If not, is there a method for converting solar radiation to “cloud cover” or “actual sunshine duration on a cloudy day” so “percent sunshine for time period” can be calculated using formula II(22)?
Formula II(22): Percent possible sunshine = S/So = 1-(cloud cover)5/3 S = actual sunshine duration on a cloudy day (hours) So = sunrise to sunset duration at the specified site (hours), which can be found in output Table VI A236. Basically, you are on the right track. Use midnight to midnight for the sky cover and convert using the formula you cited. You can try including observed solar radiation to see if it improves the model, but I doubt that it will on a day-to-day basis. However, it MAY reduce your overall model bias. If so, this will be a good justification for tinkering with the Global solar calibration coefficient. Ultimately, as you suggest, I doubt that using one year of solar data that is applied to 20 years would be a good idea. Is there a method for directly converting solar radiation into percent sun? No. One thing I have considered, but have not had the time for, is a reverse calibration method that would, in essence, run SSTEMP to figure out (more or less by trial and e
Related Questions
- If not, is there a method for converting solar radiation to "cloud cover" or "actual sunshine duration on a cloudy day" so "percent sunshine for time period" can be calculated using formula II(22)?
- Why is reported solar radiation sometimes greater on a partly cloudy day than on a clear day?
- Why is reported solar radiation sometimes greater on a partly cloudy day than on a clear day?
- What is the name of the instrument used to measure overall or indirect solar radiation?
- What is the name of the instrument used to measure overall or indirect solar radiation?
- Doesn a Solar Thermal system need bright sunshine to work?
