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collection:
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nasa new
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nasa new
collection
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mediatype:
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texts
mediatype
texts
mediatype
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collection:
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nasa_techdocs
collection
nasa_techdocs
collection
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title:
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Global and Regional Decreases in Tropospheric Oxidants from Photochemical Effects of Aerosols
title
Global and Regional Decreases in Tropospheric Oxidants from Photochemical Effects of Aerosols
title
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description:
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We evaluate the sensitivity of tropospheric OH, O3, and O3 precursors to photochemical effects of aerosols not usually included in global models: (1) aerosol scattering and absorption of ultraviolet radiation and (2) reactive uptake of HO', NO2, and NO3. Our approach is to couple a global 3-D model of tropospheric chemistry (GEOS- CHEM) with aerosol fields from a global 3-D aerosol model (GOCART). Reactive uptake by aerosols is computed using reaction probabilities from a recent review (gamma(sub HO2) = 0.2, gamma(sub NO2) = 10(exp -4), gamma(sub NO3) = l0(exp -3). Aerosols decrease the O3 - O((sup 1)D) photolysis frequency by 5-20% at the surface throughout the Northern Hemisphere (largely due to mineral dust) and by a factor of 2 in biomass burning regions (largely due to black carbon). Aerosol uptake of HO2 accounts for 10-40% of total HOx radical ((triple bonds)OH peroxy) loss in the boundary layer over polluted continental regions (largely due to sulfate and organic carbon) and for more than 70% over tropical biomass burning regions (largely due to organic carbon). Uptake of NO2 and NO3 accounts for 10-20% of total HNO3 production over biomass burning regions and less elsewhere. Annual mean OH concentrations decrease by 9% globally and by 5-35% in the boundary layer over the Northern Hemisphere. Simulated CO increases by 5- 15 ppbv in the remote Northern Hemisphere, improving agreement with observations. Simulated boundary layer O3 decreases by 15- 45 ppbv over India during the biomass burning season in March and by 5-9 ppbv over northern Europe in August, again improving comparison with observations. We find that particulate matter controls would increase surface O3 over Europe and other industrial regions.
description
We evaluate the sensitivity of tropospheric OH, O3, and O3 precursors to photochemical effects of aerosols not usually included in global models: (1) aerosol scattering and absorption of ultraviolet radiation and (2) reactive uptake of HO', NO2, and NO3. Our approach is to couple a global 3-D model of tropospheric chemistry (GEOS- CHEM) with aerosol fields from a global 3-D aerosol model (GOCART). Reactive uptake by aerosols is computed using reaction probabilities from a recent review (gamma(sub HO2) = 0.2, gamma(sub NO2) = 10(exp -4), gamma(sub NO3) = l0(exp -3). Aerosols decrease the O3 - O((sup 1)D) photolysis frequency by 5-20% at the surface throughout the Northern Hemisphere (largely due to mineral dust) and by a factor of 2 in biomass burning regions (largely due to black carbon). Aerosol uptake of HO2 accounts for 10-40% of total HOx radical ((triple bonds)OH peroxy) loss in the boundary layer over polluted continental regions (largely due to sulfate and organic carbon) and for more than 70% over tropical biomass burning regions (largely due to organic carbon). Uptake of NO2 and NO3 accounts for 10-20% of total HNO3 production over biomass burning regions and less elsewhere. Annual mean OH concentrations decrease by 9% globally and by 5-35% in the boundary layer over the Northern Hemisphere. Simulated CO increases by 5- 15 ppbv in the remote Northern Hemisphere, improving agreement with observations. Simulated boundary layer O3 decreases by 15- 45 ppbv over India during the biomass burning season in March and by 5-9 ppbv over northern Europe in August, again improving comparison with observations. We find that particulate matter controls would increase surface O3 over Europe and other industrial regions.
description
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subject:
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LOW EARTH ORBITS
subject
LOW EARTH ORBITS
subject
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subject:
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SPECTRUM ANALYSIS
subject
SPECTRUM ANALYSIS
subject
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subject:
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GAS COMPOSITION
subject
GAS COMPOSITION
subject
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subject:
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ELECTRIC POTENTIAL
subject
ELECTRIC POTENTIAL
subject
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subject:
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SOLAR ARRAYS
subject
SOLAR ARRAYS
subject
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subject:
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EARTH ORBITAL ENVIRONMENTS
subject
EARTH ORBITAL ENVIRONMENTS
subject
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subject:
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MASS SPECTROMETERS
subject
MASS SPECTROMETERS
subject
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subject:
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HIGH VOLTAGES
subject
HIGH VOLTAGES
subject
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subject:
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VACUUM CHAMBERS
subject
VACUUM CHAMBERS
subject
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subject:
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CCD CAMERAS
subject
CCD CAMERAS
subject
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subject:
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PLASMA DENSITY
subject
PLASMA DENSITY
subject
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subject:
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PULSE DURATION
subject
PULSE DURATION
subject
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subject:
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THRESHOLD CURRENTS
subject
THRESHOLD CURRENTS
subject
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identifier:
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nasa_techdoc_2004011 1417
identifier
nasa_techdoc_2004011 1417
identifier
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licenseurl:
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uploader:
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gwilliam@archive.org
uploader
gwilliam@archive.org
uploader
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addeddate:
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2011-06-09 11:14:59
addeddate
2011-06-09 11:14:59
addeddate
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publicdate:
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2011-06-09 11:14:59
publicdate
2011-06-09 11:14:59
publicdate
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creator:
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Martin, Randall V.
creator
Martin, Randall V.
creator
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creator:
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Jacob, Daniel J.
creator
Jacob, Daniel J.
creator
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creator:
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Yantosca, Robert M.
creator
Yantosca, Robert M.
creator
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creator:
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Chin, Mian
creator
Chin, Mian
creator
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creator:
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Ginoux, Pau
creator
Ginoux, Pau
creator
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ImageUID:
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file:/home/lunaadmin /Source_download/201 106/1/nasa_techdoc_2 0040111417/200401114 17.pdf
ImageUID
file:/home/lunaadmin /Source_download/201 106/1/nasa_techdoc_2 0040111417/200401114 17.pdf
ImageUID
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date:
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2003
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rights:
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Public Domain
rights
Public Domain
rights
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ppi:
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300
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year:
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2003
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language:
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eng
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document-source:
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CASI
document_source
CASI
document-source
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documentid:
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20040111417
documentid
20040111417
documentid
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nasa-center:
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Goddard Space Flight Center; Langley Research Center
nasa_center
Goddard Space Flight Center; Langley Research Center
nasa-center
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online-source:
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http://wayback.archi ve-it.org/1792/20100 128012321/http://hdl .handle.net/2060/200 40111417
online_source
http://wayback.archi ve-it.org/1792/20100 128012321/http://hdl .handle.net/2060/200 40111417
online-source
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original-nasa-rights:
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Unclassified; No Copyright; Unlimited; Publicly available;
original_nasa_rights
Unclassified; No Copyright; Unlimited; Publicly available;
original-nasa-rights
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updated-added-to-ntrs:
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2005-11-24
updated_added_to_ntr s
2005-11-24
updated-added-to-ntr s
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contributor:
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NASA
contributor
NASA
contributor
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identifier-access:
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identifier_access
identifier-access
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identifier-ark:
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ark:/13960/t6k07zt16
identifier_ark
ark:/13960/t6k07zt16
identifier-ark
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ocr:
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ABBYY FineReader 8.0
ocr
ABBYY FineReader 8.0
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repub_state:
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4
repub_state
4
repub_state
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