Please use this identifier to cite or link to this item:
https://doi.org/10.1016/j.jhydrol.2012.08.011
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dc.title | Daily CO 2 partial pressure and CO 2 outgassing in the upper Yangtze River basin: A case study of the Longchuan River, China | |
dc.contributor.author | Li, S. | |
dc.contributor.author | Lu, X.X. | |
dc.contributor.author | He, M. | |
dc.contributor.author | Zhou, Y. | |
dc.contributor.author | Li, L. | |
dc.contributor.author | Ziegler, A.D. | |
dc.date.accessioned | 2014-04-02T08:17:43Z | |
dc.date.available | 2014-04-02T08:17:43Z | |
dc.date.issued | 2012-10-12 | |
dc.identifier.citation | Li, S., Lu, X.X., He, M., Zhou, Y., Li, L., Ziegler, A.D. (2012-10-12). Daily CO 2 partial pressure and CO 2 outgassing in the upper Yangtze River basin: A case study of the Longchuan River, China. Journal of Hydrology 466-467 : 141-150. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jhydrol.2012.08.011 | |
dc.identifier.issn | 00221694 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/49686 | |
dc.description.abstract | Rivers have been under sampled to investigate carbon degassing, especially in the tropical and sub-tropical regions. An unprecedented high-temporal-resolution (daily) sampling during July 2008-August 2009 was conducted in the Longchuan River of the upper Yangtze basin, a subtropical monsoon river in China, to reveal the daily-to-seasonal dynamics of the partial pressure of CO 2 (pCO 2) and CO 2 degassing flux from the river using Henry's constant and CO 2SYS. The pCO 2 levels ranged from 230 to 8300μatm with an average of 1230μatm and obvious daily and seasonal variations. More than 92% samples were supersaturated with CO 2 in contrast to the atmospheric equilibrium (380μatm). pCO 2 values in the river water in the wet season were relatively low, except in the flooding event in November, due to a dilution effect by heavy rainfall. In contrast, the pCO 2 levels in the dry season were much higher, due to lower pH resulted from anthropogenic activities. Net CO 2 degassing and pCO 2 were strongly correlated with dissolved nitrogen, but weakly with water temperature, dissolved inorganic carbon and water discharge, and uncorrelated with particulate nutrients and biogenic elements. The estimated water-to-air CO 2 degassing flux in the Longchuan River was about 27mol/m 2/yr, with the upper limit of 50mol/m 2/yr. Our study also indicated that among the carbon remobilized from land to water, around 7% (2800tC/yr) of the total carbon was emitted to the atmosphere, 42% (17,000tC/yr) deposited in the river-reservoirs system and 51% (21,000tC/yr) exported further downstream. High spatial and temporal resolution of estimates of CO 2 emission from the world large rivers is required due to extremely heterogeneous catchment characteristics and anthropogenic activities in space and time. © 2012 Elsevier B.V. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jhydrol.2012.08.011 | |
dc.source | Scopus | |
dc.subject | CO 2 degassing | |
dc.subject | Inorganic carbon | |
dc.subject | Organic carbon | |
dc.subject | Partial pressure of CO 2 (pCO 2) | |
dc.subject | Riverine carbon flux | |
dc.subject | The upper Yangtze | |
dc.type | Article | |
dc.contributor.department | GEOGRAPHY | |
dc.description.doi | 10.1016/j.jhydrol.2012.08.011 | |
dc.description.sourcetitle | Journal of Hydrology | |
dc.description.volume | 466-467 | |
dc.description.page | 141-150 | |
dc.description.coden | JHYDA | |
dc.identifier.isiut | 000309988700012 | |
Appears in Collections: | Staff Publications |
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