Step 1: Submit Revised Calibration Parmeters for Next Scheduled Model Run
Step 2 (Optional): Start Model With New Measured Profile Data
Sheltering Factor: Some lakes are protected by trees or are located in a valley and do not receive much wind
Other lakes are out on the plains and are constantly windblown.
Whether a lake is protected or windblown can affect how that lake mixes. The "Sheltering Factor" parameter determines the depth of the mixed layer which starts at the lake surface and goes a certain depth into the lake water column. In the mixed layer, all the temperatures are the same. Use the profile tool on the "Check It" page to see if your lake temperature measurements match up with the profile generated by the model.
A Sheltering Factor >1 will result in a more shallow mixed layer and warmer surface temperatures. Sheltering Factors < 1 will increase lake mixing and lead to a deeper mixed layer and overall colder surface temperatures.
Lake Clarity Factor
Lake Clarity Factor: The technical name for this is the extinction coefficient and it determines how deep sunlight penetrates into a lake.
The starting point for an extinction coefficent is 0.45. If a value >0.45 is used, more sunlight will be absorbed in the surface layers of the lake and less will penetrate into the lake. A value <0.45 will leed to sunlight reaching greater depths. This affects how lakes stratify and where the thermocline developes.
Very clear lakes have extinction coefficents of around 0.3 (Lake Tahoe's extinction coefficient is 0.12) whereas very turbid lakes have extenction coefficients of 0.8. We suggest starting with 0.45 and make small changes from that point.
Internal Mixing: The technical name for this is advection-dispersion and it determines how lakes mix below the mixed layer
The user is advised to start with the default value of 1 and make small changes (factor of 0.1) and seee how this affects the lake temperature profile.
Water Temperature Control Factor
Lake Name: You can use any name you want, but we suggest you use the lakes' actual name.
Leave out the "Lake" part of the name, for example use Nokomis for Lake Nokomis.
The lake name will be compbined with the input you use in the next box, resulting in a unique identifier for your lake.