process_lake_temp: Process lake temperature data for calcs
In WDNR-Water-Use/CSLSchem: CSLS Water Chemistry Analysis

Description Usage Arguments Details Value

Processes CSLS lake temperature data for water/solute balance calculations. Filters HOBO temperature data from CSLSdata::water_chem for surface and bottom temperatures, and summarizes at a daily or monthly time step for the desired time period.

1	process_lake_temp(start_date, end_date, dt = "day")

`start_date`	start date of analysis period (POSIX).
`end_date`	end date of analysis period (POSIX).
`dt`	time step at which to summarize data. Defaults to "day" for daily time step, can also be "month" for monthly time step.

If using with non-CSLS data, will need an alternate way to get weather data (including lake evaporation) into the format outputted by this function.

df, a data frame with the following columns:

`lake`	name of lake, i.e., "Pleasant", "Long", and "Plainfield"
`date`	date of observation (POSIX). If monthly time step, monthly summary is assigned to first day of the month
`ltmp_bot_C`	lake temperature at bottom of lake, deg C. Used for some solute reaction rates.
`ltmp_surf_C`	lake temperature at surface of lake, deg C. Used for stable isotope in evaporation calculations