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Sources and concentrations of gaseous and particulate reduced nitrogen in the city of Munster (Germany) [An article from: Atmospheric Environment]
Book Details
Author(s)E. Vogt, A. Held, O. Klemm
PublisherElsevier
ISBN / ASINB000RR7XKG
ISBN-13978B000RR7XK1
MarketplaceFrance 🇫🇷
Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in . 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:
Atmospheric ammonia mixing ratios and the main inorganic ions NH"4^+, NO"3^- and SO"4^2^- of size-resolved particles in the range from 0.05 to 10@mm were measured at an urban site in Munster, Germany. High mixing ratios of ammonia with a median of 5.2ppb and a maximum of 50ppb were detected. The mass fraction of submicron particles was much higher during the day than at night. At night, a greater particle mass and an increased presence of particulate nitrate was measured. Recurring patterns of particle distribution were distinguished and their characteristics analysed. In half of the measurements, the accumulation mode was clearly dominating, which is an indication of aged aerosol. In some measurements, higher concentrations of fine particles were found indicating particle formation. In these cases, a smaller particle mass and about four times greater ratios of ammonia versus ammonium concentrations were observed. These data show that ammonia contributes considerably to the formation of secondary particulate material.
Description:
Atmospheric ammonia mixing ratios and the main inorganic ions NH"4^+, NO"3^- and SO"4^2^- of size-resolved particles in the range from 0.05 to 10@mm were measured at an urban site in Munster, Germany. High mixing ratios of ammonia with a median of 5.2ppb and a maximum of 50ppb were detected. The mass fraction of submicron particles was much higher during the day than at night. At night, a greater particle mass and an increased presence of particulate nitrate was measured. Recurring patterns of particle distribution were distinguished and their characteristics analysed. In half of the measurements, the accumulation mode was clearly dominating, which is an indication of aged aerosol. In some measurements, higher concentrations of fine particles were found indicating particle formation. In these cases, a smaller particle mass and about four times greater ratios of ammonia versus ammonium concentrations were observed. These data show that ammonia contributes considerably to the formation of secondary particulate material.
