Reconstruction of Data Gaps in Total-Ozone Records with a New Wavelet Technique

نویسندگان

1 Associate Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran

2 Assistant Professor, Atmospheric Sciences Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran

3 Assistant Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran

چکیده

This study introduces a new technique to fill and reconstruct daily observational of Total Ozone records containing void data for some days based on the wavelet theory as a linear time-frequency transformation, which has been considered in various fields of science, especially in the earth and space physics and observational data processing related to the Earth and space sciences. The initial corrupted records consist of six years of daily total Ozone measured by Dobson Photo-Spectrometer Instrument of Institute of Geophysics, University of Tehran. To verify the filled gaps resulted from this technique, the outputs of the proposed method are compared with the Total Ozone Mapping Spectrometer (TOMS) for the year 2005 and Ozone Monitoring Instrument (OMI) for the years 2006 – 2010 satellite data (hereafter used as TOMS/OMI data). The proposed technique consists of three steps: (1) quality control and denoising; (2) data-reconstruction based on Daubechies parent function (DB1); and (3) the combination of approximation and complementary coefficients using the Inverse Discrete Wavelet Transform (IDWT). Results show that this method was able to successfully reconstruct the missing data for gaps lasting no greater than 18 days. For gaps beyond this 18-day limit, however, this method was unable to reconstruct the voided data. As most instruments, including Dobson and Brewer Spectrometer, are working based on the optical interaction of stratospheric Ozone and sunshine, gaps in the Total-Ozone for more than 18 days should happen in atmospheric systems with longevity over 18 days in which overcast clouds persist longer than the 18-day limit. The proposed method could be applied with high efficiency. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Reconstruction of Data Gaps in Total-Ozone Records with a New Wavelet Technique

نویسندگان [English]

  • Majid M. Farahani 1
  • nafiseh Pegahfar 2
  • maryam Gharaylou 3
1 Associate Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran
2 Assistant Professor, Atmospheric Sciences Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran
3 Assistant Professor, Department of Space Physics, Institute of Geophysics, University of Tehran, Iran
چکیده [English]

This study introduces a new technique to fill and reconstruct daily observational of Total Ozone records containing void data for some days based on the wavelet theory as a linear time-frequency transformation, which has been considered in various fields of science, especially in the earth and space physics and observational data processing related to the Earth and space sciences. The initial corrupted records consist of six years of daily total Ozone measured by Dobson Photo-Spectrometer Instrument of Institute of Geophysics, University of Tehran. To verify the filled gaps resulted from this technique, the outputs of the proposed method are compared with the Total Ozone Mapping Spectrometer (TOMS) for the year 2005 and Ozone Monitoring Instrument (OMI) for the years 2006 – 2010 satellite data (hereafter used as TOMS/OMI data). The proposed technique consists of three steps: (1) quality control and denoising; (2) data-reconstruction based on Daubechies parent function (DB1); and (3) the combination of approximation and complementary coefficients using the Inverse Discrete Wavelet Transform (IDWT). Results show that this method was able to successfully reconstruct the missing data for gaps lasting no greater than 18 days. For gaps beyond this 18-day limit, however, this method was unable to reconstruct the voided data. As most instruments, including Dobson and Brewer Spectrometer, are working based on the optical interaction of stratospheric Ozone and sunshine, gaps in the Total-Ozone for more than 18 days should happen in atmospheric systems with longevity over 18 days in which overcast clouds persist longer than the 18-day limit. The proposed method could be applied with high efficiency. 

کلیدواژه‌ها [English]

  • Total-Ozone
  • Discrete Wavelet Transform
  • Missing data
  • interpolation
  • Signal reconstruction

مراجع

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فیزیک زمین و فضا
دوره 43، شماره 4
دی 1396
صفحه 73-81

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