Attenuation of photosynthetically active radiation and ultraviolet radiation in response to changing dissolved organic carbon in browning lakes: Modeling and parametrization

Pilla, Rachel M.; Couture, Raoul-Marie

doi:10.1002/lno.11753

Cited by 16 publications

(8 citation statements)

References 56 publications

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“…The biogeochemistry of organic matter in lake ice is another area of uncertainty, yet may play an important role in aquatic ecosystems. Dissolved organic carbon (DOC) supports heterotrophic growth, and its colored fraction (CDOM) alters contaminant toxicity and nutrient availability (Williamson et al., 1999) and attenuates light penetration in the water (Laurion et al., 1997; Thrane et al., 2014), which affects primary production (Arrigo & Brown, 1996), thermal stratification and oxygen dynamics (Pilla & Couture, 2021). Despite the central role that organic carbon plays in the aquatic ecosystems, very few studies have been conducted on this component in lake ice.…”

Section: Introductionmentioning

confidence: 99%

Hidden Stores of Organic Matter in Northern Lake Ice: Selective Retention of Terrestrial Particles, Phytoplankton and Labile Carbon

et al. 2021

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Over the last few decades, global warming has led to widespread shrinking of the cryosphere and has brought a sense of urgency toward the study of ice habitats. One of the most heavily impacted cryospheric habitats is freshwater ice. Climate change is leading to substantial reductions in the thickness and duration of lake and river ice cover worldwide (Sharma et al., 2019;Wrona et al., 2016). In the northern hemisphere, ice in lakes and rivers freezes an average of 5.8 days later and melts 6.5 days earlier than 100 years ago, based on the measurements taken between the years 1846and 1995(Magnuson, et al., 2000. Global air temperatures increased 1.2°C during this period. The majority of boreal and Arctic lakes are still ice-covered for six to ten months a year, and the potential importance of this cold and dark period on ecosystem structure and function is increasingly recognized (Grosbois & Rautio, 2018;Hampton et al., 2017;Schneider et al., 2017). Considering that ice-covered lakes include nearly 50% of the world's lakes, there is a pressing Abstract Around 50% of the world's lakes freeze seasonally, but the duration of ice-cover is shortening each year and this is likely to have broad limnological consequences. We sampled freshwater ice and the underlying water in 19 boreal and polar lakes to evaluate whether lake ice contains an inoculum of algae, nutrients, and carbon that may contribute to lake ecosystem productivity. Boreal and Arctic lakes differed in ice duration (6 vs. >10 months), thickness (70 vs. 190 cm), and quality (predominantly snow ice vs. black ice), but in all lakes, there were consistent differences in biological and biogeochemical composition between ice and water. Particulate fractions were often more retained while most dissolved compounds were excluded from the ice; for example, the ice had more terrestrial particulate carbon, measured as fatty acid biomarkers (averages of 1.1 vs. 0.3 µg L −1 ) but lower dissolved organic carbon (2.2 vs. 5.7 mg C L −1 ) and inorganic phosphorus concentrations (4.0 vs. 7.5 µg C L −1 ) than the underlying water. The boreal ice further had three times higher chlorophyll-a, than the water (0.9 vs. 0.3 µg L −1 ). Of the dissolved fractions, the contribution of protein-like compounds was higher in the ice, and this in all lakes. These labile compounds would become available to planktonic microbes when the ice melts. Our results show that freshwater ice has an underestimated role in storage and transformation in the biogeochemical carbon cycle of ice-covered lake ecosystems.Plain Language Summary Winter ice cover of 1-2 m thickness can comprise 20%-70% of the total lake depth in boreal and Arctic lakes. While sea ice is known to contain substantial quantities of carbon and organisms that at ice melt contribute to biological production in the underlying water column, little is known about the composition of lake ice and its role in storage of organic carbon. Our analyses of 19 boreal and Arctic lakes revealed large but different stores of organic material in lake ...

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Section: Introductionmentioning

confidence: 99%

Hidden Stores of Organic Matter in Northern Lake Ice: Selective Retention of Terrestrial Particles, Phytoplankton and Labile Carbon

et al. 2021

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“…Daily meteorological data were collected from an on‐lake weather station from Lake Lacawac, which is 16.6 km from Lake Giles. These data have been used effectively as a surrogate for meteorology at Lake Giles in previous studies (Williamson et al 2015; Pilla et al 2018; Pilla and Couture 2021). Daily averages from 1997 through 2020 were used for precipitation (mm d −1 ), wind speed at 2 m (m s −1 ), relative humidity (%), and air pressure (hPa).…”

