干旱区生态环境知识资源中心(Arid): Calcite precipitation in Lake Powell reduces alkalinity and total salt loading to the Lower Colorado River Basin

Arid

DOI	10.1002/lno.11399
	Calcite precipitation in Lake Powell reduces alkalinity and total salt loading to the Lower Colorado River Basin
	Deemer, Bridget R.1; Stets, Edward G.2; Yackulic, Charles B.1
通讯作者	Deemer, Bridget R.
来源期刊	LIMNOLOGY AND OCEANOGRAPHY
ISSN	0024-3590
EISSN	1939-5590
出版年	2020
卷号	65 期号:7 页码:1439-1455
英文摘要	Reservoirs can retain and transform carbon, nitrogen, phosphorus, and silica, but less is known about their effects on other biogeochemically relevant solutes. The salinization of freshwater ecosystems is a growing concern in many regions, and the role of reservoirs in salinity transport is an important research frontier. Here, we examine how a large desert southwest reservoir, Lake Powell, has altered the downstream transport of total dissolved solids (TDSs) as well as the dominant cations and anions comprising the TDS pool (SO42-, HCO3-, and Ca2+). Average downstream TDS concentrations have declined significantly since river impoundment and seasonal fluctuations in TDS concentrations have become more modulated, but year to year variation in TDS concentrations has remained similar. While some of the reductions in TDS concentration can be attributed to watershed management, we find that Lake Powell retains about 10% of the TDS loaded to the system (1991 Mg TDS d(-1)). Much of this retention is occurring in the forms of calcium and bicarbonate, likely via calcite precipitation, and is equivalent to an average burial of 522 mg C m(-2) d(-1), thus reducing the alkalinity of downstream water. Flow-weighted modeling suggests that, in the absence of Lake Powell, downstream salinity limits would be surpassed at the outflow to Lake Powell 41% of the time (vs. 0% of the time currently). Understanding the dominant mechanisms regulating solute transport through the reservoir is important given the relevance for downstream drinking water and irrigation concerns, biogeochemical cycling, and the high potential for reduced flows in the future.
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000506491400001
WOS关键词	FRESH-WATER ; NUTRIENT DYNAMICS ; INORGANIC CARBON ; RESERVOIRS ; PHOSPHORUS ; PHOSPHATE ; TRANSPORT ; FLOW ; ACIDIFICATION ; SEDIMENTATION
WOS类目	Limnology ; Oceanography
WOS研究方向	Marine & Freshwater Biology ; Oceanography
EI主题词	2020-01-10
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312440
作者单位	1.US Geol Survey, Southwest Biol Sci Ctr, Flagstaff, AZ 86001 USA; 2.US Geol Survey, Water Mission Area, Boulder, CO USA
推荐引用方式 GB/T 7714	Deemer, Bridget R.,Stets, Edward G.,Yackulic, Charles B.. Calcite precipitation in Lake Powell reduces alkalinity and total salt loading to the Lower Colorado River Basin[J]. United States Geological Survey,2020,65(7):1439-1455.
APA	Deemer, Bridget R.,Stets, Edward G.,&Yackulic, Charles B..(2020).Calcite precipitation in Lake Powell reduces alkalinity and total salt loading to the Lower Colorado River Basin.LIMNOLOGY AND OCEANOGRAPHY,65(7),1439-1455.
MLA	Deemer, Bridget R.,et al."Calcite precipitation in Lake Powell reduces alkalinity and total salt loading to the Lower Colorado River Basin".LIMNOLOGY AND OCEANOGRAPHY 65.7(2020):1439-1455.