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Detailed Reference Information |
Pawson, S. and Naujokat, B. (1997). Trends in daily wintertime temperatures in the northern stratosphere. Geophysical Research Letters 24: doi: 10.1029/97GL00352. issn: 0094-8276. |
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Long-term changes in the extrema reached in 31 years of daily northern stratospheric temperatures (T) are discussed. The lowest T reached at any location on any day (Tmin) show trends of -1.90 and -1.85 K/decade at 50 hPa and 30 hPa. Increases in the maxima (Tmax) are twice as large at 30 hPa as at 50 hPa. The trends are superimposed on a low-frequency variability of Tmin with clear peaks between 1975/1976 and 1986/1987 and after 1991/1992. Before the middle 1970s no very low Tmin were observed; this is very likely an observational constraint since T=192 K this may be the lowest detectable value in the earliest years. A more robust measure of the coldness of the lower stratosphere is the area with T<195 K at 50 hPa, which is relevant for PSC formation. It increased considerably over the 31 years owing largely to the persistence of cold days.¿ 1997 American Geophysical Union |
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Abstract |
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Keywords
Global Change, Atmosphere (0315, 0325), Meteorology and Atmospheric Dynamics, Climatology, Meteorology and Atmospheric Dynamics, Middle atmosphere dynamics (0341, 0342), Atmospheric Composition and Structure, Middle atmosphere—composition and chemistry |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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