EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2021 | 8:30 AM - 10:30 AM | Temporal dynamics in the physico-chemistry of a high alpine stream network | Virtual Platform
Temporal dynamics in the physico-chemistry of a high alpine stream network
Macun lakes is an alpine (>2600 m asl) cirque landscape in the Swiss National Park comprising 26 small lakes with interconnecting streams. The drainage network consists of a North and South basin influenced by rock glaciers overlying an ortho-gneiss, meta-granitoid bedrock. Physico-chemistry of surface waters have been monitored annually in mid-summer since 2001, including an Exosonde employed since 2016 at the lowest lake. Results showed clear physico-chemical differences between the two basins that reflect rock glacier inputs in the South basin. Nitrogen values were two-fold higher and particulate phosphorus values two-fold lower in the South than North basin. Physico-chemistry in the two basins became more homogeneous over time with reduced rock glacial inputs in the South basin and a general decrease in nitrogen. North basin streams were ca. 3°C warmer than South basin streams, but with high inter-annual variation reflecting annual differences in climate and no evidence of a general temporal trend (increase or decrease). Exosonde data revealed strong seasonality and diel variability in measured parameters (dissolved oxygen, temperature, chlorophyll-a); the latter being most pronounced in summer. Results highlight the importance of long-term monitoring towards understanding changes in alpine freshwaters.
- Ecohydrology
- Nutrients
- Landscape
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Presenters/Authors
Chris Robinson
(), Eawag, robinson@eawag.ch;
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Christa Jolidon
(), Eawag, jolidon@eawag.ch;
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Simon Bloem
(), Eawag, bloem@eawag.ch;
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Christian Ebi
(), Swiss Federal Institute of Aquatic Science and Technology, EAWAG, Urban Water Management dpt., christian.ebi@eawag.ch ;
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