Impact of Global and Local Pressures on the Ecology of a Medium-Sized Pre-Alpine Lake

Carraro, Elisa; Guyennon, Nicolas; Viviano, Gaetano; Manfredi, Emanuela Chiara; Valsecchi, Lucia; Salerno, Franco; Tartari, Gianni; Copetti, Diego

doi:10.1016/b978-0-444-59396-2.00016-x

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…The Mann-Kendall test (MK) (Mann, 1945;Kendall, 1975) is widely used to assess significant trends in hydro-meteorological time series (e.g., Zhang et al, 2000;Yue and Wang, 2002;Carraro et al, 2012aCarraro et al, , 2012bGuyennon et al, 2013). This test is non-parametric and is therefore less sensitive to extreme sample values.…”

Section: Analysis Of Climatic Trendsmentioning

confidence: 99%

High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles–Cevedale mountain group (Southern Alps, Italy) over the last 50years

Salerno

Gambelli

Viviano

et al. 2014

Global and Planetary Change

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Section: Analysis Of Climatic Trendsmentioning

confidence: 99%

High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles–Cevedale mountain group (Southern Alps, Italy) over the last 50years

Salerno

Gambelli

Viviano

et al. 2014

Global and Planetary Change

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“…The selected infilling method is a simple regression analysis based on quantile mapping (e.g., Déqué, 2007;Themeßl et al, 2012). This regression method has been preferred to more complex techniques, such as the fuzzy rule-based approach (Abebe et al, 2000) or the artificial neural networks (Abudu et al, 2010;Coulibaly and Evora, 2007), considering the peculiarity of this case study. In fact, all stations are located in the same valley (Khumbu Valley).…”

Section: Reconstruction Of the Daily Temperature And Precipitation Timentioning

confidence: 99%

Weak precipitation, warm winters and springs impact glaciers of south slopes of Mt. Everest (central Himalaya) in the last 2 decades (1994–2013)

et al. 2015

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Abstract. Studies on recent climate trends from the Himalayan range are limited, and even completely absent at high elevation (> 5000 m a.s.l.). This study specifically explores the southern slopes of Mt. Everest, analyzing the time series of temperature and precipitation reconstructed from seven stations located between 2660 and 5600 m a.s.l. during 1994–2013, complemented with the data from all existing ground weather stations located on both sides of the mountain range (Koshi Basin) over the same period. Overall we find that the main and most significant increase in temperature is concentrated outside of the monsoon period. Above 5000 m a.s.l. the increasing trend in the time series of minimum temperature (+0.072 °C yr−1) is much stronger than of maximum temperature (+0.009 °C yr−1), while the mean temperature increased by +0.044 °C yr−1. Moreover, we note a substantial liquid precipitation weakening (−9.3 mm yr−1) during the monsoon season. The annual rate of decrease in precipitation at higher elevations is similar to the one at lower elevations on the southern side of the Koshi Basin, but the drier conditions of this remote environment make the fractional loss much more consistent (−47% during the monsoon period). Our results challenge the assumptions on whether temperature or precipitation is the main driver of recent glacier mass changes in the region. The main implications are the following: (1) the negative mass balances of glaciers observed in this region can be more ascribed to a decrease in accumulation (snowfall) than to an increase in surface melting; (2) the melting has only been favoured during winter and spring months and close to the glaciers terminus; (3) a decrease in the probability of snowfall (−10%) has made a significant impact only at glacier ablation zone, but the magnitude of this decrease is distinctly lower than the observed decrease in precipitation; (4) the decrease in accumulation could have caused the observed decrease in glacier flow velocity and the current stagnation of glacier termini, which in turn could have produced more melting under the debris glacier cover, leading to the formation of numerous supraglacial and proglacial lakes that have characterized the region in the last decades.

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“…Lake Pusiano reached its maximum trophic state in the mid-1980s when maximum TP concentrations of ~200 μg L −1 were measured at winter overturn (Carraro et al 2012b). Subsequently, TP concentrations reduced by one order of magnitude to the current value of 23 μg L −1 measured in both 2014 and 2015 ( Fig.…”

Section: Evolution Of the Trophic Statementioning

confidence: 85%

Restoring lakes through external phosphorus load reduction: the case of Lake Pusiano (Southern Alps)

et al. 2017

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We estimated the external phosphorus load (EPL) between 1960 and 2015 in Lake Pusiano, a midsized subalpine lake that reached its maximum trophic state in the mid-1980s. Using historical data we also estimated the internal phosphorus load (IPL) between 1972 and 2015. EPL reached its maximum in the mid-1980s with phosphorus (P) values ~21 t yr −1 compared to the current value close to 6 t yr −1. IPL was one order of magnitude less and ranged between 0.25 t yr −1 (2015) and 3.6 (1985) t yr −1. The strong reduction of the P load determined a marked decrease of both P (from 200 to 23 μg L −1) and chlorophyll a (from 18 to 8 μg L −1) in-lake concentrations. The process of eutrophication and subsequent recovery, however, showed hysteresis between P load and in-lake P concentrations. In recent years, in particular, the P concentrations at winter overturn seem to be independent from the P load, related to modifications in the hydrological management of the lake that favored P flushout in October-November, when the EPL is maximal. This process led to a marked decrease of the total P concentrations at winter overturn (23 μg L −1), which recently resulted in lower-than-target concentrations (30 μg L −1) established by the Lombardy Region. The lake, nevertheless, suffers from the presence of the toxic cyanobacterium Planktothrix rubescens, and eradicating this species and further improving water quality will likely require an additional abatement of the EPL.

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Impact of Global and Local Pressures on the Ecology of a Medium-Sized Pre-Alpine Lake

Cited by 5 publications

References 36 publications

High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles–Cevedale mountain group (Southern Alps, Italy) over the last 50years

High alpine ponds shift upwards as average temperatures increase: A case study of the Ortles–Cevedale mountain group (Southern Alps, Italy) over the last 50years

Weak precipitation, warm winters and springs impact glaciers of south slopes of Mt. Everest (central Himalaya) in the last 2 decades (1994–2013)

Restoring lakes through external phosphorus load reduction: the case of Lake Pusiano (Southern Alps)

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