Spatial and temporal variabilities of the chlorophyll distribution in the northeastern tropical Pacific: The impact of physical processes on seasonal and interannual time scales

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• 作者：Yoshikazu Sasai^a ; ^{ysasai@jamstec.go.jp} ; Kelvin J. Richards^b ; Akio Ishida^a ; Hideharu Sasaki^c
• 关键词：Chlorophyll ; Northeastern Tropical Pacific ; Physical processes ; Seasonal and interannual scale ; Eddy-resolving physical&ndash ; biological model
• 刊名：Journal of Marine Systems
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：96-97
• 期：Complete
• 页码：24-31
• 全文大小：4285 K

文摘

A global eddy-resolving coupled physical-biological model is used to investigate the seasonal and interannual variabilities of the chlorophyll in the northeastern tropical Pacific during 2000-2007. The seasonal variability of the surface chlorophyll concentration in the model agrees well with satellite ocean color data, except for the equatorial region. High chlorophyll levels off the Gulf of Tehuantepec, Papagayo, and Panama in winter and in the Costa Rica Dome in summer are well reproduced. Production in these areas is controlled by the supply of nitrate rich-waters through vertical mixing and coastal and open ocean upwelling. The variability of the thermocline depth is strongly connected to the seasonal variability of surface chlorophyll. El Ni?o Southern Ocean (ENSO) variability has a marked effect on the marine ecosystem. The model reproduces the variability of chlorophyll corresponding to the observed ENSO variability. During cold SST anomaly phases (2000, 2001 and 2007), the chlorophyll concentration is considerably higher than other years (2002-2006). Chlorophyll variance is largest off the Gulf of Papagayo and over the Costa Rica Dome where the changes to chlorophyll levels are related to changes in the supply of nitrate rich-waters through vertical mixing and upwelling.