Surface nutrient and chlorophyll analyses were performed on samples collected on board commercial... more Surface nutrient and chlorophyll analyses were performed on samples collected on board commercial container ships from April 2009 through December 2012. Samples were collected from the underway seawater system during basin-wide transects of the North Pacific Ocean while traversing from Hong Kong to Long Beach, California.
Temperature, salinity, fluorescence, and dissolved O2/Ar ratios were measured continuously from a... more Temperature, salinity, fluorescence, and dissolved O2/Ar ratios were measured continuously from an underway seawater system on board commercial container ships OOCL Tianjin and OOCL Tokyo. Measurements were made from May 2011 to August 2012 during basin-wide transects of the North Pacific Ocean while traversing from Hong Kong to Long Beach, CA
Systematic regional variations in the ratio of nutrient depth gradients of dissolved inorganic ca... more Systematic regional variations in the ratio of nutrient depth gradients of dissolved inorganic carbon (ΔDIC):nitrate (ΔNO3):phosphate (ΔPO4) in the upper layer (300 m) of the Pacific Ocean are observed. Regional variations in the ΔDIC/ΔNO3/ΔPO4 are primarily the result of three processes, that is, the C/N/P of organic matter (OM) being exported and subsequently degraded, nitrogen fixation, and air‐sea CO2 gas exchange. The link between the observed dissolved ΔDIC/ΔNO3/ΔPO4 and the C/N/P of exported OM is established using surface layer dissolved DIC, NO3, and PO4 budgets. These budgets, in turn, provide a means to indirectly estimate the C/N/P of OM being exported from the surface layer of the ocean. The indirectly estimated C/N/P of exported OM reach maxima in the subtropical gyres at 177/22/1, that is, significantly greater than the Redfield ratio and a minimum in the equatorial ocean at 109/16/1 with both results agreeing with available observed particle C/N/P and ocean biogeochemical models. The budget approach was applied to a bioactive trace element (TE) using the measured dissolved Cadmium (Cd) to PO4 gradients to estimate the Cd/P of exported OM in the Pacific Ocean. Combining the budget method with the availability of high‐quality dissolved nutrient and TE data collected during the GOSHIP and GEOTRACES programs could potentially provide estimates of the C/N/P/TE of exported OM on global ocean scales which would significantly improve our understanding of the link between the ocean's biological pump and dissolved nutrient distributions in the upper ocean.
Results are presented of measurements of the CO2 concentrations and C-13/C-12 ratios in CO2 in ai... more Results are presented of measurements of the CO2 concentrations and C-13/C-12 ratios in CO2 in air samples collected from within the Amazonian rain forest and over the Amazon river between 1982 and 1987. Results indicate the presence of a diurnal cycle in the CO2 concentration and the C-13/C-12 ratio. It was found that the CO2 input to air in the
Surface nutrient and chlorophyll analyses were performed on samples collected on board commercial... more Surface nutrient and chlorophyll analyses were performed on samples collected on board commercial container ships from April 2009 through December 2012. Samples were collected from the underway seawater system during basin-wide transects of the North Pacific Ocean while traversing from Hong Kong to Long Beach, California.
Temperature, salinity, fluorescence, and dissolved O2/Ar ratios were measured continuously from a... more Temperature, salinity, fluorescence, and dissolved O2/Ar ratios were measured continuously from an underway seawater system on board commercial container ships OOCL Tianjin and OOCL Tokyo. Measurements were made from May 2011 to August 2012 during basin-wide transects of the North Pacific Ocean while traversing from Hong Kong to Long Beach, CA
Systematic regional variations in the ratio of nutrient depth gradients of dissolved inorganic ca... more Systematic regional variations in the ratio of nutrient depth gradients of dissolved inorganic carbon (ΔDIC):nitrate (ΔNO3):phosphate (ΔPO4) in the upper layer (300 m) of the Pacific Ocean are observed. Regional variations in the ΔDIC/ΔNO3/ΔPO4 are primarily the result of three processes, that is, the C/N/P of organic matter (OM) being exported and subsequently degraded, nitrogen fixation, and air‐sea CO2 gas exchange. The link between the observed dissolved ΔDIC/ΔNO3/ΔPO4 and the C/N/P of exported OM is established using surface layer dissolved DIC, NO3, and PO4 budgets. These budgets, in turn, provide a means to indirectly estimate the C/N/P of OM being exported from the surface layer of the ocean. The indirectly estimated C/N/P of exported OM reach maxima in the subtropical gyres at 177/22/1, that is, significantly greater than the Redfield ratio and a minimum in the equatorial ocean at 109/16/1 with both results agreeing with available observed particle C/N/P and ocean biogeochemical models. The budget approach was applied to a bioactive trace element (TE) using the measured dissolved Cadmium (Cd) to PO4 gradients to estimate the Cd/P of exported OM in the Pacific Ocean. Combining the budget method with the availability of high‐quality dissolved nutrient and TE data collected during the GOSHIP and GEOTRACES programs could potentially provide estimates of the C/N/P/TE of exported OM on global ocean scales which would significantly improve our understanding of the link between the ocean's biological pump and dissolved nutrient distributions in the upper ocean.
Results are presented of measurements of the CO2 concentrations and C-13/C-12 ratios in CO2 in ai... more Results are presented of measurements of the CO2 concentrations and C-13/C-12 ratios in CO2 in air samples collected from within the Amazonian rain forest and over the Amazon river between 1982 and 1987. Results indicate the presence of a diurnal cycle in the CO2 concentration and the C-13/C-12 ratio. It was found that the CO2 input to air in the
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Papers by Paul Quay