Rights statement: ©2014. American Geophysical Union. All Rights Reserved. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
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Final published version
Licence: CC BY-NC-ND
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Mobilization of optically invisible dissolved organic matter (iDOM) in response to rainstorm events in a tropical forest headwater river.
AU - Pereira, Ryan
AU - Bovolo, C. Isabella
AU - Spencer, Robert G. M.
AU - Hernes, Peter J.
AU - Tipping, Edward
AU - Vieth-Hillebrand, Andrea
AU - Pedentchouk, Nikolai
AU - Chappell, Nick A.
AU - Parkin, Geoff
AU - Wagner, Thomas
N1 - ©2014. American Geophysical Union. All Rights Reserved. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
PY - 2014/2/28
Y1 - 2014/2/28
N2 - This study emphasizes the importance of rainstorm events in mobilizing carbon at the soil-stream interface from tropical rainforests. Half-hourly geochemical/isotopic records over a 13.5 h period from a 20 km2 tropical rainforest headwater in Guyana show an order of magnitude increase in dissolved organic carbon (DOC) concentration in less than 30 mins (10.6–114 mg/L). The composition of DOC varies significantly and includes optically invisible dissolved organic matter (iDOM) that accounts for a large proportion (4–89%) of the total DOC, quantified using size exclusion chromatography (SEC). SEC suggests that iDOM is comprised of low molecular weight organic moieties, which are likely sourced from fresh leaf litter and/or topsoil, as shown in soils from the surrounding environment. Although poorly constrained at present, the presence of iDOM further downstream during the wet season suggests that this organic matter fraction may represent an unquantified source of riverine CO2 outgassing in tropical headwaters, requiring further consideration.
AB - This study emphasizes the importance of rainstorm events in mobilizing carbon at the soil-stream interface from tropical rainforests. Half-hourly geochemical/isotopic records over a 13.5 h period from a 20 km2 tropical rainforest headwater in Guyana show an order of magnitude increase in dissolved organic carbon (DOC) concentration in less than 30 mins (10.6–114 mg/L). The composition of DOC varies significantly and includes optically invisible dissolved organic matter (iDOM) that accounts for a large proportion (4–89%) of the total DOC, quantified using size exclusion chromatography (SEC). SEC suggests that iDOM is comprised of low molecular weight organic moieties, which are likely sourced from fresh leaf litter and/or topsoil, as shown in soils from the surrounding environment. Although poorly constrained at present, the presence of iDOM further downstream during the wet season suggests that this organic matter fraction may represent an unquantified source of riverine CO2 outgassing in tropical headwaters, requiring further consideration.
KW - DOC
KW - headwaters
KW - tropics
KW - iDOM
KW - invisible
U2 - 10.1002/2013GL058658
DO - 10.1002/2013GL058658
M3 - Journal article
VL - 41
SP - 1202
EP - 1208
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 4
ER -