Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/14994

Title: Vertically resolved monitoring of atmospheric aerosols over Portugal with a multi-wavelength Raman Lidar
Authors: PreiBler, Jana
Advisors: Silva, Ana Maria Guedes de Almeida
Issue Date: 2013
Publisher: Universidade de Évora
Abstract: Foram realizadas pela primeira vez em Portugal medições regulares com Lidar. As medições com alta resolução da distribuição vertical dos aerossóis foram efetuadas com um Lidar Raman multiespectral instalado no Centro de Geofísica de _Évora (38.57_ N, 7.91_ W, 290 m acima do nível do mar) em _Évora, desde Setembro de 2009. Neste trabalho é apresentada uma climatologia de dois anos de tipos diferentes de aerossóis. Foram caracterizadas camadas de aerossóis na troposfera livre do ponto de vista das suas propriedades ópticas. Além das medições regulares efetuadas em datas pré estabelecidas, foram também realizados estudos intensivos durante eventos específicos: aerossóis de erupções vulcânicas na troposfera e estratosfera, de incêndios florestais e poeiras minerais do Sahara foram estudados detalhadamente. Nestes casos, os dados de Lidar foram combinados com dados de outros instrumentos de detecção remota activa e passiva e também in-situ instalados na superfície, para obter uma caracterização mais completa dos aerossóis; ABSTRACT: For the rst time, lidar measurements were performed in Portugal on a regular basis. Highly resolved measurements of the vertical distribution of aerosols were done with a multi-wavelength Raman lidar at the Evora Geophysics Center (Centro de Geof sica de Evora) (CGE) (38.57 N, 7.91 W, 290 m above sea level (asl)) in Evora since September 2009. A two-year climatology of di erent types of aerosols is presented within this work. Free tropospheric aerosol layers were characterised regarding their optical properties. Besides regular measurements performed on xed dates, intensive studies of special events were realised. Aerosol from volcanic eruptions in the free troposphere and stratosphere, forest re smoke as well as mineral dust from the Sahara were transported towards the southern Iberian peninsula and were investigated thoroughly. For such studies, the data of the ground based lidar were combined with other active and passive remote sensing and ground based in-situ instruments to allow a comprehensive aerosol characterisation; Zusammenfassung: Erstmalig wurden regelm a ige Lidarmessungen in Portugal durchgef uhrt. Mit einem Mehrwellenl angen-Raman-Lidar wird seit September 2009 am Centro de Geof sica de Evora (38.57 N, 7.91 W, 290 m uber dem Meeresspiegel) in Evora die vertikale Aerosolverteilung gemessen. Anhand von Daten eines Zeitraumes von zwei Jahren wurde eine Charakterisierung verschiedener Aerosoltypen erstellt. Daf ur wurden die optischen Eigenschaften von Aerosolschichten in der freien Troposph are bestimmt. Neben regelm a igen Messungen zu festen Zeiten wurden intensive Langzeitmessungen durchgef uhrt, z. B. von Vulkanaerosol in der Troposph are und Stratosph are, Waldbrandaerosol und W ustenstaub aus der Sahara. F ur eine umfassende Untersuchung der Aerosoleigenschaften wurden f ur diese Studien die Lidardaten mit Daten aus anderen aktiven und passiven Fernerkundungsmessungen sowie bodengebundenen in-situ Messungen kombiniert.
URI: http://hdl.handle.net/10174/14994
Type: doctoralThesis
Appears in Collections:BIB - Formação Avançada - Teses de Doutoramento

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