The effect of chloride depletion of coarse sea-salt particles on atmospheric deposition at lithuanian coastal site

1998 ◽  
Vol 29 ◽  
pp. S683-S684
Author(s):  
V. Ulevicius ◽  
D. Sopauskiene ◽  
A. Juozaitis ◽  
K. Zeromskiene ◽  
S. Stapcinskaite
Keyword(s):  
Atmospheric Deposition ◽  
Sea Salt ◽  
Coastal Site ◽  
Chloride Depletion

scholarly journals Size distribution of particulate mercury in marine and coastal atmospheres

2012 ◽  
Vol 12 (22) ◽  
pp. 10899-10909 ◽  
Author(s):  
D. M. Feddersen ◽  
R. Talbot ◽  
H. Mao ◽  
B. C. Sive
Keyword(s):  
Size Distribution ◽  
Dry Deposition ◽  
Fine Particles ◽  
Elemental Mercury ◽  
Sea Salt ◽  
Coastal Site ◽  
Deposition Rates ◽  
Gaseous Elemental Mercury ◽  
Particulate Mercury ◽  
Marine Site

Abstract. A study was conducted to determine the size distribution of particulate mercury (HgP) at a marine and coastal site, and to compare the seasonal variability at both sites. Data was collected during summer 2009 and 2010, winter 2010, and spring 2010. Two cascade impactors were used to collect HgP in ten size fractions ranging from > 10 μm to < 0.4 μm. During summer 2009, HgP was found mainly (50–60%) in coarse fractions, 1.1 to 5.8 μm, composed of sea salt particles at both our coastal site (Thompson Farm) and marine site (Appledore Island). In winter, HgP at Thompson Farm was dominated (65%) by fine particles, while in spring and summer 2010, at both sites, HgP was distributed across the coarse and fine fractions (40% each). Using bulk filters to collect total HgP, we show a diurnal cycle that matches that of gaseous elemental mercury. Finally, dry deposition rates of HgP were calculated to be 1.7–2.8 ng m−2 day−1 in the summer, 4.6 ng m−2 day−1 in the winter, and 2.5 ng m−2 day−1 in the spring.

scholarly journals Atmospheric deposition of mercury and major ions to the Pensacola (Florida) watershed: spatial, seasonal, and inter-annual variability

2010 ◽  
Vol 10 (12) ◽  
pp. 5425-5434 ◽  
Author(s):  
J. M. Caffrey ◽  
W. M. Landing ◽  
S. D. Nolek ◽  
K. J. Gosnell ◽  
S. S. Bagui ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Atmospheric Deposition ◽  
Major Ions ◽  
Sea Salt ◽  
Emission Sources ◽  
Mercury Deposition ◽  
Industrial Activities ◽  
Sea Salt Aerosols ◽  
National Atmospheric Deposition Program ◽  
Mexico Coast

Abstract. Atmospheric deposition was measured at three sites in the Pensacola Bay watershed, Florida, between November 2004 and December 2007. Mercury deposition in the Pensacola Bay watershed was similar to that from nearby Mercury Deposition Network sites along the Northern Gulf of Mexico coast. Mercury deposition during the summer months is higher than other months due to higher concentrations in rainfall throughout the region. Deposition of constituents like H+, sulfate, nitrate, ammonium, chloride and sodium, were much higher in Pensacola Bay that at National Atmospheric Deposition Program (NADP) sites. Chloride and sodium deposition are higher because Pensacola Bay sites are closer to the Gulf of Mexico which is a source of sea salt aerosols. Acid rain constituents, H+, sulfate, nitrate and ammonium are most likely higher at Pensacola Bay sites because these sites are much closer to emission sources of these constituents than NADP sites, particularly two Florida NADP sites, FL14 and FL23, which are located in rural counties far from major industrial activities.

scholarly journals Identification of Ion sources in rainwater of a coastal site impacted by the gas and oil industry in the southeast of Mexico

2013 ◽  
Vol 10 (1) ◽  
pp. 92-100
Keyword(s):  
Ph Value ◽  
San Antonio ◽  
Agricultural Practices ◽  
Background Level ◽  
Oil Industry ◽  
Sea Salt ◽  
Common Source ◽  
Marine Aerosol ◽  
Coastal Site ◽  
The Impact

