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Mysterious DO peaks at night

Mysterious DO peaks at night. Lake Balaton Data, 2008. Sandor Szanyi, Vera Istvanovics and Mark Honti. Lake Balaton DO measurements and analysis. Aim: estimate system production and respiration rate Saturation level and atmospheric diffusion estimated by empirical equations

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Mysterious DO peaks at night

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  1. Mysterious DO peaks at night • Lake Balaton Data, 2008 Sandor Szanyi, Vera Istvanovics and Mark Honti

  2. Lake Balaton DO measurements and analysis • Aim: estimate system production and respiration rate • Saturation level and atmospheric diffusion estimated by empirical equations • Reaeration was estimated to be much smaller than photosynthesis • Diurnal variation governed by biotic processes

  3. “Normal” nights: constant respiration rate after correcting for diffusion 9.00 8.50 8.00 7.50 DO concentration [mg/l] 7.00 6.50 6.00 5.50 5.00 21:10 22:10 23:10 0:10 1:10 2:10 3:10 4:10 5:10 Time

  4. Strange nights: sudden steps in DO 1 0 , 3 1 0 , 1 9 , 9 9 , 7 9 , 5 ? DO concentration [mg/l] 9 , 3 ? 9 , 1 8 , 9 8 , 7 8 , 5 2 0 : 3 8 2 1 : 5 0 2 3 : 0 2 0 : 1 4 1 : 2 6 2 : 3 8 3 : 5 0 5 : 0 2 Time Hypothesis about the error Respiration rate

  5. Possible reasons for DO peaks must be systematic immediate reaction to wind (10 minutes) not verified by gauge ? • Probe error • Internal transport • Rain • Wave action

  6. The wave hypothesis computed wave height [m] and DO [mg/l] 1 0 , 3 0 , 2 5 0 1 0 , 1 0 , 2 0 0 9 , 9 9 , 7 0 , 1 5 0 9 , 5 BSM wave height [m] DO concentration [mg/l] 9 , 3 0 , 1 0 0 9 , 1 8 , 9 0 , 0 5 0 8 , 7 8 , 5 0 , 0 0 0 2 0 : 3 8 2 1 : 5 0 2 3 : 0 2 0 : 1 4 1 : 2 6 2 : 3 8 3 : 5 0 5 : 0 2 Time Consistency with your observations?

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