News #news

Posted 12/17/2009
Thanks to Mr. Hidetaka Sasaki, who implemented Japan Meteorological Agency's (JMA) Operational Non-Hydrostatic Model (NHM, Saito et al., MWR 2006) into our g-rsm system. NHM has been used operationally at JMA for the last several years and is also used extensively for downscaling of climate simulations. Some of the studies that utilized the NHM are listed here . The NHM in our system has been tested for 3 cases over California and are found to be very reasonable. The NHM allows downscaling of RSM, which can be run at 10km, to even finer resolution, as fine as a few tenths of a km. Due to the formal contract with JMA, we need to obtain permission to provide use of this model to outsiders. If you are interested, please contact kana@ucsd.edu. The model can be launched by selecting the model as nhm when install script is run, but currently access to the model is prohibited without prior permission.

With this implementation, our system has 4 components, GSM, RSM, ROMS and NHM. The coupling of RSM and ROMS is technically complete, and we are in the process of examining the results very carefully. The coupling of GSM and ROMS is now in progress.

Posted 11/10/2009
We have just introduced changes to the lateral boundary treatment, which seems to give better simulation near the lateral boundaries. The boundary nudging coefficients are now computed using Lehmann's work, and the nudging of tendencies is removed (there were nudging of perturbations and tendencies in the original). The lateral boundary zone was fixed to 8 grid points, regardless of the domain size and x and y dimensions. For cosmetic purposes, precipitation is set to zero in the lateral boundary zone and smoothing is applied to make the field more continuous in space, although this does not affect simulation. If you want to go back to the original settings, please edit misc.h and undefine ZERBZDIA, ZMTHBZ and LEHMANN.

Posted on Oct. 1, 2009 at 5:30pm PST.
We decided to commit the roms version to the trunk of the cvs. What this means is that you do not need to type "cvs co -r kana_roms_branch_20090504 INSTALL" to get the latest version with roms. You simply need to type "cvs co INSTALL". THIS ALSO MEANS THAT "cvs co Install" to get the older version no longer works. You need to type "cvs co -r preroms Install" instead (you can also type cvs co -D20090930 Install). IT IS ALSO IMPORTANT THAT simple ./install does not work any longer for the preroms version. You need to type "./install --version=preproms". It is very easy to make a mistake by not providing --version, and I will try to change the old install script to display a warning, but this may take a little bit of time. I will also change the inst script accordingly.
!!! For regular users, the newest roms version should work fine and should produce results just like the older version. Simply type:
"cvs co INSTALL" and then type
"./install" and follow instructions.