A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data
Climate change has increased the temperature and altered the mixing regime of high-value lakes in the sub-alpine region of Northern Italy. Remote sensing of chlorophyll-a can help provide a time-series to allow an assessment of the ecological implications of this. Non-parametric multiplicative regre...
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ftdatacite:10.5281/zenodo.3997381 2023-05-15T17:34:25+02:00 A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data Free, Gary Bresciani, Mariano Pinardi, Monica Ghirardi, Nicola Luciani, Giulia Caroni, Rossana Giardino, Claudia 2020 https://dx.doi.org/10.5281/zenodo.3997381 https://zenodo.org/record/3997381 unknown Zenodo https://dx.doi.org/10.5281/zenodo.3997380 Open Access Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 info:eu-repo/semantics/openAccess CC-BY Text Journal article article-journal ScholarlyArticle 2020 ftdatacite https://doi.org/10.5281/zenodo.3997381 https://doi.org/10.5281/zenodo.3997380 2021-11-05T12:55:41Z Climate change has increased the temperature and altered the mixing regime of high-value lakes in the sub-alpine region of Northern Italy. Remote sensing of chlorophyll-a can help provide a time-series to allow an assessment of the ecological implications of this. Non-parametric multiplicative regression (NPMR) was used to visualize and understand the changes that have occurred between 2003-2018 in lakes Garda, Como, Iseo and Maggiore. In all four deep sub-alpine lakes there has been a disruption from a traditional pattern of a significant spring chlorophyll-a peak followed by a clear water phase and summer/autumn peaks. This was replaced after 2010-2012, with lower spring peaks and a tendency for annual maxima to occur in summer. There was a tendency for this switch to be interspersed by a two-year period of low chlorophyll-a, which seemed to extend until 2018 for Lake Garda. Variables that were significant in NPMR included time, air temperature, wind speed, cloud cover, winter temperature and winter values for the North Atlantic Oscillation and Eastern Atlantic pattern. The change from spring to summer chlorophyll-a maxima, relatively sudden in an ecological context, could be interpreted as a regime shift. The cause is probably cascading effects from increased winter temperatures, reduced winter mixing and altered nutrient dynamics. Future trends will depend on climate change and inter-decadal climate drivers. Text North Atlantic North Atlantic oscillation DataCite Metadata Store (German National Library of Science and Technology) |
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Climate change has increased the temperature and altered the mixing regime of high-value lakes in the sub-alpine region of Northern Italy. Remote sensing of chlorophyll-a can help provide a time-series to allow an assessment of the ecological implications of this. Non-parametric multiplicative regression (NPMR) was used to visualize and understand the changes that have occurred between 2003-2018 in lakes Garda, Como, Iseo and Maggiore. In all four deep sub-alpine lakes there has been a disruption from a traditional pattern of a significant spring chlorophyll-a peak followed by a clear water phase and summer/autumn peaks. This was replaced after 2010-2012, with lower spring peaks and a tendency for annual maxima to occur in summer. There was a tendency for this switch to be interspersed by a two-year period of low chlorophyll-a, which seemed to extend until 2018 for Lake Garda. Variables that were significant in NPMR included time, air temperature, wind speed, cloud cover, winter temperature and winter values for the North Atlantic Oscillation and Eastern Atlantic pattern. The change from spring to summer chlorophyll-a maxima, relatively sudden in an ecological context, could be interpreted as a regime shift. The cause is probably cascading effects from increased winter temperatures, reduced winter mixing and altered nutrient dynamics. Future trends will depend on climate change and inter-decadal climate drivers. |
format |
Text |
author |
Free, Gary Bresciani, Mariano Pinardi, Monica Ghirardi, Nicola Luciani, Giulia Caroni, Rossana Giardino, Claudia |
spellingShingle |
Free, Gary Bresciani, Mariano Pinardi, Monica Ghirardi, Nicola Luciani, Giulia Caroni, Rossana Giardino, Claudia A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data |
author_facet |
Free, Gary Bresciani, Mariano Pinardi, Monica Ghirardi, Nicola Luciani, Giulia Caroni, Rossana Giardino, Claudia |
author_sort |
Free, Gary |
title |
A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data |
title_short |
A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data |
title_full |
A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data |
title_fullStr |
A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data |
title_full_unstemmed |
A regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large Italian lakes from satellite data |
title_sort |
regional evaluation of the influence of climate change on long term trends in chlorophyll-a in large italian lakes from satellite data |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://dx.doi.org/10.5281/zenodo.3997381 https://zenodo.org/record/3997381 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://dx.doi.org/10.5281/zenodo.3997380 |
op_rights |
Open Access Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5281/zenodo.3997381 https://doi.org/10.5281/zenodo.3997380 |
_version_ |
1766133248436469760 |