Performance evaluation of spaceborne combined IPDA LIDAR and DIAL for simultaneous measurement of methane column concentrations and water vapor density profile

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-04-05 DOI:10.1007/s00340-025-08460-9

Zitong Wu, Cheng Chen, Chuncan Fan, Xiaopeng Zhu, Jiqiao Liu, Weibiao Chen

{"title":"Performance evaluation of spaceborne combined IPDA LIDAR and DIAL for simultaneous measurement of methane column concentrations and water vapor density profile","authors":"Zitong Wu, Cheng Chen, Chuncan Fan, Xiaopeng Zhu, Jiqiao Liu, Weibiao Chen","doi":"10.1007/s00340-025-08460-9","DOIUrl":null,"url":null,"abstract":"<div>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.</div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 5","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics B","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s00340-025-08460-9","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"OPTICS","Score":null,"Total":0}

引用次数: 0

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.

查看原文本刊更多论文

星载IPDA激光雷达与DIAL同步测量甲烷柱浓度和水蒸气密度剖面的性能评价

甲烷（CH4）是最重要的温室气体之一，由于其排放量的增加，其对气候变化的影响正在逐渐增强。水蒸气（H2O）是影响气象、气候和全球水文循环的重要因素。对流层低层H2O的分布在研究温室效应增强、天气预报等方面具有重要作用。基于甲烷1645 nm吸收谱线与H2O 822 nm吸收谱线在倍频后重合的特点，提出了一种双组分探测差分吸收光探测测距（LIDAR）方法。该系统利用集成路径差分吸收（IPDA）原理检测CH4柱浓度，利用差分吸收激光雷达（DIAL）原理测量H2O浓度分布。该系统的激光源主要包括光参量振荡器（OPO）、光参量放大器（OPA）和二次谐波产生模块（SHG）。通过对频率稳定性、轮廓检测精度和激光源设计的综合分析，确定了CH4和H2O测量的最佳工作波长：CH4 online、offline1和offline2分别为1645.552 nm、1645.807 nm和1645.844 nm。基于所提出的激光雷达系统参数、吸收线参数以及表面反射率、气溶胶光学深度、地表高程等全局环境参数，对激光雷达CH4柱的全局测量性能进行了仿真分析。结果表明，当望远镜孔径为1000 mm，重复频率为25 Hz，发射能量为20 mJ，水平分辨率为50 km时，在94%的陆地面积上测量CH4的随机误差可小于7 ppb。随后，对LIDAR H2O垂直剖面测量结果进行了仿真分析。结果表明，在垂直分辨率为1 km、水平分辨率为100 km的条件下，6种典型大气模式对自由对流层H2O剖面浓度的反演精度可达到1 g/kg以内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.