edu.ucar.opensky::articles:17510 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:19:03.616206 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7z32101 High Resolution Dynamics Limb Sounder: Experiment overview, recovery, and validation of initial temperature data 2008-06-27T00:00:00Z publication https://n2t.org/ark:/85065/d7z32101 https://doi.org/10.1029/2007JD008824 Gille, John author Barnett, J. author Arter, P. author Barker, M. author Bernath, P. author Boone, C. author Cavanaugh, Charles P. author Chow, J. author Coffey, Michael T. author Craft, J. author Craig, Cheryl A. author Dials, M. author Dean, Vincil author Eden, Thomas author Edwards, David P. author Francis, Gene author Halvorson, Chris M. author Harvey, L. author Hepplewhite, C. author Khosravi, Rashid author Kinnison, Douglas E. author Krinsky, C. author Lambert, Alyn author Lee, Hyunah author Lyjak, Lawrence V. author Loh, J. author Mankin, William G. author Massie, Steven T. author McInerney, Joseph author Moorhouse, J. author Nardi, Bruno author Packman, Daniel author Randall, C. author Reburn, J. author Rudolf, W. author Schwartz, M. author Serafin, J. author Stone, K. author Torpy, B. author Walker, K. author Waterfall, Charlotte O. G. author Watkins, R. author Whitney, J. author Woodard, D. author Young, G. author UCAR/NCAR - Library publisher The High Resolution Dynamics Limb Sounder (HIRDLS) experiment was designed to provide global temperature and composition data on the region from the upper troposphere to the mesopause with vertical and horizontal resolution not previously available. The science objectives are the study of small-scale dynamics and transports, including stratosphere-troposphere exchange, upper troposphere/lower stratosphere chemistry, aerosol, cirrus and PSC distributions, and gravity waves. The instrument features 21 channels, low noise levels, high vertical resolution, and a mechanical cooler for long life. During launch most of the optical aperture became obscured, so that only a potion of an optical beam width at a large azimuth from the orbital plane on the side away from the Sun can see the atmosphere. Irrecoverable loss of capabilities include limitation of coverage to the region 65°S-82°N and inability to obtain longitudinal resolution finer than an orbital spacing. While this optical blockage also impacted radiometric performance, extensive effort has gone into developing corrections for the several effects of the obstruction, so that radiances from some of the channels can be put into retrievals for temperature. Changes were also necessary for the retrieval algorithm. The validation of the resulting temperature retrievals is presented to demonstrate the effectiveness of these corrections. The random errors range from ~0.5 K at 20 km to ~1.0 at 60 km, close to those predicted. Comparisons with high-resolution radiosondes, lidars, ACE-FTS, and ECMWF analyses give a consistent picture of HIRDLS temperatures being 1-2 K warm from 200 to 10 hPa and within ±2 K of standards from 200 to 2 hPa (but warmer in the region of the tropical tropopause), above which HIRDLS appears to be cold. Comparisons show that both COSMIC and HIRDLS can see small vertical features down to about 2 km wavelength. While further improvements in the data are expected, these data will allow HIRDLS to provide important support toward reaching the Aura objectives. 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 An edited version of this paper was published by AGU. Copyright 2008 American Geophysical Union. None eng geoscientificInformation