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Storm pulses of dissolved CO 2 in a forested headwater Amazonian stream explored using hydrograph separation
Author(s) -
Johnson Mark S.,
Weiler Markus,
Couto Eduardo Guimarães,
Riha Susan J.,
Lehmann Johannes
Publication year - 2007
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2007wr006359
Subject(s) - hydrograph , storm , tracer , hydrology (agriculture) , amazonian , environmental science , drainage basin , geology , amazon rainforest , oceanography , geography , ecology , physics , cartography , geotechnical engineering , nuclear physics , biology
Dissolved CO 2 dynamics in stormflow and event water versus preevent water contributions to storm hydrographs were assessed in a forested headwater catchment of the Brazilian Amazon using high‐frequency data. We applied the transfer function hydrograph separation model (TRANSEP) using specific conductance as a conservative tracer, finding preevent water to average 0.79 ± 0.03 of storm discharge (mean ± 1 SE for n = 14 storms). In situ, direct measurements of dissolved CO 2 were able to capture new hydrobiogeochemical processes in real time, including CO 2 pulses observed on the falling limb of storm hydrographs, the magnitudes of which were inversely related to preevent water fractions ( r = −0.97, p < 0.0001).