Aerosol-Calibrated Matched Filter Method for Retrievals of Methane Point Source Emissions Over the Los Angeles Basin

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS Earth and Space Science Pub Date : 2024-08-05 DOI:10.1029/2024EA003519
Chenxi Feng, Sihe Chen, Zhao-Cheng Zeng, Yangcheng Luo, Vijay Natraj, Yuk L. Yung
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Abstract

Methane, with a global warming potential roughly 86 times greater than carbon dioxide over a 20-year timeframe, plays a crucial role in global warming. Remote sensing retrieval is a pivotal methodology for identifying methane emission sources, with accuracy influenced largely by surface and atmospheric properties, including aerosols. In this study, we propose an Aerosol-Calibrated Matched Filter (ACMF) algorithm to improve the traditional Matched Filter (MF) method. Our new approach incorporates an aerosol scattering correction factor to reduce the aerosol-induced bias on methane retrievals. Validating our algorithm through simulated spectra, we demonstrate that considering the aerosol scattering effect significantly reduces retrieval errors compared to MF methods by an average of approximately 90%. We apply our newly developed algorithm to hyperspectral data obtained from the Airborne Visible/Infrared Imaging Spectrometer—Next Generation in the Los Angeles Basin and focus on 11 plumes identified through case studies. Our results reveal that ACMF estimates of emission rates and inversion uncertainties exhibit an average reduction of approximately 4% compared to corresponding MF results, with deviation increasing with aerosol optical depth (AOD).

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气溶胶校准匹配滤波法用于检索洛杉矶盆地上空的甲烷点源排放量
甲烷的全球变暖潜能值在 20 年内大约是二氧化碳的 86 倍,在全球变暖中起着至关重要的作用。遥感检索是确定甲烷排放源的关键方法,其准确性在很大程度上受地表和大气特性(包括气溶胶)的影响。在这项研究中,我们提出了一种气溶胶校准匹配滤波(ACMF)算法,以改进传统的匹配滤波(MF)方法。我们的新方法纳入了气溶胶散射校正因子,以减少气溶胶引起的甲烷检索偏差。我们通过模拟光谱验证了我们的算法,结果表明,与 MF 方法相比,考虑气溶胶散射效应可显著降低检索误差,平均降低约 90%。我们将新开发的算法应用于下一代机载可见光/红外成像光谱仪在洛杉矶盆地获得的高光谱数据,并重点关注通过案例研究确定的 11 个羽流。我们的结果表明,与相应的 MF 结果相比,ACMF 估算的排放率和反演不确定性平均降低了约 4%,偏差随气溶胶光学深度(AOD)的增加而增大。
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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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