Mean diel variability of surface energy fluxes over Manso Reservoir

Lorenzzetti, João A.; Araújo, Carlos A. S.; Curtarelli, Marcelo

doi:10.5268/iw-5.2.761

Cited by 13 publications

(10 citation statements)

References 50 publications

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“…In addition, many earlier studies that have calculated surface heat fluxes from lakes have used remotely sensed water temperature in combination with land-based meteorological measurements (Derecki 1981;Croley 1989;Lofgren and Zhu 2000) or reanalysis data (Moukomla and Blanken 2017), which can lead to erroneous estimates of air-water interactions. Studies that have calculated heat fluxes using in situ temperature and meteorology data have dealt primarily with single lakes (Laird and Kristovich 2002;MacIntyre et al 2002;Lenters et al 2005;Verburg and Antenucci 2010;Lorenzzetti et al 2015;Dias and Vissotto 2017), or a number of lakes from a confined region (Woolway et al 2015b). Prior to this investigation, no known previous studies have compared turbulent surface fluxes from continuously recorded buoy data at so many lakes across the globe and at diel, seasonal, and annual timescales.…”

Section: Discussionmentioning

confidence: 99%

Geographic and temporal variations in turbulent heat loss from lakes: A global analysis across 45 lakes

Woolway¹,

Verburg

Lenters

et al. 2018

Limnology & Oceanography

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Heat fluxes at the lake surface play an integral part in determining the energy budget and thermal structure in lakes, including regulating how lakes respond to climate change. We explore patterns in turbulent heat fluxes, which vary across temporal and spatial scales, using in situ high‐frequency monitoring data from 45 globally distributed lakes. Our analysis demonstrates that some of the lakes studied follow a marked seasonal cycle in their turbulent surface fluxes and that turbulent heat loss is highest in larger lakes and those situated at low latitude. The Bowen ratio, which is the ratio of mean sensible to mean latent heat fluxes, is smaller at low latitudes and, in turn, the relative contribution of evaporative to total turbulent heat loss increases toward the tropics. Latent heat transfer ranged from ~ 60% to > 90% of total turbulent heat loss in the examined lakes. The Bowen ratio ranged from 0.04 to 0.69 and correlated significantly with latitude. The relative contributions to total turbulent heat loss therefore differ among lakes, and these contributions are influenced greatly by lake location. Our findings have implications for understanding the role of lakes in the climate system, effects on the lake water balance, and temperature‐dependent processes in lakes.

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Section: Discussionmentioning

confidence: 99%

Geographic and temporal variations in turbulent heat loss from lakes: A global analysis across 45 lakes

Woolway¹,

Verburg

Lenters

et al. 2018

Limnology & Oceanography

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“…This global‐scale analysis has identified latitude and lake surface area as significant predictors of the variability in ABL stability over lake surfaces. Previous studies have shown evidence of a high incidence of unstable ABL conditions and its influence on the turbulent energy fluxes in individual lakes [ Verburg and Antenucci , ; Lorenzzetti et al ., ; Yusup and Liu , ]. This paper investigated the effects of geographic location and lake morphometry on ABL stability, the turbulent transfer coefficients, and on energy fluxes across the air‐water interface.…”

Section: Discussionmentioning

confidence: 99%

Latitude and lake size are important predictors of over‐lake atmospheric stability

Woolway

Verburg

Merchant

et al. 2017

Geophysical Research Letters

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Turbulent fluxes across the air‐water interface are integral to determining lake heat budgets, evaporation, and carbon emissions from lakes. The stability of the atmospheric boundary layer (ABL) influences the exchange of turbulent energy. We explore the differences in over‐lake ABL stability using data from 39 globally distributed lakes. The frequency of unstable ABL conditions varied between lakes from 71 to 100% of the time, with average air temperatures typically several degrees below the average lake surface temperature. This difference increased with decreasing latitude, resulting in a more frequently unstable ABL and a more efficient energy transfer to and from the atmosphere, toward the tropics. In addition, during summer the frequency of unstable ABL conditions decreased with increasing lake surface area. The dependency of ABL stability on latitude and lake size has implications for heat loss and carbon fluxes from lakes, the hydrologic cycle, and climate change effects.

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“…Doran et al [31] imposed a simple linear decrease of wind speed with distance to derive Equation (4). Figure 6a shows the typical diurnal cycle of the fluxes H observed during the dry season for the Brazilian Cerrado (wooded grassland, savanna) [43] and for a typical Brazilian tropical reservoir [44].…”

Section: Identification Of Lake Breeze From In Situ Datamentioning

confidence: 99%

Enhancement of Cloudless Skies Frequency over a Large Tropical Reservoir in Brazil

et al. 2020

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Several studies show the effects of lake breezes on cloudiness over natural lakes and large rivers, but only few contain information regarding large flooded areas of hydroelectric dams. Most Brazilian hydropower plants have large water reservoirs that may induce significant changes in the local environment. In this work, we describe the prevailing breeze mechanism in a Brazilian tropical hydropower reservoir to assess its impacts on local cloudiness and incoming surface solar irradiation. GOES-16 visible imagery, ISCCP database products, and ground measurement sites operated by INMET and LABREN/INPE provided data for the statistical analysis. We evaluate the cloudiness frequency assuming two distinct perspectives: spatial distribution by comparing cloudiness over the water surface and areas nearby its shores, and time analysis by comparing cloudiness prior and after reservoir completion. We also evaluated the solar irradiance enhancement over the water surface compared to the border and land areas surrounding the hydropower reservoir. The results pointed out daily average cloudiness increases moving away from the reservoir in any of the four cardinal directions. When looking at the afternoon-only cloudiness (14 h to 16 h local time), 4% fewer clouds were observed over the flooded area during summer (DJF). This difference reaches 8% during autumn (MAM) and spring (SON). Consequently, the irradiance enhancement at the water surface compared to external areas was around 1.75% for daily average and 4.59% for the afternoon-only average. Our results suggest that floating solar PV power plants in hydropower reservoirs can be an excellent option to integrate both renewable energy resources into a hybrid power generation due to the high solar irradiance in Brazilian territory combined with the prevailing breeze mechanism in large tropical water reservoirs.

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Mean diel variability of surface energy fluxes over Manso Reservoir

Cited by 13 publications

References 50 publications

Geographic and temporal variations in turbulent heat loss from lakes: A global analysis across 45 lakes

Geographic and temporal variations in turbulent heat loss from lakes: A global analysis across 45 lakes

Latitude and lake size are important predictors of over‐lake atmospheric stability

Enhancement of Cloudless Skies Frequency over a Large Tropical Reservoir in Brazil

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