J.M. Turowski
Decadal carbon discharge by a mountain stream is dominated by coarse organic matter
Turowski, J.M.; Hilton, R.G.; Sparkes, R.
Authors
R.G. Hilton
R. Sparkes
Abstract
Rapid erosion in mountain forests results in high rates of biospheric particulate organic carbon (POC) export by rivers, which can contribute to atmospheric carbon dioxide drawdown. However, coarse POC (CPOC) carried by particles >∼1 mm is rarely quantified. In a forested pre-Alpine catchment, we measured CPOC transport rates and found that they increase more rapidly with water discharge than fine POC (<1 mm) and dissolved organic carbon (DOC). As a result, decadal estimates of CPOC yield of 12.3 ± 1.9 t C km–2 yr–1 are higher than for fine POC and DOC, even when excluding 4 extreme flood events. When including these floods, CPOC dominates organic carbon discharge (∼80%). Most CPOC (69%) was water logged and denser than water, suggesting that CPOC has the potential to contribute to long-term sedimentary burial. Global fluxes remain poorly constrained, but if the transport behavior of CPOC shown here is common to other mountain streams and rivers, then neglecting CPOC discharge could lead to a large underestimation of the global transfer of biospheric POC from land to ocean.
Citation
Turowski, J., Hilton, R., & Sparkes, R. (2016). Decadal carbon discharge by a mountain stream is dominated by coarse organic matter. Geology, 44(1), 27-30. https://doi.org/10.1130/g37192.1
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 29, 2015 |
Online Publication Date | Nov 20, 2015 |
Publication Date | Jan 1, 2016 |
Deposit Date | Nov 23, 2015 |
Publicly Available Date | Nov 20, 2016 |
Journal | Geology |
Print ISSN | 0091-7613 |
Electronic ISSN | 1943-2682 |
Publisher | Geological Society of America |
Peer Reviewed | Peer Reviewed |
Volume | 44 |
Issue | 1 |
Pages | 27-30 |
DOI | https://doi.org/10.1130/g37192.1 |
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