Papers by Saul Álvarez-Borrego
During June 17-28, 1982, we carried on experiments to generate photosynthesis-irradiance curves f... more During June 17-28, 1982, we carried on experiments to generate photosynthesis-irradiance curves for phytoplankton from five locations of the central and northern Gulf of California. Using natural sunlight, on board 14C incubations were done with samples collected from five different depths within the euphotic zone. In general there were great vertical changes of variables controlling primary productivity, even in cases where weak vertical TOC gradients indicated high instability and mixing of the euphotic zone. The assimilation number (PBm) had a two fold variation within the mixed layer. In general PBm decreased monotonically with depth due to phytoplankton conditioning to lower irradiances. Surface PBm values had a range of 8 to 15mg C. mg Chl a- 1. h-1. When a thermocline was present, PBm for the bottom of the euphotic zone was about 4 to 10% of that for surface waters. But, without a thermocline, P~ for the bottom of the euphotic zone was ~ 60% of that for surface waters, due to...
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Journal of Geophysical Research, 1994
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Books by Saul Álvarez-Borrego
Los desafíos que enfrenta la humanidad ante el calentamiento climático global hacen necesario y u... more Los desafíos que enfrenta la humanidad ante el calentamiento climático global hacen necesario y urgente entender los ecosistemas desde un punto de vista funcional. En esta perspectiva se preve que los ciclos biogoequímicos de los principales elementos de la vida (carbono, nitrógeno, fósforo o azufre) sean afectados. En este capítulo se resume la información sobre el conocimiento y los posibles impactos sobre los ciclos biogeoquímicos en México.
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Papers by Saul Álvarez-Borrego
Books by Saul Álvarez-Borrego