Performance evaluation of spaceborne combined IPDA LIDAR and DIAL for simultaneous measurement of methane column concentrations and water vapor density profile.
Saved in:
| Title: | Performance evaluation of spaceborne combined IPDA LIDAR and DIAL for simultaneous measurement of methane column concentrations and water vapor density profile. |
|---|---|
| Authors: | Wu, Zitong1,2 (AUTHOR), Chen, Cheng1,2 (AUTHOR), Fan, Chuncan1,3 (AUTHOR), Zhu, Xiaopeng1 (AUTHOR), Liu, Jiqiao1,2,3 (AUTHOR) liujiqiao@siom.ac.cn, Chen, Weibiao1,2,3 (AUTHOR) |
| Source: | Applied Physics B: Lasers & Optics. May2025, Vol. 131 Issue 5, p1-18. 18p. |
| Subjects: | Differential absorption lidar, Optical parametric oscillators, Optical parametric amplifiers, LIDAR, Optical radar |
| Abstract: | Methane (CH4) is one of the most important greenhouse gases, and its impact on climate change is gradually increasing owing to increased emissions. Water vapor (H2O) is an important factor affecting meteorology, climate, and global hydrological cycles. The distribution of H2O in the lower troposphere plays a significant role in studying the enhancement of the greenhouse effect, weather forecasting, and other aspects. Based on the characteristics of the methane 1645 nm absorption line coinciding with the H2O 822 nm absorption line after frequency doubling, a dual-species detection differential absorption light detection and ranging (LIDAR) has been proposed. The system utilizes the principles of integrated path differential absorption (IPDA) to detect CH4 column concentrations and differential absorption LIDAR (DIAL) to measure the H2O concentration profile. The laser source of the system mainly includes optical parametric oscillator (OPO), optical parametric amplifier (OPA) and second harmonic generation module (SHG). By comprehensively analyzing the frequency stability, profile detection precision, and laser source design, the optimal operating wavelengths for CH4 and H2O measurements were presented: CH4 online, offline1, and offline2 were 1645.552 nm, 1645.807 nm and 1645.844 nm, respectively. Based on the proposed system parameters of the LIDAR, absorption line parameters, and global environmental parameters, such as surface reflectance, aerosol optical depth, and surface elevation, a simulation analysis of the global CH4 column measurement performance of the LIDAR was conducted. The results show that with a telescope aperture of 1000 mm, repetition rate of 25 Hz, emitting energy of 20 mJ and horizontal resolution of 50 km, the random error of the CH4 measurements can be below 7 ppb in 94% area of land. Subsequently, a simulation analysis of the LIDAR H2O vertical profile measurements was conducted. The results show that, with a vertical resolution of 1 km and a horizontal resolution of 100 km, the precision of the H2O profile concentration can reach within 1 g/kg in the free troposphere with six typical atmosphere models. [ABSTRACT FROM AUTHOR] |
| Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | Methane (CH4) is one of the most important greenhouse gases, and its impact on climate change is gradually increasing owing to increased emissions. Water vapor (H2O) is an important factor affecting meteorology, climate, and global hydrological cycles. The distribution of H2O in the lower troposphere plays a significant role in studying the enhancement of the greenhouse effect, weather forecasting, and other aspects. Based on the characteristics of the methane 1645 nm absorption line coinciding with the H2O 822 nm absorption line after frequency doubling, a dual-species detection differential absorption light detection and ranging (LIDAR) has been proposed. The system utilizes the principles of integrated path differential absorption (IPDA) to detect CH4 column concentrations and differential absorption LIDAR (DIAL) to measure the H2O concentration profile. The laser source of the system mainly includes optical parametric oscillator (OPO), optical parametric amplifier (OPA) and second harmonic generation module (SHG). By comprehensively analyzing the frequency stability, profile detection precision, and laser source design, the optimal operating wavelengths for CH4 and H2O measurements were presented: CH4 online, offline1, and offline2 were 1645.552 nm, 1645.807 nm and 1645.844 nm, respectively. Based on the proposed system parameters of the LIDAR, absorption line parameters, and global environmental parameters, such as surface reflectance, aerosol optical depth, and surface elevation, a simulation analysis of the global CH4 column measurement performance of the LIDAR was conducted. The results show that with a telescope aperture of 1000 mm, repetition rate of 25 Hz, emitting energy of 20 mJ and horizontal resolution of 50 km, the random error of the CH4 measurements can be below 7 ppb in 94% area of land. Subsequently, a simulation analysis of the LIDAR H2O vertical profile measurements was conducted. The results show that, with a vertical resolution of 1 km and a horizontal resolution of 100 km, the precision of the H2O profile concentration can reach within 1 g/kg in the free troposphere with six typical atmosphere models. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 09462171 |
| DOI: | 10.1007/s00340-025-08460-9 |
