Please use this identifier to cite or link to this item:
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. 
Lu, X.X. 
He, M.
Zhou, Y.
Li, L.
Ziegler, A.D. 
Keywords: CO 2 degassing
Inorganic carbon
Organic carbon
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
ISSN: 00221694
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Feb 28, 2018


checked on Oct 4, 2021

Page view(s)

checked on Nov 18, 2021

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.