Search found 27 matches

by zhang
Sat Oct 21, 2023 2:15 am
Forum: Ocean News
Topic: John S. Allen (1937-2023)
Replies: 5
Views: 27366

Re: John S. Allen (1937-2023)

Message from OSU: CEOAS and POA will be holding an event in recognition of Professor John Allen next week on Monday, October 23 starting at 3:00 pm (PT). Speakers will include Tuba Özkan-Haller, Doug Caldwell, Ken Brink, and Dudley Chelton. This event will be held in person in Burt 193 and also ...
by zhang
Thu Oct 12, 2023 10:09 am
Forum: Ocean News
Topic: John S. Allen (1937-2023)
Replies: 5
Views: 27366

Re: John S. Allen (1937-2023)

I am so sorry to hear about this. Thanks for sharing, John, W. We have lost a giant of the community. I didn't get to interact too much with John Allen. But I have read a lot of his papers, which have helped me a lot, particularly, on the topic of coastal-trapped waves. I vividly remember all the ...
by zhang
Mon Jul 31, 2023 7:51 pm
Forum: Job Opportunities
Topic: WHOI Technical Staff position for ROMS modeler
Replies: 0
Views: 12114

WHOI Technical Staff position for ROMS modeler

Woods Hole Oceanographic Institution is currently searching for a Research Associate with extensive ROMS experience to join the Applied Ocean Physics & Engineering Department. This is a regular, full-time, non-exempt position, and is eligible for full benefits. The initial appointment is for 12 ...
by zhang
Mon Mar 20, 2023 12:23 am
Forum: Ocean News
Topic: Dale B. Haidvogel (1949-2023)
Replies: 18
Views: 63430

Re: Dale B. Haidvogel (1949-2023)

I am saddened by the news. Dale Haidvogel was the person who brought me to the U.S. and into the oceanography community, and let me pursue my own interest. For that, I am forever grateful! I was in Fluid Mechanics when I was working on a master's degree at Zhejiang Univ in China 20 years ago. By ...
by zhang
Tue Feb 21, 2023 9:21 pm
Forum: Meetings/Workshops
Topic: Update: GRC - Coastal Ocean Dynamics in June 2023
Replies: 0
Views: 9073

Update: GRC - Coastal Ocean Dynamics in June 2023

As chairs and vice chairs of the Gordon Research Research Conference (GRC) on Coastal Ocean Dynamics we would like to invite you to participate in the 2023 Coastal Ocean Dynamics GRC to be held 18-23 June 2023 at Bryant University in Rhode Island. The entire conference program is now available at ...
by zhang
Wed Jan 11, 2023 11:30 am
Forum: Meetings/Workshops
Topic: GRC - Coastal Ocean Dynamics in June 2023
Replies: 0
Views: 10097

GRC - Coastal Ocean Dynamics in June 2023

Hi, all, The Gordon Research Conference (GRC) - Coastal Ocean Dynamics is coming back after 4 years, and we would like to invite you to attend. It will take place at Bryant University in Rhode Island on June 18-23, 2023: https://www.grc.org/coastal-ocean-dynamics-conference/2023/ There will also be ...
by zhang
Sat Jul 09, 2022 1:11 pm
Forum: ROMS Information
Topic: LIMIT_VVISC
Replies: 5
Views: 16670

Re: LIMIT_VVISC

It is really strange to see Robinson and Dong's claim that the ROMS GLS code has issues for simulating internal tides. I have been using GLS for simulations of internal tides at a shelf edge for years. I have no problem with the code. The modeled viscosity and diffusivity look fine to me, and the ...
by zhang
Thu Jun 23, 2022 1:20 pm
Forum: ROMS Discussion
Topic: Running ocean models on GPU
Replies: 1
Views: 2509

Running ocean models on GPU

Hi, all,
I just came across this new paper about running a Python-based ocean model on GPUs achieving better performance than traditional CPU-based parallel simulations:
https://agupubs.onlinelibrary.wiley.com ... 21MS002717

Any thought on this?

