Concentrations of carbonaceous and organic components and isotopic ratios- Eighth Chinese National Arctic Research Expedition (CHINARE) cruise _2017
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Concentrations of carbonaceous and organic components and isotopic ratios in Arctic aerosols during the eighth Chinese National Arctic Research Expedition (CHINARE) cruise, conducted onboard the Xuelong research vessel from July 20 to October 4, 2017, across the Western North Pacific (WNP) to the remote AO.
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The eighth Chinese National Arctic Research Expedition (CHINARE) cruise was conducted onboard the Xuelong research vessel from July 20 to October 4, 2017 across the Western North Pacific (WNP) to the remote AO. This cruise covers the central region of the AO (68-86 °N) with all transport gateways from the continents. Total suspended particles (TSP) were collected on pre-combusted (450°C for 6 h) quartz fiber filters using a large flow sampler ASM-1 (Mingye, Guangzhou, China) at 700 L/min on R/V Xuelong. A total of 34 samples and 1 blank filter were collected, whereas each TSP sample was collected for 48 hrs from 20 July to 4 October 2017. The aerosol sampler was mounted on the deck of the vessel around 10 m above the sea level. Carbonaceous aerosol concentrations were measured by a semi-continuous carbon analyzer (Model-4, Sunset Laboratory) following a faintly modified NIOSH 5040 thermal-optical transmission (TOT) protocol. The determination of δ13CTC was carried out using an elemental analyzer coupled with isotope ratio mass spectrometry (EA/irMS, MAT253). The radiocarbon isotopic composition (Δ14C) of the aerosol filters was analyzed using a modified elemental analyzer coupled with a gas interface to the Accelerator Mass Spectrometer Mini Carbon Dating System (MICADAS) at the University of Bern, Switzerland The sample filters were extracted with 7 mL of dichloromethane/methanol (2:1; v/v) under ultrasonication for 10 min. The solvent extracts were concentrated using a rotary evaporator under vacuum and then blown dry with nitrogen. The total extracts were then reacted with 50 µL of N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) with 1% trimethylsilyl chloride and 10 µL of pyridine in a glass vial (1.5 mL) with a Teflon-lined screw cap at 70°C for 3 h to derive trimethylsilyl derivatives. The derivatized total extracts were analyzed using a Hewlett-Packard model 6890 GC coupled to Hewlett-Packard model 5973 Mass-Selective Detector (MSD) on an electron impact (EI) mode at 70 eV and scanned from 50 to 650 Daltons. Mass spectral data were acquired and processed using the Hewlett-Packard Chemstation software.