Long-term spatial and temporal variation of CO2 partial pressure in the Yellow River, China

doi:10.5194/bg-12-921-2015

	Long-term spatial and temporal variation of CO2 partial pressure in the Yellow River, China
	Ran, L.1; Lu, X. X.1,2; Richey, J. E.3; Sun, H.4; Han, J.4; Yu, R.2; Liao, S.5; Yi, Q.6
刊名	BIOGEOSCIENCES
	2015
卷号	12 期号:4 页码:921-932
ISSN号	1726-4170
DOI	10.5194/bg-12-921-2015
文献子类	Article
英文摘要	Carbon transport in river systems is an important component of the global carbon cycle. Most rivers of the world act as atmospheric CO2 sources due to high riverine CO2 partial pressure (pCO(2)). By determining the pCO(2) from alkalinity and pH, we investigated its spatial and temporal variation in the Yellow River watershed using historical water chemistry records (1950s-1984) and recent sampling along the mainstem (2011-2012). Except the headwater region where the pCO(2) was lower than the atmospheric equilibrium (i.e. 380 mu atm), river waters in the remaining watershed were supersaturated with CO2. The average pCO(2) for the watershed was estimated at 2810 +/- 1985 mu atm, which is 7-fold the atmospheric equilibrium. As a result of severe soil erosion and dry climate, waters from the Loess Plateau in the middle reaches had higher pCO(2) than that from the upper and lower reaches. From a seasonal perspective, the pCO(2) varied from about 200 mu atm to >30 000 mu atm with higher pCO(2) usually occurring in the dry season and lower pCO(2) in the wet season (at 73% of the sampling sites), suggesting the dilution effect of water. While the pCO(2) responded exponentially to total suspended solids (TSS) export when the TSS concentration was less than 100 kg m(-3), it decreased slightly and remained stable if the TSS concentration exceeded 100 kg m(-3). This stable pCO(2) is largely due to gully erosion that mobilizes subsoils characterized by low organic carbon for decomposition. In addition, human activities have changed the pCO(2) dynamics. Particularly, flow regulation by dams can diversely affect the temporal changes of pCO(2), depending on the physiochemical properties of the regulated waters and adopted operation scheme. Given the high pCO(2) in the Yellow River waters, large potential for CO2 evasion is expected and warrants further investigation.
WOS关键词	MAJOR-ELEMENT CHEMISTRY ; QINGHAI-TIBET PLATEAU ; CARBON-DIOXIDE ; ORGANIC-CARBON ; LOESS PLATEAU ; WEATHERING RATES ; AQUATIC CONDUIT ; INLAND WATERS ; YANGTZE-RIVER ; LOWER REACHES
WOS研究方向	Environmental Sciences & Ecology ; Geology
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000349794900002
资助机构	Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101) ; Ministry of Education, Singapore(MOE2011-T2-1-101)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86946]
专题	中国科学院地质与地球物理研究所
通讯作者	Lu, X. X.
作者单位	1.Natl Univ Singapore, Dept Geog, Singapore 117570, Singapore 2.Inner Mongolia Univ, Coll Environm & Resources, Hohhot 010021, Peoples R China 3.Univ Washington, Sch Oceanog, Seattle, WA 98195 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Yellow River Conservancy Commiss, Tongguan Hydrog Stn, Tongguan 714399, Peoples R China 6.Yellow River Conservancy Commiss, Toudaoguai Hydrog Stn, Baotou 014014, Peoples R China
推荐引用方式 GB/T 7714	Ran, L.,Lu, X. X.,Richey, J. E.,et al. Long-term spatial and temporal variation of CO2 partial pressure in the Yellow River, China[J]. BIOGEOSCIENCES,2015,12(4):921-932.
APA	Ran, L..,Lu, X. X..,Richey, J. E..,Sun, H..,Han, J..,...&Yi, Q..(2015).Long-term spatial and temporal variation of CO2 partial pressure in the Yellow River, China.BIOGEOSCIENCES,12(4),921-932.
MLA	Ran, L.,et al."Long-term spatial and temporal variation of CO2 partial pressure in the Yellow River, China".BIOGEOSCIENCES 12.4(2015):921-932.