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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-177
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
13 Jun 2016
Review status
This discussion paper has been under review for the journal Atmospheric Measurement Techniques (AMT). The revised manuscript was not accepted.
Atmospheric CO2 retrieval from ground based FTIR spectrometer over Shadnagar, India
Pathakoti Mahesh, Gaddamidi Sreenivas, Pamaraju Venkata Narasimha Rao, and Vinay Kumar Dadhwal National Remote Sensing Center (NRSC), Indian Space Research Organization (ISRO), Hyderbad-500037
Abstract. The column-averaged volume mixing ratio (vmr) of carbon dioxide (XCO2) has been retrieved over Shadnagar (Latitude = 17.03° N, Longitude = 78.21° E), India at Near Infrared (NIR) spectra using ground based high resolution (∆ν = 0.01 cm−1) Fourier Transform InfraRed (FTIR; model IFS125M) spectrometer. It is first of its kind in India for measuring columnar and vertical mixing ratios of atmospheric trace gases and other greenhouse gases (GHGs). In the present study, retrieval of XCO2 could be performed for a week at near Sun's nadir view (solar zenith angle-SZA, ±75.0°) using line-by-line radiative transfer algorithm (LBLRTA). Vertical profiles of CO2 have been retrieved at NIR and middle IR (MIR) spectra using a version of the Fast Atmospheric Signature Code 3 (FASCODE3) model which is for the retrieval of atmospheric trace gas profiles. Error residuals between measured and fitted atmospheric transmission lie with in ±1.0 % for CO2 (6180–6380 cm−1) and O2 (7800–7940 cm−1) respectively. During analysis period mean (standard deviation, 1σ) XCO2 was observed to be 385.24 ppm (4.22 ppm) with 1.0 % of daily variation. Minimum and maximum averaged molecular column densities of CO2 (O2) are 6.15 × 1021 (3.3 × 1024) molecules/cm2 and 8.06 × 1021 (4.72 × 1024) molecules/cm2 respectively. Obtained an average high signal to noise ratio (SNR) of 833 and 625 for NIR and MIR spectra, respectively.

Citation: Mahesh, P., Sreenivas, G., Rao, P. V. N., and Dadhwal, V. K.: Atmospheric CO2 retrieval from ground based FTIR spectrometer over Shadnagar, India, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-177, 2016.
Pathakoti Mahesh et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Referee comment', Anonymous Referee #1, 28 Jun 2016 Printer-friendly Version 
AC1: 'Atmospheric CO2 retrieval from ground based FTIR spectrometer over Shadnagar, India; Preliminary results', Mahesh Pathakoti, 02 Sep 2016 Printer-friendly Version Supplement 
 
RC2: 'Review of Mahesh et al.', Anonymous Referee #2, 19 Jul 2016 Printer-friendly Version 
Pathakoti Mahesh et al.
Pathakoti Mahesh et al.

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Short summary
The present study reports Column averaged concentration of CO2 over Shadnagar using Sun's spectra measured by ground based FTIR spectrometer. It is first of its kind in India for measuring columnar and vertical mixing ratios of atmospheric trace gases and other greenhouse gases (GHGs). In the present study, we attempted to retrieve columnar concentration and vertical profile of CO2 by utilising line-by-line radiative transfer algorithm (LBLRTA) and FASCODE3 inversion model.
The present study reports Column averaged concentration of CO2 over Shadnagar using Sun's...
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