Ground-based remote sensing of the atmospheric ozone over Moscow at millimeter waves

Rozanov, S. B.; Solomonov, S. V.; Kropotkina, E. P.; Ignatyev, A. N.; Lukin, Alexandr N.

doi:10.1117/12.688961

Cited by 2 publications

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“…Since 2005, numerous comparisons of the LPI ozone profiles with profiles obtained by the MLS Aura instrument [25] over Moscow were performed [26,27]. The comparisons showed that in most cases, the LPI profiles coincided with the MLS ones within the experimental errors of the instruments for both the quiet state of the stratosphere and disturbed cases when ozone profiles with two maxima were observed.…”

Section: Comparison Of Results With Other Researchmentioning

confidence: 99%

Statistical Analysis of 1996–2017 Ozone Profile Data Obtained by Ground-Based Microwave Radiometry

2020

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Trends in the ozone layer remain among the major problems of the atmosphere physics; thus, results of measurements of the ozone altitude distribution (profile), carried out in the same place and via the same method, are very important. This paper presents the results of the statistical analysis of ensembles of ozone profiles obtained from ground-based microwave radiometry data acquired at the P.N. Lebedev Physical Institute over a period of two decades (1996–2017). The data collected show the significant difference between monthly mean statistical parameters of ozone profiles of the decades 1996–2006 and 2007–2017. The main and unexpected result is the drastic decrease in monthly root-mean-square (rms) variances of ozone profiles over Moscow above 30 km in cold months of the decade 2007–2017 (if compared to the variances in the decade 1996–2006) with the maximum fall by 46% at 39 km in February monthly mean variances. The decade change of variances obtained by averaging over all nine months in the analysis (from September to May) has the same decrease with maximum fall by 25% at 38 km. Additionally, significant decade changes were revealed in other monthly mean statistical parameters: probability density of ozone profile variances, inter-altitude covariance and correlation functions, and time covariance and correlation—as well as their frequency spectra. The decade change of the ozone profile obtained by averaging over the nine months appeared much less significant: the decrease by 5.7% at the altitude of 19 km (with 1.5% sampling error), minor decrease by 2.6% (with sampling error 1.5%) in the profile maximum at 37 km, and increases of 1.7% at 28 km and 2.5% at 47 km (with sampling errors 1.7%)—lower and higher of this maximum. In addition to that, the corresponding averaged mean total column (integral) ozone content above 20 km remained practically unchanged: 4.61 g/m2 for decade 1996–2006 as compared to 4.58 g/m2 for 2007–2017. Possible explanations of revealed offsets are proposed and discussed.

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Section: Comparison Of Results With Other Researchmentioning

confidence: 99%

Statistical Analysis of 1996–2017 Ozone Profile Data Obtained by Ground-Based Microwave Radiometry

2020

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“…The molecule is one of the most dangerous ozone-destructive species, so it is important to do simultaneous measurements of O 3 and ClO vertical profiles in stratosphere. This will give an opportunity to estimate role of chemical ozone destruction over Moscow in the chlorine catalytic cycle in winter months when noticeable depletion of stratospheric ozone at altitudes 20-45 km may occur [7].…”

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Millimeter-wave spectrometers for remote sensing of ozone and other minor gases of the atmosphere

Rozanov

Solomonov

Ignatyev

et al. 2010

2010 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves

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Ozone plays very important role in the atmosphere because it protects life at the Earth's surface against the harmful solar UV-B radiation [1]. In the stratosphere, ozone critically controls the energy budget because it absorbs both solar UV and terrestrial IR radiation [1]. Spatial distribution and variations of the ozone content determine quantity and variations of the absorbed energy. Existing satellite instruments such as [2] can't provide both high resolution in horizontal plane and sufficiently dense data sets on concentration of ozone and ozonerelated species (in the first place, chlorine and nitrogen oxides) over selected regions. So reliable ground-based instruments for monitoring of ozone and other minor atmospheric gases are necessary in addition to the satellites.Ground-based millimeter-wave (MM-wave, microwave) instruments for monitoring of ozone and other molecules in stratosphere and mesosphere has a number of advantages over traditional optical instruments (UV spectrometers and lidars) and ozone sondes. The advantages are low dependence on weather conditions, broad altitude region, and possibility of continuous day-and-night measurements.Ozone observations in Moscow region are performed at P.N.Lebedev Physical Institute (LPI) of the Russian Academy of Sciences since 1987. At present, the upgraded version [3] of the spectrometer operating since 1996 is used for regular ozone observations. Vertical distribution of ozone at altitudes 12-75 km (up to 95 km at night) is retrieved from contour of the collisionally broadened 142.175 GHz ozone emission line. The instrument consists of low-noise heterodyne receiver based on Schottky-diode mixer, filter-bank spectrum analyzer and computer with special interfaces and software. The receiver SSB noise temperature is of about 1500 K at room temperature operation and of about 700 K under liquid nitrogen cooling. A back-wave oscillator is used as the first local oscillator of 138.5 GHz frequency. 96-channel spectrum analyzer has total bandwidth of 475 MHz. Its channel widths increase from 0.1 MHz at the ozone line center through steps of 0.2, 0.5, 2 and 5 MHz to 20 MHz at the line wings [3]. The set of channel widths was optimized to get both minimal distortions of the ozone line contour and approximately equal signal-to-noise ratio values in the channels. These provide the best accuracy of the ozone vertical profile retrieval. 96-channel ADC of DAQ-2208 type is used to digitize signals at the spectrum analyzer outputs. General view of the spectrometer is given in Fig. 1.A new transportable 142 GHz ozone spectrometer (ozonometer) is being created now at LPI. Its roomtemperature heterodyne receiver operating in amplitude-switching mode is based on planar Schottky diode mixer [4]. Both low-loss input Gaussian optics and solid-state Gunn-diode local oscillator are used in the receiver [5]. Optical block of the receiver includes antenna, chopper wheel, room-temperature (hot) calibration load, reference load with brightness temperature varying within 100-300 K, SSB fi...

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Ground-based remote sensing of the atmospheric ozone over Moscow at millimeter waves

Cited by 2 publications

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Statistical Analysis of 1996–2017 Ozone Profile Data Obtained by Ground-Based Microwave Radiometry

Statistical Analysis of 1996–2017 Ozone Profile Data Obtained by Ground-Based Microwave Radiometry

Millimeter-wave spectrometers for remote sensing of ozone and other minor gases of the atmosphere

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