Hi,
Having it done based on local time may be a bit tricky to code up.  As an alternative, we could consider storing the max/min temperature and wind for every output interval (e.g. 3 hours).  This way, the user can decide the reset time at the postproc stage... Of course, this increases the SRF output file size by about 15% as opposed to just a couple percent.
What do you think of this idea?
Jeremy

Tomáš Halenka wrote: 
Dear All,

Not bad hearing Tmax and Tmin will be included properly in new edition
of RegCM. But I would recommend to use WMO definition and reset time,
moreover, keep in mind it has to be done in local time as my opinion.

Best regards,

Tomas

*************************************************
RNDr. Tomas Halenka, CSc.
Charles University in Prague,
Faculty of Mathematics and Physics,
Department of Meteorology and Environment Protection,
V Holesovickach 2, 180 00  Prague 8,
Prague, Czech Republic,
Phone: +420 2 21912514
Fax:     +420 2 21912533
E-mail: tomas.halenka@mff.cuni.cz
*************************************************

-----Original Message-----
From: regcnet-bounces@lists.ictp.it
[mailto:regcnet-bounces@lists.ictp.it] On Behalf Of BI XUNQIANG
Sent: Wednesday, November 16, 2005 9:48 AM
To: Wm. J. Gutowski
Cc: Gao Xuejie; regcnet@lists.ictp.it
Subject: Re: [RegCNET] tmax and tmin


Dear Bill, Lara, and Gao:

In the next public released RegCM3 version, we will add Tmax, Tmin
and vertital velocity (for pressure level) as the standard output.

We will calculated Tmax and Tmin as the way Bill suggested (for
every land surface step, and reset at 00 UTC).

Any other fields are also necessary to be included ?

Thanks and best regards,

On Tue, 15 Nov 2005, Wm. J. Gutowski wrote:

  
Dear Lara:
	I am not the expert on this, but I am pretty sure that observed
    
Tmin 
  
and Tmax are obtained primarily from min/max thermometers, which
    
record the 
  
highest and lowest temperature attained since the last time they were
    
reset. 
  
They are almost always reset every 24 hours, though they don't all get
    
reset 
  
at the same time.  That is, different stations, even in the same
    
country (or 
  
in the US, the same state) may reset their thermometers at different
    
times of 
  
the day.  This can induce a small bias in one station's climatological
    

  
averages compared to what it would get if it reset at another time.
    
This is 
  
documented in the literature somewhere, though I don't have the
    
reference 
  
myself.
	Using the 3-hourly output will tend to reduce the diurnal
    
temperature 
  
range you get because that is probably not sampling the extremes of
    
the day, 
  
though I have not seen this reduction tabulated by anyone, and it
    
probably 
  
depends on location and season.  Including a computation of the true
    
daily 
  
min/max temperature would be just a few lines of code, and some of us 
RegCNETers have undoubtedly done it for their version of the code - we
    
really 
  
should have it as part of the standard model, I think.  There would
    
still be 
  
the question of what time of day to "reset the thermometer", but in
    
model 
  
intercomparisons I've been part of, we typically agree to go from 00
    
UTC - 00 
  
UTC.

Bill

At 11:32 AM -0800 05.11.14, Lara Kueppers wrote:
    
Hi-
Awhile back I asked how Tmin and Tmax in the SRF output file were 
calculated. Here is Nellie's recent reply, in case anyone else is 
interested.:

"Hi Lara,

I just verified this with Bi...Tmin and Tmax are calculated from the
      
BATS 
  
output, so if you have the model output to the SRF file every 3
      
hours, then 
  
that is what the min and max are calculated from.  Bi thinks this is
      
a 
  
better way to do it since min and max temp observations are generally
      
taken 
  
from 3 or 6 hourly obs.  You can increase the frequency of the srf
      
output 
  
variables (in the regcm.in file) to see how much of difference it
      
would 
  
make in the diurnal temp range. "

--
~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
Lara M. Kueppers, PhD
Postgraduate Researcher
Department of Earth Sciences
University of California, Santa Cruz
1156 High Street
Santa Cruz, CA  95064
USA

831.459.3504 ph
831.459.3074 fax
kueppers@pmc.ucsc.edu

_______________________________________________
RegCNET mailing list
RegCNET@lists.ictp.it
https://lists.ictp.it/mailman/listinfo/regcnet
      
-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
William J. Gutowski, Jr.
3021 Agronomy Hall
Dept. of Geological and
    Atmospheric Sciences
Iowa State University
Dept. of Agronomy
Ames, Iowa  50011-1010

gutowski@iastate.edu
Tel:1-515-294-5632
Fax:1-515-294-2619
http://www.ge-at.iastate.edu/
http://rcmlab.agron.iastate.edu/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

_______________________________________________
RegCNET mailing list
RegCNET@lists.ictp.it
https://lists.ictp.it/mailman/listinfo/regcnet

    

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~  Dr. Xunqiang Bi         email:bixq@ictp.it  ~ 
~  Physics of Weather and Climate Group        ~
~  The Abdus Salam ICTP                        ~
~  Strada Costiera, 11                         ~
~  P.O. BOX 586, 34100 Trieste, ITALY          ~
~  Tel: +39-040-2240302  Fax: +39-040-2240449  ~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
_______________________________________________
RegCNET mailing list
RegCNET@lists.ictp.it
https://lists.ictp.it/mailman/listinfo/regcnet


_______________________________________________
RegCNET mailing list
RegCNET@lists.ictp.it
https://lists.ictp.it/mailman/listinfo/regcnet
  

-- 
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera 11; 34100 Trieste, ITALY
Phone: +39 040 2240579; Fax: +39 040 2240449