Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation
This paper describes and assesses the performance of the RAL (Rutherford Appleton Laboratory) ozone profile retrieval scheme for the Global Ozone Monitoring Experiment 2 (GOME-2) with a focus on tropospheric ozone. Developments to the scheme since its application to GOME-1 measurements are outlined....
Published in: | Atmospheric Measurement Techniques |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2015
|
Subjects: | |
Online Access: | https://doi.org/10.5194/amt-8-385-2015 https://doaj.org/article/9e22bc3bf8fb4d3db76d230ac8cc368c |
id |
ftdoajarticles:oai:doaj.org/article:9e22bc3bf8fb4d3db76d230ac8cc368c |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:9e22bc3bf8fb4d3db76d230ac8cc368c 2023-05-15T18:25:47+02:00 Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation G. M. Miles R. Siddans B. J. Kerridge B. G. Latter N. A. D. Richards 2015-01-01T00:00:00Z https://doi.org/10.5194/amt-8-385-2015 https://doaj.org/article/9e22bc3bf8fb4d3db76d230ac8cc368c EN eng Copernicus Publications http://www.atmos-meas-tech.net/8/385/2015/amt-8-385-2015.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 1867-1381 1867-8548 doi:10.5194/amt-8-385-2015 https://doaj.org/article/9e22bc3bf8fb4d3db76d230ac8cc368c Atmospheric Measurement Techniques, Vol 8, Iss 1, Pp 385-398 (2015) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2015 ftdoajarticles https://doi.org/10.5194/amt-8-385-2015 2022-12-31T12:31:34Z This paper describes and assesses the performance of the RAL (Rutherford Appleton Laboratory) ozone profile retrieval scheme for the Global Ozone Monitoring Experiment 2 (GOME-2) with a focus on tropospheric ozone. Developments to the scheme since its application to GOME-1 measurements are outlined. These include the approaches developed to account sufficiently for UV radiometric degradation in the Hartley band and for inadequacies in knowledge of instrumental parameters in the Huggins bands to achieve the high-precision spectral fit required to extract information on tropospheric ozone. The assessment includes a validation against ozonesondes (sondes) sampled worldwide over 2 years (2007–2008). Standard deviations of the ensemble with respect to the sondes are considerably lower for the retrieved profiles than for the a priori, with the exception of the lowest subcolumn. Once retrieval vertical smoothing (averaging kernels) has been applied to the sonde profiles there is a retrieval bias of 6% (1.5 DU) in the lower troposphere, with smaller biases in the subcolumns above. The bias in the troposphere varies with latitude. The retrieval underestimates lower tropospheric ozone in the Southern Hemisphere (SH) (15–20% or ~ 1–3 DU) and overestimates it in the Northern Hemisphere (NH) (10% or 2 DU). The ability of the retrieval to reflect the geographical distribution of lower tropospheric ozone, globally (rather than just ozonesonde launch sites) is demonstrated by comparison with the chemistry transport model TOMCAT. For a monthly mean of cloud-cleared GOME-2 pixels, a correlation of 0.66 is found between the retrieval and TOMCAT sampled accordingly, with a bias of 0.7 Dobson Units. GOME-2 estimates higher concentrations in NH pollution centres but lower ozone in the Southern Ocean and South Pacific, which is consistent with the comparison to ozonesondes. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Huggins ENVELOPE(162.483,162.483,-78.283,-78.283) Pacific Southern Ocean Atmospheric Measurement Techniques 8 1 385 398 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 G. M. Miles R. Siddans B. J. Kerridge B. G. Latter N. A. D. Richards Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
This paper describes and assesses the performance of the RAL (Rutherford Appleton Laboratory) ozone profile retrieval scheme for the Global Ozone Monitoring Experiment 2 (GOME-2) with a focus on tropospheric ozone. Developments to the scheme since its application to GOME-1 measurements are outlined. These include the approaches developed to account sufficiently for UV radiometric degradation in the Hartley band and for inadequacies in knowledge of instrumental parameters in the Huggins bands to achieve the high-precision spectral fit required to extract information on tropospheric ozone. The assessment includes a validation against ozonesondes (sondes) sampled worldwide over 2 years (2007–2008). Standard deviations of the ensemble with respect to the sondes are considerably lower for the retrieved profiles than for the a priori, with the exception of the lowest subcolumn. Once retrieval vertical smoothing (averaging kernels) has been applied to the sonde profiles there is a retrieval bias of 6% (1.5 DU) in the lower troposphere, with smaller biases in the subcolumns above. The bias in the troposphere varies with latitude. The retrieval underestimates lower tropospheric ozone in the Southern Hemisphere (SH) (15–20% or ~ 1–3 DU) and overestimates it in the Northern Hemisphere (NH) (10% or 2 DU). The ability of the retrieval to reflect the geographical distribution of lower tropospheric ozone, globally (rather than just ozonesonde launch sites) is demonstrated by comparison with the chemistry transport model TOMCAT. For a monthly mean of cloud-cleared GOME-2 pixels, a correlation of 0.66 is found between the retrieval and TOMCAT sampled accordingly, with a bias of 0.7 Dobson Units. GOME-2 estimates higher concentrations in NH pollution centres but lower ozone in the Southern Ocean and South Pacific, which is consistent with the comparison to ozonesondes. |
format |
Article in Journal/Newspaper |
author |
G. M. Miles R. Siddans B. J. Kerridge B. G. Latter N. A. D. Richards |
author_facet |
G. M. Miles R. Siddans B. J. Kerridge B. G. Latter N. A. D. Richards |
author_sort |
G. M. Miles |
title |
Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation |
title_short |
Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation |
title_full |
Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation |
title_fullStr |
Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation |
title_full_unstemmed |
Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation |
title_sort |
tropospheric ozone and ozone profiles retrieved from gome-2 and their validation |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/amt-8-385-2015 https://doaj.org/article/9e22bc3bf8fb4d3db76d230ac8cc368c |
long_lat |
ENVELOPE(162.483,162.483,-78.283,-78.283) |
geographic |
Huggins Pacific Southern Ocean |
geographic_facet |
Huggins Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Atmospheric Measurement Techniques, Vol 8, Iss 1, Pp 385-398 (2015) |
op_relation |
http://www.atmos-meas-tech.net/8/385/2015/amt-8-385-2015.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 1867-1381 1867-8548 doi:10.5194/amt-8-385-2015 https://doaj.org/article/9e22bc3bf8fb4d3db76d230ac8cc368c |
op_doi |
https://doi.org/10.5194/amt-8-385-2015 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
8 |
container_issue |
1 |
container_start_page |
385 |
op_container_end_page |
398 |
_version_ |
1766207449006604288 |