Interactive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
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Response: In fact the introduction hypothesizes but does not “assume” that SCM have a large role in new water-column primary production. This hypothesis was formulated on the basis of recent observations published in Martin et al. 2010. These authors characterized Arctic SCM and compared them with those of warmer oceans. The comparison revealed striking differences between these oceans and the Arctic. In the latter, SCM are located relatively high in the euphotic zone, occur at or near the nitracline, and correspond to maxima of phytoplankton biomass (whereas in tropical oceans the SCM is at the bottom or below the euphotic zone, above the nitracline, and does not correspond to a maximum of phytoplankton biomass). For these reasons one cannot take for granted that the SCM and the vertical maximum of nitrate uptake do not match in the Arctic Ocean.
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Interactive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
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Interactive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
This manuscript assumes that subsurface chlorophyll maxima (SCM) in the Canadian Arctic waters have a large role in new production in the water columns, and reports nutritive and photosynthetic characteristics of the SCM. However, vertical maximum of nitrate uptake rate does not occur at SCM in oligotrophic tropical and subtropical oceans (e.g. Raimbault et al., 1999; Aufdenkampe et al., 2002; ...
متن کاملInteractive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
This manuscript assumes that subsurface chlorophyll maxima (SCM) in the Canadian Arctic waters have a large role in new production in the water columns, and reports nutritive and photosynthetic characteristics of the SCM. However, vertical maximum of nitrate uptake rate does not occur at SCM in oligotrophic tropical and subtropical oceans (e.g. Raimbault et al., 1999; Aufdenkampe et al., 2002; ...
متن کاملInteractive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
1) Comment: General Comments: The manuscript presents an extensive analysis of 13C, NO3 and NH4 -uptake versus irradiance experiments for the Arctic subsurface chlorophyll maxima (SCM). NO3 and NH4 – uptake versus irradiance experiments are rarely conducted alongside traditional “P vs E” curves, so the paper includes some novel information on the rates of NO3 and NH4 uptake compared to carbon f...
متن کاملInteractive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
1) Comment: General Comments: The manuscript presents an extensive analysis of 13C, NO3 and NH4 -uptake versus irradiance experiments for the Arctic subsurface chlorophyll maxima (SCM). NO3 and NH4 – uptake versus irradiance experiments are rarely conducted alongside traditional “P vs E” curves, so the paper includes some novel information on the rates of NO3 and NH4 uptake compared to carbon f...
متن کاملInteractive comment on “Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in the Canadian Arctic waters” by J. Martin et al
General Comments: The manuscript presents an extensive analysis of 13C, NO3 and NH4 -uptake versus irradiance experiments for the Arctic subsurface chlorophyll maxima (SCM). NO3 and NH4 – uptake versus irradiance experiments are rarely conducted alongside traditional “P vs E” curves, so the paper includes some novel information on the rates of NO3 and NH4 uptake compared to carbon fixation for ...
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