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Access type: UnknownAuthor: search.filters.author.Fabrice Papa

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    Patterns and drivers of evapotranspiration in South American wetlands
    (Universidad Científica del Sur, 2021-04-14)
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    Patterns and Drivers of Evapotranspiration in South American Wetlands
    (Nature Research, 2023-12-01)
    Evapotranspiration (ET) is a key process linking surface and atmospheric energy budgets, yet its drivers and patterns across wetlandscapes are poorly understood worldwide. Here we assess the ET dynamics in 12 wetland complexes across South America, revealing major differences under temperate, tropical, and equatorial climates. While net radiation is a dominant driver of ET seasonality in most environments, flooding also contributes strongly to ET in tropical and equatorial wetlands, especially in meeting the evaporative demand. Moreover, significant water losses through wetlands and ET differences between wetlands and uplands occur in temperate, more water-limited environments and in highly flooded areas such as the Pantanal, where slow river flood propagation drives the ET dynamics. Finally, floodplain forests produce the greatest ET in all environments except the Amazon River floodplains, where upland forests sustain high rates year round. Our findings highlight the unique hydrological functioning and ecosystem services provided by wetlands on a continental scale.
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    Recent significant drying in Central Congo Basin linked to weakened Walker circulation and warmer Atlantic
    (Nature Portfolio, 2025-12-01)
    The Congo River Basin (CRB), hosting the second-largest tropical forest on Earth, is of global significance for the water and carbon cycles. Its population and ecosystems are also strongly dependent on freshwater availability, which is increasingly threatened by current climate change and deforestation. Persistent drought conditions in CRB have been reported, but their drivers and impacts on the basin's hydrology remain unknown. Here, we analyze 42 years (1981–2022) of atmospheric and hydrological variability to show that the drying trend in Central Congo is linked to reduced atmospheric moisture convergence and precipitation, primarily during the rainiest period. This trend correlates with a weakening of the Walker circulation and an increase in Sea Surface Temperature in the Central Eastern Tropical Atlantic Ocean which influences moisture convergence over the Central Congo with a ~3-month lag. Our findings emphasize the need for integrative atmospheric and hydrological approaches to address CRB's freshwater and forest vulnerability to climate change.
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