Gordon
by zhang
Tue Jan 18, 2022 2:05 am
Forum: Job Opportunities
Topic: Research Associate position(s) at Woods Hole Oceanographic Institution
Replies: 0
Views: 4495

Research Associate position(s) at Woods Hole Oceanographic Institution

Hi, all, We are currently looking for a (and maybe more) Research Associate with a background in ocean modeling to join the Woods Hole Oceanographic Institution. This is a regular, full-time, non-exempt position, and is eligible for full benefits. The initial appointment is for 18 months with the ...
by zhang
Thu Oct 14, 2021 3:56 pm
Forum: ROMS Problems
Topic: OUTPUT - multi-file counter AVG(ng)%load = 3, is greater than Nfiles = 2 dimension 247058 in structure when c
Replies: 4
Views: 11043

Re: OUTPUT - multi-file counter AVG(ng)%load = 3, is greater than Nfiles = 2 dimension 247058 in structure when c

Thanks, Hernan. I am restarting a simulation from a perfect restart file and asking the model to output multiple history and average files. The problem occurs when the model tries to create a new average file during the middle of the simulation. But it has no problem with creating new history files ...
by zhang
Thu Oct 14, 2021 2:05 pm
Forum: ROMS Problems
Topic: OUTPUT - multi-file counter AVG(ng)%load = 3, is greater than Nfiles = 2 dimension 247058 in structure when c
Replies: 4
Views: 11043

Re: OUTPUT - multi-file counter AVG(ng)%load = 3, is greater than Nfiles = 2 dimension 247058 in structure when c

Hi, I am running into the same problem when I restart a simulation and ask the model to generate multiple average files. The problem occurs when it tries to create a new average file. The error message is: OUTPUT - multi-file counter AVG(ng)%load = 2, is greater than Nfiles = 1 dimension in ...
by zhang
Wed Nov 14, 2018 9:56 pm
Forum: Job Opportunities
Topic: Postdoctoral Investigator position at WHOI
Replies: 0
Views: 2703

Postdoctoral Investigator position at WHOI

Woods Hole Oceanographic Institution is currently searching for a Postdoctoral Investigator to join the Coastal Ocean Fluid Dynamics Laboratory in the Applied Ocean Physics & Engineering Department. This is a temporary, full-time, exempt position, and is eligible for benefits. JOB SUMMARY ...
by zhang
Thu Jan 22, 2015 6:23 pm
Forum: ROMS Bugs
Topic: a bug in mod_mixing
Replies: 0
Views: 3144

a bug in mod_mixing

Line 1148 in mod_mixing.F, the CPP flag FORWARD_MIXING is misspelled as FOWARD_MIXING.

Gordon
by zhang
Wed Jan 30, 2013 3:28 am
Forum: ROMS Discussion
Topic: How to calculate the residence time
Replies: 5
Views: 11756

Re: How to calculate the residence time

Hey, If you want your calculation of the residence time to be mathematically precise and also resolve its temporal and spatial variability, you should definitely look into the Constituent-oriented Age and Residence time Theory (CART; http://www.elic.ucl.ac.be/repomodx/cart/ ). The forward model ...
by zhang
Thu Feb 26, 2009 2:28 am
Forum: ROMS Adjoint
Topic: which option can I use for vertical mixing in adjoint model?
Replies: 6
Views: 8201

Re: which option can I use for vertical mixing in adjoint model?

We don't need FORWARD_BULKFLUX. Yes, the linearization of bulk flux is problematic. The way to get around that is to save the surface tracer and momentum fluxes in the forward nonlinear simulation (remember to save the shortwaver radiation separately). The ROMS adjoint and tangent linear models will ...
by zhang
Thu Aug 28, 2008 3:44 am
Forum: ROMS Ecosystem
Topic: Initialization for Fasham and EcoSim BioToys applications
Replies: 15
Views: 22897

Re: Initialization for Fasham and EcoSim BioToys applications

Is Bac_F1 part of the initial condition? If it is, you must have bad data in your initial condition since model encounter that problem while writing the initial record.
by zhang
Sun Jun 01, 2008 1:29 am
Forum: ROMS Source
Topic: Point sources of passive tracer
Replies: 3
Views: 11823

