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dc.contributor.authorReinares Martínez, I.
dc.contributor.authorEvan, S.
dc.contributor.authorWienhold, F.G.
dc.contributor.authorBrioude, J.
dc.contributor.authorJensen, E.J.
dc.contributor.authorThornberry, T.D.
dc.contributor.authorHéron, D.
dc.contributor.authorVerreyken, B.
dc.contributor.authorKörner, S.
dc.contributor.authorVömel, H.
dc.contributor.authorMetzger, J.-M.
dc.contributor.authorPosny, F.
dc.contributor.editor
dc.date2021
dc.date.accessioned2021-07-28T06:14:45Z
dc.date.available2021-07-28T06:14:45Z
dc.identifier.urihttps://orfeo.kbr.be/handle/internal/7933
dc.descriptionA nascent in situ cirrus was observed on January 11, 2019 in the tropical tropopause layer (TTL) over the southwestern Indian Ocean, with the use of balloon-borne instruments. Data from cryogenic frost point hygrometer (CFH) and Compact Optical Backscatter and AerosoL Detector (COBALD) instruments were used to characterize the cirrus and its environment. Optical modeling was employed to estimate the cirrus microphysical properties from the COBALD backscatter measurements. Newly fomed ice crystals with radius <1 μm and concentration ∼500 L−1 were reported at the tropopause. The relatively low concentration and CFH ice supersaturation (1.5) suggests a homogeneous freezing event stalled by a high-frequency gravity wave. The observed vertical wind speed and temperature anomalies that triggered the cirrus formation were due to a 1.5-km vertical-scale wave, as shown by a spectral analysis. This cirrus observation shortly after nucleation is beyond remote sensing capabilities and presents a type of cirrus never reported before.
dc.languageeng
dc.titleUnprecedented Observations of a Nascent In Situ Cirrus in the Tropical Tropopause Layer
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freecirrus
dc.subject.freeCOBALD observation
dc.subject.freegravity wave
dc.subject.freemodeling
dc.subject.freetropical tropopause layer
dc.source.titleGeophysical Research Letters
dc.source.volume48
dc.source.issue4
dc.source.pagee2020GL090936
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2020GL090936


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