Measurements of polar mesospheric clouds in infrared emission by MIPAS/ENVISAT
نویسندگان
چکیده
منابع مشابه
Removal of meteoric iron on polar mesospheric clouds.
Polar mesospheric clouds are thin layers of nanometer-sized ice particles that occur at altitudes between 82 and 87 kilometers in the high-latitude summer mesosphere. These clouds overlap in altitude with the layer of iron (Fe) atoms that is produced by the ablation of meteoroids entering the atmosphere. Simultaneous observations of the Fe layer and the clouds, made by lidar during midsummer at...
متن کاملSpectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds
We have analyzed mid-infrared limb-emission measurements of polar stratospheric clouds (PSCs) by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) during the Antarctic winter 2003 with respect to PSC composition. Coincident Lidar observations from McMurdo were used for comparison with PSC types 1a, 1b and 2. Application of new refractive index data of β-NAT have allowed to a...
متن کاملOn the seasonal onset of polar mesospheric clouds and the breakdown of the stratospheric polar vortex in the Southern Hemisphere
[1] Southern Hemisphere (SH) polar mesospheric clouds (PMCs), also known as noctilucent clouds, have been observed to be more variable and, in general, dimmer than their Northern Hemisphere (NH) counterparts. The precise cause of these hemispheric differences is not well understood. This paper focuses on one aspect of the hemispheric differences: the timing of the PMC season onset. Observations...
متن کاملDiscovery of a Water Vapor Layer in the Arctic Summer Mesosphere: Implications for Polar Mesospheric Clouds
We report the discovery of a layer of enhanced water vapor in the Arctic summer mesosphere that was made utilizing two new techniques for remotely determining water vapor abundances. The first utilizes Middle Atmosphere High Resolution Spectrograph Investigation (MAHRSI) OH measurements as a proxy for water vapor. The second is a reanalysis of Halogen Occultation Experiment (HALOE) water vapor ...
متن کاملInteractive comment on “Spectroscopic evidence for β-NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds” by M. Höpfner et al
This is a very interesting and well-written paper. It is the first attempt to identify in detail a particular nitric acid hydrate phase (NAT) by the aid of infrared spectroscopy directly in the stratosphere. Höpfner et al. have analyzed mid-infrared limb-emission measurements of PSCs by the MIPAS system during the Antarctic winter 2003. They have investigated a single IR band at 820 cm−1 compar...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Atmospheres
سال: 2009
ISSN: 0148-0227
DOI: 10.1029/2009jd012548