Schäuble, Dominik und Voigt, Christiane und Schlager, Hans und Stock, Paul und Krämer, Martina und Schiller, Cornelius und de Reus, Marian und Borrmann, Stephan und Curtius, Joachim (2008) Uptake of nitric acid in cirrus clouds and contrails. In: Geophysical Research Abstracts. EGU General Assembly 2008, 2008-04-13 - 2008-04-18, Wien, (A).
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Kurzfassung
The uptake of nitric acid (HNO<sub>3</sub>) in cirrus clouds and contrails in the upper troposphere leads to a reduction of the gas phase NO<sub>x</sub> (=NO+NO<sub>2</sub>) concentration, resulting in a perturbation of the ozone budget within this region. During the CIRRUS-III campaign over Northern Germany in November 2006 aircraft-based measurements of gas- and condensed-phase reactive nitrogen species (NO<sub>y</sub>), water vapour, total water, and ice particle size distribution were performed to investigate the uptake of HNO<sub>3</sub> in midlatitude cirrus clouds at altitudes between 8 and 12km. Contrails and cirrus clouds were frequently encountered in the course of this campaign. Contrails were identified by the detection of ice crystals in combination with enhanced gas phase NO<sub>y</sub> and condensation nuclei concentrations resulting from the aircraft exhaust. This method allows to unambiguously identify contrails and to separate contrails and natural cirrus clouds. The HNO<sub>3</sub>/H<sub>2</sub>O molar ratio in ice crystals and the particulate fraction of the total nitric acid (HNO<sub>3,part</sub>/HNO<sub>3,tot</sub>) were evaluated to quantify the uptake of nitric acid in ice clouds. We show the dependence of these two parameters on temperature, partial pressure of HNO<sub>3</sub>, and ice water content in the temperature range of 210 to 231K and at nitric acid partial pressures between about 1x10<sup>-8</sup> and 1.2x10<sup>-7</sup>hPa. Further, we compare our data to previous observations in midlatitude clouds. Finally, differences in the chemical composition and trace gas uptake in natural and aviation-induced ice clouds are discussed.
elib-URL des Eintrags: | https://elib.dlr.de/56472/ | ||||||||||||||||||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Poster) | ||||||||||||||||||||||||||||||||||||||||
Titel: | Uptake of nitric acid in cirrus clouds and contrails | ||||||||||||||||||||||||||||||||||||||||
Autoren: |
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Datum: | April 2008 | ||||||||||||||||||||||||||||||||||||||||
Erschienen in: | Geophysical Research Abstracts | ||||||||||||||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||||||||||
Stichwörter: | Nitric acid, uptake, ice crystals, cirrus clouds, contrails | ||||||||||||||||||||||||||||||||||||||||
Veranstaltungstitel: | EGU General Assembly 2008 | ||||||||||||||||||||||||||||||||||||||||
Veranstaltungsort: | Wien, (A) | ||||||||||||||||||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||||||||||||||||||
Veranstaltungsdatum: | 2008-04-13 - 2008-04-18 | ||||||||||||||||||||||||||||||||||||||||
Veranstalter : | European Geosciences Union | ||||||||||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Verkehr und Weltraum (alt) | ||||||||||||||||||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||||||||||||||||||
HGF - Programmthema: | L VU - Luftverkehr und Umwelt (alt) | ||||||||||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | L VU - Luftverkehr und Umwelt | ||||||||||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Schadstoffarmer Luftverkehr (alt) | ||||||||||||||||||||||||||||||||||||||||
Standort: | Oberpfaffenhofen | ||||||||||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe | ||||||||||||||||||||||||||||||||||||||||
Hinterlegt von: | Schäuble, Dominik | ||||||||||||||||||||||||||||||||||||||||
Hinterlegt am: | 02 Dez 2008 | ||||||||||||||||||||||||||||||||||||||||
Letzte Änderung: | 27 Apr 2009 15:32 |
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