Aerosol Properties during two IOPs at the ARM ENA Site
Poster PDF
Authors
Evgueni Kassianov — Pacific Northwest National Laboratory
Mikhail S. Pekour — Pacific Northwest National Laboratory
Connor J. Flynn — University of Oklahoma School of Meteorology
Janek Uin — Brookhaven National Laboratory
Thomas B. Watson — Brookhaven National Laboratory
Category
General topics – Aerosols
Description
The ENA site located in the Azores is equipped with a wide range of in situ instruments for measuring aerosol microphysical, chemical and optical properties. In particular, the Ultra-High Sensitivity Aerosol Spectrometer (UHSAS) measured the aerosol size distribution in the optical diameter range 70-1000 nm over an extended period (February 2014 to present). The Aerodynamic Particle Sizer (APS) measured the aerosol size distribution in the aerodynamic diameter range 500–20000 nm during two intensive operational periods (IOPs): early summer 2017 (June to July) and winter 2018 (January to February). Since these two instruments use different measurement principles and truly report different types of aerosol diameters (optical for UHSAS, aerodynamic for APS), producing a combined UHSAS-APS size distribution with a consistent geometric diameter (required for the aerosol-cloud interaction studies) is challenging and has far-reaching impacts on further process-oriented model evaluations. Here we discuss how the complementary information on aerosol chemical properties from the collocated Aerosol Chemical Speciation Monitor (ACSM) can be used to obtain the combined UHSAS-APS size distribution. We also discuss the consistency and reasonableness of the integrated aerosol data and consider the relative importance of the several environmental factors, such as wind speed and direction, on the temporal variability of the measured aerosol properties.
