Widespread increase of boreal summer dry season length over the Congo rainforest

Yan Jiang, Liming Zhou (), Compton J. Tucker, Ajay Raghavendra, Wenjian Hua, Yi Y. Liu and Joanna Joiner
Additional contact information
Yan Jiang: University at Albany, State University of New York
Liming Zhou: University at Albany, State University of New York
Compton J. Tucker: NASA Goddard Space Flight Center
Ajay Raghavendra: University at Albany, State University of New York
Wenjian Hua: University at Albany, State University of New York
Yi Y. Liu: Nanjing University of Information Science & Technology
Joanna Joiner: NASA Goddard Space Flight Center

Nature Climate Change, 2019, vol. 9, issue 8, 617-622

Abstract: Abstract Dry season length strongly influences tropical rainforest vegetation and is largely determined by precipitation patterns1,2. Over the Amazon, the dry season length has increased since 1979 and severe short-term droughts have occurred3,4. However, similar changes have not been investigated for the world’s second largest rainforest, the Congo Basin, where long-term drying and large-scale declines in forest greenness and canopy water content were reported5. Here we present observational evidence for widespread increases in the boreal summer (June–August) dry season length over the Congo Basin since the 1980s, from both hydrological and ecological perspectives. We analysed both dry season onset and dry season end via multiple independent precipitation and satellite-derived vegetation datasets for the period 1979–2015. The dry season length increased by 6.4–10.4 days per decade in the period 1988–2013, primarily attributed to an earlier dry season onset and a delayed dry season end. The earlier dry season onset was caused by long-term droughts due to decreased rainfall in the pre-dry season (April–June). The delayed dry season end resulted from insufficiently replenished soil moisture, which postpones the start of the next wet season and hinders vegetation regrowth. If such changes continue, the enhanced water stress in a warming climate may affect the carbon cycle and alter the composition and structure of evergreen rainforest1,6.

Date: 2019
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DOI: 10.1038/s41558-019-0512-y

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