Bulgheroni, Monica and Lepori, Fabio and Pozzoni, Maurizio and Capelli, Camilla and Pera Ibarguren, Sebastian and Scapozza, Cristian and Colombo, Luca (2018) Reconstructing long-term trends in surface water summer temperature in a high-altitude lake: A modelling approach. In: 16th Swiss Geoscience Meeting, 30thNovember – 1st December 2018, Bern.
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Abstract
During the last century, climate change has lad to the warming of lakes worldwide (Schneider & Hook 2010), with lakes in the Alpine region warming at particularly high rates. While temperature trends in large lowland lakes have been thoroughly studied thanks to the availability of historical data series of water temperature (either measured or reconstructed from infrared satellite data; Lepori & Roberts 2015; Pareeth et al. 2017), so far, the analysis of long-term temperature patterns in high-altitude lakes has been hampered by a dearth of data. In this study, we developed a mathematical model to reconstruct a long-term series of surface-water temperature of a high lake located in the Northwestern Alps where a monitoring program has been recently established (Lago Nero, Canton Ticino, 2385 m asl). The model, based on a simplified heat budget and spatially-interpolated meteorological conditions, was calibrated and validated using recent data (monthly and daily temperatures, Figure 1) and subsequently used to simulate summer surface-water temperatures from the early 1900s. Preliminary results indicate a warming trend, but also suggest that the warming has been irregular in time and affected different indicators of thermal conditions (minimum, maximum, mean) in different ways. These patterns, which will be analysed further, suggest probable increases of thermal stress to cold-water organisms and alterations of lake-ecosystem function. Figure 1. Daily evolution of summer and autumn surface temperature of the lago Nero.
| Item Type: | Article in conference proceedings or Presentation at a conference (Poster) |
|---|---|
| Subjects: | Physical sciences > Science of aquatic & terrestrial environments > Environmental sciences > Hydrology Physical sciences > Science of aquatic & terrestrial environments > Climatology > Climate & climate change Physical sciences > Science of aquatic & terrestrial environments > Science of aquatic & terrestrial environments not elsewhere classified |
| Department/unit: | Dipartimento ambiente costruzioni e design > Istituto scienze della Terra |
| Depositing User: | Maurizio Pozzoni |
| Date Deposited: | 16 Dec 2019 06:08 |
| Last Modified: | 16 Dec 2019 06:08 |
| URI: | http://repository.supsi.ch/id/eprint/11323 |
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