Rt€@lll

- l8]
content fnom South-Easl Asian waters towards the Pacific Ocean. In Eastern Archipelago
waters' the avenage phosphate content varies from 0.2 to 0.1 pq/l in the north monsoon and
increase to 0. 1 - 0.4 pq/l in the south monsoon, parlly owing to upwelling in lhe Banda Sea.
In both the Java Sea and the South China Sea, the average phosphate contenl is between 0.1
and 0.2 pg/l in the north monsoon and beLween 0.2 and 0.] ttS/t in the south monsoon.
Figures 9 and I0 show the avenage surface primary producbivity, or the raLes of
organic canbon production expressed in micrograms per cubic meter pen hour, in South-East
Asian wat.ers dunlng the north and the south monsoons, respectively. They are conslructed
from rather limited and unevenly distributed data, and should be considered as preliminary, to
be improved when more complete dat.a are available. Genenally, the coastal and shallow
watens show high rates of organic producLion (over 1.0 microgram per cubic metre per hour)
of organic production, mainly owing to nutrient enrichment from rivers and from the bottom
nesulting from mixing. In deep seas, high rates can only be attributed to upwelling, such as
that occurring during the south monsoon in the Banda Sea and Lhe Arafura Sea, the Indian
Ocean south of Java. and the Lesser Sunda Islands.
Conclusion
Il is obvious that the above assessment is a very general one. Al best it covers only
the most general oceanographic features of the South-EasL Asian waters. There are still many
more feat,ures that are not assessed in this paper. For more detailed information readers
should consult the references below or request data and informalion directly from the
existing regional or international data centres, zuch as Westenn Pacific Data Center, c/o
Japan National Data Center in Tokyo, Japan, or the World Data Center in Washington, D.C.,
USA.
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