Difference in DSWRF (surface) and only DSWRF. And is there any way to find direct and diffuse component from NLDAS
Posted: Wed Jul 01, 2020 4:42 pm America/New_York
Dear User Forum,
This might sound a rudimentary query for you all. But here is the problem I am facing. For some urban heat island study, it is important to get the direct and diffuse component from the Downward Shortwave Radiation. Here are the three model I have found in NLDAS that provides the related data.
1. NLDAS Noah Land Surface Model L4 Hourly 0.125 x 0.125 degree V002
This data provides DSWRF. Although for this (i.e. DSWRF = Downward shortwave radiation flux (W/m^2)) it does not mentioned if its on the surface or at TOA
It also has the NSWRS which clearly mentioned that it is on surface (i.e. NSWRS = Net shortwave radiation flux (surface) (W/m^2))
2. NLDAS VIC Land Surface Model L4 Hourly 0.125 x 0.125 degree V002
DSWRF = Shortwave radiation flux downwards (surface) (W/m^2)
NSWRS = Shortwave radiation flux net (surface) (W/m^2)
Please notice that for this model it clearly mentioned that DSWRF is on the surface
3. NLDAS Mosaic Land Surface Model L4 Hourly 0.125 x 0.125 degree V002
DSWRF = Downward shortwave radiation flux (W/m^2)
NSWRS = Net shortwave radiation flux (surface) (W/m^2)
Please notice that in this model it mentioned NSWRS as on the surface but not for the DSWRF.
So my question would be is it something with the naming convention?? Even though 'surface' is not mentioned for some of the products, does that mean we would assume they all at surface measurements?
Finally any way to know the direct and diffuse component of downward shortwave radiation?
This might sound a rudimentary query for you all. But here is the problem I am facing. For some urban heat island study, it is important to get the direct and diffuse component from the Downward Shortwave Radiation. Here are the three model I have found in NLDAS that provides the related data.
1. NLDAS Noah Land Surface Model L4 Hourly 0.125 x 0.125 degree V002
This data provides DSWRF. Although for this (i.e. DSWRF = Downward shortwave radiation flux (W/m^2)) it does not mentioned if its on the surface or at TOA
It also has the NSWRS which clearly mentioned that it is on surface (i.e. NSWRS = Net shortwave radiation flux (surface) (W/m^2))
2. NLDAS VIC Land Surface Model L4 Hourly 0.125 x 0.125 degree V002
DSWRF = Shortwave radiation flux downwards (surface) (W/m^2)
NSWRS = Shortwave radiation flux net (surface) (W/m^2)
Please notice that for this model it clearly mentioned that DSWRF is on the surface
3. NLDAS Mosaic Land Surface Model L4 Hourly 0.125 x 0.125 degree V002
DSWRF = Downward shortwave radiation flux (W/m^2)
NSWRS = Net shortwave radiation flux (surface) (W/m^2)
Please notice that in this model it mentioned NSWRS as on the surface but not for the DSWRF.
So my question would be is it something with the naming convention?? Even though 'surface' is not mentioned for some of the products, does that mean we would assume they all at surface measurements?
Finally any way to know the direct and diffuse component of downward shortwave radiation?