GEOS-Chem Nested Model

All users interested in the GEOS-Chem regional air quality simulations (e.g. nested-grid, GEOS-Chem/CMAQ linkages, etc.) are encouraged to subscribe to the regional air quality email list (click on the link in the contact information section below).

Contact information

Regional Air Quality Working Group Co-Chairs	Yuxuan Wang, Jun Wang and Lin Zhang
Regional Air Quality Working Group email list	geos-chem-regional@seas.harvard.edu
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Current Regional Working Group Projects (Please add yours!)

User Group	Description	Funding	Contact Person
Tsinghua	Nested-grid GEOS-Chem model development; Regional air quality over East Asia and interactions with the globe	N/A	Yuxuan Wang
SNU	Regional PM simulations over East Asia	Ministry of Environment in Korea	Rokjin Park
US EPA		N/A	Rob Pinder
U. Tennessee		N/A	Joshua Fu
Nat'l Obs. Athens		N/A	Anna Protonotariou
U. L'Aquila	Buondary conditions to CHIMERE model over Europe, focus on Saharan dust transport.	ASI (Italian Space Agency)	Gabriele Curci
Georgia Tech.		N/A	Tao Zeng
U. Toronto		N/A	Jane Liu
Peking University	Regional air quality in East Asia, Inversion of trace gas emissions using satellite products	N/A	May Fu
Dalhousie U.	Surface PM2.5 retrieval using satellite products	N/A	Aaron van Donkelaar
Dalhousie U.	Nested aerosol microphysics (TOMAS). NOx/ultrafine aerosol concentration relationships. Topographic influence on microphysics	N/A	Jeffrey Pierce
SUNY-Albany	Regional particle formation, evolution, and properties: Nested-grid GEOS-Chem (with APM) simulations and comparisons with measurements		Fangqun Yu
U. Edinburgh	Quantify the impact of boreal biomass burning outflow on tropospheric chemistry over the North Atlantic: Nested grid simulations and evaluation with ground-based, aircraft, and satellite observations		Mark Parrington
Emory University	Improving MISR Aerosol retrieval with GEOS-Chem simulated aerosol composition	NASA	Yang Liu
Peking University	Carbonaceous aerosols in China		May Fu
Peking University	Two-way nesting model for GESO-Chem and impacts on regional air quality and long-range transport		Jintai Lin
CSU	Investigation of inorganic aerosol and role of NH3 during CalNex		Luke Schiferl
Harvard	Application to SEAC4RS aircraft campaign in Southeast Asia		Jenny Fisher, Patrick Kim, Lin Zhang
Harvard	Variability of HCHO Over the Southeastern United States Observed from Space	NASA AQAST	Lei Zhu
UNL	GEOS-Chem Satellite Simulator for future sensors	NASA	Jun Wang Recent updates to nested GEOS-Chem Fixes to Streets emissions for model years 2005 and earlier This update was tested in the 1-month benchmark simulation v9-01-03f and approved on 17 Feb 2012. We discovered two bugs in the implementation of Streets emissions for the nested model. These will affect all nested simulations at least through v9-01-02 for model years 2005 and earlier. 1. The nested model was using Streets 2000 emissions for years 2001-2005 instead of Streets 2006 emissions, which the global model has been using since v8-03-01. This will be updated in GEOS-Chem v9-01-03. 