Wernli, H, Boettcher, M, Joos, H et al. (2 more authors) (2016) A trajectory-based classification of ERA-Interim ice clouds in the region of the North Atlantic storm track. Geophysical Research Letters, 43 (12). pp. 6657-6664. ISSN 1944-8007
Abstract
A two-type classification of ice clouds (cirrus) is introduced, based on the liquid and ice water content, LWC and IWC, along air parcel backward trajectories from the clouds. In situ cirrus has no LWC along the trajectory segment containing IWC; it forms via nucleation from the gas phase. In contrast, liquid-origin cirrus has both LWC and IWC along their backward trajectories; it forms via lifting from the lower troposphere and freezing of mixed-phase clouds. This classification is applied to 12 years of ERA-Interim ice clouds in the North Atlantic region. Between 400 and 500 hPa more than 50% are liquid-origin cirrus, whereas this frequency decreases strongly with altitude (<10% at 200 hPa). The relative frequencies of the two categories vary only weakly with season. More than 50% of in situ cirrus occur on top of liquid-origin cirrus, indicating that they often form in response to the strong lifting accompanying the formation of liquid-origin cirrus.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016, American Geophysical Union. This is an author produced version of a paper published in Geophysical Research Letters. Uploaded with permission from the publisher. |
Keywords: | cirrus clouds; ice clouds; trajectories; storm track |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst for Climate & Atmos Science (ICAS) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 31 Aug 2016 14:58 |
Last Modified: | 17 Oct 2017 17:15 |
Published Version: | http://dx.doi.org/10.1002/2016GL068922 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1002/2016GL068922 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:104095 |