Mechanisms of hypolimnion erosion in a deep lake (Lago Maggiore, N. Italy)

A model approach to assess the long-term trends of indirect photochemistry in lake water. The case of Lake Maggiore (NW Italy)

“…Nitrate is also anticorrelated with sunlight, because it shows sharp maxima in autumn-winter (see Figure 2D- A clear anticorrelation is also evident, as expected, between the position of the thermocline and the sunlight intensity. The depth of the epilimnion in Lake Maggiore, and in general in the deep subalpine lakes in Northern Italy reaches the maximum at the end of the winter (Ambrosetti et al, 2010), a period characterised by low sunlight intensity.…”

Ecological effects of multiple stressors on a deep lake (Lago Maggiore, Italy) integrating neo and palaeolimnological approaches

“…Unexpectedly, we have learned that although mixing through physical convective motion has diminished so that complete homogenization of the water body has become rare, other mechanisms are able to bring oxygen to the deep hypolimnion. These mechanisms are called hypolimnion erosion (Ambrosetti et al 2010). An example is the sinking of cold, oxygenated, highly dense water from mountain tributaries down to the deep hypolimnion (Ambrosetti et al 1983;Ambrosetti 1990).…”

Lake heat content and stability variation due to climate change: coupled regional climate model (REMO)-lake model (DYRESM) analysis

“…The resulting heating of the vertical water column in turn leads to substantial changes in the physical properties of the lake (Gaiser et al, 2009;Ambrosetti et al, 2010;Braig et al 2010;Rempfer et al, 2010), more precisely in terms of mixing processes, stratification characteristics (Danis et al, 2004;Ambrosetti and Barbanti, 2005;Austin and Colman, 2008;MacIntyre et al, 2009;MacKay et al, 2009;Rimmer et al, 2011) and heat content (Hondzo and Stefan, 1993;Dokulil et al, 2006;Vetter and Sousa, 2012). Investigations dealing with these limno-physical changes are crucial, as the latter directly influence nearly all biological and chemical processes.…”