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Tortell, Philippe Daniel; Trimborn, Scarlett; Li, Y; Rost, Bjoern; Payne, Christopher D (2010): (Table 1) Biological and chemical characteristics of surface water stations during Nathaniel B. Palmer cruise NBP06-08 to the Ross Sea. doi:10.1594/PANGAEA.858519,
Supplement to: Tortell, PD et al. (2010): Inorganic carbon utilization by Ross Sea phytoplankton across natural and experimental CO2 gradients. Journal of Phycology, 46(3), 433-443, doi:10.1111/j.1529-8817.2010.00839.x

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Abstract:
We present results from a field study of inorganic carbon (C) acquisition by Ross Sea phytoplankton during Phaeocystis-dominated early season blooms. Isotope disequilibrium experiments revealed that HCO3? was the primary inorganic C source for photosynthesis in all phytoplankton assemblages. From these experiments, we also derived relative enhancement factors for HCO3?/CO2 interconversion as a measure of extracellular carbonic anhydrase activity (eCA). The enhancement factors ranged from 1.0 (no apparent eCA activity) to 6.4, with an overall mean of 2.9. Additional eCA measurements, made using membrane inlet mass spectrometry (MIMS), yielded activities ranging from 2.4 to 6.9 U/[?g chl a] (mean 4.1). Measurements of short-term C-fixation parameters revealed saturation kinetics with respect to external inorganic carbon, with a mean half-saturation constant for inorganic carbon uptake (K1/2) of ~380 ?M. Comparison of our early springtime results with published data from late-season Ross Sea assemblages showed that neither HCO3? utilization nor eCA activity was significantly correlated to ambient CO2 levels or phytoplankton taxonomic composition. We did, however, observe a strong negative relationship between surface water pCO2 and short-term 14C-fixation rates for the early season survey. Direct incubation experiments showed no statistically significant effects of pCO2 (10 to 80 Pa) on relative HCO3? utilization or eCA activity. Our results provide insight into the seasonal regulation of C uptake by Ross Sea phytoplankton across a range of pCO2 and phytoplankton taxonomic composition.
Coverage:
Median Latitude: -74.141806 * Median Longitude: 175.817338 * South-bound Latitude: -77.449900 * West-bound Longitude: 169.598000 * North-bound Latitude: -63.395000 * East-bound Longitude: -173.538000
Date/Time Start: 2006-11-08T00:00:00 * Date/Time End: 2006-12-08T00:00:00
Minimum DEPTH, water: m * Maximum DEPTH, water: m
Event(s):
NBP0608_SW14 * Latitude: -77.001700 * Longitude: 174.046900 * Date/Time Start: 2006-11-08T00:00:00 * Date/Time End: 2006-12-08T00:00:00 * Location: Ross Sea * Campaign: NBP06-08 (CORSACS II) * Basis: Nathaniel B. Palmer * Device: Surface water sample (SWS)
NBP0608_SW20 * Latitude: -76.301100 * Longitude: 173.299600 * Date/Time Start: 2006-11-08T00:00:00 * Date/Time End: 2006-12-08T00:00:00 * Location: Ross Sea * Campaign: NBP06-08 (CORSACS II) * Basis: Nathaniel B. Palmer * Device: Surface water sample (SWS)
NBP0608_SW21 * Latitude: -76.300100 * Longitude: 169.598000 * Date/Time Start: 2006-11-08T00:00:00 * Date/Time End: 2006-12-08T00:00:00 * Location: Ross Sea * Campaign: NBP06-08 (CORSACS II) * Basis: Nathaniel B. Palmer * Device: Surface water sample (SWS)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventTortell, Philippe Daniel
2Latitude of eventLatitudeTortell, Philippe Daniel
3Longitude of eventLongitudeTortell, Philippe Daniel
4Depth, top/minDepth topmTortell, Philippe Daniel
5Depth, bottom/maxDepth botmTortell, Philippe Daniel
6DEPTH, waterDepth watermTortell, Philippe DanielGeocode
7Chlorophyll aChl aµg/lTortell, Philippe Daniel
8NitrateNO3µmol/lTortell, Philippe Daniel
9Dominant species of live faunaDom spec lTortell, Philippe Danielfor phytoplankton
10Carbon dioxide, partial pressurepCO2PaTortell, Philippe Daniel
11Silicon dioxideSiO2µmol/lTortell, Philippe Daniel
Size:
108 data points

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