Impact Factor (IF) - Thomson Reuters Web of KnowledgeSM)

2018: 1.152 - 5 years IF: 1.315

2017: 1.000 - 5 years IF: 1.000

2016: 0.938 - 5 years IF: 1.010

2015: 0.641 - 5 years IF: 0.673

2014: 0.628 - 5 years IF: 0.652

2013: 0.390 - 5 years IF: 0.504

2012: 0.605

2011: 0.468

2010: 0.309

2009: 0.136

An international Journal published under the auspices of:

Recognized by:

Volume 5 (1) - 1982


Unusual deep mixing of Lago Maggiore during the winter 1980-1981

Pages 183-191


The main hydrodynamic characteristic of L. Maggiore, as well as the other deep sudalpine lakes, is their oligomixis, i.e., full circolation, with the consequent thermal and chemical homogeneity of the whole water column, does not occur every year. Since 1960, this situation has been observed only in the late winter of 1963, 1970 and 1981. The last occurrence was particularly well studied, with weekly measurements of the vertical distribution of temperature and oxygen concentrations, supplemented by monthly analyses of the main chemical variables. The results showed at the beginning ol February a wind induced drift of superficial water and a deep water counter current with the formation of a three layers situation: the superficial mass, from a depth of 0 to 120 m, with an oxygen concentration of 8,5-9,0 mg 1-1; a middle layer (120-220 m), with a concentration of 6,5 mg 1-1, and a lower layer (220- 370 m), with a concentration of 9,0 mg 1-1, well above the values measured on 23rd. Jannuary, which ranged from 5,7 mg and 6.6 mg 1-1. This situation was observed also at other points of the lake, which indicates a “coveryor belt” mechanism of circulation. In the subsequent days the wind and the convective movementes caused a progressive oxygenation of the water mass down to 200m. In this paper the water mass dynamic are discussed in relation to the main meteorological and hydrological variables, as well as the morphology of the lake.

→ Download Abstract PDF

→ Download Full Text PDF