1,721,114 research outputs found
Transparent exopolymer particle and sodium concentrations for the ambient aerosol particles (total suspended particles, TSP) at Cape Verde islands
No full textTransparent exopolymer particle and sodium concentrations for cloud water samples at Cape Verde islands
No full textTransparent exopolymer particle and sodium concentrations for the tank generated aerosol particles (total suspended particles, TSP) at Cape Verde islands
No full textTransparent exopolymer particles (TEP) and sodium in ambient aerosol particles and cloud water at Cape Verde islands
No full textTransparent exopolymer particles (TEP) exhibit the properties of gels and may enter the atmosphere as part of sea spray aerosol. Here, we report number concentrations of TEP (diameter> 4.5 µm) in ambient aerosol (total suspended particles, TSP) and cloud water samples from the tropical Atlantic Ocean as well as in generated aerosol particles (PM10) using a plunging waterfall tank that was filled with the ambient sea water. Samples were taken during the MarParCloud: “Marine biological production, organic aerosol particles and marine clouds: a Process chain” campaign that took place from September 13th to October 13th 2017 at the Cape Verde archipelago Island Sao Vicente located in the Eastern Tropical North Atlantic (ETNA). Total suspended aerosol particle (TSP) for TEP analysis and PM10 sampling for sodium analysis was performed on top of a 30 m sampling tower of the CVAO. TSP were sampled with a filter sampler consisting of a filter holder equipped with a 0.2 µm pore-sized, acid-cleaned polycarbonate (PC) filter mounted to a pump. Sampling usually took place for 24 h and the flow of the pump was between 5 and 10 L min-1 and frequently measured with a flowmeter. Total volumes between 10 and 15 m3 were sampled. Cloud water was sampled on Mt. Verde, which is the highest point of the São Vicente Island (744 m), situated in the northeast of the Island (16°52.11ˈN, 24°56.02ˈW) and northwest to the CVAO. Bulk cloud water was collected using a compact Caltech Active Strand Cloudwater Collectors (CASCC2) equipped with acid cleaned Teflon®strands (508 µm diameter). Cloud droplets were caught on the strands and gravitationally channelled into an acid-precleared Nalgene bottle. TSP particles were sampled from a plunging waterfall tank experiment that consists of a 1400 L basin with a 500 L aerosol chamber on top. The bubble driven transport of organic matter was induced using a skimmer on a plunging waterfall. A stainless steel inlet was inserted in the headspace of the tank and connected with three filter holders for offline aerosol particle sampling without size segregation (TSP). The filter system for TEP analysis was equipped with a 0.2 µm pore-sized, acid-cleaned polycarbonate (PC) filter mounted to a pump. Sampling usually took place for ~ 24 h, the flow of the pump was between 5 and 10 L min-1 and frequently measured with a flowmeter. Total volumes between 9 and 10 m3 were sampled. The sampling procedure was therefore identical to the ambient TEP filter sampling. Another filter holder was equipped with a preheated 47 mm quartz fiber filter (Munktell, MK 360) for sodium analysis. The filters obtained from ambient and tank-generated TSP aerosol particle sampling and cloud water filtrations were stained with 3 mL of an Alcian blue stock solution stained (0.02 g Alcian blue in 100 mL of acetic acid solution, pH 2.5) for 5 s yielding an insoluble non-ionic pigment and afterward rinsed with milliQ water. For microscopic TEP analysis, abundance, area, and size-frequency distribution of TEP were determined using a light microscope (Zeiss Axio Scope A.1) connected to a camera (ColorView III). Filters were screened at 200× magnification. About 10 pictures were taken randomly from each filter in two perpendicular cross-sections (5 pictures each cross-section; dimension 2576 x 1932 pixel, 8-bit color depth). Images were then semi-automatically analyzed using ImageJ (Version 1.44). A minimum threshold value of 16 µm2 was set for particle size during particle analysis to remove the detection of non-aggregate material by the program. This resulted in a minimum particle size of 4.5 µm (assuming spherical particle). TEP number concentrations were converted to TEP volume concentrations. To this end, for atmospheric and for oceanic samples, particle number concentrations of TEP were extracted from the size distribution spectra and volume concentrations were calculated (assuming spherical particles). The analysis of sodium from PM10 samples was performed with ion chromatography and conductivity detection
Free neutral monosaccharides and combined monosaccharides in seawater and related saline matrices
No full textBulk seawater, surface microlayer, ice core and brine samples from the Arctic, the North and Tropical Atlantic and Raunefjorden were investigated on their sugar concentrations. Free neutral monosaccharides (DFCHO) and combined monosaccharides/polysaccharides (CCHO) were determined using high performance anionic exchange chromatography with pulsed amperometric detection (HPAEC-PAD) and electro-dialysis for prior desalination
Combined carbohydrates, organic carbon and total aerosol mass concentrations in size-resolved aerosol particles sampled from the Arctic in 2017
No full textSize-resolved aerosol particles were collected in the Arctic during the PS106 campaign (2017). For the collection of the aerosol particles, a five-stage low-pressure BERNER impactor was used. The size of the particles ranged between 50 nm and 10 µm. Sampling was conducted on board the German research vessel Polarstern. These aerosol particle samples were characterized on total aerosol mass concentration, combined carbohdrates (CCHO) and organic carbon (OC). Sampling altitude: ca. 25 m above sea level
(Table 2) Concentrations of pigments, DOC and microbial parameters in the Sea surface Microlayer (SML) and bulk water during MarParCloud at Cape Verde islands
No full textThis dataset comprises seawater data (bulk water and sea surface microlayer-SML) from the MarParCloud campaign performed at the Cape Verde island Sao Vicente at the Cape Verde Atmospheric Observatory (CVAO) in September/October 2017
(Table 1) Seawater chemistry during MarParCloud at Cape Verde islands
No full textThis dataset comprises seawater data (bulk water and sea surface microlayer-SML) from the MarParCloud campaign performed at the Cape Verde island Sao Vicente at the Cape Verde Atmospheric Observatory (CVAO) in September/October 2017
Inorganic ions in fog water sampled from the Arctic in 2017
No full textFog water samples were collected in the Arctic during the PS 106 campaign (2017). Sampling was conducted on board the German research vessel Polarstern. These fog water samples were characterized on the inorganic ions (sodium, potassium, magnesium, chloride, sulfate and more). Sampling altitude: ca. 21 m above sea level
Seawater data from MarParCloud at Cape Verde islands
No full textThis dataset comprises seawater data (bulk water and sea surface microlayer-SML) from the MarParCloud campaign performed at the Cape Verde island Sao Vicente at the Cape Verde Atmospheric Observatory (CVAO) in September/October 2017
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