60-GHz oxygen band: precise broadening and central frequencies of fine-structure lines, absolute absorption profile at atmospheric pressure, and revision of mixing coefficients

Tretyakov, M.Yu.; Koshelev, М.А.; Dorovskikh, V. V.; Makarov, D. S.; Rosenkranz, P. W.

doi:10.1016/j.jms.2004.11.011

Cited by 102 publications

(66 citation statements)

References 24 publications

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“…For the calculation of the opacity, the Van-Vleck-Weisskopf function (1947) was used as the line profile function for H 2 O and O 2 . Spectroscopic line parameters for H 2 O were taken from the HITRAN 2012 database (Rothman et al 2013), whereas those for O 2 were taken from the line parameter files provided by Atmospheric and Environmental Research, Inc (AER: http://rtweb.aer.com/), which include first-order line-mixing coefficients at four specific temperatures (Tretyakov et al 2005). Continuum absorptions due to H 2 O were calculated using version 2.5.2 of the MT CKD continuum model (Mlawer et al 2012) from the AER.…”

Section: Data Correctionsmentioning

confidence: 99%

Observations of stratospheric and mesospheric O3 with a millimeter-wave radiometer at Rikubetsu, Japan

et al. 2016

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We have been measuring brightness temperature spectra of the atmospheric ozone (O 3 ) emission at 110.83 GHz with a millimeter-wave radiometer (MWR) located at Rikubetsu, Japan, since November 1999. Tropospheric opacities, which were also measured with the MWR and were used to take into account attenuation of the O 3 signal from the stratosphere and mesosphere, were corrected using the tropospheric opacity calculated from radiosonde data. Temporal variations of the measured spectral intensity of O 3 , likely due to degradations of the superconductor-insulator-superconductor receiver and of the vessel for cold calibration load, were also corrected using scaling factors derived from ozonesonde data up to an average height of 35 km and Microwave Limb Sounder (MLS) monthly mean climatology above the sonde height. The vertical profiles of the O 3 mixing ratio in the altitude range from 24 to 56 km were retrieved from the spectra with the optimal estimation approach. The retrieval errors from uncertainties in the scaling factor, the corrected tropospheric opacity, and atmospheric temperature, as well as those from spectral noise, were evaluated, and we found that the main retrieval errors resulted from uncertainties in the scaling factor and tropospheric opacity. The retrieved O 3 profiles were compared with those from the Solar Backscatter Ultraviolet (SBUV/2), the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), and the MLS instruments onboard satellites. The retrieved O 3 mixing ratios at individual levels agreed with the MLS version 3.3 or 3.4 data with an average difference better than ±5 % and a standard deviation of 4-9 %. Additionally, the retrieved O 3 profiles were in reasonable agreement with the SABER version 2.0 O 3 profiles and the SBUV/2 version 8.6 O 3 profiles, in line with the validation results of their satellite data in the earlier literature.

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Section: Data Correctionsmentioning

confidence: 99%

Observations of stratospheric and mesospheric O3 with a millimeter-wave radiometer at Rikubetsu, Japan

et al. 2016

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“…The other differences in rms do not exceed 0.08 K. Such close results indicate that in spite of different complexity (Liebe87 model accounts for 48 oxygen lines and Tret05-only for 40 lines) and different types of temperature and pressure oxygen coefficient dependence both models lead to identical results. Moreover, Tret05 model was extensively validated for a wide range of temperatures [70] whereas Liebe87 model was validated only for positive temperatures. The fact that the data set used in the study is featured by lower temperatures due to the polar station source did not influence Liebe87 model performance.…”

Section: Resultsmentioning

confidence: 99%

An Updated Geophysical Model for AMSR-E and SSMIS Brightness Temperature Simulations over Oceans

