Equatorial Kelvin wave signatures in ozone profile measurements from Global Ozone Monitoring Experiment (GOME)

Abstract

[1] This study investigates the ability to derive height-resolved information on equatorial Kelvin wave activity from three different Global Ozone Monitoring Experiment (GOME) ozone profile data sets. The ozone profiles derived using the Ozone Profile Retrieval Algorithm (OPERA) based on optimal estimation and the Neural Network Ozone Retrieval System (NNORSY) both show Kelvin wave signals in agreement with previously identified signals in the GOME total ozone columns. However, because of the inadequate vertical resolution, these two data sets are not able to resolve the vertical structure of the Kelvin wave activity. The third data set, consisting of assimilated OPERA ozone profiles, does provide height-resolved information on Kelvin wave activity that is consistent with results from the analysis of GOME total ozone columns and ECMWF Re-Analysis (ERA-40) temperature data. Largest Kelvin-wave-induced perturbations of up to 0.69 DU/km coincide with the maximum vertical gradient in ozone around 35 hPa and show an in-phase relationship with temperature perturbations in ERA-40 as expected from theoretical considerations. These results indicate that the ozone perturbations in the lower stratosphere and in the total column of ozone are transport related. Between 10 and 1 hPa, large Kelvin-wave-induced fluctuations in ozone mixing ratio are present that, however, because of their small contribution to the total column, do not constitute a large contribution to the total ozone column perturbations. The ozone perturbations between 10 and 1 hPa show an out-of-phase relationship with temperature perturbations in ERA-40, indicating that the perturbations can either be caused by transport effects or photochemical influences.

Equatorial Kelvin waves as revealed by EOS Microwave Limb Sounder observations and European Centre for Medium‐Range Weather Forecasts analyses: Evidence for slow Kelvin waves of zonal wave number 3

“…Several investigations have been made to establish the relation between variations in ozone and temperature associated with wave activity [see, e.g., Randel , 1990; Randel and Gille , 1991]. While Timmermans et al [2005a, 2005b] found a clear in‐phase relation between the observed ozone fluctuations from the Global Ozone Monitoring Experiment (GOME) and the temperature perturbations in the European Centre for Medium‐Range Weather Forecasts (ECMWF) ERA‐40 reanalysis, less conclusive results were obtained for UARS MLS temperature and ozone observations [ Mote and Dunkerton , 2004].…”

A Global Ozone Profile Climatology for Satellite Retrieval Algorithms Based on Aura MLS Measurements and the MERRA-2 GMI Simulation

“…Ozone profiles on a daily basis in the tropics are distorted by propagating tropical waves with periods of days to weeks such as Kelvin waves, equatorial Rossby waves, and mixed Rossbygravity waves (e.g., Timmermans et al, 2005;Ziemke and Stanford, 1994). As a result, the upper and lower stratospheric columns in Fig.…”

A global ozone profile climatology for satellite retrieval algorithms based on Aura MLS measurements and the MERRA-2 GMI simulation

“…7 are more representative of daily profiles than monthly means. Ozone profiles on a daily basis in the tropics are distorted by propagating tropical waves with periods of days to weeks such as Kelvin waves, equatorial Rossby waves and mixed Rossbygravity waves (e.g., Timmermans et al, 2005;Ziemke and Stanford, 1994). As a result, the upper-and lowerstratospheric columns in Fig.…”