Forcing Data-ERA5 products

[Somaye Imani]

Dear All,

I want to know which product in ERA5 reanalysis dataset we can use for long and shortwave radiation parameter as Forcing Data of wrfhydro?

and how can we use Idealized with precipitation (Ideal w/spec. precipitation) format as Forcing data? does anyone have experience in using this data format for running wrfhydro?

[Mirce]

Hi Somaye,

I am not sure if this will help, but I used the following product:

https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=overview

In this case, the only field missing is specific humidity (Q2D), so, you would need to calculate it separately and then attach it to the forcing files. 

You can find a way to create this field in  https://confluence.ecmwf.int/display/CKB/ERA5+data+documentation#ERA5datadocumentation-Computationofnear-surfacehumidityandsnowcover

I hope this is useful.

Best,

Mirce.

[Somaye Imani]

Dear Mirce,

I was very thankful for your prompt response. some of the parameters like "Surface net solar radiation", "Surface net thermal radiation", "Surface thermal radiation downward" and "Surface solar radiation downwards" exists in the "ERA5 hourly data  on single levels from  1979 to present" and all of them is known as shortwave or longwave radiation. 

Do you know which parameters are the best for shortwave and longwave (SWDOWN and  LWDOWN) radiation?  
 

[Somaye Imani]

Dear Mirce,

I was very thankful for your prompt response. some of the parameters like "Surface net solar radiation", "Surface net thermal radiation", "Surface thermal radiation downward" and "Surface solar radiation downwards" exists in the "ERA5 hourly data  on single levels from  1979 to present" and all of them is known as shortwave or longwave radiation. 

Do you know which parameters are the best for shortwave and longwave (SWDOWN and  LWDOWN) radiation?  
 

On Monday, December 30, 2019 at 12:02:21 AM UTC+3:30, Mirce wrote:

[Mirce]

Hi Somaye,

I am sorry for my late reply. I think these ones might be ok for SWDOWN and  LWDOWN : 

"Mean surface downward short-wave radiation flux"

"Mean surface downward long-wave radiation flux"

I hope this helps.

Best,

Mirce

[Somaye Imani]

Thanks for your help.

[Rwasoka D.T.]

Hie Somaye

I also find ECMWF radiation terminology a bit confusing at face value. 

You can refer to this pdf document for more information: Radiation Quantities in the ECMWF model and MARS (correct up to cycle 41R1) - - https://www.ecmwf.int/sites/default/files/elibrary/2015/18490-radiation-quantities-ecmwf-model-and-mars.pdf

And,

What are the definitions of the radiation fields?

Created by Helene Blanchonnet, last modified on Jul 20, 2018

"Surface solar radiation downwards" (SSRD) is the incident solar (shortwave) radiation and "surface solar radiation" (SSR) is the net solar radiation (the fraction of solar radiation not reflected by the surface). "Surface net solar radiation, clear sky" (SSRC) is a hypothetical field of net solar radiation assuming no clouds.

• "Surface thermal radiation downwards" (STRD) is the incident thermal (longwave) radiation and "surface thermal radiation" (STR) is the net thermal radiation. "Surface net thermal radiation, clear sky" (STRC) is a hypothetical field of net thermal radiation assuming no clouds.
• "Top solar radiation" is the net solar (shortwave) radiation at the top of the atmosphere (TOA). "Top net solar radiation, clear sky" is a hypothetical field assuming no clouds.
• "Top thermal radiation" is the net thermal (longwave) radiation at the top of the atmosphere. "Top net thermal radiation, clear sky" is a hypothetical field assuming no clouds.

https://confluence.ecmwf.int/pages/viewpage.action?pageId=111155332  

 

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