Aircraft emissions
This page describes the aircraft emissions inventories used by GEOS-Chem.
FAA aircraft emissions inventory
Starting with GEOS-Chem v9-01-02, we have implemented monthly mean aircraft emissions from the FAA AEDT emissions inventory. This inventory was developed by the FAA and was adapted for GEOS-Chem by Steven Barrett, Steve Yim, Jamin Koo et al from MIT.
This inventory contains the following species:
- Fuel burned
- CO
- Hydrocarbons
- NOx
- Soot
- Organics
The hydrocarbon emissions are not included into GEOS-Chem.
For more information about the data files, please see the following READMEs:
- GEOS_0.5x0.666_CH/FAA_201104/README
- GEOS_0.5x0.666_NA/FAA_201104/README
- GEOS_1x1/FAA_201104/README
- GEOS_2x2.5/FAA_201104/README
- GEOS_4x5/FAA_201104/README
For more information about the AEDT emissions inventory, please see this document from the FAA.
--Bob Y. 13:48, 4 April 2011 (EDT)
Old aircraft emissions inventory (prior to v9-01-02)
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:
- GEOS_0.5x0.666_CH/aircraft_NOx_200202/README
- GEOS_2x2.5/aircraft_NOx_200202/README
- 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:
- GEOS_0.5x0.666_CH/sulfate_sim_200508/README
- GEOS_0.5x0.666_NA/sulfate_sim_200508/README
- GEOS_2x2.5/sulfate_sim_200508/README
- GEOS_4x5/sulfate_sim_200508/README
--Bob Y. 16:45, 25 February 2010 (EST)
References
- Barrett, S., et al, Guidance on the use of AEDT Gridded Aircraft Emissions in Atmospheric Models Version 2.0, Federal Aviation Administration, Washington DC, August 17, 2010. 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, NASA CR-4700, 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, J. Atmos. Sci., 59, 461–483, 2002.
- 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.
- 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
- 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)