Woods Hole Oceanographic Institution

Rachel Stanley

»Hotspots of Productivity and Respiration
»Helium Flux Gauge
»Patchiness in Net Community Production
»Arctic Ocean Primary Productivity
»Noble Gases in Seawater
»Microphytobenthos Photosynthesis
»Apparent Oxygen Utilization Rates
»Biological Production in Western Equatorial Pacifific
»Improved Air-Sea Gas Exchange Parameterization
»Measuring Noble Gases
»Design Experiment: Air-Sea Gas Exchange
»Neutrally Buoyant Sediment Traps
»Tritium in Trees
»Heavy Metals in Trees
»Clumping of Oligonucleotides


Rachel H. R. Stanley, Scott C. Doney, William J. Jenkins, and Dempsey E. Lott, III


Apparent oxygen utilization rates calculated from tritium and helium-3 profiles at the Bermuda Atlantic Time-series Study site

, Biogeosciences doi:10.5194/bg-9-1969-2012, 9977-10015, 2012

We present three years of Apparent Oxygen Utilization Rates (AOUR) estimated from oxygen and tracer data collected over the ocean thermocline at monthly resolution between 2003 and 2006 at the Bermuda Atlantic Time-series Study (BATS) site. We estimate water ages by calculating a transit time distribution from tritium and helium-3 data. The vertically integrated AOUR over the upper 500 m, which is a regional estimate of export, during the three years is 3.1 ± 0.5 mol O2 m-2 y-1. This is comparable to previous AOUR-based estimates of export production at the BATS site but is several times larger than export estimates derived from sediment traps or 234Th fluxes. We compare AOUR determined in this study to AOUR measured in the 1980s and show AOUR is significantly greater today than decades earlier because of changes in AOU, rather than changes in ventilation rates. The changes in AOU may be a methodological artefact associated with problems with early oxygen measurements.

Stanley et al 2012 paper on Apparent Oxygen Utilization Rates at BATS

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