edu.ucar.opensky::articles:21854 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:53:50.636974 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7n019bm https://doi.org/10.5067/AQUA/AIRS/DATA201 https Related Dataset #1 Aqua AIRS L2 standard retrieval product using AIRS IR and AMSU, without-HSB V6 Ice cloud microphysical trends observed by the Atmospheric Infrared Sounder 2018-07-26T00:00:00Z publication https://n2t.org/ark:/85065/d7n019bm https://doi.org/10.5194/acp-18-10715-2018 Kahn, B. H. author Takahashi, H. author Stephens, G. L. author Yue, Q. author Delanoë, J. author Manipon, G. author Manning, E. M. author Heymsfield, Andrew J. author UCAR/NCAR - Library publisher We use the Atmospheric Infrared Sounder (AIRS) version 6 ice cloud property and thermodynamic phase retrievals to quantify variability and 14-year trends in ice cloud frequency, ice cloud top temperature (T-ci), ice optical thickness (tau(i)) and ice effective radius (r(ei)). The trends in ice cloud properties are shown to be independent of trends in information content and chi(2). Statistically significant decreases in ice frequency, tau(i), and ice water path (IWP) are found in the SH and NH extratropics, but trends are of much smaller magnitude and statistically insignificant in the tropics. However, statistically significant increases in r(ei) are found in all three latitude bands. Perturbation experiments consistent with estimates of AIRS radiometric stability fall significantly short of explaining the observed trends in ice properties, averaging kernels, and chi(2) trends. Values of r(ei) are larger at the tops of opaque clouds and exhibit dependence on surface wind speed, column water vapour (CWV) and surface temperature (T-sfc) with changes up to 4-5 mu m but are only 1.9% of all ice clouds. Non-opaque clouds exhibit a much smaller change in r(ei) with respect to CWV and T-sfc. Comparisons between DARDAR and AIRS suggest that r(ei) is smallest for single-layer cirrus, larger for cirrus above weak convection, and largest for cirrus above strong convection at the same cloud top temperature. This behaviour is consistent with enhanced particle growth from radiative cooling above convection or large particle lofting from strong convection. 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 2018 Author(s). This work is licensed under a Creative Commons Attribution 4.0 International license. None eng geoscientificInformation