Atmospheric hydroxyl radical (OH) abundances from ground-based ultraviolet solar spectra: an improved retrieval method

Cheung, Ross; Li, King Fai; Wang, Shuhui; Pongetti, Thomas J.; Cageao, R. P.; Sander, Stanley P.; Yung, Yuk L.

doi:10.1364/ao.47.006277

Cited by 7 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the iteration results meet the accurate requirements of the research, the OH concentrations can be obtained. The OH concentrations obtained by the LSUV retrieval algorithm are credible in the upper atmosphere which are the same as the results of MAHRSI and SHIMMER (Conway et al, 1999;Englert et al, 2010). However, the OH concentrations in the lower atmosphere such as below 30 km are unsuitable for scientific research because the interference factors like water vapor and ozone are too large.…”

Section: Discussionsupporting

confidence: 77%

“…The development of satellite technology has enabled the chance of global widescale OH detection. Conway et al (1999) retrieved OH concentrations by the least-squares fitting method until the success of the Middle Atmosphere High Resolution Spectrograph Investigation (MAHRSI) which provided the first observed data of OH in the mesosphere with diffraction-grating technology from space. A new interferometric technology called spatial heterodyne spectroscopy has been applied to the Spatial Heterodyne Imager for Mesospheric Radicals (SHIMMER) for reaching the higher spectral resolution on the mid-deck of the space shuttle with a small size and no mobile optical components.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tomographic retrieval algorithm of OH concentration profiles using double spatial heterodyne spectrometers

Gao

et al. 2020

Atmos. Meas. Tech.

View full text Add to dashboard Cite

Abstract. The hydroxyl radical (OH) determines the capability of atmospheric self-cleansing and is one of the significant oxidants in atmospheric photochemistry reactions. Global OH has been monitored by satellites with the traditional limb mode in the past decades. This observed mode can achieve the acquisition of high-resolution vertical OH data but cannot obtain enough horizontal OH data for inverting high-precision OH concentrations because OH has a high reactivity that makes OH concentrations extremely low and distributions complicated. The double spatial heterodyne spectrometer (DSHS) is designed to obtain higher-resolution and more detailed OH data. This sensor can measure OH by the three-dimensional limb mode to obtain comprehensive OH data in the atmosphere. Here we propose a new tomographic retrieval algorithm based on the simulated observation data because the DSHS will work officially on the orbit in the future. We build up an accurate forward model. The main part of it is the SCIATRAN radiative transfer model which is modified according to the radiation transmission theory. The error in results obtained by the forward model is ±44.30 % in the lower atmosphere such as at a 21 km height and decreases gradually until the limit of observation altitude. We also construct the tomographic retrieval algorithm of which the core is a lookup table method. A tomographic-observation database is built up through the atmospheric model, the spatial information (the position of the target area and satellite position), the date parameters, the observation geometries, OH concentrations, and simulated observation data. The OH concentrations can be found from it directly. If there are no corresponding query conditions in the tomographic-observation database, the cubic spline interpolation is used to obtain the OH concentrations. The inversion results are given, and the errors in them increase as the altitudes rise until about a 41 km height then start to decrease. The errors in the inversion results reach the maximum of about ±25.03 % at the 41 km height and decrease to ±8.09 % at the limited observation height. They are also small in the lower atmosphere at ±12.96 % at 21 km. In summary, the tomographic retrieval algorithm can obtain more accurate OH concentrations even in the lower atmosphere where the OH data are not high quality and avoids the setting of initial guess values for solving the iteration problems. Our research not only provides support for the scientific theory of the construction of the DSHS but also gives a new retrieval algorithm idea for other radicals.

show abstract

Section: Discussionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Tomographic retrieval algorithm of OH concentration profiles using double spatial heterodyne spectrometers

Gao

et al. 2020

Atmos. Meas. Tech.

View full text Add to dashboard Cite

show abstract

“…Wang used the average orthogonal fitting method to handle with the MLS data for obtaining the OH concentrations, and compared the results with the ground-based FTUVS results in some areas. They matched very well (Wang et al, 2008). Damiani handled the MLS data of nighttime winter in the northern hemisphere from the latitude of 75° to 82° by regional mean method to research the change of OH concentrations in short-term (day) https://doi.org/10.5194/amt-2019-485 Preprint.…”

Section: Introductionmentioning

confidence: 72%

“…In addition, the 14 CO oxidation method, the Scrubbing using the salicylic acid Technique and the Spin Trapping method are used to obtain the OH concentrations in the laboratory for some theoretical researches (Felton et al, 1990;Salmon et al, 2004;Watanabe et al, 1982). Apart from the six physical and chemical methods mentioned above, many researchers used the high-precision spectrum data from the ground-based instruments especially the Fourier Transform Ultraviolet Spectrometer (FTUVS) in the Table Mountain (Cageao et al, 2001;Cheung et al, 2008;Mills et al, 2002). These methods are restricted by the features of the instruments which can provide accurate OH data in the limited lower atmosphere but are difficult to provide enough data for inverting OH concentrations from mesopause to tropopause.…”

Section: Introductionmentioning

confidence: 99%

Tomographic retrieval algorithm of OH concentration profiles using Double Spatial Heterodyne Spectrometers

