the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Martian column CO2 and pressure measurement with differential absorption lidar at 1.96 µm
Abstract. By utilizing progress in millijoule-level pulsed fiber lasers operating in the 1.96 µm spectral range, we introduce a concept utilizing a differential absorption barometric lidar designed to operate within the 1.96 µm CO2 absorption band for remote sensing of Martian atmospheric properties. Our focus is on the online wavelength situated in the trough region of two absorption lines, selected due to its insensitivity to laser frequency variations, thus mitigating the necessity for stringent laser frequency stability. Our investigation revolves around a compact lidar configuration, featuring reduced telescope dimensions and lower laser pulse energies. These adjustments are geared towards minimizing costs for potential forthcoming Mars missions. The core measurement objectives encompass the determination of column CO2 absorption optical depth, columnar CO2 abundance, surface air pressure, as well as vertical distributions of dust and cloud layers. Through the amalgamation of surface pressure data with atmospheric temperature insights garnered from sounders and utilizing the barometric formula, the prospect of deducing atmospheric pressure profiles becomes feasible. Simulation studies validate the viability of our approach. Notably, the precision of Martian surface pressure measurements is projected to surpass 1 Pa when the aerial dust optical depth is projected to be under 0.7, a typical air borne dust scenario on Mars, considering a horizontal averaging span of 10 km.
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RC1: 'Comment on amt-2023-180', Anonymous Referee #1, 10 Dec 2023
Review of “Martian column CO2 and pressure measurement with differential absorption lidar at 1.96 μm”
General comments:
This study introduced a design of lidar to retrieve Martian column CO2 and pressure profiles. Compared with previous study, the main innovation is compact lidar configuration with small telescope dimensions and low laser pulse energies using the 1.96 μm CO2 absorption band. Online and offline bands around 1.96 μm are selected to formulate a differential absorption optical depth algorithm. Finally, the authors conducted an OSSE experiment to estimate retrieval uncertainties. When the design is implemented, retrieved data should be useful for Martian reseraches. The manuscript is well written.
Specific comments:
- In Fig. 2, temperature data is not well fitted. Is the fitted temperature curve used for calculation in Fig.3? If so, how it affects CO2 absorption optical depth in Fig. 3?
Technical correction:
Lines 305 and 321: 2 should be subscript in CO2.
Citation: https://doi.org/10.5194/amt-2023-180-RC1 -
AC1: 'Reply on RC1', Zhaoyan Liu, 10 Jan 2024
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-180/amt-2023-180-AC1-supplement.pdf
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RC2: 'Comment on amt-2023-180', Anonymous Referee #2, 10 Dec 2023
-
AC2: 'Reply on RC2', Zhaoyan Liu, 10 Jan 2024
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-180/amt-2023-180-AC2-supplement.pdf
-
AC2: 'Reply on RC2', Zhaoyan Liu, 10 Jan 2024
Status: closed
-
RC1: 'Comment on amt-2023-180', Anonymous Referee #1, 10 Dec 2023
Review of “Martian column CO2 and pressure measurement with differential absorption lidar at 1.96 μm”
General comments:
This study introduced a design of lidar to retrieve Martian column CO2 and pressure profiles. Compared with previous study, the main innovation is compact lidar configuration with small telescope dimensions and low laser pulse energies using the 1.96 μm CO2 absorption band. Online and offline bands around 1.96 μm are selected to formulate a differential absorption optical depth algorithm. Finally, the authors conducted an OSSE experiment to estimate retrieval uncertainties. When the design is implemented, retrieved data should be useful for Martian reseraches. The manuscript is well written.
Specific comments:
- In Fig. 2, temperature data is not well fitted. Is the fitted temperature curve used for calculation in Fig.3? If so, how it affects CO2 absorption optical depth in Fig. 3?
Technical correction:
Lines 305 and 321: 2 should be subscript in CO2.
Citation: https://doi.org/10.5194/amt-2023-180-RC1 -
AC1: 'Reply on RC1', Zhaoyan Liu, 10 Jan 2024
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-180/amt-2023-180-AC1-supplement.pdf
-
RC2: 'Comment on amt-2023-180', Anonymous Referee #2, 10 Dec 2023
-
AC2: 'Reply on RC2', Zhaoyan Liu, 10 Jan 2024
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-180/amt-2023-180-AC2-supplement.pdf
-
AC2: 'Reply on RC2', Zhaoyan Liu, 10 Jan 2024
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