Costas:
If you
have the resources, a small amount of experimentation would be useful,
interesting and perhaps publishable. It certainly could be a
good way to do "parallel" computing and getting overall
faster turnaround. Ray and I have had discussions with various
people over the years about spin-up and possibly tacking together long
sequences of simulations, as you propose, but I'm not sure anyone has
looked thoroughly at the problem for the time scales you are
interested in. It would be interesting to repeat analyses
similar to those in that Pan et al. paper, but with longer overlap and
simulation periods and including soil moisture and temperature.
On the
issue of spin-up, John Roads has advocated a 2-year spin-up for the
Inter-CSE Transferability Experiments (e.g.,
http://rcmlab.agron.iastate.edu/twg/ and links therein).
Jens and/or Ole Christensen once published some work on RCM spin-up
that proposed even longer periods, but I believe the longer periods
were primarily for slowly evolving and weakly interacting lowest
layers of their multi-layer soil model.
These
references may also be of interest:
Title: One-way nested
regional climate simulations and domain size
Author(s): Vannitsem
S, Chome F
Source: JOURNAL OF
CLIMATE 18 (1): 229-233 JAN 1 2005
Title: Reinitialized
versus continuous simulations for regional climate
downscaling
Author(s): Qian JH,
Seth A, Zebiak S
Source: MONTHLY
WEATHER REVIEW 131 (11): 2857-2874 NOV 2003
And possibly these, too, on the issue of
re-initialization:
Title: Multi-year
simulations and experimental seasonal predictions for rainy seasons in
China by using a nested regional climate model (RegCM_NCC). part I:
Sensitivity study
Author(s): Ding YH,
Shi XL, Liu YM, Liu Y, Li QQ, Qian FF, Miao QQ, Zhai QQ, Gao
K
Source: ADVANCES IN
ATMOSPHERIC SCIENCES 23 (3): 323-341 MAY 2006
Title: Polar MM5
simulations of the winter climate of the Laurentide Ice Sheet at the
LGM
Author(s): Bromwich
DH, Toracinta ER, Wei HL, Oglesby RJ, Fastook JL, Hughes
TJ
Source: JOURNAL OF
CLIMATE 17 (17): 3415-3433 SEP 2004
Title: Aspects of the
fine-scale climatology over Lake Tanganyika as resolved by a mesoscale
model
Author(s): Savijarvi
H, Jarvenoja S
Source: METEOROLOGY
AND ATMOSPHERIC PHYSICS 73 (1-2): 77-88 2000
Cheers,
Bill
At 11:28 AM -0500 7/20/06, Raymond Arritt wrote:
Hello Costas,
Some members of our group published a paper on this topic a few years
ago. The paper is for North America instead of the Mediterranean
so there will be some differences in soil moisture response;
nevertheless, the results may be of interest for you. The
citation is:
Pan, Z., E. Takle, W. Gutowski, and R. Turner, 1999: Long simulation
of
regional climate as a sequence of short segments. Mon. Wea.
Rev., 127,
308-321.
Regards,
Ray Arritt
Costas Douvis wrote:
Dear colleagues
I intend to run a 40-year simulation over the Mediterranean with
ERA-40 boundaries. I am facing the dilemma of doing one simulation
for the whole 40-year period or doing 3 x 15-year simulations at
three PCs thus splitting the 40-year period into three sub-periods
with an overlapping of 1-2 years from one sub-period to the other.
This will save me time but I am not sure if there will be any
problems with the continuity of the simulation by splitting one
long
simulation into 3 shorter ones. I assume that for the atmospheric
part of the model a spin-up time of one month would be fine and so
an
overlapping of one year from one sub-period to the other could be
safe enough but how about the other parts of the model like the
land
surface? I would be grateful if you could give me your opinion.
Best regards Costas Douvis
_______________________________________________
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/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~