Malina Edward, Muller Jan-Peter, Walton David
Formerly at Imaging Group, Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK.
UCL Open Environ. 2021 Feb 10;3:e013. doi: 10.14324/111.444/ucloe.000013. eCollection 2021.
Measurements of methane isotopologues can differentiate between different source types, be they biogenic (e.g. marsh lands) or abiogenic (e.g. industry). Global measurements of these isotopologues would greatly benefit the current disconnect between 'top-down' (knowledge from chemistry transport models and satellite measurements) and 'bottom-up' ( measurement inventories) methane measurements. However, current measurements of these isotopologues are limited to a small number of studies and airborne studies. In this paper we investigate the potential for detecting the second most common isotopologue of methane (CH) from space using the Japanese Greenhouse Gases Observing Satellite applying a quick and simple residual radiance analysis technique. The method allows for a rapid analysis of spectral regions, and can be used to teach university students or advanced school students about radiative transfer analysis. Using this method we find limited sensitivity to CH, with detections limited to total column methane enhancements of >6%, assuming a desert surface albedo of >0.3.
甲烷同位素异构体的测量可以区分不同的源类型，无论是生物源（如沼泽地）还是非生物源（如工业）。对这些同位素异构体进行全球测量将极大地改善目前“自上而下”（来自化学传输模型和卫星测量的知识）和“自下而上”（测量清单）甲烷测量之间的脱节情况。然而，目前对这些同位素异构体的测量仅限于少数研究和机载研究。在本文中，我们利用日本温室气体观测卫星，采用快速简单的剩余辐射分析技术，研究了从太空探测甲烷的第二常见同位素异构体（CH）的潜力。该方法能够对光谱区域进行快速分析，可用于教授大学生或高中生辐射传输分析。使用这种方法，我们发现对CH的灵敏度有限，假设沙漠表面反照率大于0.3，检测限于总柱甲烷增强大于6%的情况。
