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Domains of control

Domains of control. Current group: Max, Samuel, Anniina, Carola, Catherine, Kathie Progress since last meeting: Unknown? No past group members could participate in this meeting. Last DoC group focused on questions on how data frequency influenced ability to detect events.

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Domains of control

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  1. Domains of control • Current group: • Max, Samuel, Anniina, Carola, Catherine, Kathie • Progress since last meeting: • Unknown? No past group members could participate in this meeting. Last DoC group focused on questions on how data frequency influenced ability to detect events.

  2. What this DoC group covered: • General focus: Thresholds • Big picture context • Climate change will result in temperature extremes. • Climate change shifts when and where sediments and nutrients are delivered in a lake. • Pulse, disperse locally, delay • This can affect • Algal blooms/water quality, food web structure

  3. Example specific threshold question: • At what temperature differential between a river and a lake (threshold) • Do sediment and nutrient delivery shift? • Are there subsequent changes in the food web?

  4. Criteria • Dimensional volumetric relationship between river inflow and lake (ie river inputs must have an impact on the lake) • Stratification (not polymictic) • Lake data • Temp, nutrients, turbidity, wind speed, chl a/phyto • River data • Temp, nutrients, turbidity, discharge

  5. Most obvious next steps • Use empirical data to look for verification of these patterns • Lake Taupo - ?, Know it exists hydrologically, but not whether there is an effect chemically/biologically. • Vanajavesi – Anniina • Muggelsee – Carola/Rita Adrian • Predictive models for Lake Taupo, others? • Test different conditions (temperature changes, wind speed, lake:river relationships, timing and magnitude of flow) in generic lake model. • Compare different lakes

  6. Domain of control:Temperature differential between inflow and the lake

  7. unstratified stratified River = Lake River < Lake River > Lake River > Lake River flows on surface Diffusion River flows to bottom River flows on surface Blooms at the river mouth Blooms Blooms Blooms delayed Ice-covered River = Lake River > Lake River flows over ice River flows under ice

  8. Temperature differences of lake and inflow as driver of lake dynamics, e.g., productivity mixing and stratification River < Lake River > Lake River = Lake River flows to bottom River flows on surface Diffusion Spring Summer Fall Spring Summer Fall Spring Summer Fall stratified unstratified stratified unstratified stratified unstratified Blooms Blooms delayed Blooms at the river mouth Ice-covered River = Lake River > Lake River flows over ice River flows under ice

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