气候变化领域集成服务门户(CCPortal): Using a portable FTIR spectrometer to evaluate the consistency of Total Carbon Column Observing Network (TCCON) measurements on a global scale: the Collaborative Carbon Column Observing Network (COCCON) travel standard

CCPortal

DOI	10.5194/amt-17-3467-2024
	Using a portable FTIR spectrometer to evaluate the consistency of Total Carbon Column Observing Network (TCCON) measurements on a global scale: the Collaborative Carbon Column Observing Network (COCCON) travel standard
	Herkommer, Benedikt; Alberti, Carlos; Castracane, Paolo; Chen, Jia; Dehn, Angelika; Dietrich, Florian; Deutscher, Nicholas M.; Frey, Matthias Max; Gross, Jochen; Gillespie, Lawson; Hase, Frank; Morino, Isamu; Pak, Nasrin Mostafavi; Walker, Brittany; Wunch, Debra
发表日期	2024
ISSN	1867-1381
EISSN	1867-8548
起始页码	17
结束页码	11
卷号	17 期号:11
英文摘要	To fight climate change, it is crucial to have a precise knowledge of greenhouse gas (GHG) concentrations in the atmosphere and to monitor sources and sinks of GHGs. On global scales, satellites are an appropriate monitoring tool. For the validation of the satellite measurements and to tie them to the World Meteorological Organization (WMO) trace gas scale, ground-based Fourier transform infrared (FTIR) networks are used, which provide reference data. To ensure the highest-quality validation data, the network must be scaled to the WMO trace gas scale and have a very small site-to-site bias. Currently, the Total Carbon Column Observing Network (TCCON) is the de facto standard FTIR network for providing reference data. Ensuring a small site-to-site bias is a major challenge for the TCCON. In this work, we describe the development and application of a new method to evaluate the site-to-site bias by using a remotely controlled portable FTIR spectrometer as a travel standard (TS) for evaluating the consistency of columnar GHG measurements performed at different TCCON stations, and we describe campaign results for the TCCON sites in Tsukuba (Japan), East Trout Lake (Canada) and Wollongong (Australia). The TS is based on a characterized portable EM27/SUN FTIR spectrometer equipped with an accurate pressure sensor which is operated in an automated enclosure. The EM27/SUN is the standard instrument of the Collaborative Carbon Column Observing Network (COCCON). The COCCON is designed such that all spectrometers are referenced to a common reference unit located in Karlsruhe, Germany. To evaluate the long-term stability of the TS instrument, it is placed side-by-side with the TCCON instrument in Karlsruhe (KA) and the COCCON reference unit (the EM27/SUN spectrometer SN37, which is operated permanently next to the TCCON-KA site) between deployments to collect comparing measurements.At each of the visited TCCON sites, the TCCON spectrometers collected low-resolution (LR) (0.5 cm - 1 ) and high-resolution (HR) (0.02 cm - 1 ) measurements in an alternating manner. Based on the TS as a portable standard, the measurements are compared to the Karlsruhe site as a common reference. For Tsukuba and Wollongong, the agreement with the reference in Karlsruhe found for XCO 2 is on the 0.1 % level for both the LR and HR measurements. For XCH 4 , the agreement is at the 0.2 % level, with the low-resolution measurements showing a low bias at both sites and for both gases. For XCO , the deviations are up to 7 %. The reason for this is likely to be a known issue with the CO a priori profiles used by the TCCON over source regions. In East Trout Lake (ETL), the TCCON spectrometer broke down while the TS was en route to the station. Hence, no side-by-side comparison was possible there.An important auxiliary value for FTIR retrievals is the surface pressure. Using the pressure sensor in the TS, the surface pressure measurements at each site are also compared. The surface pressure analysis reveals excellent agreement (0.027, 0.135 and 0.094 hPa ) for the Tsukuba, ETL and Wollongong sites.
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001238673700001
来源期刊	ATMOSPHERIC MEASUREMENT TECHNIQUES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306700
作者单位	Helmholtz Association; Karlsruhe Institute of Technology; National Institute for Environmental Studies - Japan; University of Toronto; Technical University of Munich; University of Wollongong; European Space Agency; Helmholtz Association; Karlsruhe Institute of Technology
推荐引用方式 GB/T 7714	Herkommer, Benedikt,Alberti, Carlos,Castracane, Paolo,et al. Using a portable FTIR spectrometer to evaluate the consistency of Total Carbon Column Observing Network (TCCON) measurements on a global scale: the Collaborative Carbon Column Observing Network (COCCON) travel standard[J],2024,17(11).
APA	Herkommer, Benedikt.,Alberti, Carlos.,Castracane, Paolo.,Chen, Jia.,Dehn, Angelika.,...&Wunch, Debra.(2024).Using a portable FTIR spectrometer to evaluate the consistency of Total Carbon Column Observing Network (TCCON) measurements on a global scale: the Collaborative Carbon Column Observing Network (COCCON) travel standard.ATMOSPHERIC MEASUREMENT TECHNIQUES,17(11).
MLA	Herkommer, Benedikt,et al."Using a portable FTIR spectrometer to evaluate the consistency of Total Carbon Column Observing Network (TCCON) measurements on a global scale: the Collaborative Carbon Column Observing Network (COCCON) travel standard".ATMOSPHERIC MEASUREMENT TECHNIQUES 17.11(2024).