Page 1 of 1

cloud cover vs cloud fraction

PostPosted: Wed Feb 27, 2013 5:54 pm
by jperdigao
Hi

Need some help! I'm working with cldfra (cloud fraction) but now i have a doubt... :(

Cloud fraction is equivalent to cloud cover for the WRF- ARW? :(

How can i find the definition of cldfra??

Some help. please

Re: cloud cover vs cloud fraction

PostPosted: Mon Jan 06, 2014 7:40 pm
by jperdigao
someone knows how model calculate the TCDC (Total cloud cover %) ? Thanks.

Re: cloud cover vs cloud fraction

PostPosted: Mon May 18, 2015 11:58 am
by MfE
Hi jperdigao,

the model uses Xu-Randall method, in this link you can see the formula:
http://www.emc.ncep.noaa.gov/GFS/doc.php#clofrac

the problem is that I don't know how to calculate ql, the liquid water mixing ratio.
Do you have any idea?

Re: cloud cover vs cloud fraction

PostPosted: Thu Jun 04, 2015 11:54 am
by Mauricio_S
MfE wrote:Hi jperdigao,

the model uses Xu-Randall method, in this link you can see the formula:
http://www.emc.ncep.noaa.gov/GFS/doc.php#clofrac

the problem is that I don't know how to calculate ql, the liquid water mixing ratio.
Do you have any idea?


hi!
with that formula can i calculate cloud cover? or something similar (i need cloud cover/could fraction measured in OKTS, http://en.wikipedia.org/wiki/Okta)
thanks :)!

Re: cloud cover vs cloud fraction

PostPosted: Tue Oct 09, 2018 7:41 pm
by lanlandeercy
For model results we define the model cloud-base height as the height above which cloud liquid water content exceeds 0.025 g/cm^3; define the model cloud-top height as the height below which cloud liquid water content exceeds 0.025 g/cm^3.