94
D. A. MCGILL:
SOUTHWEST MONSOON
REO SEA
30·
20"
10·
0"
30·
20·
S I
I
I
I
S
N fAg-at 1- 1
WESTERN PERIMETER
~
r
MOZAMBIQUE CHANNEL
0.20
+
+
0.15
~
PARTICULATE ORGANIC P
0.10
~
@
~
0.05
0.00
0.30
....
0.25
....
t'.----+ .... ~ .... +--.+-.. -.'t"~ .. -..,.
.. ' . .. ~.,
0.20
+ ....................... +
0.15
TOTAL ORGANIC P
@ +-. ............ !r-. . . . .
0.10
+
, "1--1"' ................. /
-*
0.05
+-------1--.
0.00
NORTHEAST MONSOON
SOCOTRA
ARABIAN COAST
,ug -atl-1 s,---3O"-+1_--f1_·_-I I ?_· --IT S,-3+0"_-+--tf--+--+-+t--ft+-T
0.25
0.20
0.15
0.10
0.05
0.00
0.30
0.25
0.20
0.15
0.10
0.05
0.00
WESTERN PERIMETER
MOZAMBIQUE CHANNEL
+ DISSOLVED ,ORGANIC P
•
~
EAST OF CARLSBERG
©
RIDGE
C . . ~. + ~PARTICULA .r ~E O:GAN ~IC p +
+-.~'
--.-.' --. .
- - - - - - -
.......... +
.. ,
---_...>---+@
. . -
Fig. 16. Distribution of particulate and dissolved organic phosphorus (a, c) and total organic
phosphorus (b, d) in the western Indian Ocean, during the SW monsoon period (a, b) and during the
NE monsoon period (c, d), both sampled by "Atlantis II" expeditions. (Dotted line: 0- 200 m;
broken line: 200-1000 m)
is in marked contrast with the pattern seen in deep water levels for the SW monsoon data.
The maximum concentrations near 20 0 S correspond with the area of maximum productivity at this season, as assessed by chlorophyll distribution data (MCGILL and
LAWSON,1966).