Characteristics and error estimation of stratospheric ozone and ozone-related species over Poker Flat (65° N, 147° W), Alaska observed by a ground-based FTIR spectrometer from 2001 to 2003 A. Kagawa1,2, Y. Kasai2, N. B. Jones3, M. Yamamori2,4, K. Seki2,5, F. Murcray6, Y. Murayama2,7, K. Mizutani2, and T. Itabe2 1Fujitsu FIP Corporation, Tokyo, Japan 2National Institute of Information and Communications Technology, Tokyo, Japan 3Wollongong University, Wollongong, Australia 4Tsuru University, Yamanashi, Japan 5Mitsubishi Electric Corporation, Kanagawa, Japan 6University of Denver, Denver, USA 7National Institute of Polar Research, Tokyo, Japan
Abstract. It is important to obtain the year-to-year trend of stratospheric minor
species in the context of global changes.
An important example is the trend in global ozone depletion.
The purpose of this paper is to report the accuracy and precision of
measurements of stratospheric chemical species that are made at our
Poker Flat site in Alaska (65° N, 147° W). Since 1999,
minor atmospheric molecules have been observed using a Fourier-Transform
solar-absorption infrared Spectrometer (FTS) at Poker Flat.
Vertical profiles of the abundances of ozone, HNO3, HCl, and HF
for the period from 2001 to 2003 were retrieved from FTS spectra
using Rodgers' formulation of the Optimal Estimation Method (OEM).
The accuracy and precision of the retrievals were estimated by
formal error analysis. Errors for the total column were estimated
to be 5.3%, 3.4%, 5.9%, and 5.3% for ozone, HNO3, HCl, and HF,
The ozone vertical profiles were in good agreement with profiles
derived from collocated ozonesonde measurements that were smoothed with
averaging kernel functions that had been obtained with the retrieval
procedure used in the analysis of spectra from the ground-based FTS (gb-FTS).
The O3, HCl, and HF columns that were retrieved from the FTS
were consistent with Earth Probe/Total Ozone Mapping Spectrometer (TOMS)
and HALogen Occultation Experiment (HALOE) data over Alaska within
the error limits of all the respective datasets.
This is the first report from the Poker Flat FTS observation site
on a number of stratospheric gas profiles including a comprehensive
Citation: Kagawa, A., Kasai, Y., Jones, N. B., Yamamori, M., Seki, K., Murcray, F., Murayama, Y., Mizutani, K., and Itabe, T.: Characteristics and error estimation of stratospheric ozone and ozone-related species over Poker Flat (65° N, 147° W), Alaska observed by a ground-based FTIR spectrometer from 2001 to 2003, Atmos. Chem. Phys., 7, 3791-3810, doi:10.5194/acp-7-3791-2007, 2007.