SwePub
Sök i LIBRIS databas

  Extended search

onr:"swepub:oai:lup.lub.lu.se:36bcdc9e-d56e-4a91-a157-56c112dcf4f9"
 

Search: onr:"swepub:oai:lup.lub.lu.se:36bcdc9e-d56e-4a91-a157-56c112dcf4f9" > Trends and drivers ...

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist
  • Sitch, S. (author)

Trends and drivers of regional sources and sinks of carbon dioxide over the past two decades

  • Article/chapterEnglish2013

Publisher, publication year, extent ...

  • Copernicus GmbH,2013

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:36bcdc9e-d56e-4a91-a157-56c112dcf4f9
  • https://lup.lub.lu.se/record/5274882URI
  • https://doi.org/10.5194/bgd-10-20113-2013DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:vet swepub-contenttype

Notes

  • Abstract. The land and ocean absorb on average over half of the anthropogenic emissions of carbon dioxide (CO2) every year. These CO2 "sinks" are modulated by climate change and variability. Here we use a suite of nine Dynamic Global Vegetation Models (DGVMs) and four Ocean Biogeochemical General Circulation Models (OBGCMs) to quantify the global and regional climate and atmospheric CO2 – driven trends in land and oceanic CO2 exchanges with the atmosphere over the period 1990–2009, attribute these trends to underlying processes, and quantify the uncertainty and level of model agreement. The models were forced with reconstructed climate fields and observed global atmospheric CO2; Land Use and Land Cover Changes are not included for the DGVMs. Over the period 1990–2009, the DGVMs simulate a mean global land carbon sink of −2.4 ± 0.7 Pg C yr−1 with a small significant trend of −0.06 ± 0.03 Pg C yr−2 (increasing sink). Over the more limited period 1990–2004, the ocean models simulate a mean ocean sink of –2.2 ± 0.2 Pg C yr–1 with a trend in the net C uptake that is indistinguishable from zero (−0.01 ± 0.02 Pg C yr−2). The two ocean models that extended the simulations until 2009 suggest a slightly stronger, but still small trend of −0.02 ± 0.01 Pg C yr−2. Trends from land and ocean models compare favourably to the land greenness trends from remote sensing, atmospheric inversion results, and the residual land sink required to close the global carbon budget. Trends in the land sink are driven by increasing net primary production (NPP) whose statistically significant trend of 0.22 ± 0.08 Pg C yr−2 exceeds a significant trend in heterotrophic respiration of 0.16 ± 0.05 Pg C yr−2 – primarily as a consequence of wide-spread CO2 fertilisation of plant production. Most of the land-based trend in simulated net carbon uptake originates from natural ecosystems in the tropics (−0.04 ± 0.01 Pg C yr−2), with almost no trend over the northern land region, where recent warming and reduced rainfall offsets the positive impact of elevated atmospheric CO2 on carbon storage. The small uptake trend in the ocean models emerges because climate variability and change, and in particular increasing sea surface temperatures, tend to counteract the trend in ocean uptake driven by the increase in atmospheric CO2. Large uncertainty remains in the magnitude and sign of modelled carbon trends in several regions, and on the influence of land use and land cover changes on regional trends.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Friedlingstein, P. (author)
  • Gruber, N. (author)
  • Jones, S. D. (author)
  • Murray-Tortarolo, G. (author)
  • Ahlström, AndersLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)nate-ana (author)
  • Doney, S. C. (author)
  • Graven, H. (author)
  • Heinze, C. (author)
  • Huntingford, C. (author)
  • Levis, S. (author)
  • Levy, P. E. (author)
  • Lomas, M. (author)
  • Poulter, B. (author)
  • Viovy, N. (author)
  • Zaehle, S. (author)
  • Zeng, N. (author)
  • Arneth, A. (author)
  • Bonan, G. (author)
  • Bopp, L. (author)
  • Canadell, J. G. (author)
  • Chevallier, F. (author)
  • Ciais, P. (author)
  • Ellis, R. (author)
  • Gloor, M. (author)
  • Peylin, P. (author)
  • Piao, S. (author)
  • Le Quéré, C. (author)
  • Smith, B. (author)
  • Zhu, Z. (author)
  • Myneni, R. (author)
  • Institutionen för naturgeografi och ekosystemvetenskapNaturvetenskapliga fakulteten (creator_code:org_t)

Related titles

  • In:Biogeosciences Discussions: Copernicus GmbH10, s. 20113-201771810-6277

Internet link

Find in a library

To the university's database

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Close

Copy and save the link in order to return to this view