Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Forecasting the evolution in the mixing regime of a deep subalpine lake under climate change scenarios through numerical modelling (Lake Maggiore, Northern Italy/Southern Switzerland) |
| Abstract | The impact of air temperature rise is eminent for the large deep lakes in the Italian subalpine district, climate change being caused there by both natural phenomena and anthropogenic greenhouse-gases (GHG) emissions. These oligomictic lakes are experiencing a decrease in the frequency of winter full turnover and an intensification of stability. As a result, hypolimnetic oxygen concentrations are decreasing and nutrients are accumulating in bottom water, with effects on the whole ecosystem functioning. Forecasting the future evolution of the mixing pattern is relevant to assess if a reduction in GHG releases would be able to revert such processes. The study focuses on Lake Maggiore, for which the thermal structure evolution under climate change in the 2016-2085 period was assessed through numerical simulations, performed with the General Lake Model (GLM). Different prospects of regional air temperature rise were considered, given by the Swiss Climate Change Scenarios CH2011. Multiple realisations were performed for each scenario to obtain robust statistical predictions, adopting random series of meteorological data produced with the Vector-Autoregressive Weather Generator (VG). Results show that a reversion in the increasing thermal stability would be possible only if global GHG emissions started to be reduced by ~ 2020, allowing an equilibrium mixing regime to be restored by the end of the twenty-first century. Otherwise, persistent lack of complete-mixing, severe water warming and extensive effects on water quality are to be expected for the centuries to come. These projections can be extended to the other lakes in the subalpine district. |
| Source | Climate dynamics 51 (9-10), pp. 3521–3536 |
| Keywords | Climate change impactFull turnoverHydrodynamic modellingInland waters warmingSwiss climate change scenarios CH2011Weather generator |
| Journal | Climate dynamics |
| Editor | Springer., Berlin;, Germania |
| Year | 2018 |
| Type | Articolo in rivista |
| DOI | 10.1007/s00382-018-4094-6 |
| Authors | Fenocchi A.; Rogora M.; Sibilla S.; Ciampittiello M.; Dresti C. |
| Text | 392825 2018 10.1007/s00382 018 4094 6 Scopus 2 s2.0 85041105371 ISI Web of Science WOS 000447366100020 Climate change impact Full turnover Hydrodynamic modelling Inland waters warming Swiss climate change scenarios CH2011 Weather generator Forecasting the evolution in the mixing regime of a deep subalpine lake under climate change scenarios through numerical modelling Lake Maggiore, Northern Italy/Southern Switzerland Fenocchi A.; Rogora M.; Sibilla S.; Ciampittiello M.; Dresti C. Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, Pavia, 27100, , Italy; CNR Institute of Ecosystem Study, Largo Tonolli 50, Verbania Pallanza, 28922, , Italy The impact of air temperature rise is eminent for the large deep lakes in the Italian subalpine district, climate change being caused there by both natural phenomena and anthropogenic greenhouse gases GHG emissions. These oligomictic lakes are experiencing a decrease in the frequency of winter full turnover and an intensification of stability. As a result, hypolimnetic oxygen concentrations are decreasing and nutrients are accumulating in bottom water, with effects on the whole ecosystem functioning. Forecasting the future evolution of the mixing pattern is relevant to assess if a reduction in GHG releases would be able to revert such processes. The study focuses on Lake Maggiore, for which the thermal structure evolution under climate change in the 2016 2085 period was assessed through numerical simulations, performed with the General Lake Model GLM . Different prospects of regional air temperature rise were considered, given by the Swiss Climate Change Scenarios CH2011. Multiple realisations were performed for each scenario to obtain robust statistical predictions, adopting random series of meteorological data produced with the Vector Autoregressive Weather Generator VG . Results show that a reversion in the increasing thermal stability would be possible only if global GHG emissions started to be reduced by 2020, allowing an equilibrium mixing regime to be restored by the end of the twenty first century. Otherwise, persistent lack of complete mixing, severe water warming and extensive effects on water quality are to be expected for the centuries to come. These projections can be extended to the other lakes in the subalpine district. 51 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85041105371 partnerID=q2rCbXpz Articolo 2018_Climate_Dynamics_51_3521_3536.pdf Articolo in rivista Springer. 0930 7575 Climate dynamics Climate dynamics Clim. dyn. Climate dynamics Print claudia.dresti DRESTI CLAUDIA marzia.ciampittiello CIAMPITTIELLO MARZIA michela.rogora ROGORA MICHELA |