Quantifying the relative importance of lake emissions in the carbon budget of a subarctic catchment
Publikation: Bidrag til bog/antologi/rapport › Bidrag til bog/antologi › Forskning › fagfællebedømt
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Quantifying the relative importance of lake emissions in the carbon budget of a subarctic catchment. / Karlsson, Jan; Christensen, Torben R.; Friborg, Thomas; Förster, Johannes; Hammarlund, Dan; Jackowicz-Korczyński, Marcin; Kokfeit, Ulla; Roehm, Charlotte; Rosen, Peter.
Land-atmosphere interaction of a subarctic palsa mire. 184. udg. 2009. s. 85-93 (Meddelanden fran Lunds Universitets Geografiska Institutioner, Avhandlingar; Nr. 184).Publikation: Bidrag til bog/antologi/rapport › Bidrag til bog/antologi › Forskning › fagfællebedømt
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TY - CHAP
T1 - Quantifying the relative importance of lake emissions in the carbon budget of a subarctic catchment
AU - Karlsson, Jan
AU - Christensen, Torben R.
AU - Friborg, Thomas
AU - Förster, Johannes
AU - Hammarlund, Dan
AU - Jackowicz-Korczyński, Marcin
AU - Kokfeit, Ulla
AU - Roehm, Charlotte
AU - Rosen, Peter
PY - 2009
Y1 - 2009
N2 - We studied a subarctic lake in an area of sporadic permafrost in order to assess the quantitative importance of lake processes for the catchment carbon balance. Estimates of net ecosystem production and stable carbon-isotope composition of dissolved organic carbon (DOC) in the lake water suggest substantial input and respiration of terrestrial organic carbon in the lake. Total export of terrestrial carbon amounted to 9.5 g C m-2yr -1 of which about half was mineralized in the lake and released as CO2 and CH4 to the atmosphere. The lateral carbon export and die return flux of carbon to the atmosphere from the lake was equivalent to 20% and 10%, respectively, of the terrestrial net uptake of carbon. The terrestrial NEE is biased towards the wet part of the catchment where the sink strength is highest, implying that the importance of carbon losses via aquatic systems is even higher than the budget calculation demonstrate. The results show that lakes are important sources of catchment carbon emission, potentially increasing the positive feedback from permafrost melting on global warming.
AB - We studied a subarctic lake in an area of sporadic permafrost in order to assess the quantitative importance of lake processes for the catchment carbon balance. Estimates of net ecosystem production and stable carbon-isotope composition of dissolved organic carbon (DOC) in the lake water suggest substantial input and respiration of terrestrial organic carbon in the lake. Total export of terrestrial carbon amounted to 9.5 g C m-2yr -1 of which about half was mineralized in the lake and released as CO2 and CH4 to the atmosphere. The lateral carbon export and die return flux of carbon to the atmosphere from the lake was equivalent to 20% and 10%, respectively, of the terrestrial net uptake of carbon. The terrestrial NEE is biased towards the wet part of the catchment where the sink strength is highest, implying that the importance of carbon losses via aquatic systems is even higher than the budget calculation demonstrate. The results show that lakes are important sources of catchment carbon emission, potentially increasing the positive feedback from permafrost melting on global warming.
KW - Carbon emission
KW - Carbon export
KW - Lake respiration
KW - Net ecosystem exchange
KW - Permafrost
KW - Subarctic catchment
KW - Terrestrial organic carbon
UR - http://www.scopus.com/inward/record.url?scp=67649834116&partnerID=8YFLogxK
M3 - Book chapter
AN - SCOPUS:67649834116
SN - 9789185793099
T3 - Meddelanden fran Lunds Universitets Geografiska Institutioner, Avhandlingar
SP - 85
EP - 93
BT - Land-atmosphere interaction of a subarctic palsa mire
ER -
ID: 346188738