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Analysis of DO Peaks at Lake Balaton: Factors Influencing Production and Respiration Rates

This study investigates dissolved oxygen (DO) measurements at Lake Balaton conducted in 2008 by Sandor Szanyi, Vera Istvanovics, and Mark Honti, focusing on system production and respiration rates. The research employs empirical equations to estimate saturation levels and atmospheric diffusion. Findings indicate that re-aeration is significantly lower than photosynthesis, with biotic processes driving diurnal variation. Anomalous DO peaks are hypothesized to stem from wind effects, probe errors, internal transport, rainfall, or wave action, highlighting the need for systematic analysis of these influences.

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Analysis of DO Peaks at Lake Balaton: Factors Influencing Production and Respiration Rates

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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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