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Jonas Ardö

Professor

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Eddy covariance measurements reveal a decreased carbon sequestration strength 2010–2022 in an African semiarid savanna

Författare

  • Aleksander Wieckowski
  • Patrik Vestin
  • Jonas Ardö
  • Olivier Roupsard
  • Ousmane Ndiaye
  • Ousmane Diatta
  • Seydina Ba
  • Yélognissè Agbohessou
  • Rasmus Fensholt
  • Wim Verbruggen
  • Haftay Hailu Gebremedhn
  • Torbern Tagesson
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Summary, in English

Monitoring the changes of ecosystem functioning is pivotal for understanding the global carbon cycle. Despite its size and contribution to the global carbon cycle, Africa is largely understudied in regard to ongoing changes of its ecosystem functioning and their responses to climate change. One of the reasons is the lack of long-term in situ data. Here, we use eddy covariance to quantify the net ecosystem exchange (NEE) and its components—gross primary production (GPP) and ecosystem respiration (Reco) for years 2010–2022 for a Sahelian semiarid savanna to study trends in the fluxes. Significant negative trends were found for NEE (12.7 ± 2.8 g C m2 year−1), GPP (39.6 ± 7.9 g C m2 year−1), and Reco (32.2 ± 8.9 g C m2 year−1). We found that NEE decreased by 60% over the study period, and this decrease was mainly caused by stronger negative trends in rainy season GPP than in Reco. Additionally, we observed strong increasing trends in vapor pressure deficit, but no trends in rainfall or soil water content. Thus, a proposed explanation for the decrease in carbon sink strength is increasing atmospheric dryness. The warming climate in the Sahel, coupled with increasing evaporative demand, may thus lead to decreased GPP levels across this biome, and lowering its CO2 sequestration.

Avdelning/ar

  • MERGE: ModElling the Regional and Global Earth system
  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Institutionen för naturgeografi och ekosystemvetenskap

Publiceringsår

2024-09-01

Språk

Engelska

Publikation/Tidskrift/Serie

Global Change Biology

Volym

30

Avvikelse

9

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Climate Science
  • Physical Geography

Nyckelord

  • carbon loss
  • climate change
  • eddy covariance
  • rainfall
  • Sahel
  • semiarid savanna
  • vapor pressure deficit
  • water availability

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 1354-1013