2014

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Abstract:In this study, we considered the geophysical model for microwave brightness temperature (BT) simulation for the Atmosphere-Ocean System under non-precipitating conditions. The model is presented as a combination of atmospheric absorption and ocean emission models. We validated this model for two satellite instruments-for Advanced Microwave Sounding Radiometer-Earth Observing System (AMSR-E) onboard Aqua satellite and for Special Sensor Microwave Imager/Sounder (SSMIS) onboard F16 satellite of Defense Meteorological Satellite Program (DMSP) series. We compared simulated BT values with satellite BT measurements for different combinations of various water vapor and oxygen absorption models and wind induced ocean emission models. A dataset of clear sky atmospheric and oceanic parameters, collocated in time and space with satellite measurements, was used for the comparison. We found the best model combination, providing the least root mean square error between calculations and measurements. A single combination of models ensured the best results for all considered radiometric channels. We also obtained the adjustments to simulated BT values, as averaged differences between the model simulations and satellite measurements. These adjustments can be used in any research based on modeling data for removing model/calibration inconsistencies. We demonstrated the application of the model by means of the development of the new algorithm for sea surface wind speed retrieval from AMSR-E data.

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“…The footprint size at the surface varies with channel; for a flight altitude of 10 km it varies between 700 and 1500 m. Within ARTS, gas absorption was taken into account by using the HITRAN database (Rothman et al, 2013) and the MT_CKD model for the continuum absorption of water vapor and molecular nitrogen in version 2.52 (Mlawer et al, 2012). The gas absorption of molecular oxygen was processed by using the full absorption model of Rosenkranz (1998) modified by the values from Tretyakov et al (2005). The surface emissivity was calculated using the FAST microwave Emissivity Model (FASTEM; Liu et al, 2011) implementation within ARTS 2.3 using the surface wind speed and surface temperature from the ICON model dataset.…”

Section: Radiative Transfer Simulationsmentioning

confidence: 99%

Retrieval of an ice water path over the ocean from ISMAR and MARSS millimeter and submillimeter brightness temperatures

Brath¹,

Fox

Eriksson

et al. 2018

Atmos. Meas. Tech.

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Abstract. A neural-network-based retrieval method to determine the snow ice water path (SIWP), liquid water path (LWP), and integrated water vapor (IWV) from millimeter and submillimeter brightness temperatures, measured by using airborne radiometers (ISMAR and MARSS), is presented. The neural networks were trained by using atmospheric profiles from the ICON numerical weather prediction (NWP) model and by radiative transfer simulations using the Atmospheric Radiative Transfer Simulator (ARTS). The basic performance of the retrieval method was analyzed in terms of offset (bias) and the median fractional error (MFE), and the benefit of using submillimeter channels was studied in comparison to pure microwave retrievals. The retrieval is offset-free for SIWP > 0.01 kg m to 30 % at LWP = 1 kg m −2 . The MFE of IWV for IWV > 3 kg m −2 is 5 to 8 %. The SIWP retrieval strongly benefits from submillimeter channels, which reduce the MFE by a factor of 2, compared to pure microwave retrievals. The IWV and the LWP retrievals also benefit from submillimeter channels, albeit to a lesser degree. The retrieval was applied to ISMAR and MARSS brightness temperatures from FAAM flight B897 on 18 March 2015 of a precipitating frontal system west of the coast of Iceland. Considering the given uncertainties, the retrieval is in reasonable agreement with the SIWP, LWP, and IWV values simulated by the ICON NWP model for that flight. A comparison of the retrieved IWV with IWV from 12 dropsonde measurements shows an offset of 0.5 kg m −2 and an RMS difference of 0.8 kg m −2 , showing that the retrieval of IWV is highly effective even under cloudy conditions.

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60-GHz oxygen band: precise broadening and central frequencies of fine-structure lines, absolute absorption profile at atmospheric pressure, and revision of mixing coefficients

Cited by 102 publications

References 24 publications

Observations of stratospheric and mesospheric O3 with a millimeter-wave radiometer at Rikubetsu, Japan

Observations of stratospheric and mesospheric O3 with a millimeter-wave radiometer at Rikubetsu, Japan

An Updated Geophysical Model for AMSR-E and SSMIS Brightness Temperature Simulations over Oceans

Retrieval of an ice water path over the ocean from ISMAR and MARSS millimeter and submillimeter brightness temperatures

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