Difference between revisions of "Aircraft emissions"

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This page describes the aircraft emissions inventories used by GEOS-Chem.
 
This page describes the aircraft emissions inventories used by GEOS-Chem.
  
== FAA aircraft emissions inventory ==
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== MIT aircraft emissions inventory ==
  
''Note: These emissions are slated for inclusion into [[GEOS-Chem v9-01-03]] or later.''
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''Note: These emissions are slated for inclusion into [[GEOS-Chem v9-02i]].''
  
Monthly mean aircraft emissions from the [http://acmg.seas.harvard.edu/geos/wiki_docs/emissions/AEDT_Guidance_v2.0.pdf FAA AEDT emissions inventory v2.0] was developed by the FAA and was adapted for GEOS-Chem by [mailto:sbarrett@mit.edu Steven Barrett], [mailto:steveyim@mit.edu Steve Yim], [mailto:jaminkoo@mit.edu Jamin Koo], [mailto:aashok@mit.edu Akshay Ashok] et al from MIT.
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Monthly mean aircraft emissions were generated based on 2005 scheduling data from the [http://lae.mit.edu/?page_id=58 Aviation Emissions Inventory Code v2.0], developed by [mailto:nsimone@mit.edu Nick Simone] and based on research by [mailto:mejs@mit.edu Marc Stettler] under [mailto:sbarrett@mit.edu Steven Barrett]. These were implemented into GEOS-Chem by [mailto:seastham@mit.edu Sebastian D. Eastham].
  
This inventory contains the following species:
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The following are gridded at a horizontal resolution of 1&deg; x 1&deg. The emissions are vertically resolved in 60.9 m (200 ft) increments up to 1000 ft, and 1000 ft increments beyond that. The emissions are stored in NetCDF files and read in by <tt>aeic_mod.F</tt>:
  
# Fuel burned
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# Fuelburn
 
# CO
 
# CO
# Hydrocarbons (not included into GEOS-Chem)
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# Hydrocarbons
 
# NOx
 
# NOx
# Soot (i.e. black carbon)
 
# Organics (i.e. organic carbon)
 
  
BC and OC are derived from the soot & organics. SO2 and SO4 are derived from the total fuel burned.
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Black and organic carbon (BC/OC) are determined based on an emissions index of 0.03 g/kg fuel burn; sulfur emissions (sulfur dioxide and sulfates) are calculated assuming a fuel sulfur content of 600 ppm by mass and a sulfur conversion efficiency of 2%. The older aircraft NOx emissions have been removed wholesale, while the older sulfur emissions are enabled if AEIC emissions are disabled.
  
Running GEOS-Chem with the FAA AEDT v2.0 emissions gives us the following annual totals:
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--[[User:Sebastian D. Eastham|Sebastian D. Eastham]] 15:15, 9 June 2011 (EDT)
  
  NOx:  0.8118 Tg N
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== Old aircraft emissions inventory (prior to v9-02i) ==
  CO:  0.6329 Tg    (troposphere only)
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  SO2:  0.2212 Tg
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  SO4:  0.0068 Tg
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BCPI:  0.0059 Tg C
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OCPI:  0.0061 Tg C
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For more information, please see [http://acmg.seas.harvard.edu/geos/wiki_docs/emissions/FAA_AEDT_in_GEOS-Chem.pdf this validation document] (by Bob Yantosca) which describes how the FAA/AEDT emissions will be implemented into GEOS-Chem.
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--[[User:Bmy|Bob Y.]] 15:15, 9 June 2011 (EDT)
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== Old aircraft emissions inventory (prior to v9-01-02) ==
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=== NOx ===
 
=== NOx ===
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== References ==
 
== References ==
  
#Barrett, S., et al, ''Guidance on the use of AEDT Gridded Aircraft Emissions in Atmospheric Models Version 2.0'', <u>Federal Aviation Administration</u>, Washington DC, August 17, 2010.  [http://acmg.seas.harvard.edu/geos/wiki_docs/emissions/AEDT_Guidance_v2.0.pdf PDF]
 
 
#Baughcum, S.L., T.G. Tritz, S.C. Henderson, and D.C. Pickett, ''Scheduled civil aircraft emission inventories for 1992: Database development and analysis'', <u>NASA CR-4700</u>, Nat. Aeronaut. and Space Admin., Washington DC, 1996.
 
#Baughcum, S.L., T.G. Tritz, S.C. Henderson, and D.C. Pickett, ''Scheduled civil aircraft emission inventories for 1992: Database development and analysis'', <u>NASA CR-4700</u>, Nat. Aeronaut. and Space Admin., Washington DC, 1996.
 
#Chin, M., P. Ginoux, S. Kinne, O. Torres, B. Holben, B. N. Duncan, R. V. Martin, J. A. Logan, A. Higurashi, and T. Nakajima, ''Tropospheric aerosol optical thickness from the GOCART model and comparisons with satellite and sunphotometer measurements'', <u>J. Atmos. Sci.</u>, '''59''', 461–483, 2002.
 
