The ozone vertical structure determining from ground-based Fourier spectrometer solar IR radiation measurements

Ya.A. Virolainen, Yu.M. Timofeyev, D.V. Ionov, V.S. Kostsov, and A.V. PoberovskySt. Petersburg State University, Russia (mail to: Yana.Virolainen@JV14952.spb.edu)

200

300

400

500

TotalOzone,DU

FTIROMI-TOMSM-124GOME-2

04/09 10/09 04/10 10/10 04/11 10/11 04/12

04/09 10/09 04/10 10/10 04/11 10/11 04/12-20

-10

0

10

20

(FTIR-X)/FTIR,%

DeviceNumbe

r of days

S, % M, % σ, %

Correlatio

n ρ

OMI-TOMS

178 4.5 3.4 2.9 0.98±0.003

GOME-2 95 3.7 2.2 3.0 0.97±0.006

M-124 188 4.6 2.6 3.9 0.96±0.006

200 300 400 500FTIR, DU

200

300

400

500

OMI-TOMS,DU = 2.9%

= 0.98

200 300 400 500FTIR, DU

200

300

400

500

M-124,DU

= 3.9% = 0.96

200 300 400 500M-124, DU

200

300

400

500

OMI-TOMS,DU

= 5.0% = 0.95

Ozone total column retrieval For ozone column comparison the following devices were selected: Satellite - OMI-TOMS, GOME2-DOAS (500 km coincidence) and Ground-based M-124 filter ozonometer (Voeykovo station, 59°57’N, 30°42’E)

N

iii yx

NM

1

2)(1

N

iii yx

NS

1

)(1

N

iii Myx

N 1

2)(1

1

Statistical characteristics of the comparison

RMS Difference:

Standard deviation: Mean Difference:

The ground-based measurements of the direct solar IR radiance by Bruker FTIR spectrometer with high spectral resolution (~0.005 cm-1) has been considered. The spectra measured at St. Petersburg State University (59.88N, 29.82E) in 2009-2012 have been analyzed. The retrieval task has been processed using PROFFIT software. The ozone total column amount as well as the content in thick atmospheric layers has been obtained. The results have been compared to independent ground-based and satellite measurements.

Instrumentationsolar FTIR-spectrometer Bruker 125HR with spectral resolution of

~0.005 cm-1

Location Peterhof - St. Petersburg (59.88 N, 29.82 E)

Time series 04.2009-03.2012 (189 days)

Retrieval codes PROFFIT9.6 (Tikhonov-Philips retrieval method)

Microwindows, cm-

1

991.25-993.80, 1001.47-1003.04, 1005.00-1006.90, 1007.35-1009.00, 1011.15-1013.55

Introduction

Ozone column near St. Petersburg in 2009-2012

Temporal variations of stratospheric (SOC) and tropospheric (TOC) ozone

column near St. PetersburgCorrelations between different measurement series

Conclusions: Minimum of ozone column means and its variations is observed in summer and autumn.

Maximum of mean difference between different kinds of measurements is observed in winter - FTIR measurements give higher values of ozone column than other instruments.

Standard deviation of different series of measurements is in the range of the accuracy of both instruments (2.9-3.9%). Correlation coefficient totals 0.96-0.98.

Acknowledgements: The authors thank Dr. F. Hase from KIT for providing PROFFIT software and Dr. A.M. Shalamyansky from Voeykovo Geophysical Observatory for M-124 ozonometer data.

This work has been partly supported by Min. Education and Science grants in the frame of Federal Purposive Program “Scientific and Educational Pool of Innovational Russia” 16.740.11.0048 from 31.08.2010 and grant of Russian Foundation for Basic Research 12-05-00596.

04/09 10/09 04/10 10/10 04/11 10/11 04/12

80

160

240

OC9-20km,DU

04/09 10/09 04/10 10/10 04/11 10/11 04/12120

160

200

240

OC20-55km,DU

FTIRMLS

-40

-20

0

20

40

(FTIR-MLS)/FTIR,%

-20

-10

0

10

20

(FTIR-MLS)/FTIR,%

Difference 20-55 km

Difference 9-20 km

Ozone column in thick atmospheric layers Ozone column retrieved by FTIR-method in thick atmospheric layers is compared to EOS-Aura MLS satellite data (500 km coincidence) –

profiles from 9 to 55km.

Layer (km)

DeviceMean

column, DUS, % M, % σ, % ρ

9-20FTIR 122±37

12.9 -0.3 12.9 0.90±0.01MLS 122±33

20-55FTIR 188±20

6.0 0.3 6.0 0.82±0.02MLS 187±16

04/09 10/09 04/10 10/10 04/11 10/11 04/1210

20

30

40

50FTIRTOC0-9km,DU

04/09 10/09 04/10 10/10 04/11 10/11 04/12200

300

400

SOC9-55km,DU FTIR

MLS

-20

-10

0

10

20

(FTIR-MLS)/FTIR,%

Difference 9-55 km

Season (days)

DeviceMean

column, DUS, % M, % σ, % ρ

Winter (30)

FTIR 338±456.1 3.2 5.3 0.92±0.03

MLS 327±44

Spring (58)

FTIR 341±345.2 -1.0 5.1

0.87±0.03MLS 344±35

Summer (72)

FTIR 287±243.6 -0.4 3.6

0.90±0.02MLS 288±23

Autumn (21)

FTIR 261±255.6 0.0 5.7

0.82±0.07MLS 261±24

All (181)

FTIR 310±445.0 0.1 5.0

0.94±0.01MLS 310±43

Statistical characteristics of FTIR and MLS SOC measurements

Correlations between stratospheric ozone column measurements (FTIR and MLS) for different seasons

Comparison of ozone column measurements in two stratospheric layers by FTIR and MLS devices

200 300 400 500SOC 9-55 km - FTIR, DU

200

300

400

500

SOC9-55km-MLS,DU

200 300 400 500SOC 9-55 km - FTIR, DU

200

300

400

500

SOC9-55km-MLS,DU

200 300 400 500SOC 9-55 km - FTIR, DU

200

300

400

500

SOC9-55km-MLS,DU

200 300 400 500SOC 9-55 km - FTIR, DU

200

300

400

500

SOC9-55km-MLS,DU

Winter Spring

Summer Autumn

= 0.92 = 5.3%

= 0.87 = 5.1%

= 0.90 = 3.6%

= 0.82 = 5.7%

Conclusions: The coincidence between two types of stratospheric ozone column measurements (Satellite MLS and ground-based FTIR) is better than 10% in the most cases. The standard deviation from mean difference for both instruments totals 5% (for 181 days in 2009-2012). The natural variability of SOC is about 15% for this period. The mean difference between FTIR and MLS measurement series of 3% is observed only in winter time.

No mean difference between two instruments is observed in ozone measurements in two stratospheric layers (9-20 and 20-55 km). Standard deviation between two series in middle and high stratosphere totals 6%, natural variability of ozone column is about 10%. In lower stratosphere standard deviation from mean difference of two instruments totals 13%, natural variability – 30%.References: Poberovsky A.V. Ground-based direct solar IR radiation measurements with a high spectral resolution //

Atmospheric and Oceanic Optics. 2010. V. 23, No.01. P. 56-58Ya. A. Virolainen, Yu. M. Timofeev, D. V. Ionov, A. V. Poberovskii, and A. M. Shalamyanskii Ground-Based Measurements of Total Ozone Content by the Infrared Method // Izvestiya, Atmospheric and Oceanic Physics. 2011. Vol. 47. No. 4. P. 480-490.