The purpose of this research was to study the chemical composition of rainwater to assess the impact of marine aerosol and anthropogenic emissions by using back air-mass trajectories. Fieldwork was done from July to November 2004, in a coastal site probably impacted by gas and oil industry in Campeche, Mexico: San Antonio Cardenas. Na+, Cl-, and Mg2+, were the most abundant ions, being sea-salt aerosol their unique source. A significant portion of K+ and Ca2+ originated from non-sea-salt sources; and the sulphate excess exceeded the background level reported for remote marine sites, suggesting that besides of marine aerosol, there was a significant contribution of SO42- from anthropogenic sources. NO3- concentrations in San Antonio Cardenas exceeded the background level reported for coastal sites with minimal anthropogenic influence and showed a significant correlation with SO42-, suggesting a common source. Agricultural practices are null, for this reason NH4+ levels were low. Mean pH value was 4.64, this acidity showed a good correlation with SO42- and NO3- levels, and with the local meteorology. A sour gas recompression plant located 10 km at NE from San Antonio Cardenas was identified as the main source of this strong acidity.

scholarly journals Regional characteristics of atmospheric sulfate formation in East Antarctica imprinted on 17O-excess signature

2021 ◽  
Author(s):  
Sakiko Ishino ◽  
Shohei Hattori ◽  
Michel Legrand ◽  
Qianjie Chen ◽  
Becky Alexander ◽  
...  
Keyword(s):  
Ice Cores ◽  
Sea Salt ◽  
East Antarctica ◽  
Relative Importance ◽  
Coastal Site ◽  
Austral Spring ◽  
Regional Characteristics ◽  
Chemical Destruction ◽  
Sulfate Formation ◽  
Potential Tool

&lt;p&gt;&lt;sup&gt;17&lt;/sup&gt;O-excess (&lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O = &lt;em&gt;&amp;#948;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O &amp;#8722; 0.52 &amp;#215; &lt;em&gt;&amp;#948;&lt;/em&gt;&lt;sup&gt;18&lt;/sup&gt;O) of sulfate trapped in Antarctic ice cores has been proposed as a potential tool for assessing past oxidant chemistry, while insufficient understanding of atmospheric sulfate formation around Antarctica hampers its interpretation. To probe influences of regional specific chemistry, we compared year-round observations of &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O of non-sea-salt sulfate in aerosols (&lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;#8722;&lt;/sup&gt;)&lt;sub&gt;nss&lt;/sub&gt;) at Dome C and Dumont d&amp;#8217;Urville, inland and coastal sites in East Antarctica, throughout the year 2011. Although &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;#8211;&lt;/sup&gt;)&lt;sub&gt;nss&lt;/sub&gt; at both sites showed consistent seasonality with summer minima (~1.0 &amp;#8240;) and winter maxima (~2.5 &amp;#8240;) owing to sunlight-driven changes in the relative importance of O&lt;sub&gt;3&lt;/sub&gt;-oxidation to OH- and H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;-oxidation, significant inter-site differences were observed in austral spring&amp;#8211;summer and autumn. The co-occurrence of higher &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;#8211;&lt;/sup&gt;)&lt;sub&gt;nss&lt;/sub&gt; at inland (2.0 &amp;#177; 0.1 &amp;#8240;) than the coastal site (1.2 &amp;#177; 0.1 &amp;#8240;) and chemical destruction of methanesulfonate (MS&lt;sup&gt;&amp;#8211;&lt;/sup&gt;) in aerosols at inland during spring&amp;#8211;summer (October to December), combined with the first estimated &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(MS&lt;sup&gt;&amp;#8211;&lt;/sup&gt;) of ~16 &amp;#8240;, implies that MS&lt;sup&gt;&amp;#8211;&lt;/sup&gt; destruction produces sulfate with high &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;#8211;&lt;/sup&gt;)&lt;sub&gt;nss&lt;/sub&gt; of ~12 &amp;#8240;. If contributing to the known post-depositional decrease of MS&lt;sup&gt;&amp;#8211;&lt;/sup&gt; in snow, this process should also cause a significant post-depositional increase in &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;#8211;&lt;/sup&gt;)&lt;sub&gt;nss&lt;/sub&gt; over 1 &amp;#8240;, that can reconcile the discrepancy between &lt;em&gt;&amp;#916;&lt;/em&gt;&lt;sup&gt;17&lt;/sup&gt;O(SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2&amp;#8211;&lt;/sup&gt;)&lt;sub&gt;nss&lt;/sub&gt; in the atmosphere and ice.&lt;/p&gt;

Sign in / Sign up

Export Citation Format

Share Document