MA USAM , 49. 2 (April 19981. 223·2 28

55 1.51 3 ; 551.55 : 551.524.7

Comparison of quasi-biennial oscillations of stratospheric winds andatmospheric temperatures at different altitudes

R.P.KANE

Instituto Nacional de Pesqu isas Espac iais > INPECaua Posta l 5/5 - 12201-970. Siio l ost dos Campos, SP. Brasil

(Received 3 April /996. Modified 16 October 1996)

llR - 1959-89 in <frrR. 50 h",ql%'" MtQ qq.jj 1;; 12 '!tAl 1;; '1f<'AR lfTUllIR 3"ffit 3fn:~l:f1lft rir.ntf q 'Ill:~ 1;;~ (950.850-300,300-100 3fn: roo-so j . 'lI,) 4l: 3fum q'q4s.oQffi'ro'! . lI~rio -Jflr:>l,,"'ifl'" 'l ~,el' l\'i 1;;~ lIifI; ffi'ro'! (~, ~. it.) .3fn 3"ffit yq q 30 t . 'lI.

ffi'ro'! (1m 10 ~~ it 90 ~1 '3. 1;; .3fum <II'I"IT'ii it~ 3Ttl ;fu;Ri ("'l.. <ft.m.) "" '«II

""'"' t I ~ 4<R "'l- <ft. m. "" 3fum .3i<m\'1 29 'liR m t .~~ 300- 100 t . 'lI. 4l:

ffi'ro'! .3fn 31""'ifl,,,~ lIifI; ffi'ro'! "" 3l\mi3i<m\'1~ 1m "" m t 1 3RI <II'I"IT'ii om ~l:f1lft00 (~. m.) ,'i'ft (ffifu<f\ -~ Q,q4sJ\Q<n<I MO ~) "" 3l\mi 3i<m\'11fT 3!fuq; m I

~fol~~ it '«II ""'"' t ~ it = 2.33 'l'l 4l:~~ 4<R "'l.. <ft.3ft.~ l('ll t\ m.~ lI~rio lW em: ffi'ro'! 3fn 30 l 41 . '3<f{ IJ'I ffi'ro'! <5\~~ it = 2.3 'l'l 4l:

3lfuq;oq "'l- <ft. m. ;;rq m ~ . 3RI lII'l\'1l "" "'l- <ft. 3ft. it = 2.5 ·2.6 'l'l 1;; WN'1 ~fM m~ I 3-6 'l'l q 'l'fl <II'I"IT'ii "" "'l- <ft. 3ft.3lfuq;oq m ~ ;;\T <:fulI\t 00 ~ 1;; ~ 1m 1;;3lfuq;oq it filrnn "lffiIl t I ~ 1m 1;; 1fT !PJ~ filR ~ ~ e'l(l ,q4sHIQ4<R "'l- <ft. 3ft. ""'3OJ,,,,fl,;,, 'liT ll'l\~ 1;; lII'l\'1l 1;; lll !l 3fn: 3"ffit yq 1;; lII'l\'1l 1;; 'TI!l !PJ !i<m ~ ~

~~ <:1oR "" 3RI 31eOO'i~ 1;; ll1mi\ 4l: qllfR lI'll'I m t r

ABSTRA<"''T. During 1959·89. the 12·monlhrunning means of SOhPa zoeal winds. the avenge atmospherictempera­lures in the nonhemandsouthernhemisphere atfouraltitudeslabs (95OhPa., 850- JOOhPa. JOO. IOOhPa and 1~5OhP3 ). Pacificand Atlantic sea surface temperature (SST) and 30hPatemperatures at North Pole and average for ( IOO-9O"Nl. all showedquasi -biennial oscillations (QBO). However. whereas thewindQBOhadanaverage spacing 0( 29 monthS. only temperatures3t 300-IOOhP3 and Atlantic SST had similar average spacing. Other tempera tures as also SO index (represented b)' Tahitiminus Derw in armospbenc pressure) had larger average spacing. Spectral anaI)'sis showed that whereas windQDOhadonlyone prominent peak at T=2.:U years. olher parameten had weaj, QDOsncar T=2.5-2.6 yearsexcept PacificSST and JOhPaNonh Pole temperature which had small peaks nearT=2.3 years. All the temperatureshad prominenl peaks in the3-6 yearregion which marched with snularpeaks in theSO index. Then: is some indication that strarospbenc wind QBO badsomerelati on with pararrerers at all altitudes in tropics 3nd with Nonh Pole. while ENSO had considerable influence at ocher13tiludeslaltitudes.

K~y words - Quasi-Biennial Osciltauon (Q80). El-Nino Southern Oscillation (EN'SO). Sea Surface temperature(SST). Stratospheric wind. Running means.

I. Introduction

Equatorial stratospheric winds and temperatures show

a stro ng quasi-bienn ial oscillation (QBD). first doc umented

by Reed et al . ( 196 1). Veryard and Ebdo n (196 1)and Angell

and Kroshover ( 1962). System atic phase changes of the

wind QBD with latitud e and height have been reponed (e.g.

(223)

Naujokat 1986). Simi lar QBD - like oscillations have been

reponed in the troposphere also, for winds and many other

parameters (Trenbcrth 1980 and references there in). Yasu­

nari (1989) presented evidence for a possible link between

the QBDs of the stratospheric and tropospheric winds and

sea surface temperature in the tropics. However, in most of