Global nighttime atomic oxygen abundances from resampled GOMOS hydroxyl airglow measurements in the mesopause region

Abstract

This paper presents a new dataset of nighttime atomic oxygen density [O], derived from OH(8–4) ro-vibrational band emissions, using a non-local thermal equilibrium model, with the aim of offering new insight into the atomic oxygen abundances in the mesopause region. The dataset is based on the level-1 atmospheric background measurements observed by the GOMOS instrument on board Envisat. Raw data are reprocessed into monthly zonal mean values in 10◦ latitude bins with a fixed altitude grid of 3 km. The dataset spans from 70◦ S to 70◦ N in latitude and from 80 km to 100 km in altitude, covering 5 a time period from May 2002 to December 2011 at local times of from 10 p.m. to 12 p.m.. The atomic oxygen density peaks at about 95 km and the highest values are in the range of 3–8×1011 atoms cm−3, depending on latitude and season. There is a rapid decrease of [O] below its peak region. The annual oscillation (AO), semiannual oscillation (SAO), and the solar cycle impact are distinguished from the [O] longtime series variations. This new GOMOS [O] dataset conforms to other published datasets and is consistent with the [O] datasets obtained from the SCIAMACHY OH 10 airglow measurements to within about ±20 %.