Large carbon cycle sensitivities to climate across a permafrost thaw gradient in subarctic Sweden

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Search: onr:"swepub:oai:DiVA.org:su-167511" > Large carbon cycle ...

1 of 1
Previous record
Next record
To hitlist

Details
MARC

Chang, Kuang-Yu (author)

Large carbon cycle sensitivities to climate across a permafrost thaw gradient in subarctic Sweden

Article/chapterEnglish2019

Publisher, publication year, extent ...

2019-02-22
Copernicus GmbH,2019
printrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:su-167511
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-167511URI
https://doi.org/10.5194/tc-13-647-2019DOI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

Classification

Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

Permafrost peatlands store large amounts of carbon potentially vulnerable to decomposition. However, the fate of that carbon in a changing climate remains uncertain in models due to complex interactions among hydrological, biogeochemical, microbial, and plant processes. In this study, we estimated effects of climate forcing biases present in global climate reanalysis products on carbon cycle predictions at a thawing permafrost peatland in subarctic Sweden. The analysis was conducted with a comprehensive biogeochemical model (ecosys) across a permafrost thaw gradient encompassing intact permafrost palsa with an ice core and a shallow active layer, partly thawed bog with a deeper active layer and a variable water table, and fen with a water table close to the surface, each with distinct vegetation and microbiota. Using in situ observations to correct local cold and wet biases found in the Global Soil Wetness Project Phase 3 (GSWP3) climate reanalysis forcing, we demonstrate good model performance by comparing predicted and observed carbon dioxide (CO2) and methane (CH4) exchanges, thaw depth, and water table depth. The simulations driven by the bias-corrected climate suggest that the three peatland types currently accumulate carbon from the atmosphere, although the bog and fen sites can have annual positive radiative forcing impacts due to their higher CH4 emissions. Our simulations indicate that projected precipitation increases could accelerate CH4 emissions from the palsa area, even without further degradation of palsa permafrost. The GSWP3 cold and wet biases for this site significantly alter simulation results and lead to erroneous active layer depth (ALD) and carbon budget estimates. Biases in simulated CO2 and CH4 exchanges from biased climate forcing are as large as those among the thaw stages themselves at a landscape scale across the examined permafrost thaw gradient. Future studies should thus not only focus on changes in carbon budget associated with morphological changes in thawing permafrost, but also recognize the effects of climate forcing uncertainty on carbon cycling.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng

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

Riley, William J. (author)
Crill, Patrick M.Stockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)pcril (author)
Grant, Robert F. (author)
Rich, Virginia I. (author)
Saleska, Scott R. (author)
Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

Related titles

In:The Cryosphere: Copernicus GmbH13:2, s. 647-6631994-04161994-0424

Internet link

Find in a library

The Cryosphere (Search for host publication in LIBRIS)

To the university's database

1 of 1
Previous record
Next record
To hitlist

Find more in SwePub

By the author/editor: Chang, Kuang-Yu; Riley, William J ...; Crill, Patrick M ...; Grant, Robert F.; Rich, Virginia I ...; Saleska, Scott R ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

Articles in the publication: The Cryosphere

By the university: Stockholm University

Search outside SwePub

Extend your search to:: Google; Google Book Search; Google Scholar

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.

LIBRIS.kb.se