Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR021977 |
Snowmelt Timing as a Determinant of Lake Inflow Mixing | |
Roberts, D. C.1,2; Forrest, A. L.1,2; Sahoo, G. B.1,2; Hook, S. J.3; Schladow, S. G.1,2 | |
2018-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:2页码:1237-1251 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Snowmelt is a significant source of carbon, nutrient, and sediment loads to many mountain lakes. The mixing conditions of snowmelt inflows, which are heavily dependent on the interplay between snowmelt and lake thermal regime, dictate the fate of these loads within lakes and their ultimate impact on lake ecosystems. We use five decades of data from Lake Tahoe, a 600 year residence-time lake where snowmelt has little influence on lake temperature, to characterize the snowmelt mixing response to a range of climate conditions. Using stream discharge and lake profile data (1968-2017), we find that the proportion of annual snowmelt entering the lake prior to the onset of stratification increases as annual snowpack decreases, ranging from about 50% in heavy-snow years to close to 90% in warm, dry years. Accordingly, in 8 recent years (2010-2017) where hourly inflow buoyancy and discharge could be quantified, we find that decreased snowpack similarly increases the proportion of annual snowmelt entering the lake at weak to positive buoyancy. These responses are due to the stronger effect of winter precipitation conditions on streamflow timing and temperature than on lake stratification, and point toward increased nearshore and near-surface mixing of inflows in low-snowpack years. The response of inflow mixing conditions to snowpack is apparent when isolating temperature effects on snowpack. Snowpack levels are decreasing due to warming temperatures during winter precipitation. Thus, our findings suggest that climate change may lead to increased deposition of inflow loads in the ecologically dynamic littoral zone of high-residence time, snowmelt-fed lakes. Plain Language Summary Winter climate conditions can affect both the timing of snowmelt and the timing of spring lake warming. Relative stream-lake temperature is an important control on how inflow plumes mix through lakes, distributing nutrients, carbon, and sediment relevant to lake ecosystems and water quality. This study examines how snow conditions have affected relative stream-lake temperature, and thus inflow mixing conditions, over the past 50 years at Lake Tahoe. Years of lower snowpack are found to favor nearshore and near-surface mixing of snowmelt inflows. Given trends toward reduced snowpack due to a warming climate, this result may indicative of future conditions in large, snowmelt-fed lakes. |
英文关键词 | snowmelt inflow mixing Lake Tahoe climate change mountain lakes limnology |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428474500032 |
WOS关键词 | WESTERN NORTH-AMERICA ; CLIMATE-CHANGE ; COOLING PONDS ; WATER ; IMPACTS ; TEMPERATURE ; RESERVOIRS ; DYNAMICS ; SNOWPACK ; CALIFORNIA |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20442 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA; 2.UC Davis, Tahoe Environm Res Ctr, Incline Village, NV 89451 USA; 3.CALTECH, Jet Prop Lab, Pasadena, CA USA |
推荐引用方式 GB/T 7714 | Roberts, D. C.,Forrest, A. L.,Sahoo, G. B.,et al. Snowmelt Timing as a Determinant of Lake Inflow Mixing[J]. WATER RESOURCES RESEARCH,2018,54(2):1237-1251. |
APA | Roberts, D. C.,Forrest, A. L.,Sahoo, G. B.,Hook, S. J.,&Schladow, S. G..(2018).Snowmelt Timing as a Determinant of Lake Inflow Mixing.WATER RESOURCES RESEARCH,54(2),1237-1251. |
MLA | Roberts, D. C.,et al."Snowmelt Timing as a Determinant of Lake Inflow Mixing".WATER RESOURCES RESEARCH 54.2(2018):1237-1251. |
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