the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
| 01 Nov 2023
A multi-decadal time series of upper stratospheric temperature profiles from Odin-OSIRIS limb scattered spectra
Abstract.
A new upper stratospheric (35–60 km) temperature data product has been produced using Optical Spectrograph and InfraRed Imager System (OSIRIS) limb scattered spectra that now spans over 22 years. Temperature is calculated by first estimating the Rayleigh scatter signal, and then integrating hydrostatic balance combined with the ideal gas law. Uncertainties are estimated to be 1–5 K, with a vertical resolution of 3–4 km. Correlative comparisons with the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) and the Microwave Limb Sounder (MLS) are consistent with these uncertainty estimates, and generally have no regions of statistically significant drift. The data product has been publicly released as part of the nominal OSIRIS v7.3 processing.
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Notice on discussion status
The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.
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Preprint
(4212 KB)
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.
- Preprint
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- Final revised paper
Journal article(s) based on this preprint
Interactive discussion
Status: closed
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RC1: 'Comment on egusphere-2023-2264', Anonymous Referee #1, 30 Nov 2023
Review of the manuscript egusphere-2023-2264 “A multi-decadal time series of upper stratospheric temperature profiles from Odin-OSIRIS limb scattered spectra” by Zawada et al.
This article presents a study on the determination of the temperature of the upper stratosphere from observations of Rayleigh scattering at the limb of the Earth's atmosphere. There is little data on the temperature in this region, which is very sensitive to climate change, and the technique of measuring Rayleigh scattering at the limb is very promising as a complement to existing techniques based on observations of atmospheric radiance in the infrared or microwave spectrum. This article makes a valuable contribution to the subject with a careful analysis of performance and error budget using Odin-OSIRIS data. I recommend its publication on EGUsphere after a minor revision detailed below.
Section 2, lines 52-55: the downward measurements are taken at around 06:00 local time, also close to dawn or dusk. Could you explain why the geometric configuration is better for observations of the bright limb in the morning part of the orbit? Is it to do with the direction of pointing in relation to the plane of the orbit? This is probably linked to the solar zenith angle (SZA) at the tangent point. Information on the SZA as a function of latitude and season is lacking for a better understanding of the observation conditions.
Section 4.1: This section describes the absolute calibration effect. It is not clear to me why the absolute calibration correction has an impact on the recovered temperature. This is obtained using a comparison with SASKTRAN simulations used as a black box, but it would be interesting to know what the physical reason is. Is it related to the estimation of the multiple scattering contribution to the radiance?
Section 4.4, lines 275-279: Is it not possible to develop an algorithm to filter the radiance profiles contaminated by PMCs and keep the non-contaminated profiles in the database?
Section 5.3, Seasonal cycle: It is difficult to understand the seasonal evolution of temperature differences between satellites from Figure 11 showing the absolute temperature for each data set. It would be useful to show the seasonal cycle of these temperature differences directly.
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AC1: 'Reply on RC1', Daniel Zawada, 26 Jan 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2264/egusphere-2023-2264-AC1-supplement.pdf
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AC1: 'Reply on RC1', Daniel Zawada, 26 Jan 2024
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RC2: 'Comment on egusphere-2023-2264', Anonymous Referee #2, 19 Dec 2023
The hits keep coming, another new product from the OSIRIS team – middle atmosphere temperature profile derived from passive measurements of limb scattering UV sunlight, albeit over a limited altitude range ~30-60 km. The analysis method is fairly complete and makes use of the team’s expertise with radiative transfer, but the authors need to supply more information about the character of the absolute calibration. The authors should consider an associated pressure profile to include with the temperature profile described here.
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AC2: 'Reply on RC2', Daniel Zawada, 26 Jan 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2264/egusphere-2023-2264-AC2-supplement.pdf
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AC2: 'Reply on RC2', Daniel Zawada, 26 Jan 2024
Interactive discussion
Status: closed
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RC1: 'Comment on egusphere-2023-2264', Anonymous Referee #1, 30 Nov 2023
Review of the manuscript egusphere-2023-2264 “A multi-decadal time series of upper stratospheric temperature profiles from Odin-OSIRIS limb scattered spectra” by Zawada et al.
This article presents a study on the determination of the temperature of the upper stratosphere from observations of Rayleigh scattering at the limb of the Earth's atmosphere. There is little data on the temperature in this region, which is very sensitive to climate change, and the technique of measuring Rayleigh scattering at the limb is very promising as a complement to existing techniques based on observations of atmospheric radiance in the infrared or microwave spectrum. This article makes a valuable contribution to the subject with a careful analysis of performance and error budget using Odin-OSIRIS data. I recommend its publication on EGUsphere after a minor revision detailed below.
Section 2, lines 52-55: the downward measurements are taken at around 06:00 local time, also close to dawn or dusk. Could you explain why the geometric configuration is better for observations of the bright limb in the morning part of the orbit? Is it to do with the direction of pointing in relation to the plane of the orbit? This is probably linked to the solar zenith angle (SZA) at the tangent point. Information on the SZA as a function of latitude and season is lacking for a better understanding of the observation conditions.
Section 4.1: This section describes the absolute calibration effect. It is not clear to me why the absolute calibration correction has an impact on the recovered temperature. This is obtained using a comparison with SASKTRAN simulations used as a black box, but it would be interesting to know what the physical reason is. Is it related to the estimation of the multiple scattering contribution to the radiance?
Section 4.4, lines 275-279: Is it not possible to develop an algorithm to filter the radiance profiles contaminated by PMCs and keep the non-contaminated profiles in the database?
Section 5.3, Seasonal cycle: It is difficult to understand the seasonal evolution of temperature differences between satellites from Figure 11 showing the absolute temperature for each data set. It would be useful to show the seasonal cycle of these temperature differences directly.
-
AC1: 'Reply on RC1', Daniel Zawada, 26 Jan 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2264/egusphere-2023-2264-AC1-supplement.pdf
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AC1: 'Reply on RC1', Daniel Zawada, 26 Jan 2024
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RC2: 'Comment on egusphere-2023-2264', Anonymous Referee #2, 19 Dec 2023
The hits keep coming, another new product from the OSIRIS team – middle atmosphere temperature profile derived from passive measurements of limb scattering UV sunlight, albeit over a limited altitude range ~30-60 km. The analysis method is fairly complete and makes use of the team’s expertise with radiative transfer, but the authors need to supply more information about the character of the absolute calibration. The authors should consider an associated pressure profile to include with the temperature profile described here.
-
AC2: 'Reply on RC2', Daniel Zawada, 26 Jan 2024
The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2264/egusphere-2023-2264-AC2-supplement.pdf
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AC2: 'Reply on RC2', Daniel Zawada, 26 Jan 2024
Peer review completion
Journal article(s) based on this preprint
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Daniel J. Zawada
Kimberlee Robyn Dubé
Taran W. Warnock
Adam Edward Bourassa
Susann Tegtmeier
Douglas A. Degenstein
The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.
- Preprint
(4212 KB) - Metadata XML