Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Default user image.

Anders Lindroth

Professor emeritus

Default user image.

Increase in gross primary production of boreal forests balanced out by increase in ecosystem respiration

Författare

  • Jouni Pulliainen
  • Mika Aurela
  • Tuula Aalto
  • Kristin Böttcher
  • Juval Cohen
  • Chris Derksen
  • Martin Heimann
  • Manuel Helbig
  • Pasi Kolari
  • Anna Kontu
  • Alisa Krasnova
  • Samuli Launiainen
  • Juha Lemmetyinen
  • Hannakaisa Lindqvist
  • Anders Lindroth
  • Annalea Lohila
  • Kari Luojus
  • Ivan Mammarella
  • Tiina Markkanen
  • Elma Nevala
  • Steffen Noe
  • Matthias Peichl
  • Jukka Pumpanen
  • Kimmo Rautiainen
  • Miia Salminen
  • Oliver Sonnentag
  • Matias Takala
  • Tea Thum
  • Timo Vesala
  • Patrik Vestin
Visa allt

Summary, in English

Changes in the net carbon sink of boreal forests constitute a major source of uncertainty in the future global carbon budget and, hence, climate change projections. The annual net ecosystem exchange of carbon dioxide (CO2) controlling the terrestrial carbon stock results from the small difference between respiratory CO2 release and the photosynthetic CO2 uptake by vegetation. The boreal forest, and the boreal biome in general, is regarded as a persistent and even increasing net carbon sink. However, decreases in photosynthetic CO2 uptake and/or concurrent increases in respiratory CO2 release under a changing climate may turn boreal forests from a net sink to a net source of CO2. Here, we assessed the interannual variability of the boreal forest net CO2 sink-source strength and its two component fluxes from 1981 to 2018. Our remote sensing approach - trained by net CO2 flux observations at eddy covariance sites across the circumpolar boreal forests - employs satellite-derived retrievals of snowmelt timing, landscape freeze-thaw status, and yearly maximum estimates of the normalized difference vegetation index as a proxy for peak vegetation productivity. Our results suggest that for the period 2000–2018, the mean annual evergreen boreal forest CO2 photosynthetic uptake (gross primary productivity) was 0.2 Pg C y−1 (0.1 Pg C y−1 for Eurasia and 0.1 Pg C y−1 for North America). In contrast to earlier studies results obtained here do not indicate a clear increasing trend in the circumpolar evergreen boreal forest CO2 sink. The increase in photosynthetic CO2 uptake is compensated by increasing respiratory releases with both component fluxes showing considerable interannual variabilities.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2024-11-01

Språk

Engelska

Sidor

114376-114376

Publikation/Tidskrift/Serie

Remote Sensing of Environment

Volym

313

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Climate Research
  • Physical Geography

Nyckelord

  • Remote sensing of boreal forests
  • Remote sensing of cryosphere
  • Carbon balance
  • Eddy covariance
  • Passive microwave remote sensing
  • Carbon sink

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0034-4257