5 years of Sentinel-5P TROPOMI operational ozone profiling and geophysical validation using ozonesonde and lidar ground-based networks

Abstract - 15 % in the upper stratosphere (35–45 km) where it can exhibit vertical oscillations. The comparisons show a dispersion of about 30 % in the troposphere and 10 % to 20 % in the upper troposphere to lower stratosphere and in the middle stratosphere, which is close to mission requirements. Chi-square tests of the observed differences confirm on average the validity of the ex ante (prognostic) satellite and ground-based data uncertainty estimates in the middle stratosphere above about 20 km. Around the tropopause and below, the mean chi-square value increases up to about four, meaning that the ex ante TROPOMI uncertainty is underestimated. The information content of the ozone profile retrieval is characterised by about five to six vertical subcolumns of independent information and a vertical sensitivity (i.e. the fraction of the information that originates from the measurement) nearly equal to unity at altitudes from about 20 to 50 km, decreasing rapidly at altitudes above and below. The barycentre of the retrieved information is usually close to the nominal retrieval altitude in the 20–50 km altitude range, with positive and negative offsets of up to 10 km below and above this range, respectively. The effective vertical resolution of the profile retrieval usually ranges within 10–15 km, with a minimum close to 7 km in the middle stratosphere. Increased sensitivities and higher effective vertical resolutions are observed at higher solar zenith angles (above about 60°), as can be expected, and correlate with higher retrieved ozone concentrations. The vertical sensitivity of the TROPOMI tropospheric ozone retrieval is found to depend on the solar zenith angle, which translates into a seasonal and meridian dependence of the bias with respect to reference measurements. A similar although smaller effect can be seen for the viewing zenith angle. Additionally, the bias is negatively correlated with the surface albedo for the lowest three ozone subcolumns (0–18 km), despite the albedo's apparently slightly positive correlation with the retrieval degrees of freedom in the signal. For the 5 years of TROPOMI ozone profile data that are available now, an overall positive drift is detected for the same three subcolumns, while a negative drift is observed above (24–32 km), resulting in a negligible vertically integrated drift.

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• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: 5 years of Sentinel-5P TROPOMI operational ozone profiling and geophysical validation using ozonesonde and lidar ground-based networks ; volume:17 ; number:13 ; year:2024 ; pages:3969-3993 ; extent:25 ; Atmospheric measurement techniques ; 17, Heft 13 (2024), 3969-3993 (gesamt 25)

Beteiligte, Orts- und Zeitangaben

• Urheber: Keppens, Arno ; Di Pede, Serena ; Hubert, Daan ; Lambert, Jean-Christopher ; Veefkind, Pepijn ; Sneep, Maarten ; De Haan, Johan ; ter Linden, Mark ; Leblanc, Thierry ; Compernolle, Steven ; Verhoelst, Tijl ; Granville, José ; Nath, Oindrila ; Fjæraa, Ann Mari ; Boyd, Ian ; Niemeijer, Sander ; Van Malderen, Roeland ; Smit, Herman G. J. ; Duflot, Valentin ; Godin-Beekmann, Sophie ; Johnson, Bryan J. ; Steinbrecht, Wolfgang ; Tarasick, David W. ; Kollonige, Debra E. ; Stauffer, Ryan M. ; Thompson, Anne M. ; Dehn, Angelika ; Zehner, Claus

Weitere Informationen

• DOI: 10.5194/amt-17-3969-2024
• URN: urn:nbn:de:101:1-2408061143161.640386484422
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.