Influence of the El Nino-La Nina cycle on satellite-derived primary production in the California Current

被引：49
|
作者：
Kahru, M [1 ]
Mitchell, BG [1 ]
机构：
[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2002年 / 29卷 / 17期
关键词：
D O I：
10.1029/2002GL014963
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
[1] Time series of phytoplankton net primary production (NPP) for the California Current were derived using satellite data and the VGPM primary productivity model for a 5-year period (1997-2001) including the 1997-98 El Nino. NPP had a strong annual periodicity correlated with the El Nino-La Nina cycle. The most obvious effects of the El Nino on NPP were 100-300 km off the coast: a reduction by 30% off Southern California but an increase by 40% off Baja California. During its peak El Nino decreased NPP by 10-15% (1.5 Tg C month(-1)) in the 1000-km band off Southern California but increased by 20-30% off Northern and Southern Baja (4 Tg C month(-1)). The total annual NPP was lowest during the El Nino years of 1997-1998 and peaked in 2000. Trends of increasing NPP and zooplankton volume were observed off Central and Southern California.
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