Dl. Tang et al., ANALYSIS OF ANNUAL AND SPATIAL PATTERNS OF CZCS-DERIVED PIGMENT CONCENTRATION ON THE CONTINENTAL-SHELF OF CHINA, Continental shelf research, 18(12), 1998, pp. 1493
The combination of a population of more than 1.2 billion people in Chi
na, Taiwan and Hong Kong and recent rapid industrialization has placed
a very heavy burden on the region's coastal environment. Algal blooms
and red tides pose a serious threat to public health. fisheries and t
he aquaculture industry. Consequently, a thorough examination of the t
emporal variations in phytoplankton pigment concentrations in coastal
water on a large scale is necessary. This study examined the annual an
d geographic variations of pigment concentration on the continental sh
elf of China from 1978 to 1986. All the available Coastal Zone Color S
canner (CZCS) images (2139 scenes) from the Nimbus satellite were scre
ened and examined. A total of nine annual composite images were genera
ted. Annual average pigment concentrations were then examined for thre
e transects along the shelf Significant geographic variation of pigmen
t concentrations was revealed. A distinctive high concentration belt o
f about 50 km wide exists along the coastline of China, and a large pl
ume of high pigment concentration was observed to extend nearly 500 km
to the east from the Yangtze River. This plume merged with high pigme
nt concentration water along the coast of the yellow Sea. A basin-wide
gyre rotating clockwise appeared in the center of the Yellow Sea in 1
986. Pigment concentrations were high in the Yellow Sea (about 1-2 mg
m(-3)) and decreased seawards and southeastwards with a minimum value
in the Philippine Sea (about 0.2 mg m(-3)). Interannual variation in t
he study area was also revealed. Annual pigment concentration reached
a peak in 1981. Generally, annual pigment concentrations were relative
ly higher and more variable in the inner shelf and in the northern are
a whereas they were lower and less variable in the outer shelf and in
the southeast region. (C) 1998 Elsevier Science Ltd. All rights reserv
ed.