Abstract
The relationships and seasonal-to-annual variations among evapotranspiration (ET ), precipitation (P ), and groundwater dynamics (total water storage anomaly, TWSA ) are complex across the Amazon basin, especially the water and energy limitation mechanism for ET . To analyze how ET is controlled by P and TWSA , we used wavelet coherence analysis to investigate the effects of P and TWSA onET at sub-basin, kilometer, regional, and whole basin scales in the Amazon basin. The Amazon-scale averaged ET has strong correlations with P and TWSA at the annual periodicity. The phase lag between ET and P (\(\phi_{ET-P}\)) is ~1 to ~4 months, and between ETand TWSA (\(\phi_{ET-TWSA}\)) is ~3 to ~7 months. The phase pattern has a south-north divide due to the significant variation in climatic conditions. The correlation between \(\phi_{ET-P}\) and \(\phi_{ET-TWSA}\) is affected by the aridity index, of each sub-basin, as determined using the Budyko framework at the sub-basin level. In the southeast Amazon during a drought year (e.g., 2010), both phases decreased, while in the subsequent years, \(\phi_{ET-TWSA}\) increased. The area of places where ET is limited by water continues to decrease over time in the southern Amazon basin. These results suggest immediate strong groundwater subsidy to ET in the following dry years in the water-limited area of Amazon. The water storage has more control onET in the southeast but little influence in the north and southwest after a drought. The areas of ET limited by energy or water are switched due to the variability in weather conditions.
Running head: Evapotranspiration, groundwater and precipitation variation in Amazon
Keywords: Evapotranspiration (ET ), Wavelet coherence, Amazon basin, Phase lag, Budyko framework