The role of stratification on lakes' thermal response: The case of <scp>L</scp>ake <scp>S</scp>uperior

Piccolroaz, Sebastiano; Toffolon, Marco; Majone, Bruno

doi:10.1002/2014wr016555

Cited by 81 publications

(124 citation statements)

References 45 publications

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“…This is supported by a high correlation between LSTs in March and July according to both GLSEA2 ( r = 0.77) and the CTRL simulation ( r = 0.68) during 1995–2012. In contrast, Piccolroaz et al () found that winter conditions explain only 22% of the July warming from 1997 to 1998. The extra heat accumulated during the antecedent winter supports an earlier lake stratification in 1998, compared to 1997.…”

Section: Drivers Of Increased Lst: Antecedent Winter Lake Conditions mentioning

confidence: 90%

“…Potential drivers of global lake warming may include changes in large‐scale meteorological forcings (e.g., air temperature and solar radiation), internal lake processes (e.g., changes in lake ice cover and timing of stratification), and lake eutrophication in response to land use and resulting sedimentation (Austin and Colman ; Adrian et al ; Wang et al ; Wild ; Fink et al ; Dokulil et al ; Piccolroaz et al ). The warming of European lakes has been attributed to increases in both air temperature and incoming solar radiation (Arvola et al ; Fink et al ).…”

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confidence: 99%

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Recent accelerated warming of the Laurentian Great Lakes: Physical drivers

et al. 2016

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The primary drivers of the recent accelerated warming of the Laurentian Great Lakes from 1982 to 2012 are explored through observations, remote sensing, and regional climate model experiments. The study focuses on the abrupt warming from 1997 to 1998 as a proxy for the long‐term warming trend. The lake surface warming has been heterogeneous in both space and time, ranging from moderate warming in late spring over the southern lakes and shallow areas of the northern lakes to strong warming in mid‐summer over the northern, deep lake areas. The greatest lake warming between 1997 and 1998 occurs over the deepest areas of Lake Superior during mid‐summer, primarily arising from enhanced heat accumulation during the mild winter of 1997/1998 and amplified by greater incoming surface solar radiation and air temperature during the spring of 1998, according to model experiments. The mild winter condition, together with the increased solar radiation and air temperature during spring, causes an earlier onset of springtime stratification, resulting in enhanced heat absorption by surface water and thereby contributing to lake surface warming during the subsequent summer in 1998 compared with 1997. In contrast, the modest peak warming over southern lakes and shallow areas of northern lakes from 1997 to 1998 is a rapid response to synchronous increases in solar radiation and air temperature during May between the 2 yr. Changes in antecedent wintertime lake ice cover are found to have played only a minor role in the accelerated warming trend of the Laurentian Great Lakes.

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Section: Drivers Of Increased Lst: Antecedent Winter Lake Conditions mentioning

confidence: 90%

mentioning

confidence: 99%

Recent accelerated warming of the Laurentian Great Lakes: Physical drivers

et al. 2016

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“…6). Piccolroaz et al (2015) showed that an increase in lake stability and earlier onset of stratification causes warming of surface waters due to the smaller volume undergoing warming and diminished heat transfer to the hypolimnion. The lake model used here showed an increase in stratification strength and a lengthening of the stratified period in both lakes (Table 5; Fig.…”

Section: Lakesmentioning

confidence: 99%

Tributaries affect the thermal response of lakes to climate change

Vinnå¹,

Wüest

Zappa

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. Thermal responses of inland waters to climate change varies on global and regional scales. The extent of warming is determined by system-specific characteristics such as fluvial input. Here we examine the impact of ongoing climate change on two alpine tributaries, the Aare River and the Rhône River, and their respective downstream peri-alpine lakes: Lake Biel and Lake Geneva. We propagate regional atmospheric temperature effects into river discharge projections. These, together with anthropogenic heat sources, are in turn incorporated into simple and efficient deterministic models that predict future water temperatures, river-borne suspended sediment concentration (SSC), lake stratification and river intrusion depth/volume in the lakes. Climate-induced shifts in river discharge regimes, including seasonal flow variations, act as positive and negative feedbacks in influencing river water temperature and SSC. Differences in temperature and heating regimes between rivers and lakes in turn result in large seasonal shifts in warming of downstream lakes. The extent of this repressive effect on warming is controlled by the lakes hydraulic residence time. Previous studies suggest that climate change will diminish deep-water oxygen renewal in lakes. We find that climaterelated seasonal variations in river temperatures and SSC shift deep penetrating river intrusions from summer towards winter. Thus potentially counteracting the otherwise negative effects associated with climate change on deep-water oxygen content. Our findings provide a template for evaluating the response of similar hydrologic systems to on-going climate change.

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“…Climate change has been shown to exert a strong influence on thermal dynamics of waters worldwide (Fink, Schmid, Wahl, Wolf, & Wuest, ; Jansen ; O'Reilly & Sharma ; Piccolroaz, Toffolon, & Majone, ; Piccolroaz et al, ; Wood, Wherry, Piccolroaz, & Girdner, ). Kraemer, Anneville, and Chandra () used a 1D hydrodynamic model to investigate the impacts of atmospheric warming on the thermal structure of Lake Geneva.…”

Section: Introductionmentioning

confidence: 99%

Episodic wind events induce persistent shifts in the thermal stratification of a reservoir (Rappbode Reservoir, Germany)

Frassl

Boehrer

et al. 2018

Internat Rev Hydrobiol

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Stratification dynamics in reservoirs have a great impact on ecosystem functioning and biogeochemical cycling, and can be strongly influenced by wind events. In this study, a well‐established one‐dimensional hydrodynamic model (GLM) was used to investigate the response of stratification dynamics in Rappbode Reservoir to different wind conditions, in particular to episodic strong wind events. In years with increased wind speed, stratification duration and intensity were reduced. Episodic wind forcing by strong wind events are important determinants of thermal structure and can induce persisting shifts in the thermal structure that remain over the season until the next overturn. The results showed that reductions in stratification intensity were particularly distinct when the strong wind occurred in early summer. Strong wind events outside of this sensitive time window did not exert an important impact on the thermal dynamics of the reservoir. Our research confirms the decisive impact of wind speed on stratification of lakes and reservoirs. It effectively illustrates the sensitive time window of thermal dynamics to episodic wind events.

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The role of stratification on lakes' thermal response: The case of Lake Superior

Cited by 81 publications

References 45 publications

Recent accelerated warming of the Laurentian Great Lakes: Physical drivers

Recent accelerated warming of the Laurentian Great Lakes: Physical drivers

Tributaries affect the thermal response of lakes to climate change

Episodic wind events induce persistent shifts in the thermal stratification of a reservoir (Rappbode Reservoir, Germany)

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