2 Works

Laboratory evaluation of species-dependent relative ionization efficiencies in the Aerodyne Aerosol Mass Spectrometer

Wen Xu, Andrew Lambe, Philip Silva, , Timothy Onasch, Leah Williams, Philip Croteau, Xuan Zhang, Lindsay Renbaum-Wolff, Edward Fortner, Jose L. Jimenez, John Jayne, Douglas Worsnop & Manjula Canagaratna
Mass concentrations calculated from Aerodyne's aerosol mass spectrometers depend on particle collection efficiency (CE) and relative ionization efficiency (RIE, relative to the primary calibrant ammonium nitrate). We present new laboratory RIE measurements for a wide range of organic aerosol species (RIEOA). An improved laboratory RIE calibration protocol with size and mass selection of calibrant particles and a light scattering-based detection of CE is used. Simpler calibrations of alcohol RIEs using binary mixtures with NH4NO3 are...

Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland

Hilary A. Thompson, Jeffrey R. White & Lisa M. Pratt
Stable isotope compositions of organic carbon (δ13Corg) and nitrogen (δ15N) in macrophytes and sediments are useful in assessing sources of lake productivity and diagenesis of organic matter from formation through sedimentation to decomposition. Despite the increasing importance of high-latitude landscapes to carbon cycling under amplified and accelerating warming in the Arctic, the high density of small closed-basin lakes in this landscape, and the utility of stable isotopes in the study of carbon dynamics, limited data...

Registration Year

  • 2018

Resource Types

  • Text