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Evidence for Wavelike Anomalies with Short Meridional and Large Zonal Scales in the Lower Stratospheric Temperature Field

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  • 1 Laboratory for Atmospheric Sciences, NASA Goddard Space Flight Center, Greenbelt, MD 20771
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Abstract

Global microwave brightness temperature measurements are analyzed to investigate the range of meridional wavelengths 2000–3000 km where spectral studies reveal larger than expected variance. The data, from the TIROS-N Microwave Sounding Unit, are sensitive to lower stratospheric temperatures (30–150 mb). The results reveal striking temperature anomalies with short meridional wavelengths (2000–3000 km) and long zonal wavelengths (zonal wavenumbers 1–4). The anomalies, with amplitudes ∼1–2 K, extend from the equatorial region to at least as high as 70°N and 70°S during January 1979. The features exhibit slow eastward movement or else are nearly stationary for several days. In the Northern Hemisphere, comparison with NMC data reveals that the strongest features tend to be associated with major jet streams.

Abstract

Global microwave brightness temperature measurements are analyzed to investigate the range of meridional wavelengths 2000–3000 km where spectral studies reveal larger than expected variance. The data, from the TIROS-N Microwave Sounding Unit, are sensitive to lower stratospheric temperatures (30–150 mb). The results reveal striking temperature anomalies with short meridional wavelengths (2000–3000 km) and long zonal wavelengths (zonal wavenumbers 1–4). The anomalies, with amplitudes ∼1–2 K, extend from the equatorial region to at least as high as 70°N and 70°S during January 1979. The features exhibit slow eastward movement or else are nearly stationary for several days. In the Northern Hemisphere, comparison with NMC data reveals that the strongest features tend to be associated with major jet streams.

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