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16 Feb 2010
Status : this preprint was under review for the journal BG but the revision was not accepted.
Satellites reveal an increase in gross primary production in a greenlandic high arctic fen 1992–2008
T. Tagesson , M. Mastepanov , M. P. Tamstorf , L. Eklundh , P. Schubert , A. Ekberg , C. Sigsgaard , T. R. Christensen , and L. Ström
Arctic wetlands play a key role in the terrestrial carbon cycle. Recent studies have shown a greening trend and indicated an increase in CO2 uptake in boreal and sub- to low-arctic areas. Our aim was to combine satellite-based normalized difference vegetation index (NDVI) with ground-based flux measurements of CO2 to investigate a possible greening trend and potential changes in gross primary production (GPP) between 1992 and 2008 in a high arctic fen area. The study took place in Rylekaerene in the Zackenberg Research Area (74°28' N 20°34' W), located in the National park of North Eastern Greenland. We estimated the light use efficiency (ε ) for the dominant vegetation types from field measured fractions of photosynthetic active radiation (FAPAR) and ground-based flux measurements of GPP. Measured FAPAR were correlated to satellite-based NDVI. The FAPAR-NDVI relationship in combination with ε was applied to satellite data to model GPP 1992–2008. The model was evaluated against field measured GPP. The model was a useful tool for up-scaling GPP and all basic requirements for the model were well met, e.g., FAPAR was well correlated to NDVI and modeled GPP was well correlated to field measurements. The studied high arctic fen area has experienced a strong increase in GPP between 1992 and 2008. The area has during this period also experienced a substantial increase in local air temperature. Consequently, the observed greening trend is most likely due to ongoing climatic change possibly in combination with CO2 fertilization, due to increasing atmospheric concentrations of CO2 .
Received: 14 Jan 2010 – Discussion started: 16 Feb 2010
T. Tagesson , M. Mastepanov , M. P. Tamstorf , L. Eklundh , P. Schubert , A. Ekberg , C. Sigsgaard , T. R. Christensen , and L. Ström
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
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Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
T. Tagesson , M. Mastepanov , M. P. Tamstorf , L. Eklundh , P. Schubert , A. Ekberg , C. Sigsgaard , T. R. Christensen , and L. Ström
T. Tagesson , M. Mastepanov , M. P. Tamstorf , L. Eklundh , P. Schubert , A. Ekberg , C. Sigsgaard , T. R. Christensen , and L. Ström
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