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| Titel |
Atmospheric diurnal variations observed with GPS radio occultation soundings |
| VerfasserIn |
F. Xie, D. L. Wu, C. O. Ao, A. J. Mannucci |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 14 ; Nr. 10, no. 14 (2010-07-26), S.6889-6899 |
| Datensatznummer |
250008661
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| Publikation (Nr.) |
 copernicus.org/acp-10-6889-2010.pdf |
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| Zusammenfassung |
| The diurnal variation, driven by solar forcing, is a fundamental mode in the
Earth's weather and climate system. Radio occultation (RO) measurements from
the six COSMIC satellites (Constellation Observing System for Meteorology,
Ionosphere and Climate) provide nearly uniform global coverage with high
vertical resolution, all-weather and diurnal sampling capability. This paper
analyzes the diurnal variations of temperature and refractivity from
three-year (2007–2009) COSMIC RO measurements in the troposphere and
stratosphere between 30° S and 30° N. The RO observations reveal both
propagating and trapped vertical structures of diurnal variations, including
transition regions near the tropopause where data with high vertical
resolution are critical. In the tropics the diurnal amplitude in
refractivity shows the minimum around 14 km and increases to a local maximum
around 32 km in the stratosphere. The upward propagating component of the
migrating diurnal tides in the tropics is clearly captured by the GPS RO
measurements, which show a downward progression in phase from stratopause to
the upper troposphere with a vertical wavelength of about 25 km. At ~32 km the seasonal variation of the tidal amplitude maximizes at the
opposite side of the equator relative to the solar forcing. The vertical
structure of tidal amplitude shows strong seasonal variations and becomes
asymmetric along the equator and tilted toward the summer hemisphere in the
solstice months. Such asymmetry becomes less prominent in equinox months. |
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