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Global Model Performance Evaluation
Air Quality Division
Jim SmithSenior Photochemical Modeler
Air Quality Division
Presented to: Southeast Texas Photochemical Modeling Technical Committee
July 15, 2019
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 2
Overview
• Global modeling at TCEQ– Boundary conditions– Characterize international transport
• Modeling domain lateral boundaries• Vertical layer structure• Ozone boundary conditions• Data sources for global model performance evaluation• Performance evaluation using ozone sondes
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 3
Global Modeling at TCEQ
• Global chemical transport models used to establish chemical concentrations at boundaries of photochemical grid model (“boundary conditions”)– Four lateral boundaries– Top of 3-D modeling grid
• TCEQ runs GEOS-Chem, a global 3-D model of atmospheric chemistry driven by meteorological input from the Goddard Earth Observing System (GEOS)– Extract boundary conditions for Comprehensive Air quality Model
with extensions (CAMx)– Characterize international transport, influence of stratospheric ozone
(10 kilometers and above) on surface concentrations
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Global Modeling at TCEQ
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 5
Global Modeling at TCEQ
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 6
Global Modeling at TCEQ
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Global Modeling at TCEQ
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Global Modeling at TCEQ
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Global Modeling at TCEQ
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Global Modeling at TCEQ
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Global Modeling at TCEQ
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CAMx Modeling Domain Lateral Boundaries
• TCEQ 36 kilometer (km) domain for 2012 (black) and 2016 (red) platforms, with 12 km (blue) and 4 km (green) sub-domains
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 13
GEOS WRF CAMx
Vertical Layer Structure of Three Models
~ Depth of troposphere at 30⁰ N
GEOS WRF CAMx
Stratosphere
Mesosphere
Troposphere
72 la
yers
43 la
yers
29 la
yers
Stratosphere
Troposphere
*
* WRF (Weather Research and Forecasting) model supplies meteorological inputs to CAMx
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 14
Vertical Layer Structure of Three Models
GEOS WRF CAMx GEOS CAMx
Stratosphere
Mesosphere
Troposphere
Low
est 3
7 la
yers
29 la
yers
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 15
Ozone Boundary ConditionsJune 24 2012, 18:00 CST
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Data Sources for Evaluating Performance of Global Atmospheric Chemistry Models
Available Observation Datasets:
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 17
Data Sources for Evaluating Performance of Global Atmospheric Chemistry Models
Available Observation Datasets:
World Data Centre for Reactive Gases
World Ozone and Ultraviolet Radiation Data Centre
European Monitoring and Evaluation Programme
Aerosol, Clouds, and Trace Gases Research Infrastructure
Tropospheric Emission Spectrometer/Ozone Monitoring Instrument
Tropospheric Ozone Assessment Report
EPA AirNow Department of State
In-service Aircraft for Global Observing System
EPA Clean Air Status and Trends NetworkEPA+6 Others Interagency Monitoring of Protected Visual EnvironmentsEPA Air Quality SystemTropospheric Ozone LIDAR Network
Arctic Monitoring and Assessment Program
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Evaluating Performance of Global Atmospheric Chemistry Models
• TCEQ is working with Ramboll to establish procedures for comprehensive model performance evaluation of GEOS-Chem model for use in the 2012 and 2016 modeling platforms.
• Limited model performance evaluation for 2012 platform has been performed using available ozone sonde data.
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 19
Ozone Sonde Launch
• Demonstration launch at TCEQ headquarters on May 23, 2019
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• Locations of 2012 Ozone Sonde Launches Archived by National Oceanic and Atmospheric Administration/ Earth Systems Resource Lab (NOAA/ESRL)
Ozone Sondes
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Trinidad Head, California
• Important for observing/quantifying trans-Pacific transport of Asian pollution
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Trinidad Head, CaliforniaAugust-September 2012 Sonde Launches
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Boulder, ColoradoAugust-September 2012 Sonde Launches
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Huntsville, AlabamaAugust-September 2012 Sonde Launches
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Greenland SummitAugust-September 2012 Sonde Launches
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San Cristobal, Ecuador (Galapagos Is.)August-September 2012 Sonde Launches
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Evaluation of GEOS-Chem
• GEOS-Chem reasonably predicts observed ozone profiles through the troposphere, but over-predicts stratospheric ozone in temperate and tropical latitudes.
• Future work: Employ several additional performance measures to further assure the fidelity of CAMx inputs derived from global models.
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The Air Modeling & Data Analysis Section contributed to these results
Contact: [email protected]
Jim Smith – Senior Photochemical [email protected] 239-1941
Questions?
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Addendum
Additional Sonde
Launches
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Trinidad Head, CA
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Boulder, CO
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Huntsville, AL
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Hilo, HI
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Pago Pago, AS
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Greenland Summit
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South Pole
Air Quality Division • Global Model Performance Evaluation • JS • July 15, 2019 • Page 37
Suva, Fiji, and San Cristobal, Ecuador
