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Polar Stratospheric Clouds during SOLVE/THESEO: Comparison of Lidar Observations with in Situ Measurements

Brooks, S.D. and Toon, O.B. and Tolbert, M.A and Baumgardner, D. and Gandrud, B.W. and Browell, E.V. and Flentje, H. and Wilson, J.C. (2004) Polar Stratospheric Clouds during SOLVE/THESEO: Comparison of Lidar Observations with in Situ Measurements. Journal of Geophysical Research, 109, D02212-1-D02212-14. doi: 10.1029/2003JD003463.

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Polar stratospheric clouds (PSCs) were observed on several flights during the 1999/2000 SOLVE/THESEO mission. Here we present an analysis of PSC size distribution, composition, and particle phase based on near coincident measurements using the Multiangle Aerosol Spectrometer Probe (MASP) and Focused Cavity Aerosol Spectrometer (FCAS III) on board the ER-2 as well as lidar instruments on board the DC-8 and Falcon aircrafts. We calculate the aerosol backscatter ratios and aerosol depolarization ratios at infrared and visible wavelengths based on the particle size distributions measured by the MASP and FCAS III instruments. We then compare our calculations to observed lidar measurements taken from on board the DC-8 and Falcon aircraft, which flew the same flight paths as the ER-2 on 20 January and 3 February 2000, respectively. Our comparison shows that calculations based on the mixed clouds containing small (submicrometer) spherical particles and large (2.5–22 μm diameter) nonspherical particles seen by the FCAS III and MASP are consistent with lidar observations. Our analysis shows that the infrared aerosol depolarization ratio must be measured to detect and identify mixed PSC clouds and that relying only on measurements of depolarization in the visible causes incorrect identification of mixed clouds as solution droplets. This study suggests that mixed clouds of supercooled ternary solutions were observed in coexistence with larger solid nitric acid hydrate particles.

Item URL in elib:https://elib.dlr.de/10067/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Polar Stratospheric Clouds during SOLVE/THESEO: Comparison of Lidar Observations with in Situ Measurements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Brooks, S.D.Colorado State Univ., Fort Collins, CO, USAUNSPECIFIED
Toon, O.B.Univ. of Colorado, Boulder, CO, USAUNSPECIFIED
Tolbert, M.AUniv. of Colorado, Boulder, CO, USAUNSPECIFIED
Baumgardner, D.Univ. Nacional Autónoma de México, Mexico City, MEXUNSPECIFIED
Browell, E.V.NASA Langley Research Center, Hampton, VA, USAUNSPECIFIED
Wilson, J.C.Univ. of Denver, CO, USAUNSPECIFIED
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:D02212-1-D02212-14
Keywords:polar stratospheric clouds, aerosol spectrometer, in situ measurements
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: DLR-Beauftragter, elib
Deposited On:20 Apr 2007
Last Modified:14 Jan 2010 14:56

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