Seasonal variation and size distributions of water-soluble inorganic ions and carbonaceous aerosols at a coastal site in Ningbo, China

2018 ◽  
Vol 639 ◽  
pp. 793-803 ◽  
Author(s):  
Jingjing Zhang ◽  
Lei Tong ◽  
Zhongwen Huang ◽  
Huiling Zhang ◽  
Mengmeng He ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Size Distributions ◽  
Carbonaceous Aerosols ◽  
Coastal Site ◽  
Water Soluble Inorganic Ions

Variation of carbonaceous aerosols and water soluble inorganic ions during winter haze in two consecutive years

2020 ◽  
Author(s):  
Aparna Satsangi ◽  
Ankita Mangal ◽  
Awni Agarwal ◽  
Anita Lakhani ◽  
K. Maharaj Kumari
Keyword(s):  
Inorganic Ions ◽  
Water Soluble ◽  
Carbonaceous Aerosols ◽  
Water Soluble Inorganic Ions

scholarly journals Modes in the size distributions and neutralization extent of fog-processed ammonium salt aerosols observed at Canadian rural locations

2012 ◽  
Vol 12 (2) ◽  
pp. 5519-5550
Author(s):  
X. H. Yao ◽  
L. Zhang
Keyword(s):  
Ammonium Sulfate ◽  
Ammonium Salt ◽  
Inorganic Ions ◽  
Dominant Mode ◽  
Water Soluble ◽  
Size Distributions ◽  
Minor Mode ◽  
Water Soluble Inorganic Ions ◽  
Acidic Conditions ◽  
A Minor

Abstract. Among the 192 samples of size-segregated water-soluble inorganic ions collected using a Micro-Orifice Uniform Deposit Impactor (MOUDI) at eight rural locations in Canada, ten samples were identified to have gone through fog processing. The supermicron particle modes of ammonium salt aerosols were found to be the fingerprint of fog processed aerosols. However, the patterns and the sizes of the supermicron modes varied with ambient temperature (T) and particle acidity and also differed between inland and coastal locations. Under T > 0 °C condition, fog-processed ammonium salt aerosols were completely neutralized and had a dominant mode at 1–2 μm and a minor mode at 5–10 μm if particles were in neutral condition, and ammonium sulfate was incompletely neutralized and only had a 1–2 μm mode if particles were in acidic conditions. Under T < 0 °C at the coastal site, fog-processed aerosols exhibited a bi-modal size distribution with a dominant mode of incompletely-neutralized ammonium sulfate at about 3 μm and a minor mode of completely-neutralized ammonium sulfate at 8–9 μm. Under T < 0 °C condition at the inland sites, fog-processed ammonium salt aerosols were sometimes completely neutralized and sometimes incompletely neutralized, and the size of the supermicron mode was in the range from 1 to 5 μm. Overall, fog-processed ammonium salt aerosols under T < 0 °C condition were generally distributed at larger size (e.g., 2–5 μm) than those under T > 0 °C condition (e.g., 1–2 μm).

Seasonal variation and secondary formation of size-segregated aerosol water-soluble inorganic ions during pollution episodes in Beijing

2016 ◽  
Vol 168 ◽  
pp. 70-79 ◽  
Author(s):  
Xiaojuan Huang ◽  
Zirui Liu ◽  
Junke Zhang ◽  
Tianxue Wen ◽  
Dongsheng Ji ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Inorganic Ions ◽  
Water Soluble ◽  
Secondary Formation ◽  
Water Soluble Inorganic Ions ◽  
Pollution Episodes

scholarly journals Characterization of the size-segregated water-soluble inorganic ions at eight Canadian rural sites

2008 ◽  
Vol 8 (4) ◽  
pp. 13801-13845 ◽  
Author(s):  
L. Zhang ◽  
R. Vet ◽  
A. Wiebe ◽  
C. Mihele ◽  
B. Sukloff ◽  
...  
Keyword(s):  
Warm Season ◽  
Inorganic Ions ◽  
Base Cations ◽  
Bimodal Distribution ◽  
Cold Season ◽  
Water Soluble ◽  
The Other ◽  
Size Distributions ◽  
Order Of Magnitude ◽  
Water Soluble Inorganic Ions

