2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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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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