AME 5.1
NARDINESS ZONES

 

 

ZONE Av. Annull Mln. Temp. Av. Anna-I Mlnt Tut-up. COMMENTS
(”5 ("(3)
I Below 50 Eelow 45 Arctic lunflla
2 -50 lo 40 -45 lo 40 Cold plains and conflels
3 ~40 lo -30 ~40 lo -:M Canllers and must! luresls
J ,30 in -2cl ~34 to -29 Cold thlenars or continents
5 A20 to ~10 291° ~23 Mtxed Invests, cool meme!
8 40 lo a .2310 rla Broadlsai and uea‘duous
Invests
7 mo 10 «am-12 Eraadleauoraets
8 \0 to an ~l2 In -7 Ana grmlands, savanhah
5 20 to an ,7 lo -l Semi-arid coasts and basins
w an in Ac 4 to A Suh-lmplcal, palms, wists
n 40 w 50 4 lo 10 Tlopiml lolasls, «sens
12 over 50 over 10 Equatorial lalnlolasls, monsoon

 

 

the northern Thul trorn latitude so—zo-, and In the

roaring lartrea", abmn I543 nllenumlg htgh-Iow
parrs at gm! relts rrreatate the earth, all at thern as
srnaller splnl systems around the suit polar splral
itsell (Finn 53) on westerly corals, the alternation o!
eold polar and warn. lugh pressure arr arrtm at lbw!
Iflday Intervals, although some great high»pressvre
eells persist in plate, "in! blucklng weuward
rnoyernent 0! wind, and creatrng static oeeahre
conditions that an alleet peeanit aver-turn, and thus
lrsheries le 5 the rl Nlrla eueetl

These great proeeasiohs are disturbed and deiteeted
try eontrnehts, stubborn hlghrpvrsulu eetls oyer tool
land rnases, and the relative intensity ol the air cells, so
that irregular mldrwnrm lronts amt/c at any one sue
lost as polar air rs somerrrnts drawn mungly towards
the equatar m the lows, sowarrn troprral atr mam are
entrained in the outer eireulatton at the highs and bring
heavy warm rarhs towards the poles ngh level
leunums rnay speed up or black this prmon and
the .etstrearn rrseli rrray alao tnealr up under stresses
caused by shear.

The dlanrrhanoea and lrnpedentes in the system earrse
eold ironta to prle up Hymns! each other and dzfled
polewards at hlgb—prasum rella, and a sequenee ert
winnr and eold-lrpnt rains «he cydonlt or aprral
rathst o1 earth results,

All Ittse wrnd behs shill north or south with the sun
annually. and to aorne sluwu eatenr aa a result at the
latsyear rnoen eyele. so that periods eri mush! and
ereesslve rain rah result The system appears chaotte,
and subjefl only to short—term predietrrrn, hutol late we
are learning to assess some al the elleets art the
longrlzmt cycles,

m w! sprral emulation ol the south polar regions
is shown in rigure 5.: About lzets cold lrortts (dnud
bandst etrete trorn west trr east around the polea,

m7

anivmg as -eyetor.ie lrollls" every la or so dayr on
mean rn that region They atteet areas up to w aouth,
with tour or so large lranta rantrnuoua with land
probably dnving) etvud tip ro in- south or north
latitude, rhostty along the western maxgms at Scum
Arnet-tea, Mara, and the south Arlinllt. lt is now tlear
that it rs the orerrrrr etrerrlalroh that drives the air
rnassaa, rather than the opposite,

nte lronts are dragged tn a rum In the wast as the
unh splits to the east. Eaeh eloud ltont rs a result ol'dw
meeting oi told polar and warm suta.polar air masses
or high-pressure eells The low—pressure areas rotate
rloelrwlse, the lush: anti-eloekwrse rn a serres at
tagwlikc spirals ar tort that travel every 3—4 rrtantha
around the poles Rounun is in the oppasrte sense In
the northern hernraphere. lt rr the cold, dense. dry polar
arr sweeping on the tee-ops, and the hot nsms arr al
the equatorial ralrrts whreh drives these great wheels;
eleaHtr (descaldlng) inlru ns ate ol holedry arid
(olded'y continental air lttusiral'a, Alrreal or air
dearendtrrg irotn the equatorial msmg) cungmznm
(figure so,

in the next seetiaha oi thrs ehapter, l will tre
diaeuasrng CLIMA‘nC FACI‘DRS under parts, as below

r Pmplhhon lrath,log.dew.evaparaoon-atl,

- Radiation llrytt, heat, lapel, solar input-ssh

- mrrda (nmml wrnrls. hurrirarres and tornadoes ,

set;

- landaeape elteets laltihnle, vulcys, slopes“; and

- hfiludfilhlude [mat-5155).

 

 

4
PRECIPITATlDN

There are two basre rnpuis to preeipttatteh: that at
rarnlall, snow, and hart (WATER FALLING treat the