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Ice-Supersaturated Regions and Subvisible Cirrus in the Northern Midlatitude Upper Troposphere

Gierens, K. and Schumann, U. and Helten, M. and Smit, H. and Wang, P.-H. (2000) Ice-Supersaturated Regions and Subvisible Cirrus in the Northern Midlatitude Upper Troposphere. Journal of Geophysical Research, 105, pp. 22743-22753.


Official URL: http://www.agu.org/journals/jd/


Humidity and temperature data from the Measurement of Ozone by Airbus in-service Aircraft (MOZAIC) project have been used to produce maps of probability for ice supersaturation in two 50 hPa thick layers centered around 200 and 250 hPa. As the MOZAIC data cover only international air routes, the resulting maps cover mainly the northern midlatitudes. The data of ice supersaturation have then been correlated with data of frequency of occurrence of subvisible cirrus from the Stratospheric Aerosol and Gas Experiment (SAGE II) satellite instrument. The correlation analysis provided strong indications that subvisible cirrus (SVC) is associated to ice-supersaturated regions (ISSRs), although processes are possible that can decouple SVC from ISSRs. A first trial to derive a global picture of ice supersaturation near the tropopause was performed using a measure of cirrus fractional coverage constructed from meteorological analyses of European Centre for Medium-Range Weather Forecasts and to correlate this with the supersaturation data. The correlation was only moderate (although significant), leading to the tentative conjecture that regions of frequent ice supersaturation are to be expected over the Indonesian archipelago, over the Amazonas basin, and over the northern Pacific between Japan and Canada. A final correlation analysis between the meteorological analysis data and the SVC data indicated that the formation of SVC is generally thermodynamically controlled, with the exception of the northern midlatitude SVC. The composition of the aerosol at the northern midlatitude tropopause is probably variable due to industrial emissions and air traffic. Hence the freezing properties of these particles may become important, which results in a weaker thermodynamic control of SVC formation in the northern midlatitudes.

Item URL in elib:https://elib.dlr.de/9238/
Document Type:Article
Title:Ice-Supersaturated Regions and Subvisible Cirrus in the Northern Midlatitude Upper Troposphere
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Helten, M.FZ Jülich, JülichUNSPECIFIED
Smit, H.FZ Jülich, JülichUNSPECIFIED
Wang, P.-H.Science and Technology Corporation, Hampton, VA, USAUNSPECIFIED
Journal or Publication Title:Journal of Geophysical Research
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 22743-22753
Keywords:atmospheric composition and structure; aerosols and particles, cloud physics and chemistry, troposphere-composition and chemistry
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:29 Jan 2008
Last Modified:31 Jul 2019 19:14

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