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Welcome to the WRF-Chem mozbc discussion group.

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Jul 4

Looking for revised mozbc code for WRF hybrid coordinate / WRF-Chem v4.5.1

Dear all, I am preparing chemical initial and boundary conditions for WRF-Chem v4.5.1 simulations of

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Looking for revised mozbc code for WRF hybrid coordinate / WRF-Chem v4.5.1

Dear all, I am preparing chemical initial and boundary conditions for WRF-Chem v4.5.1 simulations of

Jul 4

Paul Goddard, … anasibnu basheer3

Jun 23

issue with AOD output using chem opt 202 and mozbc

Hi.. Have you resolved the issue? I am facing the same problem of low AOD. I really appreciate any

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issue with AOD output using chem opt 202 and mozbc

Hi.. Have you resolved the issue? I am facing the same problem of low AOD. I really appreciate any

Jun 23

Naser Mohammadzadeh, Héctor Jorquera González2

May 25

Update mozbc mapping for mozart-mosaic 4bin

Hi Naser Try this mapping, it worked for my run of mech 201: %%%%%%%%%%%%%%%%%%%%%%%%%%%%% beginning

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Update mozbc mapping for mozart-mosaic 4bin

Hi Naser Try this mapping, it worked for my run of mech 201: %%%%%%%%%%%%%%%%%%%%%%%%%%%%% beginning

May 25

Alice Burton, … vaishnavi vaishnavi4

May 25

mozbc creates negative values

Hey everybody, Anyone figure out this issue? On Monday, November 3, 2025 at 6:13:40 PM UTC+5:30

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mozbc creates negative values

Hey everybody, Anyone figure out this issue? On Monday, November 3, 2025 at 6:13:40 PM UTC+5:30

May 25

Naser Mohammadzadeh

Apr 24

MOZBC Daily Update Causing Spikes at 00 UTC

Hello, I am running MOZBC daily, updating the boundary conditions at 00 UTC each day. However, my

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MOZBC Daily Update Causing Spikes at 00 UTC

Hello, I am running MOZBC daily, updating the boundary conditions at 00 UTC each day. However, my

Apr 24

Naser Mohammadzadeh

Apr 17

Question about MOZBC time handling

Hello everyone, I have a question regarding my understanding of MOZBC. Suppose I want to run a model

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Question about MOZBC time handling

Hello everyone, I have a question regarding my understanding of MOZBC. Suppose I want to run a model

Apr 17

Mauro Morichetti

Jan 27

Second Call for Abstracts – European WRF-Chem Workshop 2026

!!!! Second Call for Abstracts – European WRF-Chem Workshop 2026 !!!! The European WRF-Chem Workshop

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Second Call for Abstracts – European WRF-Chem Workshop 2026

!!!! Second Call for Abstracts – European WRF-Chem Workshop 2026 !!!! The European WRF-Chem Workshop

Jan 27

Gwang-Jin Lee, … Naser Mohammadzadeh6

Jan 16

RACMSORG.inp for CAM-Chem

Dear Hecor Hi Do you have mapping for RACM-MADE-VBS (chem_opt=108)? Best, Thank you On Saturday,

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RACMSORG.inp for CAM-Chem

Dear Hecor Hi Do you have mapping for RACM-MADE-VBS (chem_opt=108)? Best, Thank you On Saturday,

Jan 16

Naser Mohammadzadeh

Jan 16

MOZBC Species Mapping for RACM–MADE–VBS in WRF-Chem

Hello, I am running WRF-Chem with the RACM–MADE–VBS chemical mechanism and would like to apply MOZBC

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MOZBC Species Mapping for RACM–MADE–VBS in WRF-Chem

Hello, I am running WRF-Chem with the RACM–MADE–VBS chemical mechanism and would like to apply MOZBC

Jan 16

Ailish Graham, … 아베다 / 연구원 / 기초과학연구원11

12/1/25

Fail to process netCDF file.... in mozbc

Hello. I am following the same process to include CAMS data to WRF-Chem. I am stuck at the following

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Fail to process netCDF file.... in mozbc

Hello. I am following the same process to include CAMS data to WRF-Chem. I am stuck at the following

12/1/25

Nishant, … Mauro Cortez Huerta9

11/5/25

WACCM Download Error

Downloads have been enabled again, I have been able to download a couple of files from the portal (

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WACCM Download Error

Downloads have been enabled again, I have been able to download a couple of files from the portal (

11/5/25

11/3/25

Negetive Values in wrfbdy file

Hi all I am running WRF-Chem v4.5 and attempted to generate initial and boundary conditions wrfinput

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Negetive Values in wrfbdy file

Hi all I am running WRF-Chem v4.5 and attempted to generate initial and boundary conditions wrfinput

11/3/25

Mauro Morichetti

10/21/25

European WRF-Chem Workshop 2026

Hi all, !!!! First call of the European WRF-Chem Workshop 2026 !!!! The workshop will be held in

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European WRF-Chem Workshop 2026

Hi all, !!!! First call of the European WRF-Chem Workshop 2026 !!!! The workshop will be held in

10/21/25

Muhammad Burhan Khalid

9/29/25

Guidance on CO2 IC/BC using MOZBC

Hi All My name is Muhammad Burhan, and I am working on CO2 simulations using the WRF-Chem model. I am

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Guidance on CO2 IC/BC using MOZBC

Hi All My name is Muhammad Burhan, and I am working on CO2 simulations using the WRF-Chem model. I am