Abstract. Size-segregated water-soluble inorganic ions, including particulate sulphate (SO42-), nitrate (NO3-), ammonium (NH4+), chloride (Cl-) and base cations (K+, Na+, Mg2+, Ca2+), were measured using a Micro-Orifice Uniform Deposit Impactor (MOUDI) during fourteen short-term field campaigns at eight locations in both polluted and remote regions of eastern and central Canada. The size distributions of SO42- and NH4+ were unimodal, peaking at 0.3–0.6 μm in diameter, during most of the campaigns, although a bimodal distribution was found during one campaign and a trimodal distribution during another campaign made at a coastal site. The size distributions of NO3- were unimodal, peaking at 4.0–7.0 μm, during the warm-season campaigns and bimodal, with one peak at 0.3–0.6 μm and another at 4–7 μm, during the cold-season campaigns. A unimodal size distribution, peaking at 4–6 μm, was found for Cl-, Na+, Mg2+ and Ca2+ during approximately half of the campaigns and a bimodal distribution, with one peak at 2 μm and the other at 6 μm, was found during the rest of the campaigns. For K+, a bimodal distribution, with one peak at 0.3 μm and the other at 4 μm, was observed during most of the campaigns. The measured ion concentrations varied by one order of magnitude across the various sites. The air-mass origins and meteorological conditions both played important roles in formulating the observed geographical and seasonal patterns of these ion species concentration levels, size distributions and fine particle acidity.

scholarly journals Characterization of the size-segregated water-soluble inorganic ions at eight Canadian rural sites

2008 ◽  
Vol 8 (23) ◽  
pp. 7133-7151 ◽  
Author(s):  
L. Zhang ◽  
R. Vet ◽  
A. Wiebe ◽  
C. Mihele ◽  
B. Sukloff ◽  
...  
Keyword(s):  
Inorganic Ions ◽  
Bimodal Distribution ◽  
Meteorological Conditions ◽  
Water Soluble ◽  
The Other ◽  
Submicron Particles ◽  
Emission Sources ◽  
Size Distributions ◽  
Nucleation Mode ◽  
Water Soluble Inorganic Ions

Abstract. Size-segregated water-soluble inorganic ions, including particulate sulphate (SO42-), nitrate (NO3-), ammonium (NH4+), chloride (Cl-), and base cations (K+, Na+, Mg2+, Ca2+), were measured using a Micro-Orifice Uniform Deposit Impactor (MOUDI) during fourteen short-term field campaigns at eight locations in both polluted and remote regions of eastern and central Canada. The size distributions of SO42- and NH4+ were unimodal, peaking at 0.3–0.6 µm in diameter, during most of the campaigns, although a bimodal distribution was found during one campaign and a trimodal distribution was found during another campaign made at a coastal site. SO42- peaked at slightly larger sizes in the cold seasons (0.5–0.6 µm) compared to the hot seasons (0.3–0.4 µm) due to the higher relative humidity in the cold seasons. The size distributions of NO3- were unimodal, peaking at 4.0–7.0 µm during the warm-season campaigns, and bimodal, with one peak at 0.3–0.6 µm and another at 4–7 µm during the cold-season campaigns. A unimodal size distribution, peaking at 4–6 µm, was found for Cl-, Na+, Mg2+, and Ca2+ during approximately half of the campaigns and a bimodal distribution, with one peak at 2 µm and the other at 6 µm, was found during the rest of the campaigns. For K+, a bimodal distribution, with one peak at 0.3 µm and the other at 4 µm, was observed during most of the campaigns. Seasonal contrasts in the size-distribution profiles suggest that emission sources and air mass origins were the major factors controlling the size distributions of the primary aerosols while meteorological conditions were more important for the secondary aerosols. The dependence of the particle acidity on the particle size from the nucleation mode to the accumulation mode was not consistent from site to site or from season to season. Particles in the accumulation mode were more acidic than those in the nucleation mode when submicron particles were in the state of strong acidity; however, when submicron particles were neutral or weakly acidic, particles in the nucleation mode could sometimes be more acidic. The inconsistency of the dependence of the particle acidity on the particle size should have been caused by the different emission sources of all the related species and the different meteorological conditions during the different campaigns. The results presented here at least partially explain the controversial phenomenon found in previous studies on this topic.

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