Section: Methodsmentioning

confidence: 99%

“…We calibrated the model against the default location of Lake Giles using empirical high‐frequency daily‐averaged surface (0.5 m) and bottom (22 m) water temperature data measured from Precision Measurement Engineering miniDOT sensors during 11 August 2017 through 05 May 2020. Due to previously known model issues with MyLake capturing ice breakup during the spring of 2018 (Pilla and Couture 2021), we removed data during March 2018 from the calibration routine in order to minimize model bias of temperature data for this month, resulting in a total of n = 1735 daily water temperature measurements used during calibration. The Nelder–Mead simplex calibration routine (Box 1965; Nelder and Mead 1965) from the “nloptr” package in R (Johnson 2018) optimized the root mean squared error of the surface and bottom water temperatures, with a final value of 1.83°C, which is within range of that found for another recent modeling application of MyLake at Lake Giles using high‐frequency water temperature data (Pilla and Couture 2021).…”

Section: Methodsmentioning

confidence: 99%

Earlier ice breakup induces changepoint responses in duration and variability of spring mixing and summer stratification in dimictic lakes

Pilla¹,

Williamson

2021

Limnology & Oceanography

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Reductions in ice cover duration and earlier ice breakup are two of the most prevalent responses to climate warming in lakes in recent decades. In dimictic lakes, the subsequent periods of spring mixing and summer stratification are both likely to change in response to these phenological changes in ice cover. Here, we used a modeling approach to simulate the effect of changes in latitude on long-term trends in duration of ice cover, spring mixing, and summer stratification by "moving" a well-studied lake across a range of latitudes in North America (35.2 N to 65.7 N). We found a changepoint relationship between the timing of ice breakup vs. spring mixing duration on 09 May. When ice breakup occurred before 09 May, which routinely occurred at latitudes < 47 N, spring mixing was longer and more variable; when ice breakup occurred after 09 May at latitudes > 47 N, spring mixing averaged 1 day with low variability. In contrast, the duration of summer stratification showed a relatively slower rate of increase when ice breakup occurred before 09 May (< 47 N) compared to a 109% faster rate of increase when ice breakup was after 09 May (> 47 N). Projected earlier ice breakup can result in important nonlinear changes in the relative duration of spring mixing and summer stratification, which can lead to mixing regime shifts that influence the severity of oxygen depletion differentially across latitudes.

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“…MyLake runs at a daily time step using regularly spaced water layers whose vertical resolution is defined by the user. Different versions of the open-source code have been applied to simulate algal blooms (Moe et al, 2016), CO 2(g) and CH 4(g) (Kiuru et al, 2019), internal phosphorus loads (Markelov et al, 2019), and light attenuation dynamics (Pilla and Couture, 2021).…”

Section: Lake Models For Local Simulationsmentioning

confidence: 99%

A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector

et al. 2022

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Abstract. Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to plan for the likely impacts. Previous studies of the impacts of climate change on lakes have often relied on a single model forced with limited scenario-driven projections of future climate for a relatively small number of lakes. As a result, our understanding of the effects of climate change on lakes is fragmentary, based on scattered studies using different data sources and modelling protocols, and mainly focused on individual lakes or lake regions. This has precluded identification of the main impacts of climate change on lakes at global and regional scales and has likely contributed to the lack of lake water quality considerations in policy-relevant documents, such as the Assessment Reports of the Intergovernmental Panel on Climate Change (IPCC). Here, we describe a simulation protocol developed by the Lake Sector of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) for simulating climate change impacts on lakes using an ensemble of lake models and climate change scenarios for ISIMIP phases 2 and 3. The protocol prescribes lake simulations driven by climate forcing from gridded observations and different Earth system models under various representative greenhouse gas concentration pathways (RCPs), all consistently bias-corrected on a 0.5∘ × 0.5∘ global grid. In ISIMIP phase 2, 11 lake models were forced with these data to project the thermal structure of 62 well-studied lakes where data were available for calibration under historical conditions, and using uncalibrated models for 17 500 lakes defined for all global grid cells containing lakes. In ISIMIP phase 3, this approach was expanded to consider more lakes, more models, and more processes. The ISIMIP Lake Sector is the largest international effort to project future water temperature, thermal structure, and ice phenology of lakes at local and global scales and paves the way for future simulations of the impacts of climate change on water quality and biogeochemistry in lakes.

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Attenuation of photosynthetically active radiation and ultraviolet radiation in response to changing dissolved organic carbon in browning lakes: Modeling and parametrization

Cited by 16 publications

References 56 publications

Hidden Stores of Organic Matter in Northern Lake Ice: Selective Retention of Terrestrial Particles, Phytoplankton and Labile Carbon

Hidden Stores of Organic Matter in Northern Lake Ice: Selective Retention of Terrestrial Particles, Phytoplankton and Labile Carbon

Earlier ice breakup induces changepoint responses in duration and variability of spring mixing and summer stratification in dimictic lakes

A framework for ensemble modelling of climate change impacts on lakes worldwide: the ISIMIP Lake Sector

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