Total ozone and NO2 vertical columns from UV-Visible spectrometer SAOZ at Concordia, Antarctica
Entry ID:
904_0_IPEV_FR
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Summary
Abstract:
Instrument History: The SAOZ (Système d'Analyse par Observation Zénithale, Goutail and Pommereau, 1988) instrument is part of the NDACC international network. There are 19 SAOZ owned by CNRS and other institutes at all latitudes including in the tropics. The SAOZ has been developed at Service d'Aéronomie (called LATMOS) in the late 1980s following the discovery of the ozone hole in Antarctica. ... The first SAOZ has been installed in 1988 at Dumont d'Urville in Antarctica to measure stratospheric ozone at high latitudes during the polar winter. In fact, the conventional techniques for measuring ozone in the ultraviolet range are useless for zenith angles greater than 80°. The SAOZ, which measures the absorption by the atmosphere of scattered sunlight at the zenith in the visible, allows the continuous monitoring of ozone in such conditions. In addition to the daily integrated ozone column, the SAOZ measures total NO2 column and determine the presence of polar stratospheric clouds from the color index.
The SAOZ was installed at Concordia in 2007 to evaluate ozone loss near the pole. This station is most of the time inside the polar vortex during the ozone depletion period (end of winter beginning of spring). It works continuously since then except during the polar night. The French Polar Institute (IPEV Institut Polaire Français Paul-Emile Victor) supplies recurrent funding and logistics.
Instrument description:
SAOZ is a UV-Visible diode array flat field spectrometer of 1 nm resolution looking at sunlight scattered at zenith during twilight. The SAOZ measures between 300 nm and 600 nm using the DOAS technique (Differential Optical Absorption Spectroscopy). As SAOZ was designed to measure especially in the Polar Regions, sometimes of difficult access, the system is completely automated, maintenance is simple (mechanical shutter). Due to very cold conditions in Concordia the instrument has been installed in a container and light is coming to the instrument through a sealed glass tube with pyrex windows and filled with dry nitrogen.
Main characteristics of the instrument:
- Jobin-Yvon CP200 spectrometer, 360 gr/mm, 300-600 nm
- Slit of 50 μ
- NMOS detector of 1024 pixels and the pre-amplifier
- Electronic device (commands and acquisition)
- Push-pull shutter for detector dark current correction
- GPS (card and antenna) for Solar Zenith Angle (SZA) and time calculation
- Interface box and a PC for processing data
- Box and sealed glass tube.
Algorithm description:
The data processing is achieved into 3 steps. The former two are realized in real time.
1. Acquisition of the spectrum and other parameters as GPS location and temperature inside the instrument (Level 0).
2. Spectroscopic analysis using the DOAS technique. Slant columns of different constituents are retrieved as ozone, NO2, O2, H2O and O4 (Level 1).
3. Conversion of slant columns into total columns by a single Air Mass Factor (AMF) using yearly mean profiles for Polar regions (Level 2 real time). Consolidated data are realized once a year using daily AMF calculated from ozone profiles climatology (Level 2 consolidate). 
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: -75.3
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S: -75.3
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E: 123.1
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W: 123.1
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Data Resolution
Latitude Resolution:
75°6S
Longitude Resolution:
123°20E
Temporal Resolution:
twice a day (sunrise and sunset)
Temporal Resolution Range:
Monthly - < Annual
Quality
Accuracy of the instrument
O3 data <3%
NO2 data <5%
Access Constraints
Access data through NDACC data base : ftp data extraction for Concordia SAOZ (Ozone and NO2)
Public data. Please inform investigator when using data. Email: Andrea.Pazmino@latmos.ipsl.fr
Use Constraints
Please acknowledge NDACC and IPEV in any presentation or publication using data.
Data Set Progress
IN WORK
Distribution
Distribution Media:
ELECTRONIC MEDIA > Online FTP
Distribution Size:
< 40 Ko (annual data)
Distribution Format:
ASCII > American Standard Code for Information Interchange
Fees:
Free
Personnel
Role:
INVESTIGATOR
Role:
DIF AUTHOR
Phone:
+33 (0)1 64 47 43 65
Fax:
+33 (0) 1 69 20 29 99
Email:
Andrea.Pazmino at latmos.ipsl.f
Contact Address:
LATMOS - IPSL
Route Forestière de Verrières
City:
Verrières-le-Buisson
Postal Code:
91370
Country:
France
Role:
TECHNICAL CONTACT
Phone:
+33 (0)1 64 47 42 83
Fax:
+33 (0) 1 69 20 29 99
Email:
Manuel.Pinharanda at latmos.ipsl.fr
Contact Address:
LATMOS - IPSL
Route Forestière de Verrières
City:
Verrières-le-Buisson
Postal Code:
91370
Country:
France
Publications/References
Pommereau, J.P., F. Goutail. O3 and NO2 Ground-Based Measurements by Visible Spectrometry during Arctic Winter and Spring 1988, Geophys. Res. Lett., 891, 1988. Pommereau, J.P., F. Goutail. Stratospheric O3 and NO2 Observations at the Southern Polar Circle in Summer and Fall 1988, Geophys. Res. Lett., 895, 1988. Roscoe, H.K., J.A.C Squires, D.J. Oldham, A. Sarkissian, J-P. Pommereau, F. Goutail. ... Improvements to the accuracy of zenith-sky measurements of total ozone by visible spectrometers, J. Quant. Spectrosc. Rad. Trans., 52, 639-648, 1994.
Hofmann, D.,J., P. Bonasoni, M. De Mazière, F. Evangelisti, A. Sarkissian, G. Giovanelli, A. Goldman, F. Goutail, J. Harder, R. Jakoubek, P. Johnston, J. Kerr, T. McElroy, R. McKenzie, G. Mount, J. P. Pommereau, P. Simon, S. Solomon, J. Stutz, A. Thomas, M. Van Roozendael, E. Wu. Intercomparison of UV/Visible Spectrometers for measurements of Stratospheric NO2 for the Network for the Detection of Stratospheric Change, J. Geophys. Res., 16,765-16,791, 1995.
Vandaele, A. C., C. Fayt, F. Hendrick, C. Hermans, F. Humbled, M. Van Roozendael, M. Gil, M. Navarro, O. Puentedura, M. Yela, G. Braathena, K. Stebelb, K. Tørnkvista, P. Johnston, K. Kreher, F. Goutail, A. Mieville, J.-P. Pommereau, S. Khaikine, A. Richter, H. Oetjen, F. Wittrock, S. Bugarski, U. Frieâ, K. Pfeilsticker, R. Sinreich, T. Wagner, G. Corlett, R. Leigh. An intercomparison campaign of ground-based UV-visible measurements of NO2, BrO, and OClO slant columns. Methods of analysis and results for NO2, Journal of Geophysical Research, 110, D8, D08305, 2005, DOI:10.1029/2004JD005423.
Denis, L., H. K. Roscoe, M. P. Chipperfield, M. Van Roozendael, F. Goutail. A new software suite for NO2 vertical profile retrieval from ground-based zenith-sky spectrometers, J. Quant. Spectrosc. Radiat. Transfer, 92, 3, 321-333, 2005.
Creation and Review Dates
DIF Creation Date:
2009-11-02
Last DIF Revision Date:
2012-01-26
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