Dandonneau Yves. (1989). Abnormal bloom of phytoplankton around 10°N in the western Pacific during the 1982-83 ENSO. In :
Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.). Western Pacific international meeting and workshop on Toga Coare : proceedings. Nouméa : ORSTOM, p. 791-801. Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30.
Titre du document
Abnormal bloom of phytoplankton around 10°N in the western Pacific during the 1982-83 ENSO
Année de publication
1989
Type de document
Colloque
Auteurs
Dandonneau Yves
In
Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.)Western Pacific international meeting and workshop on Toga Coare : proceedings
Source
Nouméa : ORSTOM, 1989,
p. 791-801
Colloque
Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30
The chlorophyll concentration at the surface of the tropical Pacific has been monitored through the 1982-83 ENSO, owing to the SURTROPAC ships of opportunity network. The event was characterized by a decrease in chlorophyll concentrations at the equator, where a belt of relatively rich water however persisted. The most striking anomaly was observed in the western Pacific between 5°N and 15°N. In this region, chlorophyll at the surface is generally less than O.O7 mg m-3, caused by a mixed layer exhausted in nutrients and by strong density gradient in the thermocline. From october 1982 to march 1983, higher concentrations up to 0.70 mg m-3 have been recorded by the network. This is consistent with the shallowing of the thermocline which characterizes all ENSO events and was especially well marked in 1982-83. This bloom can be explained by nutrients supplied to the surface mixed layer through the thermocline.
