干旱区生态环境知识资源中心(Arid): Sustained high CO2 concentrations and fluxes from Australia's largest river system

Arid

DOI	10.1071/MF21154
	Sustained high CO2 concentrations and fluxes from Australia's largest river system
	Bargrizan, Sima; Biswas, Tapas K.; Joehnk, Klaus D.; Mosley, Luke M.
通讯作者	Mosley, LM (corresponding author)，Univ Adelaide, Sch Biol Sci, Adelaide, SA 5001, Australia.
来源期刊	MARINE AND FRESHWATER RESEARCH
ISSN	1323-1650
EISSN	1448-6059
出版年	2022-02
英文摘要	Many of the world's rivers have been found to be sources of CO2 to the atmosphere, however, there has been limited assessment in arid regions. This analysis of a long-term (1979-2013) dataset (n = 3496) along Australia's largest river system (River Murray) showed that there were sustained high pCO(2) (carbon dioxide partial pressure) levels, ranging from 1210 +/- 107 to 3066 +/- 579 mu atm along the main river channel, and 5114 +/- 1221 mu atm on the major tributaries. As a consequence, the River Murray is a significant source of CO2 to the atmosphere, with an estimated average annual (+/- s.d.) flux of 218 +/- 98 g C m(-2) year(-1) and total emissions of 355 000 +/- 29 000 t CO2 year(-1) over a total river area of 386 km(2) from below Lake Hume to Tailem Bend, although there is some uncertainty with gas transfer coefficients. Supersaturation with CO2 relative to the atmosphere was maintained even under drought conditions with minimal external carbon inputs, suggesting internal carbon cycling and respiration is important in driving net CO2 production. Supersaturation of the river water relative to calcium carbonate minerals was also observed under low flow conditions. Hydro-climatic changes could be having significant impacts on the CO2 system in the River Murray and other arid river systems.
英文关键词	alkalinity calcium carbonate carbon dioxide climate change gas exchange heterotrophic respiration Murray-Darling Basin River Murray
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000752341800001
WOS关键词	CARBON-DIOXIDE ; PARTIAL-PRESSURE ; ORGANIC-CARBON ; WATER-QUALITY ; GAS-EXCHANGE ; ALKALINITY ; CATCHMENTS ; EMISSIONS ; DYNAMICS ; PCO(2)
WOS类目	Fisheries ; Limnology ; Marine & Freshwater Biology ; Oceanography
WOS研究方向	Fisheries ; Marine & Freshwater Biology ; Oceanography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377325
作者单位	[Bargrizan, Sima; Mosley, Luke M.] Univ Adelaide, Sch Biol Sci, Adelaide, SA 5001, Australia; [Bargrizan, Sima; Biswas, Tapas K.; Joehnk, Klaus D.] CSIRO, Canberra, ACT 2601, Australia
推荐引用方式 GB/T 7714	Bargrizan, Sima,Biswas, Tapas K.,Joehnk, Klaus D.,et al. Sustained high CO2 concentrations and fluxes from Australia's largest river system[J],2022.
APA	Bargrizan, Sima,Biswas, Tapas K.,Joehnk, Klaus D.,&Mosley, Luke M..(2022).Sustained high CO2 concentrations and fluxes from Australia's largest river system.MARINE AND FRESHWATER RESEARCH.
MLA	Bargrizan, Sima,et al."Sustained high CO2 concentrations and fluxes from Australia's largest river system".MARINE AND FRESHWATER RESEARCH (2022).