Export efficiency of black carbon aerosol in continental outflow: Global implications
[1] We use aircraft observations of Asian outflow from the NASATransport and Chemical Evolution over the Pacific (TRACE-P) mission over the NW Pacific in March–April 2001 to estimate the export efficiency of black carbon (BC) aerosol during lifting to the free troposphere, as limited by scavenging f...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.62.2708 2023-05-15T13:11:58+02:00 Export efficiency of black carbon aerosol in continental outflow: Global implications Rokjin J. Park Daniel J. Jacob Paul I. Palmer Antony D. Clarke Rodney J. Weber Mark A. Zondlo Fred L. Eisele Alan R. B Donald C. Thornton Glen W. Sachse Tami C. Bond The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.62.2708 http://www-as.harvard.edu/chemistry/trop/publications/ParkRJEA_jgr_2005.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.62.2708 http://www-as.harvard.edu/chemistry/trop/publications/ParkRJEA_jgr_2005.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-as.harvard.edu/chemistry/trop/publications/ParkRJEA_jgr_2005.pdf text 2005 ftciteseerx 2016-01-08T14:56:07Z [1] We use aircraft observations of Asian outflow from the NASATransport and Chemical Evolution over the Pacific (TRACE-P) mission over the NW Pacific in March–April 2001 to estimate the export efficiency of black carbon (BC) aerosol during lifting to the free troposphere, as limited by scavenging from the wet processes (warm conveyor belts and convection) associated with this lifting. Our estimate is based on the enhancement ratio of BC relative to CO in Asian outflow observed at different altitudes and is normalized to the enhancement ratio observed in boundary layer outflow (0–1 km). We 2 similarly estimate export efficiencies of sulfur oxides (SOx =SO2(g) + fine SO4) and total inorganic nitrate (HNO3 T = HNO3(g) + fine NO3) for comparison to BC. Normalized export efficiencies for BC are 0.63–0.74 at 2–4 km altitude and 0.27–0.38 at 4–6 km. Values at 2–4 km altitude are higher than for SOx (0.48–0.66) and HNO3 T (0.29–0.62), implying that BC is scavenged in wet updrafts but not as efficiently as sulfate or nitrate. Simulation of the TRACE-P period with a global three-dimensional model (GEOS-CHEM) indicates that a model timescale of 1 ± 1 days for conversion of fresh hydrophobic to hydrophilic BC provides a successful fit to the export efficiencies observed in TRACE-P. The resulting mean atmospheric lifetime of BC is 5.8 ± 1.8 days, the global burden is 0.11 ± 0.03 Tg C, and the decrease in Arctic snow albedo due to BC deposition is 3.1 ± 2.5%. Citation: Park, R. J., et al. (2005), Export efficiency of black carbon aerosol in continental outflow: Global implications, J. Geophys. Text albedo Arctic black carbon Unknown Arctic Pacific |
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English |
description |
[1] We use aircraft observations of Asian outflow from the NASATransport and Chemical Evolution over the Pacific (TRACE-P) mission over the NW Pacific in March–April 2001 to estimate the export efficiency of black carbon (BC) aerosol during lifting to the free troposphere, as limited by scavenging from the wet processes (warm conveyor belts and convection) associated with this lifting. Our estimate is based on the enhancement ratio of BC relative to CO in Asian outflow observed at different altitudes and is normalized to the enhancement ratio observed in boundary layer outflow (0–1 km). We 2 similarly estimate export efficiencies of sulfur oxides (SOx =SO2(g) + fine SO4) and total inorganic nitrate (HNO3 T = HNO3(g) + fine NO3) for comparison to BC. Normalized export efficiencies for BC are 0.63–0.74 at 2–4 km altitude and 0.27–0.38 at 4–6 km. Values at 2–4 km altitude are higher than for SOx (0.48–0.66) and HNO3 T (0.29–0.62), implying that BC is scavenged in wet updrafts but not as efficiently as sulfate or nitrate. Simulation of the TRACE-P period with a global three-dimensional model (GEOS-CHEM) indicates that a model timescale of 1 ± 1 days for conversion of fresh hydrophobic to hydrophilic BC provides a successful fit to the export efficiencies observed in TRACE-P. The resulting mean atmospheric lifetime of BC is 5.8 ± 1.8 days, the global burden is 0.11 ± 0.03 Tg C, and the decrease in Arctic snow albedo due to BC deposition is 3.1 ± 2.5%. Citation: Park, R. J., et al. (2005), Export efficiency of black carbon aerosol in continental outflow: Global implications, J. Geophys. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Rokjin J. Park Daniel J. Jacob Paul I. Palmer Antony D. Clarke Rodney J. Weber Mark A. Zondlo Fred L. Eisele Alan R. B Donald C. Thornton Glen W. Sachse Tami C. Bond |
spellingShingle |
Rokjin J. Park Daniel J. Jacob Paul I. Palmer Antony D. Clarke Rodney J. Weber Mark A. Zondlo Fred L. Eisele Alan R. B Donald C. Thornton Glen W. Sachse Tami C. Bond Export efficiency of black carbon aerosol in continental outflow: Global implications |
author_facet |
Rokjin J. Park Daniel J. Jacob Paul I. Palmer Antony D. Clarke Rodney J. Weber Mark A. Zondlo Fred L. Eisele Alan R. B Donald C. Thornton Glen W. Sachse Tami C. Bond |
author_sort |
Rokjin J. Park |
title |
Export efficiency of black carbon aerosol in continental outflow: Global implications |
title_short |
Export efficiency of black carbon aerosol in continental outflow: Global implications |
title_full |
Export efficiency of black carbon aerosol in continental outflow: Global implications |
title_fullStr |
Export efficiency of black carbon aerosol in continental outflow: Global implications |
title_full_unstemmed |
Export efficiency of black carbon aerosol in continental outflow: Global implications |
title_sort |
export efficiency of black carbon aerosol in continental outflow: global implications |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.62.2708 http://www-as.harvard.edu/chemistry/trop/publications/ParkRJEA_jgr_2005.pdf |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
albedo Arctic black carbon |
genre_facet |
albedo Arctic black carbon |
op_source |
http://www-as.harvard.edu/chemistry/trop/publications/ParkRJEA_jgr_2005.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.62.2708 http://www-as.harvard.edu/chemistry/trop/publications/ParkRJEA_jgr_2005.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766249778011701248 |