Removal of NOx and NOy in Asian outflow plumes: Aircraft measurements over the western Pacific in January 2002

N Takegawa; Y Kondo; M Koike; G Chen; T Machida; T Watai; D. R Blake; D. G Streets; J.‐H Woo; G. R Carmichael; K Kita; Y Miyazaki; T Shirai; J. B Liley; T Ogawa

doi:10.1029/2004JD004866

Back

Removal of NOx and NOy in Asian outflow plumes: Aircraft measurements over the western Pacific in January 2002

Journal article

Peer reviewed

Removal of NOx and NOy in Asian outflow plumes: Aircraft measurements over the western Pacific in January 2002

N Takegawa, Y Kondo, M Koike, G Chen, T Machida, T Watai, D. R Blake, D. G Streets, J.‐H Woo, G. R Carmichael, …

Journal of Geophysical Research: Atmospheres, Vol.109(D23), pp.D23S04-n/a

12/16/2004

DOI: 10.1029/2004JD004866

View Online

Abstract

The Pacific Exploration of Asian Continental Emission Phase A (PEACE‐A) aircraft measurement campaign was conducted over the western Pacific in January 2002. Correlations of carbon monoxide (CO) with carbon dioxide (CO2) and back trajectories are used to identify plumes strongly affected by Asian continental emissions. ΔCO/ΔCO2 ratios (i.e., linear regression slopes of CO‐CO2) in the plumes generally fall within the variability range of the CO/CO2 emission ratios estimated from an emission inventory for east Asia, demonstrating the consistency between the aircraft measurements and the emission characterization. Removal rates of reactive nitrogen (NOx and NOy) for the study region (altitude <4 km, 124°–140°E, 25°–45°N) are estimated using the correlation with CO2, the photochemical age of the plumes, and the NOx/CO2 emission ratio derived from the emission inventory. The plume age is estimated from the rates of hydrocarbon decay and hydroxyl radical (OH) concentration calculated using a constrained photochemical box model. The average lifetime of NOx is estimated to be 1.2 ± 0.4 days. Possible processes controlling the NOx lifetime are discussed in conjunction with results from earlier studies. The average lifetime of NOy is estimated to be 1.7 ± 0.5 days, which is comparable to the NOy lifetime of 1.7–1.8 days that has been previously reported for outflow from the United States. This similarity suggests the importance of chemical processing near the source regions in determining the NOy abundance.

removal process

Asian outflow

reactive nitrogen

Details

Title: Subtitle: Removal of NOx and NOy in Asian outflow plumes: Aircraft measurements over the western Pacific in January 2002
Creators: N Takegawa - University of Tokyo
Y Kondo - University of Tokyo
M Koike - University of Tokyo
G Chen - NASA Langley Research Center
T Machida - National Institute for Environmental Studies
T Watai - Global Environmental Forum
D. R Blake - University of California
D. G Streets - Argonne National Laboratory
J.‐H Woo - University of Iowa
G. R Carmichael - University of Iowa
K Kita - Ibaraki University
Y Miyazaki - University of Tokyo
T Shirai - Japan Aerospace Exploration Agency
J. B Liley - National Institute of Water and Atmospheric Research
T Ogawa - Japan Aerospace Exploration Agency
Resource Type: Journal article
Publication Details: Journal of Geophysical Research: Atmospheres, Vol.109(D23), pp.D23S04-n/a
DOI: 10.1029/2004JD004866
ISSN: 0148-0227
eISSN: 2156-2202
Number of pages: 16
Language: English
Date published: 12/16/2004
Academic Unit: Civil and Environmental Engineering; Nursing; Chemical and Biochemical Engineering
Record Identifier: 9984003907902771

Metrics

30 Record Views

40 Times Cited - Web of Science

See more details