I've never used 2.2. But for the latest version of ROMS we can get using svn, there are more than one place we need to change to add point source for a passive tracer. Some changes in Nonlinear/get_idata.F is required to turn on SOURCES(ng)%Lsrc and SOURCES(ng)%Ltracer for the added passive tracer ...
by zhang
Tue Feb 05, 2008 1:16 am
Forum: ROMS Source
Topic: Passive tracers
Replies: 2
Views: 13081

You need to add passive tracer concentration variable in your initial condition file. This variable should have the same dimension as temperature (temp) and salinity (salt). The name of the variable should be consistent with that in varinfo.dat (the default one is 'dye_'). If you stick with the ...
by zhang
Thu Jan 31, 2008 3:17 pm
Forum: ROMS Problems
Topic: array scalars%sc_w is out of range?
Replies: 8
Views: 6174

which version of pgi are you using?
by zhang
Thu Sep 20, 2007 1:29 pm
Forum: ROMS Bugs
Topic: svnversion of "make"
Replies: 6
Views: 9177

Hey, Zhou Feng,

Check your permission under the directory you are compiling. Maybe you don't have the permission to create the scratch directory (./Build/). But I am not sure.
by zhang
Wed Sep 19, 2007 3:04 am
Forum: ROMS Bugs
Topic: svnversion of "make"
Replies: 6
Views: 9177

You need to install svn on the machine you are compiling on. Type 'which svnversion' to see whether you have it installed. Check the 'makefile' file, there is a line like: SVNREV ?= $(shell svnversion -n .) This tells the system which version of the code you are working on, and the version number ...
by zhang
Fri Sep 07, 2007 12:11 pm
Forum: ROMS Problems
Topic: ROMS2.3 background running problem under PGI + MPI
Replies: 4
Views: 5541

FengZhou wrote:

Hi, Weifeng,
Thank you for the suggestions. I will bother you if necessary:)
Do I know you? I have a friend has the close name with you from Zhejiang University. He is in U.S.A now:)
Yes, it is me.
by zhang
Fri Sep 07, 2007 2:32 am
Forum: ROMS Problems
Topic: ROMS2.3 background running problem under PGI + MPI
Replies: 4
Views: 5541

Hey, Zhoufeng, You should really consider to update the code. There has been a lot of changes both in model and in compilers since then. Personally, I don't have any experience with roms2.3, but I wouldn't be surprised by some problem between very old version of roms and new version of compilers ...
by zhang
Tue Jul 17, 2007 9:00 pm
Forum: ROMS Installation
Topic: different result obtained with different versions of pgi
Replies: 5
Views: 7171

I tried the IEEE arithmetic standard ('-Kieee' option for pgi), the model results with different versions of pgi (pgi6.1, pgi7.0) became identical exactly as Rich said. But the results from different compilers (pgi, ifort and g95) are still different by same amount as before even all of them are ...
by zhang
Tue Jul 17, 2007 8:28 pm
Forum: ROMS Installation
Topic: different result obtained with different versions of pgi
Replies: 5
Views: 7171

hey, Natalie, The pgi6.1 I have gives the right answer as pgi7.0. I also tried pgi6.0 which does give wrong boundary indices as you said. So, the bug has been corrected in my pgi6.1. For the problem I was talking at the beginning of this thread, I was using pgi6.1 and pgi7.0. So, that is not the ...
by zhang
Tue Jul 17, 2007 3:06 am
Forum: ROMS Installation
Topic: svn checkout
Replies: 7
Views: 10792

try "Zhou\ Wei"?
by zhang
Tue Jul 03, 2007 6:07 pm
Forum: ROMS Installation
Topic: different result obtained with different versions of pgi
Replies: 5
Views: 7171

different result obtained with different versions of pgi

We recently updated our pgi compiler, and I am comparing the results from models compiled with different versions of pgi, 6.1 and 7.0. I ran the two nonlinear models for 120 time steps forced by exact same atmospheric forcings and initial conditions. For both of them, Flather and Chapman are used ...