globalchange  > 气候减缓与适应
DOI: 10.1029/2017JG004321
Scopus记录号: 2-s2.0-85047466505
论文题名:
Browning-Related Decreases in Water Transparency Lead to Long-Term Increases in Surface Water Temperature and Thermal Stratification in Two Small Lakes
作者: Pilla R.M.; Williamson C.E.; Zhang J.; Smyth R.L.; Lenters J.D.; Brentrup J.A.; Knoll L.B.; Fisher T.J.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:5
起始页码: 1651
结束页码: 1665
语种: 英语
英文关键词: climate change ; lake browning ; thermal stratification ; thermal structure ; water transparency
Scopus关键词: acidification ; air temperature ; climate change ; dissolved organic matter ; heat transfer ; lake ; long-term change ; mixing ; precipitation (climatology) ; solar radiation ; stratification ; surface water ; thermal structure ; transparency ; trend analysis ; warming ; water temperature ; Pennsylvania ; United States
英文摘要: Surface water temperatures are warming in many lakes across the globe, and this is widely attributed to warming air temperatures. Yet two lakes in Pennsylvania (USA) have shown long-term increases in surface water temperatures over the past 27 summers during a period with no significant increase in regional air temperature. We examined the relationship between long-term trends in seven metrics of whole-lake thermal structure in two lakes and several potential driver variables. Driver variables included water transparency, lake pH, and meteorological variables. Both lakes exhibited significant surface warming and hypolimnetic cooling, resulting in stronger thermal stratification that further reduced mixing and heat transfer to deep waters. During this time period, there were no long-term trends in solar radiation or in thawing degree days, but annual precipitation and lake pH increased. Water transparency greatly decreased due to increased dissolved organic matter quantity and color, most likely due to increased precipitation and recovery from anthropogenic acidification. In both lakes, the changes in lake thermal structure and heat distribution were strongly related to the decreases in water transparency and increases in dissolved organic matter. This transparency-mediated mechanism may augment the effects of air temperature-driven lake warming in other regions where decreasing transparency is also prevalent, further enhancing increases in surface water temperature and thermal stratification. These results have important ecological and biogeochemical implications, highlighting the need for investigations of multiple drivers to fully understand how lakes will respond to future climate change. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114021
Appears in Collections:气候减缓与适应

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作者单位: Department of Biology, Miami University, Oxford, OH, United States; Department of Statistics, Miami University, Oxford, OH, United States; Environmental and Urban Studies Program, Bard College, Annandale-on-Hudson, NY, United States; Center for Limnology, University of Wisconsin-Madison, Boulder Junction, WI, United States; Department of Biological Sciences, Dartmouth College, Hanover, NH, United States; Lacawac Sanctuary, Lake Ariel, PA, United States; Itasca Station and Biological Laboratories, University of Minnesota, Lake Itasca, MN, United States

Recommended Citation:
Pilla R.M.,Williamson C.E.,Zhang J.,et al. Browning-Related Decreases in Water Transparency Lead to Long-Term Increases in Surface Water Temperature and Thermal Stratification in Two Small Lakes[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(5)
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