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Satellite observations of seasonality and long-term trend in cirrus cloud properties over Europe: Investigation of possible aviation impacts

Li, Qiang und Groß, Silke Martha (2022) Satellite observations of seasonality and long-term trend in cirrus cloud properties over Europe: Investigation of possible aviation impacts. Atmospheric Chemistry and Physics (ACP), Seiten 15963-15980. Copernicus Publications. doi: 10.5194/acp-22-15963-2022. ISSN 1680-7316.

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Offizielle URL: https://acp.copernicus.org/articles/22/15963/2022/

Kurzfassung

Linear contrails and contrail cirrus induced by global aviation have long been known to contribute to climate change by warming the atmosphere. Besides increasing global cirrus cloudiness, aviation may also alter the properties of natural cirrus clouds by soot emissions which lead to more heterogeneous freezing. During the first COVID-19 lockdown in Europe, changes in the properties and occurrence of cirrus clouds were determined with the lidar measurements of CALIPSO, which are presumed to be caused by the corresponding reduction in civil aviation. In the 10 years before the COVID-19 outbreak, however, aviation grew strongly in terms of CO2 emissions and flight densities in Europe. In this study, 10-year lidar measurements with CALIPSO are analysed to determine the seasonality and long-term trends in cirrus clouds as well as their correlations with the ambient temperatures and air traffic. The results show that there is a distinct seasonal cycle in the occurrence rates (ORs) and particle linear depolarization ratio (PLDR) of cirrus clouds. In addition, cirrus clouds appear within a broader altitude range in winter than in summer and they are characterized by larger OR and PLDR values in winter than in summer. The monthly medians of PLDR as well as their deseasonalized time series in the 10-year period before COVID-19 both show positive trends, which are statistically significant according to the Mann–Kendall (MK) significance test. However, the ORs of cirrus clouds show a negative trend, which might be connected with the background meteorological conditions. Since the cirrus PLDR strongly depends on the ambient temperatures, the contributions induced by temperature are further removed from the cirrus PLDR with a simple linear regression model. The derived residuals show significant positive trends according to the MK test. To compare the cirrus PLDR and air traffic (with the CO2 emissions from aviation as a proxy), the deseasonalization of both datasets were previously conducted since the seasonal cycles in both are not consistent. The deseasonalized time series determined for the cirrus PLDR and CO2 emissions from aviation both show increasing trends and their correlation coefficient is r = 0.54 at the confidence level above 99.5 %. Finally, comparisons between the cirrus PLDR and aviation in every season were made and revealed a strong correlation in other seasons than in summer.

elib-URL des Eintrags:https://elib.dlr.de/193299/
Dokumentart:Zeitschriftenbeitrag
Titel:Satellite observations of seasonality and long-term trend in cirrus cloud properties over Europe: Investigation of possible aviation impacts
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Li, QiangDLR, IPAhttps://orcid.org/0000-0003-1951-8144NICHT SPEZIFIZIERT
Groß, Silke MarthaDLR, IPAhttps://orcid.org/0000-0002-7467-9269NICHT SPEZIFIZIERT
Datum:20 Dezember 2022
Erschienen in:Atmospheric Chemistry and Physics (ACP)
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.5194/acp-22-15963-2022
Seitenbereich:Seiten 15963-15980
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der HerausgeberHerausgeber-ORCID-iDORCID Put Code
Tesche, MatthiasLeibnitz Inst. for Tropospheric Research, Leipzighttps://orcid.org/0000-0003-0096-4785NICHT SPEZIFIZIERT
Verlag:Copernicus Publications
ISSN:1680-7316
Status:veröffentlicht
Stichwörter:Lidar; Cirrus; Depolarization; Aviation impact; Long-term trend;
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt MABAK
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Li, Dr. Qiang
Hinterlegt am:13 Jan 2023 13:44
Letzte Änderung:24 Jan 2023 10:30

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