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|Title:||Daily CO 2 partial pressure and CO 2 outgassing in the upper Yangtze River basin: A case study of the Longchuan River, China||Authors:||Li, S.
|Keywords:||CO 2 degassing
Partial pressure of CO 2 (pCO 2)
Riverine carbon flux
The upper Yangtze
|Issue Date:||12-Oct-2012||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.||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.||Source Title:||Journal of Hydrology||URI:||http://scholarbank.nus.edu.sg/handle/10635/49686||ISSN:||00221694|
|Appears in Collections:||Staff Publications|
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