
Anders Ahlström
Universitetslektor

The dominant role of semi-arid ecosystems in the trend and variability of the land CO2 sink
Författare
Summary, in English
The growth rate of atmospheric carbon dioxide (CO2) concentrations since industrialization is characterized by large interannual variability, mostly resulting from variability in CO2 uptake by terrestrial ecosystems (typically termed carbon sink). However, the contributions of regional ecosystems to that variability are not well known. Using an ensemble of ecosystem and land-surface models and an empirical observation-based product of global gross primary production, we show that the mean sink, trend, and interannual variability in CO2 uptake by terrestrial ecosystems are dominated by distinct biogeographic regions. Whereas the mean sink is dominated by highly productive lands (mainly tropical forests), the trend and interannual variability of the sink are dominated by semi-arid ecosystems whose carbon balance is strongly associated with circulation-driven variations in both precipitation and temperature.
Avdelning/ar
- Institutionen för naturgeografi och ekosystemvetenskap
- MERGE: ModElling the Regional and Global Earth system
- BECC: Biodiversity and Ecosystem services in a Changing Climate
Publiceringsår
2015
Språk
Engelska
Sidor
895-899
Publikation/Tidskrift/Serie
Science
Volym
348
Issue
6237
Fulltext
Dokumenttyp
Artikel i tidskrift
Förlag
American Association for the Advancement of Science (AAAS)
Ämne
- Physical Geography
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 1095-9203