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A method for random uncertainties validation and probing the natural variability with application to TROPOMI on board Sentinel-5P total ozone measurements

Sofieva, Viktoria and Lee, Hei and Tamminen, Johanna and Lerot, Christophe and Romahn, Fabian and Loyola, Diego (2021) A method for random uncertainties validation and probing the natural variability with application to TROPOMI on board Sentinel-5P total ozone measurements. Atmospheric Measurement Techniques (AMT), 14 (4), pp. 2993-3002. Copernicus Publications. doi: 10.5194/amt-14-2993-2021. ISSN 1867-1381.

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Official URL: https://amt.copernicus.org/articles/14/2993/2021/

Abstract

In this paper, we discuss the method for validation of random uncertainties in the remote sensing measurements based on evaluation of the structure function, i.e., root-mean-square differences as a function of increasing spatiotemporal separation of the measurements. The limit at the zero mismatch provides the experimental estimate of random noise in the data. At the same time, this method allows probing of the natural variability of the measured parameter. As an illustration, we applied this method to the clear-sky total ozone measurements by the TROPOspheric Monitoring Instrument (TROPOMI) on board the Sentinel-5P satellite. We found that the random uncertainties reported by the TROPOMI inversion algorithm, which are in the range 1–2 DU, agree well with the experimental uncertainty estimates by the structure function. Our analysis of the structure function has shown the expected results on total ozone variability: it is significantly smaller in the tropics compared to mid-latitudes. At mid-latitudes, ozone variability is much larger in winter than in summer. The ozone structure function is anisotropic (being larger in the latitudinal direction) at horizontal scales larger than 10–20 km. The structure function rapidly grows with the separation distance. At mid-latitudes in winter, the ozone values can differ by 5 % at separations 300–500 km. The method discussed is a powerful tool in experimental estimates of the random noise in data and studies of natural variability, and it can be used in various applications.

Item URL in elib:https://elib.dlr.de/146093/
Document Type:Article
Title:A method for random uncertainties validation and probing the natural variability with application to TROPOMI on board Sentinel-5P total ozone measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sofieva, ViktoriaFinnish Meteorological Institute, Helsinki, FinlandUNSPECIFIED
Lee, HeiFinnish Meteorological Institute, Helsinki, FinlandUNSPECIFIED
Tamminen, JohannaFinnish Meteorological Institute (FMI), Helsinki, FinlandUNSPECIFIED
Lerot, ChristopheBIRA-IASB, Bruxelles, BelgiumUNSPECIFIED
Romahn, FabianFabian.Romahn (at) dlr.deUNSPECIFIED
Loyola, DiegoDiego.Loyola (at) dlr.dehttps://orcid.org/0000-0002-8547-9350
Date:22 April 2021
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI :10.5194/amt-14-2993-2021
Page Range:pp. 2993-3002
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:TROPOMI, ozone, random uncertainties
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research, R - Spectroscopic methods of the atmosphere
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Loyola, Dr.-Ing. Diego
Deposited On:25 Nov 2021 10:43
Last Modified:01 Dec 2021 10:24

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