Hi all,
could someone who knows answer him, please?
/Stefan
Forwarded message:
From: Thomas,Renish <renish.tho...@colostate.edu>
To: Richard Larsson <ric.lars...@gmail.com>
Cc: Stefan Buehler <stefan.bueh...@uni-hamburg.de>,
arts_users...@lists.uni-hamburg.de
<arts_users...@mailman.rrz.uni-hamburg.de>
Subject: Re: [arts-users] Calculated brightness temperature bias
causes.
Date: Wed, 21 Apr 2021 21:16:37 +0000
Thank you, Richard and Stefan,
Yes, that is the difference that I am getting at 183 GHz.
Does the scattering calculation methods in ARTS even now accept only
RJBT units ? Are Planck units going to be enabled for scattering
solvers anytime soon?
Thanks,
Renish
________________________________
From: Richard Larsson <ric.lars...@gmail.com>
Sent: Tuesday, April 20, 2021 5:42 AM
To: Thomas,Renish <renish.tho...@colostate.edu>
Cc: Stefan Buehler <stefan.bueh...@uni-hamburg.de>;
arts_users...@lists.uni-hamburg.de
<arts_users...@mailman.rrz.uni-hamburg.de>
Subject: Re: [arts-users] Calculated brightness temperature bias
causes.
Hi,
Just by numbers:
RJBT at 300 K 183 GHz is 3.086705214957283e-15
Planck at 300 K 183 GHz is 3.0417434132511342e-15
This means you expect a 1.5 % difference, or about 4.5 K between them.
With hope,
//Richard
Den tis 20 apr. 2021 kl 13:22 skrev Thomas,Renish
<renish.tho...@colostate.edu<mailto:renish.tho...@colostate.edu>>:
Hi Stephan,
I am using Rayleigh jeans. As I need to activate cloud box in some
instances.
I understand that RJBT instead of Planck can cause a dip in the
brightness temperatures. Is this the only factor that can cause a
bias, or does pressure levels, lat/lon grid resolution also cause a
bias?
Thanks,
Renish
-------- Original message --------
From: Stefan Buehler
<stefan.bueh...@uni-hamburg.de<mailto:stefan.bueh...@uni-hamburg.de>>
Date: 4/20/21 6:11 AM (GMT-06:00)
To: "Thomas,Renish"
<renish.tho...@colostate.edu<mailto:renish.tho...@colostate.edu>>
Cc:
"arts_users...@lists.uni-hamburg.de<mailto:arts_users...@lists.uni-hamburg.de>"
<arts_users...@mailman.rrz.uni-hamburg.de<mailto:arts_users...@mailman.rrz.uni-hamburg.de>>
Subject: Re: [arts-users] Calculated brightness temperature bias
causes.
Dear Renish,
do you use Planck or Rayleigh-Jeans brightness temperature? For
Planck,
you should indeed approach the ambient temperature if you go low
enough.
Cheers
Stefan
On 20 Apr 2021, at 12:46, Thomas,Renish wrote:
Hi Everyone,
I had some questions about the calculated brightness temperature in
ARTS.
When I calculate the brightness temperature for an atmospheric
scenario in "horizon looking mode" and in clearsky. I get a
brightness
temperature at 183.31 GHz (Water vapor absorption line), which is
about 3 to 6 degrees lower than the ambient temperature.
I would assume that at the water vapor absorption line and at low
altitudes (~2 km above sea level), I should measure very close to the
ambient temperature (Due to high absorption).
So, my questions are:
1.) Is this brightness temperature bias expected?, or can something
else cause this?
Thanks,
Renish
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