516 DYNAMICS OF THE ATMOSPHERE 
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ARCTIC CIRCLE 
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IP 
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TROPIC OF CANCER 
\ 
i 
LUNAR ATMOSPHERIC TIDE (SSS 
(0) 100 MICROBARS 
AMPLITUDE & PHASE: AMPLITUDE SCALE 
ANNUAL MEAN | 
ANTARCTIC CIRCLE 
160 wesT 120 80 '20 ‘Fast 160 
Fig. 5.—Geographical distribution of the annual mean lunar semidiurnal air tide L2 in barometric pressure, indicated by dial 
vectors, each referring to the place at the mid-point of the arrow, whose length gives the amplitude /2 on the scale shown, and 
whose direction gives the time of high air tide, as shown on a local mean lunar clock. 
- 160 80 120 160 
80 BO 
;. ° 
De 
a To 
- ° a Q j 
ARCTIC SCIRCLE LL Ne 
al RS 
] aC 
= = (Vn 60 
Ab == 
é 20 MICROBARS _ — 
ee eke 
ss AS 26% — 
30 MICROBARS "2 40 
+ 40 MICROBARS ala 
TROPIC OF _CANC 36 49 
20) a5 49 60 = <= 20 
a ~|( [60 micRopars \53 | 73 
x 0 
[EQUATOR Sees a 69 gO MICROBARS N, |, L 
= | Sax = SCC Filcen limi eS = 7\ fo} 
‘sal ¥ yj 84 84 83) FS y 
73 Slee 2 =A el [ & 
20,4 = 59| 75 a 50 MICROBARS|.—}—/20 
Stone OF CAPRICORN ~ — —— SS ar Se 
ie — le ~ 46 pox 
% [Psa 30 MICROBARS| 99 | \ 
«05397 — Sa Sa = 39° 
3 Bx 
“S. 
Ee fie 
ANTARCTIC CIRCLE 
L 160 west 120 60 40 ) 40 60 120. EAST 160 
Fic. 6—Tentative lines (broken where only weakly determined) of equal amplitude J, (im microbars) of the annual mean 
lunar semidiurnal air tide L. in barometric pressure. The numbers (other than those, 10, 20,..., 80, followed by the word “mi- 
crobar,’’ which show the value of I; for each line) show local values of lo. 