9/29/25

Zhiqi Yang, Xiao-Ming Hu2

9/25/25

Using mozbc to map WACCM to WRF-chem and get negative values of chemical boundary conditions

I now have the same issue: when I set have_bcs_chem=.true. in namelist.input, the model will be stuck

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Using mozbc to map WACCM to WRF-chem and get negative values of chemical boundary conditions

I now have the same issue: when I set have_bcs_chem=.true. in namelist.input, the model will be stuck

9/25/25

Mariya Benny, Carl Drews2

7/23/25

WACCM DATASETS DOWNLOAD ISSUE

Hello Mariya - The NSF NCAR supercomputers came back online last night at 7:21 PM Mountain after

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WACCM DATASETS DOWNLOAD ISSUE

Hello Mariya - The NSF NCAR supercomputers came back online last night at 7:21 PM Mountain after

7/23/25

Muhammad Burhan Khalid

5/10/25

Running mozbc for one month

Hi All I want to run Wrf-Chem for one month for this one i have nc file with one month dataset (

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Running mozbc for one month

Hi All I want to run Wrf-Chem for one month for this one i have nc file with one month dataset (

5/10/25

4/24/25

trying to provide emission files WRF-Chem in two different months, but continuously (Feb to Jan)

Dear WRF-chem users, Hi, I hope you are doing well. My name is Samira. I am trying to run WRF-Chem in

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trying to provide emission files WRF-Chem in two different months, but continuously (Feb to Jan)

Dear WRF-chem users, Hi, I hope you are doing well. My name is Samira. I am trying to run WRF-Chem in

4/24/25

Muhammad Burhan Khalid, … Mary Barth7

3/6/25

Issue with mozbc while running with waccm file

Hi Muhammad, This question would be better to post to the WRF user's forum. Remember this email

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Issue with mozbc while running with waccm file

Hi Muhammad, This question would be better to post to the WRF user's forum. Remember this email

3/6/25

Muhammad Burhan Khalid

3/5/25

unable to found CO2_BCK parameter

Hi everyone I am working with co2 green house gases. I successfully ran mozbc tool for creating

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unable to found CO2_BCK parameter

Hi everyone I am working with co2 green house gases. I successfully ran mozbc tool for creating

3/5/25

Shreta Ghimire, … Paresh7

2/27/25

chk_moz_vars: could not find O3_VMR_inst

Hello Mary, Editing mozbc.inp file worked. Thank you On Sunday, 23 February 2025 at 01:25:03 UTC+5:30

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chk_moz_vars: could not find O3_VMR_inst

Hello Mary, Editing mozbc.inp file worked. Thank you On Sunday, 23 February 2025 at 01:25:03 UTC+5:30

2/27/25

1/31/25

Issue with WRF-Chem Forecast - mozbc Time Increment Erro

I am running WRF-Chem v4.5 to forecast PM2.5 using chem_opt = 106 in namelist.input. For boundary and

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Issue with WRF-Chem Forecast - mozbc Time Increment Erro

I am running WRF-Chem v4.5 to forecast PM2.5 using chem_opt = 106 in namelist.input. For boundary and

1/31/25

12/14/24

Hello all. I successfully ran real.exe and then also generated the chemical input file needed to run

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Hello all. I successfully ran real.exe and then also generated the chemical input file needed to run

12/14/24

chen, … Carl Drews4

11/21/24

MOZART-4 data download

Yi'ang - Just now I was able to download GEOS5 MOZART data from the subset form: https://www.acom

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MOZART-4 data download

Yi'ang - Just now I was able to download GEOS5 MOZART data from the subset form: https://www.acom

11/21/24

chen, Carl Drews2

10/1/24

CAM-Chem data download problem

Hello Chen - The limit of 30 open requests applies to ACOM, not to the individual e-mail accounts.

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CAM-Chem data download problem

Hello Chen - The limit of 30 open requests applies to ACOM, not to the individual e-mail accounts.

10/1/24

9/29/24

Re: Data download

Hello, I would like to remind you that there is a Google email group for wrf-chem-mozbc questions. I

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Re: Data download

Hello, I would like to remind you that there is a Google email group for wrf-chem-mozbc questions. I

9/29/24

9/29/24

Re: Bug in mozbc Execution

Hello Da, First, I would like to remind you that there is a Google email group for wrf-chem-mozbc

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Re: Bug in mozbc Execution

Hello Da, First, I would like to remind you that there is a Google email group for wrf-chem-mozbc

9/29/24

MinGyung, yujin2

8/28/24

mozbc, CarbonTracker

Hi I'm also trying to run mozbc using Carbon Tracker data. But I have the same problem as

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mozbc, CarbonTracker

Hi I'm also trying to run mozbc using Carbon Tracker data. But I have the same problem as

8/28/24

Naser Mohammadzadeh, Carl Drews2

8/20/24

Problem with Downloading CAM-CHEM Data

Naser - We have fixed some e-mail problems resulting from a recent system upgrade. Please issue your

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Problem with Downloading CAM-CHEM Data

Naser - We have fixed some e-mail problems resulting from a recent system upgrade. Please issue your

8/20/24

Thiago Ferreira Gomes

8/15/24

Hello everyone, I hope you're doing well! I'm reaching out to check if the link "https:/

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Hello everyone, I hope you're doing well! I'm reaching out to check if the link "https:/

8/15/24

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