Antarctic Meteorology and Climatology: Studies Based on by David H. Bromwich, Charles R. Stearns

By David H. Bromwich, Charles R. Stearns

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Published by means of the yank Geophysical Union as a part of the Antarctic study Series.


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E v e n though the Sun w a s a b o v e the horizon b e t w e e n 22 and 24 hr d , there w a s a strong diurnal variation in t e m p e r a t u r e . T h e minimum of nearly - 2 2 ° C o c c u r r e d at 0300 local standard time ( L S T ) , while the m a x i m u m occurs at 1400 L S T with a t e m p e r a t u r e of - 1 3 ° C . T h e c u r v e is sinuso­ idal and s m o o t h , an effect of averaging over the 33-day period. T h e relative humidity s h o w s t h e reciprocal diurnal variation. M a x i m a are found at night (86%), while a minimum o c c u r s at the time w h e n the t e m p e r a t u r e r e a c h e s it m a x i m u m (65%).

F u r t h e r u p , t h e wind speed increases with height. T h e variations of the m e a n profiles of wind direction do not s h o w a distinguished diurnal p a t t e r n ; h o w e v e r , the change in wind direction is v e r y small in b o t h t h e b o u n d a r y layer and the free a t m o s p h e r e . Figure 21 shows t h e a v e r a g e t e m p e r a t u r e profile obtained at D57 and D u m o n t d'Urville (Figure 1) at t h e h o u r 0900 L S T during t h e e x p e r i m e n t . T h e t e m p e r a t u r e profile at D57 s h o w s an inversion layer from the surface (average surface p r e s s u r e of 750 mbar) to t h e 720-mbar level, a c o n s t a n t t e m p e r a t u r e layer from the 720-mbar level to t h e 690-mbar level, a n d a c o n s t a n t lapse layer a b o v e the 690-mbar level.

Weidner, Sensible and latent heat flux estimates in Antarctica, this volume. Stearns, C. , and G. Wendler, Research results from Ant­ arctic automatic weather stations, Rev. ,26, 45-61, 1988. -French experiment commenced in Adelie Coast, eastern Antarctica. The experiment is called I AGO, for Interactions-Atmosphere-Glace-Ocean. One of the main purposes of this investigation is to obtain a better understanding of the katabatic wind, which is very well developed in this area. This paper summarizes some of the findings so far.

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