2. Streets 2000 anthropogenic emissions include NOx, CO, and SO2 from ships, which leads to double-counting of ship emissions as well as improper treatment of NOx emissions. This problem is described in more detail on the ship emissions page. This will be updated in GEOS-Chem v9-01-03. --Jenny Fisher, 1 February 2012 Nested-grid capability for offline simulations The following offline simulations have been updated for the nested grid: Simulation Author Status Nested-grid CO2 simulation Yuxuan Wang (Tsinghua U.) Added to GEOS-Chem v9-01-03; released 14 Sep 2012 CH4 simulation (North America) Kevin Wecht (Harvard) Added to GEOS-Chem v9-01-03; released 14 Sep 2012 Hg simulation (North America) Yanxu Zhang (U. Washington) Slated for inclusion into GEOS-Chem v9-02 --Bob Y. 16:42, 14 September 2012 (EDT) Recent linking tool updates for GEOS-Chem and CMAQ On-going Developments 1. Modified for Code.v8-02-01 1). main.f, add following lines after DO_CHEMISTRY in line 941:  ! check STT (yxw) #if defined( GEOS_5 ) && defined( GRID05x0666 )  ! Loop over grid boxes !$OMP PARALLEL DO !$OMP+DEFAULT( SHARED ) !$OMP+PRIVATE( I, J, L, N ) DO N = 1, N_TRACERS DO L = 1, LLPAR DO J = 1, JJPAR DO I = 1, IIPAR  !---------------------------  ! Check for Negatives  !--------------------------- IF ( STT(I,J,L,N) < 0d0 ) THEN !$OMP CRITICAL WRITE( 6, 100 ) I, J, L, N, STT(I,J,L,N) PRINT*, 'Neg STT after chemistry ' // & 'SET STT TO BE ZERO' STT(I,J,L,N) = 0d0 !$OMP END CRITICAL  !---------------------------  ! Check for NaN's  !--------------------------- ELSE IF ( IT_IS_NAN( STT(I,J,L,N) ) ) THEN !$OMP CRITICAL WRITE( 6, 100 ) I, J, L, N, STT(I,J,L,N) PRINT*, 'NaN STT after chemistry ' // & 'SET STT TO BE LOWER LEVEL' STT(I,J,L,N) = STT(I,J,L-1,N) !$OMP END CRITICAL  !----------------------------  ! Check STT's for Infinities  !---------------------------- ELSE IF ( .not. IT_IS_FINITE( STT(I,J,L,N) ) ) THEN !$OMP CRITICAL WRITE( 6, 100 ) I, J, L, N, STT(I,J,L,N) PRINT*, 'Inf STT after chemistry ' // & 'SET STT TO BE LOWER LEVEL' STT(I,J,L,N) = STT(I,J,L-1,N) !$OMP END CRITICAL ENDIF ENDDO ENDDO ENDDO ENDDO !$OMP END PARALLEL DO #endif 2). main.f, add following lines after ITS_TIME_FOR_DIAG in line 1021:  ! Sometimes STT in the stratosphere can be negative at  ! the nested-grid domain edges. Force them to be zero before  ! CHECK_STT (yxw) #if defined( GEOS_5 ) && defined( GRID05x0666 )  ! Loop over grid boxes !$OMP PARALLEL DO !$OMP+DEFAULT( SHARED ) !$OMP+PRIVATE( I, J, L, N ) DO N = 1, N_TRACERS DO L = 1, LLPAR DO J = 1, JJPAR DO I = 1, IIPAR  !---------------------------  ! Check for Negatives  !--------------------------- IF ( STT(I,J,L,N) < 0d0 ) THEN !$OMP CRITICAL WRITE( 6, 100 ) I, J, L, N, STT(I,J,L,N) PRINT*, 'Neg STT after dynamics step ' // & 'SET STT TO BE ZERO' STT(I,J,L,N) = 0d0 !$OMP END CRITICAL ENDIF ENDDO ENDDO ENDDO ENDDO !$OMP END PARALLEL DO 100 FORMAT( ' STT(',i3,',',i3,',',i3,',',i3,') = ', f13.6 ) #endif --Wang,Chen, 05:13, 25 June 2009 (EDT) --[[User:Aaron van Donkelaar], March 4, 2010 How to run the 0.5x0.667 nested-grid for GEOS-5 We have moved this discussion to the following wiki pages: GEOS-Chem nested grid simulations Setting up GEOS-Chem nested grid simulations --Bob Y. 14:07, 15 November 2010 (EST) About linking tools TBD