TY - JOUR
T1 - High Resolution Dynamics Limb Sounder
T2 - Experiment overview, recovery, and validation of initial temperature data
AU - Gille, John
AU - Barnett, John
AU - Arter, Philip
AU - Barker, Marion
AU - Bernath, Peter
AU - Boone, Chris
AU - Cavanaugh, Charles
AU - Chow, Jonathan
AU - Coffey, Michael
AU - Craft, James
AU - Craig, Cheryl
AU - Dials, Michael
AU - Dean, Vincil
AU - Eden, Thomas
AU - Edwards, D. P.
AU - Francis, Gene
AU - Halvorson, Chris
AU - Harvey, Lynn
AU - Hepplewhite, Christopher
AU - Khosravi, Rashid
AU - Kinnison, Douglas
AU - Krinsky, Charles
AU - Lambert, Alyn
AU - Lee, Hyunah
AU - Lyjak, Lawrence
AU - Loh, Joanne
AU - Mankin, William
AU - Massie, Steven
AU - McInerney, Joseph
AU - Moorhouse, Joseph
AU - Nardi, Bruno
AU - Packman, Daniel
AU - Randall, Cora
AU - Reburn, Jolyon
AU - Rudolf, Wayne
AU - Schwartz, Michael
AU - Serafin, John
AU - Stone, Kenneth
AU - Torpy, Brendan
AU - Walker, Kaley
AU - Waterfall, Alison
AU - Watkins, Robert
AU - Whitney, John
AU - Woodard, Douglas
AU - Young, Gregory
PY - 2008/8/27
Y1 - 2008/8/27
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/52349109496
U2 - 10.1029/2007JD008824
DO - 10.1029/2007JD008824
M3 - Article
AN - SCOPUS:52349109496
SN - 0148-0227
VL - 113
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
IS - 16
M1 - D16S43
ER -