OBSERVATIONS OF CLOUD CONDENSATION NUCLEI, SODIUM-CONTAINING PARTICLES, ICE NUCLEI AND THE LIGHT-SCATTERING COEFFICIENT NEAR BARROW, ALASKA.

Abstract

Measurements of the concentrations of cloud condensation nuclei (CCN), sodium-containing particles (SCP) and ice nuclei (IN), and the aerosol light-scattering coefficient were made near Barrow, Alaska, from 8-28 March 1970. The average concentrations of CCN (at 1% supersaturation) and SCP (in the size range 0. 06 to 1. 0 mu m) were 90 and 0. 2 cm** minus **3, respectively. The average concentration of IN at minus 20 degree C, measured with an NCAR counter without correcting for internal losses, was 0. 15 l** minus **1. The light-scattering coefficient was generally on the order of 5 multiplied by 10** minus **5 m** minus **1. Under stable meteorological conditions, the CCN appeared to be transported over large distances (400 km). Despite the comparative remoteness of the site, the measurements indicate that anthropogenic aerosols were present.