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Impact of Deforestation on Land–Atmosphere Coupling Strength and Climate in Southeast Asia

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  • Merja H. Tölle

    (Department of Geography, Justus-Liebig University Giessen, 35390 Giessen, Germany
    Center of Environmental Systems Research (CESR), University of Kassel, 34117 Kassel, Germany)

Abstract

Southeast Asia (SEA) is a deforestation hotspot. A thorough understanding of the accompanying biogeophysical consequences is crucial for sustainable future development of the region’s ecosystem functions and society. In this study, data from ERA-Interim driven simulations conducted with the state-of-the-art regional climate model COSMO-CLM (CCLM; version 4.8.17) at 14 km horizontal resolution are analyzed over SEA for the period from 1990 to 2004, and during El Niño–Southern Oscillation (ENSO) events for November to March. A simulation with large-scale deforested land cover is compared to a simulation with no land cover change. In order to attribute the differences due to deforestation to feedback mechanisms, the coupling strength concept is applied based on Pearson correlation coefficients. The correlations were calculated based on 10-day means between the latent heat flux and maximum temperature, the latent and sensible heat flux, and the latent heat flux and planetary boundary layer height. The results show that the coupling strength between land and atmosphere increased for all correlations due to deforestation. This implies a strong impact of the land on the atmosphere after deforestation. Differences in environmental conditions due to deforestation are most effective during La Niña years. The strength of La Nina events on the region is reduced as the impact of deforestation on the atmosphere with drier and warmer conditions superimpose this effect. The correlation strength also intensified and shifted towards stronger coupling during El Niño events for both Control and Grass simulations. However, El Niño years have the potential to become even warmer and drier than during usual conditions without deforestation. This could favor an increase in the formation of tropical cyclones. Whether deforestation will lead to a permanent transition to agricultural production increases in this region cannot be concluded. Rather, the impact of deforestation will be an additional threat besides global warming in the next decades due to the increase in the occurrence of multiple extreme events. This may change the type and severity of upcoming impacts and the vulnerability and sustainability of our society.

Suggested Citation

  • Merja H. Tölle, 2020. "Impact of Deforestation on Land–Atmosphere Coupling Strength and Climate in Southeast Asia," Sustainability, MDPI, vol. 12(15), pages 1-14, July.
  • Handle: RePEc:gam:jsusta:v:12:y:2020:i:15:p:6140-:d:392235
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    References listed on IDEAS

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    1. Adriaan J. Teuling & Christopher M. Taylor & Jan Fokke Meirink & Lieke A. Melsen & Diego G. Miralles & Chiel C. van Heerwaarden & Robert Vautard & Annemiek I. Stegehuis & Gert-Jan Nabuurs & Jordi Vilà, 2017. "Observational evidence for cloud cover enhancement over western European forests," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
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