6533b832fe1ef96bd129abaf
RESEARCH PRODUCT
In situ measurements of ice saturation in young contrails
Marcus KlingebielHans SchlagerTroy ThornberryTina JurkatStefan H. E. KaufmannStefan H. E. KaufmannChristiane VoigtAlfons SchwarzenboeckPhilipp JeßbergerPhilipp Jeßbergersubject
In situgeographySupersaturationgeography.geographical_feature_category010504 meteorology & atmospheric sciences010502 geochemistry & geophysicsAtmospheric sciences01 natural sciencesGeophysicsVolcano13. Climate actionGeneral Earth and Planetary SciencesEnvironmental scienceCirrusRelative humiditySaturation (chemistry)Water vapor0105 earth and related environmental sciencesdescription
Relative humidity with respect to ice (RHi) is a major factor controlling the evolution of aircraft contrails. High-resolution airborne H2O measurements in and near contrails were made at a rate of 4.2 Hz using the novel water vapor mass spectrometer AIMS-H2O with in-flight calibration during the CONtrail, volcano, and Cirrus ExpeRimenT (CONCERT) 2011. Three 2 min old contrails were sampled near 11 km altitude. Independent of the ambient supersaturation or subsaturation over ice, the mean of the RHi frequency distribution within each contrail is shifted toward ice saturation. This shift can be explained by the high ice surface area densities with corresponding RHi relaxation times on the order of 20 s, which lead to the fast equilibration of H2O between the vapor and ice phase. Understanding the interaction of water vapor with ice particles is essential to investigate the life cycle of contrails and cirrus.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-28 | Geophysical Research Letters |