#Chin, M., P. Ginoux, S. Kinne, O. Torres, B. Holben, B. N. Duncan, R. V. Martin, J. A. Logan, A. Higurashi, and T. Nakajima, ''Tropospheric aerosol optical thickness from the GOCART model and comparisons with satellite and sunphotometer measurements'', <u>J. Atmos. Sci.</u>, '''59''', 461–483, 2002.

Revision as of 19:18, 3 January 2013

This page describes the aircraft emissions inventories used by GEOS-Chem.

MIT aircraft emissions inventory

Note: These emissions are slated for inclusion into GEOS-Chem v9-02i.

Monthly mean aircraft emissions were generated based on 2005 scheduling data from the Aviation Emissions Inventory Code v2.0, developed by Nick Simone and based on research by Marc Stettler under Steven Barrett. These were implemented into GEOS-Chem by Sebastian D. Eastham.

The following are gridded at a horizontal resolution of 1° x 1&deg. The emissions are vertically resolved in 60.9 m (200 ft) increments up to 1000 ft, and 1000 ft increments beyond that. The emissions are stored in NetCDF files and read in by aeic_mod.F:

  1. Fuelburn
  2. CO
  3. Hydrocarbons
  4. NOx

Black and organic carbon (BC/OC) are determined based on an emissions index of 0.03 g/kg fuel burn; sulfur emissions (sulfur dioxide and sulfates) are calculated assuming a fuel sulfur content of 600 ppm by mass and a sulfur conversion efficiency of 2%. The older aircraft NOx emissions have been removed wholesale, while the older sulfur emissions are enabled if AEIC emissions are disabled.

--Sebastian D. Eastham 15:15, 9 June 2011 (EDT)

Old aircraft emissions inventory (prior to v9-02i)

NOx

The inventory of aircraft NOx used in GEOS-Chem is described in Wang et al [1998]:

For NO emissions from subsonic aircraft, we adopted the 1992 monthly mean emisison inventory compiled by Baughcum et al [1996] and Metwally [1995]; the inventory has a resolution of 1° x 1° x 1 km, and the global source is 0.51 Tg N/yr.

The source code to read data from the aircraft NOx emissions inventory is aircraft_nox_mod.f. Routine READAIR reads the files from disk at the start of each new month, and routine AIREMISS interpolates from the 1km vertical grid to the GEOS-3, GEOS-4, GEOS-5, or GCAP vertical grid.

For more information about the data files, please see the following READMEs:

  1. GEOS_0.5x0.666_CH/aircraft_NOx_200202/README
  2. GEOS_2x2.5/aircraft_NOx_200202/README
  3. GEOS_4x5/aircraft_NOx_200202/README

--Bob Y. 16:27, 25 February 2010 (EST)

Known issues

Due to the common block error described by Lee Murray, in GEOS-Chem v7-04-13 we have added a new module array (EMIS_AC_NOx) to "aircraft_nox_mod.f". The EMIS_AC_NOx array will be referenced in routine "setemis.f", which will pass the aircraft NOx emissions to the SMVGEAR solver. The old common-block array "GEMISNOX" will be removed.

SO2

From Park et al [2004]:

Other anthropogenic sources of SO2 in the model include gridded monthly aircraft emissions (0.07 Tg S/yr) taken from Chin et al. [2000a] ...

The aircraft emissions for SO2 are read from disk by routine READ_AIRCRAFT_SO2 in module sulfate_mod.f.

For more information about the data files, please see the following READMEs:

  1. GEOS_0.5x0.666_CH/sulfate_sim_200508/README
  2. GEOS_0.5x0.666_NA/sulfate_sim_200508/README
  3. GEOS_2x2.5/sulfate_sim_200508/README
  4. GEOS_4x5/sulfate_sim_200508/README

--Bob Y. 16:45, 25 February 2010 (EST)

References

  1. Baughcum, S.L., T.G. Tritz, S.C. Henderson, and D.C. Pickett, Scheduled civil aircraft emission inventories for 1992: Database development and analysis, NASA CR-4700, Nat. Aeronaut. and Space Admin., Washington DC, 1996.
  2. Chin, M., P. Ginoux, S. Kinne, O. Torres, B. Holben, B. N. Duncan, R. V. Martin, J. A. Logan, A. Higurashi, and T. Nakajima, Tropospheric aerosol optical thickness from the GOCART model and comparisons with satellite and sunphotometer measurements, J. Atmos. Sci., 59, 461–483, 2002.
  3. Metwally, M, Jet aircraft engine emissions database development--1992 military, charter, and nonscheduled traffic, NASA CR-4684, Nat. Aeronaut. and Space Admin., Washington DC, 1995.
  4. Park, R. J., D. J. Jacob, B. D. Field, R. M. Yantosca, and M. Chin, Natural and transboundary pollution influences on sulfate-nitrate-ammonium aerosols in the United States: implications for policy, J. Geophys. Res., 109, D15204, 10.1029/2003JD004473, 2004. PDF
  5. Wang, Y., D.J. Jacob, and J.A. Logan, Global simulation of tropospheric O3-NOx-hydrocarbon chemistry, 1. Model formulation, J. Geophys. Res., 103, D9,10,713-10,726, 1998. PDF

--Bob Y. 13:46, 4 April 2011 (EDT)