气候变化领域集成服务门户(CCPortal): Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements

CCPortal

DOI	10.5194/acp-21-12561-2021
	Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements
	De Smedt I.; Pinardi G.; Vigouroux C.; Compernolle S.; Bais A.; Benavent N.; Boersma F.; Chan K.-L.; Donner S.; Eichmann K.-U.; Hedelt P.; Hendrick F.; Irie H.; Kumar V.; Lambert J.-C.; Langerock B.; Lerot C.; Liu C.; Loyola D.; Piters A.; Richter A.; Rivera Cárdenas C.; Romahn F.; Ryan R.G.; Sinha V.; Theys N.; Vlietinck J.; Wagner T.; Wang T.; Yu H.; Van Roozendael M.
发表日期	2021
ISSN	1680-7316
起始页码	12561
结束页码	12593
卷号	21 期号:16
英文摘要	The TROPOspheric Monitoring Instrument(TROPOMI), launched in October 2017 on board the Sentinel-5 Precursor (S5P) satellite, monitors the composition of the Earth's atmosphere at an unprecedented horizontal resolution as fine as 3.5×5.5 km2. This paper assesses the performances of the TROPOMI formaldehyde(HCHO) operational product compared to its predecessor, the OMI (Ozone Monitoring Instrument) HCHO QA4ECV product, at different spatial and temporal scales. The parallel development of the two algorithms favoured the consistency of the products, which facilitates the production of long-term combined time series. The main difference between the two satellite products is related to the use of different cloud algorithms, leading to a positive bias of OMI compared to TROPOMI of up to 30% in tropical regions. We show that after switching off the explicit correction for cloud effects, the two datasets come into an excellent agreement. For medium to large HCHO vertical columns(larger than 5×1015 molec. cm-2) the median bias between OMI and TROPOMI HCHO columns is not larger than 10% (<0.4×1015 molec. cm-2). For lower columns, OMI observations present a remaining positive bias of about 20% (<0.8×1015 molec. cm-2) compared to TROPOMI in midlatitude regions. Here, we also use a global network of 18 MAX-DOAS (multi-axis differential optical absorption spectroscopy) instruments to validate both satellite sensors for a large range of HCHO columns. This work complements the study by Vigouroux et al. (2020), where a global FTIR(Fourier transform infrared) network is used to validate the TROPOMI HCHO operational product. Consistent with the FTIR validation study, we find that for elevated HCHO columns, TROPOMI data are systematically low (-25% for HCHO columns larger than 8 × 1015 molec. cm-2), while no significant bias is found for medium-range column values. We further show that OMI and TROPOMI data present equivalent biases for large HCHO levels. However, TROPOMI significantly improves the precision of the HCHO observations at short temporal scales and for low HCHO columns. We show that compared to OMI, the precision of the TROPOMI HCHO columns is improved by 25% for individual pixels and by up to a factor of 3 when considering daily averages in 20 km radius circles. The validation precision obtained with daily TROPOMI observations is comparable to the one obtained with monthly OMI observations. To illustrate the improved performances of TROPOMI in capturing weak HCHO signals, we present clear detection of HCHO column enhancements related to shipping emissions in the Indian Ocean. This is achieved by averaging data over a much shorter period (3 months) than required with previous sensors (5 years) and opens new perspectives to study shipping emissions of VOCs (volatile organic compounds) and related atmospheric chemical interactions. © Authors 2021
语种	英语
scopus关键词	algorithm; comparative study; formaldehyde; image resolution; Sentinel; spatiotemporal analysis; time series; troposphere; Varanidae
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246637
作者单位	Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Ringlaan 3, Uccle, 1180, Belgium; Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano (CSIC), Madrid, Spain; Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands; Meteorology and Air Quality Group, Wageningen University, Wageningen, Netherlands; Institut für Methodik der Fernerkundung (IMF), Deutsches Zentrum für Luft und Raumfahrt (DLR), Oberpfaffenhofen, Germany; Max-Planck-Institut für Chemie (MPI-C), Mainz, Germany; Institute of Environmental Physics, University of Bremen (IUP-B), Bremen, Germany; Center for Environmental Remote Sensing, Chiba University (Chiba U), Chiba, Japan; Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, China; Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México (UNAM), Mex...
推荐引用方式 GB/T 7714	De Smedt I.,Pinardi G.,Vigouroux C.,et al. Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements[J],2021,21(16).
APA	De Smedt I..,Pinardi G..,Vigouroux C..,Compernolle S..,Bais A..,...&Van Roozendael M..(2021).Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(16).
MLA	De Smedt I.,et al."Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.16(2021).