340
GUNN AK K I 1 I.LIJN IlF.KCi
10 cm
density (a,) and the current vector (11) have been determined. The
stratifici~tion is given by the paramctcr
Individu~il values of the gri~dients tisu~illy vary cc~nsiderably : the mean variation around the ilveritgc is 30 "(,. Tlic viirintion is mainly due to natural
vi1 r ia t io ns of t hc 0 bserv ctl I'ii ril mc I crs .
In all the prcscnt cxpcrinicnts. tlic iiiciin wind has been weak, less than
about 3 ni s'- I , r~nd thc S U I ' ~ ~ I C C
wuvc ilcIiot1 very slight or absent. The experiments cover ;I wide range of environmcntal conditions (Tuble I). All the
experiments were carried out i n stable conditions. The duration of the tracing varies between 4 and 80 hr.
In many cases the tcnipcruturc structure was observcd using a speciiilly
designed (by MI.. H. Westcrberg) temperature gradient meter. Mostly the
teniperiiturc profiles showed scvcrnl regions with typical small-scale structure interrupted by ~tlmost isotlicrmal parts. The dye was injected in one of
the regions wilh ~ m i ~ l l - ~ ~ i ~ l c
variations; the observed dye distributions are
not artiticially gcncrutcd by the iii.icction of the dye.
GUNN AK K I 1 I.LIJN IlF.KCi
10 cm
density (a,) and the current vector (11) have been determined. The
stratifici~tion is given by the paramctcr
Individu~il values of the gri~dients tisu~illy vary cc~nsiderably : the mean variation around the ilveritgc is 30 "(,. Tlic viirintion is mainly due to natural
vi1 r ia t io ns of t hc 0 bserv ctl I'ii ril mc I crs .
In all the prcscnt cxpcrinicnts. tlic iiiciin wind has been weak, less than
about 3 ni s'- I , r~nd thc S U I ' ~ ~ I C C
wuvc ilcIiot1 very slight or absent. The experiments cover ;I wide range of environmcntal conditions (Tuble I). All the
experiments were carried out i n stable conditions. The duration of the tracing varies between 4 and 80 hr.
In many cases the tcnipcruturc structure was observcd using a speciiilly
designed (by MI.. H. Westcrberg) temperature gradient meter. Mostly the
teniperiiturc profiles showed scvcrnl regions with typical small-scale structure interrupted by ~tlmost isotlicrmal parts. The dye was injected in one of
the regions wilh ~ m i ~ l l - ~ ~ i ~ l c
variations; the observed dye distributions are
not artiticially gcncrutcd by the iii.icction of the dye.