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- W2020135690 abstract "Summertime measurements of the atmospheric concentrations and aerodynamic size distributions of NH 4 + and NO 3 − and other major aerosol species were made between 1991 and 1996 at a rural site in central Massachusetts to examine the nature of aerosol chemistry at the Harvard Forest. The bulk aerosol can be described as a mixture of submicron ammonium (bi)sulfate aerosols with smaller amounts of soil‐derived particles. Approximately one third of the samples had an anion surplus of greater than 20%, which was assumed to result from unmeasured H + ions. Aerosols in air masses from the southwest were rarely neutralized, especially when SO 4 2− concentrations were greater than ≈75 nmol m −3 . This result suggests that twice this level (i.e., 150 nmol m −3 ) may describe an upper limit to the amount of gaseous NH 3 encountered enroute to this sampling site during the typical summer transport observed from this region. Aerosol NO 3 − was observed at concentrations 4–8 times lower than NH 4 + , and while occasionally found in the fine mode, the majority of the NO 3 − was associated with the water‐soluble fraction of supermicron soil‐derived Ca 2+ . The similarity of the ammonium and oxalate particle size distributions suggests that (NH 4 ) 2 (COO) 2 aerosols may result from the reaction of gaseous precursors." @default.
- W2020135690 created "2016-06-24" @default.
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- W2020135690 date "2001-09-01" @default.
- W2020135690 modified "2023-10-14" @default.
- W2020135690 title "Summertime measurements of aerosol nitrate and ammonium at a northeastern U.S. site" @default.
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- W2020135690 doi "https://doi.org/10.1029/2000jd900693" @default.
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