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Creators/Authors contains: "Clayer, Francois"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Environmental Data Initiative)
    Rapid changes in climate and land use are having substantial and interacting impacts on lake water quality around the world. Here, we synthesized time-series data for dissolved oxygen, temperature, chlorophyll-a, total phosphorus, total nitrogen, and dissolved organic carbon at multiple depths in 822 lakes to facilitate analyses of these changes. The dataset extends from 1921–2022, with a median data duration of 29 years (range 5-102) and a median of 5 unique sampling dates per year at each lake. Lakes in the dataset have a median depth of 12.5 m (range 1.5–480 m), median surface area of 85.4 ha (range: 0.5–237000 ha) and median elevation of 264 m (range: -215–2804). The lakes are located in 18 countries across 5 continents, with latitudes ranging from -42.6 to 68.3. To facilitate interoperability with other large-scale datasets, each lake is linked to a unique hydroLAKES lake ID when possible (n = 683). 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Limnology and Oceanography Letters)
    Abstract Lakes play a significant role in the global carbon cycle, acting as sources and sinks of carbon dioxide (CO2). In situ measurements of CO2flux (FCO2) from lakes have generally been collected during daylight, despite indications of significant diel variability. This introduces bias when scaling up to whole‐lake annual aquatic carbon budgets. We conducted an international sampling program to ascertain the extent of diel variation in FCO2across lakes. We sampled 21 lakes over 41 campaigns and measured FCO2at 4‐h intervals over a full diel cycle. Rates of FCO2ranged from −3.16 to 4.39 mmol m−2 h−1. Integrated over a day, FCO2ranged from −381.68 to 878.49 mg C m−2d−1(mean = 76.54) across campaigns. We identified three characteristic diel patterns in FCO2related to trophic status and show that for half of the campaigns, daily flux estimates were biased by > 50% if based on a single (daytime) measurement. 
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