Past and future warming of a deep European lake (Lake Lugano): What are the climatic drivers?

Lepori, Fabio and Roberts, James J. (2015) Past and future warming of a deep European lake (Lake Lugano): What are the climatic drivers? Journal of Great Lakes Research, 41 (4). pp. 973-981. ISSN 03801330

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Abstract

We used four decades (1972–2013) of temperature data from Lake Lugano, Switzerland and Italy, to address the hypotheses that: [i] the lake has been warming; [ii] part of the warming reflects global trends and is independent from climatic oscillations and [iii] the lake will continue to warm until the end of the 21st century. During the time spanned by our data, the surface waters of the lake (0–5 m) warmed at rates of 0.2–0.9 °C per decade, depending on season. The temperature of the deep waters (50-m bottom) displayed a rising trend in a meromictic basin of the lake and a sawtooth pattern in the other basin, which is holomictic. Long-term variation in surface-water temperature correlated to global warming and multidecadal variation in two climatic oscillations, the Atlantic Multidecadal Oscillation (AMO) and the East Atlantic Pattern (EA). However, we did not detect an influence of the EA on the lake's temperature (as separate from the effect of global warming). Moreover, the effect of the AMO, estimated to a maximum of + 1 °C, was not sufficient to explain the observed temperature increase (+ 2–3 °C in summer). Based on regional climate projections, we predicted that the lake will continue to warm at least until the end of the 21st century. Our results strongly suggest that the warming of Lake Lugano is tied to global climate change. To sustain current ecosystem conditions in Lake Lugano, we suggest that management plans that curtail eutrophication and (or) mitigation of global warming be pursued.

Item Type:	Scientific journal article, Newspaper article or Magazine article
Subjects:	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:	Fabio Lepori
Date Deposited:	16 Sep 2019 05:18
Last Modified:	16 Sep 2019 05:18
URI:	http://repository.supsi.ch/id/eprint/10995

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