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Lightning NOx Source Emissions in GEOS-Chem

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Lightning NOx Source Emissions in GEOS-Chem. Lee T. Murray April 12, 2007 3rd GEOS-Chem Users’ Meeting Thanks to: Rynda Hudman, Bob Yantosca, Daniel Jacob, Jennifer Logan, Eric Leibensperger, Folkert Boersma, and others. NOxO 3. Current Annual NO x Source. Tg N/yr. Fossil Fuel Burning. - PowerPoint PPT Presentation
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Lightning NOx Lightning NOx Source Source Emissions in GEOS-Chem Emissions in GEOS-Chem Lee T. Murray Lee T. Murray April 12, 2007 April 12, 2007 3rd GEOS-Chem Users’ Meeting 3rd GEOS-Chem Users’ Meeting Thanks to: Rynda Hudman, Bob Yantosca, Daniel Thanks to: Rynda Hudman, Bob Yantosca, Daniel Jacob, Jennifer Logan, Eric Leibensperger, Jacob, Jennifer Logan, Eric Leibensperger, Folkert Boersma, and others Folkert Boersma, and others
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Page 1: Lightning NOx Source Emissions in GEOS-Chem

Lightning NOxLightning NOx Source Source Emissions in GEOS-ChemEmissions in GEOS-Chem

Lee T. MurrayLee T. MurrayApril 12, 2007April 12, 20073rd GEOS-Chem Users’ Meeting3rd GEOS-Chem Users’ MeetingThanks to: Rynda Hudman, Bob Yantosca, Daniel Jacob, Thanks to: Rynda Hudman, Bob Yantosca, Daniel Jacob, Jennifer Logan, Eric Leibensperger, Folkert Boersma, Jennifer Logan, Eric Leibensperger, Folkert Boersma, and othersand others

Page 2: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Lightning:An Important Source of NOx

[Hudman et al 2007a]

NOx O3

0.0 0.2 0.4 0.6ppbv

0 20 40 60 80 100ppbv

ModelObs

~50Total

0.1-1 (0.4)N2O Degradation

0.7-1 (0.7)Aviation

1-16 (5.5)Soil Emissions

1-20 (5-7)Lightning

4-24 (10)Biomass Burning

28-32 (28)Fossil Fuel Burning

Tg N/yrCurrent Annual NOx Source

[Schumann and Huntrieser 2007]

Page 3: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Global Lightning DistributionOptical Transient Detector (May 1995 -- Mar

2000)Lightning Imaging Sensor (Dec 1997 --

present)Combined HR Monthly Climatology

flashes / sec / box

Page 4: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Original Scheme(pre-v7.02.04)

Page 5: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

LNOx Parameterization

[Pickering 1998]

6 Tg N / yr[Martin et al 2002]

[Price and Rind 1992]

Scaled to CTH

Page 6: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Flashrate Parameterization

Z_IC

Z_CG

CTH

CC

Flashrate parameterization of Price and Rind [1992]

Fcontinental CTH4.9

Fmarine CTH1.73

IC/CG Ratio parameterization of Price and Rind [1993]

IC-CG Ratio CC4.0

Page 7: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Alternative Schemes CTH MFLUX PRECON

Ju

ly O

TD

-LIS

J

uly

2004

flashes/sec/box flashes/sec/box flashes/sec/box

flashes/sec/box

• MFLUX and PRECON params [Allen and Pickering 2002] recreate global distribution poorly with GEOS4 fields

• CTH [Price and Rind 1992] (including near-land) fits overall distribution but fails to capture relative flash rates

Page 8: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Regional Redistribution

• Scaling done at regional level allows model to drive interannual flashrate variability

• “v1” & “v2” redistribution product: 15 monthly regions with

⎟⎟⎠

⎞⎜⎜⎝

⎟⎟⎠

⎞⎜⎜⎝

=

Flashes GEOS Global

Flashes GEOSRegion

Flashes OTD Global

Flashes OTDRegion

torScalingFac

Page 9: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Improvements from RedistNO SCALING REG SCALING

July 2004

OTD-LIS July

Increased Obs-to-Model correlations in lightning flash rate, particularly during summer months

But rectilinear regions create discontinuities and

Page 10: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Improved Regional Redistributionk-means clustering: Comp. efficient algorithm to allow data-driven regional selection by iteratively minimizing distances between all data and k cluster centroids in an n-dimensional space

k = 20

20 total regions in space and time based on proximity in month, OTD-LIS (1995-2005 avg.) obs, GEOS-Chem output (1995-2005 avg.), and latitude.

Page 11: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Improved Regional Redistributionk-means clustering: Comp. efficient algorithm to allow data-driven regional selection by iteratively minimizing distances between all data and k centroids in an n-dimensional space

k = 20

20 total regions in space and time based on proximity in month, OTD-LIS (1995-2005 avg.) obs, GEOS-Chem output (1995-2005 avg.), and latitude.

Page 12: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

Improved Regional Redistributionk-means clustering: Comp. efficient algorithm to allow data-driven regional selection by iteratively minimizing distances between all data and k centroids in an n-dimensional space

k = 20

20 total regions in space and time based on proximity in month, OTD-LIS (1995-2005 avg.) obs, GEOS-Chem output (1995-2005 avg.), and latitude.

Page 13: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

k-means Clustering

v2 v3

Significant improvement in overall distribution and preventing discontinuities, while drastically reducing annual number of regions from 12 x 15 = 180 (v2) to 20 (v3).

OTD-LIS

Page 14: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

“Clustered” Redistribution

* 500 mol/fl in the N Midlats [Hudman et al 2007a]* 280 mol/fl in the tropics to match 4.4Tg tropics [Martin et al 2007]

Flashes/km2/6hr

Averaged model to climatology R = 0.92 Avg GC Monthly LNOx 1995-2006

[TgN/yr]

Jan 0.4261

Feb 0.3790

Mar 0.4456

April 0.4479

May 0.5584

June 0.6831

July 0.7654

Aug 0.7262

Sept 0.5587

Oct 0.5524

Nov 0.4916

Dec 0.4349

Total 6.4693

Page 15: Lightning NOx Source Emissions in GEOS-Chem

Lee T. MurrayHarvard Atmospheric Chemistry Modeling Group

April 12, 20073rd GEOS-Chem Users’ Meeting

lightning_nox_nl_mod.fIndividual NOx sources : ---=> Use aircraft NOx? : F=> Use lightning NOx? : T => OTD reg redist? : T => OTD local redist?: F => Use CTH param? : T => Use MFLUX param? : F => Use PRECON param?: F

%%% DIAGNOSTIC MENU %%% :ND56: Lightning flashes : 1 all

Category: LFLASH-$Tracer Names: L-RATE, IC-RATE, CG-RATETracer Numbers: 42001, 42002, 42003

Category: NOX-LI-$Tracer Names: NOxTracer Numbers: 1001

input.geos Options Diagnostic Options


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