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

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Presentation on theme: "Mysterious DO peaks at night Lake Balaton Data, 2008 Sandor Szanyi, Vera Istvanovics and Mark Honti."— Presentation transcript:

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 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 21:1022:1023:100:101:102:103:104:105:10 DO concentration [mg/l] Time

4 Strange nights: sudden steps in DO 8,5 8,7 8,9 9,1 9,3 9,5 9,7 9,9 10,1 10,3 20:3821:5023:020:141:262:383:505:02 Time DO concentration [mg/l] ? ? Hypothesis about the errorRespiration rate

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

6 The wave hypothesis 8,5 8,7 8,9 9,1 9,3 9,5 9,7 9,9 10,1 10,3 20:3821:5023:020:141:262:383:505:02 Time DO concentration [mg/l] 0,000 0,050 0,100 0,150 0,200 0,250 BSM wave height [m] computed wave height [m] and DO [mg/l] Consistency with your observations?


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