edu.ucar.opensky::articles:12987 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T03:42:16.916655 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7pv6m7t A multidecadal study of cirrus in the tropical tropopause layer 2013-07-27T00:00:00Z publication https://n2t.org/ark:/85065/d7pv6m7t https://doi.org/10.1002/jgrd.50596 Massie, Steven T. author Khosravi, Rashid author Gille, John author UCAR/NCAR - Library publisher Changes in the distributions of cirrus in the upper troposphere centered at 100 hPa in the tropical tropopause layer (TTL) during the last 27 years (1985-2012) are quantified based upon an analysis of five independent data sets. Stratospheric Aerosol and Gas Experiment II, Halogen Occultation Experiment, Cryogenic Limb Array Etalon Spectrometer, High Resolution Dynamics Limb Sounder, and Cloud-Aerosol Lidar with Orthogonal Polarization data are used to determine cirrus frequency-of-occurrence geospatial distributions in the TTL in multiple year segments during 1985–2012. Full width at half maximum (FWHM) tropical widths of cirrus zonal averages of occurrence frequency centered at 100 hPa are calculated for each experiment. The FWHMs have a 2σ trend of 0.28 ± 1.5° decade⁻¹1. This statistically insignificant trend is similar to those calculated by Davis and Rosenlof (2012) based upon analyses of reanalysis tropopause height and tropopause latitudinal gradients near 100 hPa. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2013 American Geophysical Union. None eng geoscientificInformation