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Abstract
Abstract. Isentrope surfaces in the Southern Hemisphere stratosphere reveal that air parcels undergo mesoscale temperature fluctuations that depend on latitude and season. The largest temperature fluctuations occur at high latitude winter, whereas the smallest fluctuations occur at high latitude summer. This is the same pattern found for the Northern Hemisphere stratosphere. However, the amplitude of the seasonal dependence in the Southern Hemisphere is only 37% of the Northern Hemisphere's seasonal amplitude.
Highlights
A companion article, “Mesoscale Temperature Fluctuations in the Stratosphere” (Gary, 2006), describes an analysis of stratospheric isentrope “wrinkles” in the Northern Hemisphere (NH) using measurements by the Microwave Temperature Profiler (MTP) aboard NASA ER-2 and DC-8 aircraft
The NH mesoscale fluctuation amplitude” (MFA) analysis employed ER-2 and DC-8 measurements at altitude regimes centered on 19 and 11 km, and permitted an investigation to be made of the altitude dependence of MFA
It was not possible to evaluate the dependence of Southern Hemisphere (SH) MFA on topography because all flights were over ocean
Summary
A companion article, “Mesoscale Temperature Fluctuations in the Stratosphere” (Gary, 2006), describes an analysis of stratospheric isentrope “wrinkles” in the Northern Hemisphere (NH) using measurements by the Microwave Temperature Profiler (MTP) aboard NASA ER-2 and DC-8 aircraft. The companion article shows that in the NH stratosphere MFA depends on the following four independent variables: latitude, season, underlying topography and altitude. Since most flights were north-south at a fixed longitude, and since MFA was suspected to depend on latitude, each flight was divided into segments with a latitude span of ∼10 degrees. This usually meant that each flight was divided into four segments of 1.5-h duration, producing a total of 81 flight segments; 75 were over ocean and 6 were over New Zealand. The median altitude for all flight segments is 19.2 km, with a range of 17.8 to 20.4 km
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