Photosynthetic parameters in the western equatorial Pacific

Takeshi Kawano; Hirofumi Okano; Ai Yasuda; Kazuhiko Matsumoto; Ichio Asanuma; Marlon R. Lewis

doi:10.1117/12.411676

5 January 2001 Photosynthetic parameters in the western equatorial Pacific

Takeshi Kawano, Hirofumi Okano, Ai Yasuda, Kazuhiko Matsumoto, Ichio Asanuma, Marlon R. Lewis

Proceedings Volume 4154, Hyperspectral Remote Sensing of the Ocean; (2001) https://doi.org/10.1117/12.411676
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

Measurements of 'Photosynthesis versus Irradiance' were conducted at 9 stations along the Equator from 145 degrees East to 170 degrees West in December 1999. Samples were obtained at about from the surface and chlorophyll maximum layer. The samples were inoculated with C-13 and incubated for 3 hours in a temperature controlled linear incubator which has 8 light levels. The P-I equation of Platt et al. is employed to calculate the initial slope, Pmax and the saturation parameters. It was La-Nina condition in this period and the influence of 'cold-tongue' came over around 160 degree East. Pmax varied from 1.7 to 4.7 (gC/gChl/h) on the surface. The minimum value of Pmax on the surface was observed at 160 degree East. The value increased gradually to the east and also to the west. On the other hand, the initial slope does not change so much and we cannot see such an east-west variability as Pmax. As it has been pointed out in previous studies, Pmax and the saturation parameter tend to decrees with depth and the initial slope tends to be lower near the surface.

Citation Download Citation

Takeshi Kawano, Hirofumi Okano, Ai Yasuda, Kazuhiko Matsumoto, Ichio Asanuma, and Marlon R. Lewis "Photosynthetic parameters in the western equatorial Pacific", Proc. SPIE 4154, Hyperspectral Remote Sensing of the Ocean, (5 January 2001); https://doi.org/10.1117/12.411676

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