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Assessment of the photochemistry of OH and NO"3 on Jeju Island during the Asian-dust-storm period in the spring of 2001 [An article from: Chemosphere]
Book Details
PublisherElsevier
ISBN / ASINB000RQYP8U
ISBN-13978B000RQYP88
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Description
This digital document is a journal article from Chemosphere, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
In this study, we examined the influence of the long-range transport of dust particles and air pollutants on the photochemistry of OH and NO"3 on Jeju Island, Korea (33.17^oN, 126.10^oE) during the Asian-dust-storm (ADS) period of April 2001. Three ADS events were observed during the periods of April 10-12, 13-14, and 25-26. Average concentration levels of daytime OH and nighttime NO"3 on Jeju Island during the ADS period were estimated to be about 1x10^6 and 2x10^8 moleculescm^-^3 (~9 pptv), respectively. OH levels during the ADS period were lower than those during the non-Asian-dust-storm (NADS) period by a factor of 1.5. This was likely to result from higher CO levels and the significant loading of dust particles, reducing the photolysis frequencies of ozone. Decreases in NO"3 levels during the ADS period was likely to be determined mainly by the enhancement of the N"2O"5 heterogeneous reaction on dust aerosol surfaces. Averaged over 24 h, the reaction between HO"2 and NO was the most important source of OH during the study period, followed by ozone photolysis, which contributed more than 95% of the total source. The reactions with CO, NO"2, and non-methane hydrocarbons (NMHCs) during the study period were major sinks for OH. The reaction of N"2O"5 on aerosol surfaces was a more important sink for nighttime NO"3 during the ADS due to the significant loading of dust particles. The reaction of NO"3 with NMHCs and the gas-phase reaction of N"2O"5 with water vapor were both significant loss mechanisms during the study period, especially during the NADS. However, dry deposition of these oxidized nitrogen species and a heterogeneous reaction of NO"3 were of no importance.
Description:
In this study, we examined the influence of the long-range transport of dust particles and air pollutants on the photochemistry of OH and NO"3 on Jeju Island, Korea (33.17^oN, 126.10^oE) during the Asian-dust-storm (ADS) period of April 2001. Three ADS events were observed during the periods of April 10-12, 13-14, and 25-26. Average concentration levels of daytime OH and nighttime NO"3 on Jeju Island during the ADS period were estimated to be about 1x10^6 and 2x10^8 moleculescm^-^3 (~9 pptv), respectively. OH levels during the ADS period were lower than those during the non-Asian-dust-storm (NADS) period by a factor of 1.5. This was likely to result from higher CO levels and the significant loading of dust particles, reducing the photolysis frequencies of ozone. Decreases in NO"3 levels during the ADS period was likely to be determined mainly by the enhancement of the N"2O"5 heterogeneous reaction on dust aerosol surfaces. Averaged over 24 h, the reaction between HO"2 and NO was the most important source of OH during the study period, followed by ozone photolysis, which contributed more than 95% of the total source. The reactions with CO, NO"2, and non-methane hydrocarbons (NMHCs) during the study period were major sinks for OH. The reaction of N"2O"5 on aerosol surfaces was a more important sink for nighttime NO"3 during the ADS due to the significant loading of dust particles. The reaction of NO"3 with NMHCs and the gas-phase reaction of N"2O"5 with water vapor were both significant loss mechanisms during the study period, especially during the NADS. However, dry deposition of these oxidized nitrogen species and a heterogeneous reaction of NO"3 were of no importance.