An¹,

José²,

Gao³

et al. 2020

Preprint

View full text Add to dashboard Cite

Abstract. The hydroxyl radical (OH) determines the atmospheric self-cleaning capability and is one of the significant oxidants in atmospheric photochemistry reactions. The global OH has been monitored by satellites with the traditional limb mode in the past decades. This observed mode can achieve high-resolution vertical OH data, but cannot obtain the enough horizontal OH data for inverting high-precision OH concentrations because OH has the high reactivity that makes its concentrations extremely low and distributions complicated. The Double Spatial Heterodyne Spectrometers (DSHS) is designed in order to achieve more high-resolution and detailed OH data. This sensor can measure the OH by the three-dimensional limb mode to obtain the comprehensive OH data in the atmosphere. We propose a new tomographic retrieval algorithm here based on the simulated observation data due to the DSHS will work officially on the orbit in the future. We build up an accurate forward model that the main part of it is the SCIATRAN radiative transfer model which is modified according to the radiation transmission theory. We also construct the tomographic retrieval algorithm that the core is a look up table method. A tomographic observed database is built up through the atmospheric model, the spatial information (position of the target area and satellite position), the date parameters, the observation geometries, OH concentrations and simulated observation data. The OH concentrations can be found directly from it. If there are no corresponding query conditions in the tomographic observed database, the cubic spline interpolation is used to obtain the OH concentrations. The tomographic retrieval algorithm can obtain the more accurate OH concentrations even in the lower atmosphere where the OH data is not well and avoids the initial guess values for solving the iteration problems. Our research not only provides a scientific theory support for the construction of DSHS, but also gives a new retrieval algorithm idea for other radicals.

show abstract

“…The JPL FTUVS has been measuring the vertical column abundance of trace species over TMF under clear to lightly cloudy sky conditions since 1997 [ Cageao et al , 2001; Li et al , 2005; Mills et al , 2002; Wang et al , 2008; Cheung et al , 2008; Pongetti et al, manuscript in preparation, 2010]. NO 2 measurements started in 2005.…”

Section: Direct Sun No2 Measurement Techniquesmentioning

confidence: 99%

Direct Sun measurements of NO₂ column abundances from Table Mountain, California: Intercomparison of low‐ and high‐resolution spectrometers

Wang¹,

Pongetti²,

Sander³

et al. 2010

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

[1] The NO 2 total column abundance, C NO 2 , was measured with a direct Sun viewing technique using three different instruments at NASA Jet Propulsion Laboratory's (JPL) Table Mountain Facility in California during an instrument intercomparison campaign in July 2007. The instruments are a high-resolution (∼0.001 nm) Fourier transform ultraviolet spectrometer (FTUVS) from JPL and two moderate-resolution grating spectrometers, multifunction differential optical absorption spectroscopy (MF-DOAS) (∼0.8 nm) from Washington State University and Pandora (∼0.4 nm) from NASA Goddard Space Flight Center. FTUVS uses high spectral resolution to determine the absolute NO 2 column abundance independently from the exoatmospheric solar irradiance using rovibrational NO 2 absorption lines. The NO 2 total column is retrieved after removing the solar background using Doppler-shifted spectra from the east and west limbs of the Sun. The FTUVS measurements were used to validate the independently calibrated measurements of multifunction differential optical absorption spectroscopy (MF-DOAS) and Pandora. The latter two instruments start with measured high-Sun spectra as solar references to retrieve relative NO 2 columns and then apply modified Langley or "bootstrap" methods to determine the amounts of NO 2 in the references to obtain the absolute NO 2 columns. The calibration offset derived from the FTUVS measurements is consistent with the values derived from Langley and bootstrap calibration plots of the NO 2 slant column measured by the grating spectrometers. The calibrated total vertical column abundances of NO 2 , C NO 2 , from all three instruments are compared showing that MF-DOAS and Pandora data agree well with each other, and both data sets agree with FTUVS data to within (1.5 ± 4.1)% and (6.0 ± 6.0)%, respectively.

show abstract

Atmospheric hydroxyl radical (OH) abundances from ground-based ultraviolet solar spectra: an improved retrieval method

Cited by 7 publications

References 31 publications

Tomographic retrieval algorithm of OH concentration profiles using double spatial heterodyne spectrometers

Tomographic retrieval algorithm of OH concentration profiles using double spatial heterodyne spectrometers

Tomographic retrieval algorithm of OH concentration profiles using Double Spatial Heterodyne Spectrometers

Direct Sun measurements of NO₂ column abundances from Table Mountain, California: Intercomparison of low‐ and high‐resolution spectrometers

Contact Info

Product

Resources

About

Atmospheric hydroxyl radical (OH) abundances from ground-based ultraviolet solar spectra: an improved retrieval method

Cited by 7 publications

References 31 publications

Tomographic retrieval algorithm of OH concentration profiles using double spatial heterodyne spectrometers

Tomographic retrieval algorithm of OH concentration profiles using double spatial heterodyne spectrometers

Tomographic retrieval algorithm of OH concentration profiles using Double Spatial Heterodyne Spectrometers

Direct Sun measurements of NO2 column abundances from Table Mountain, California: Intercomparison of low‐ and high‐resolution spectrometers

Contact Info

Product

Resources

About

Direct Sun measurements of NO₂ column abundances from Table Mountain, California: Intercomparison of low‐ and high‐resolution spectrometers