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A comparison of in situ and simulated in situ methods for estimating oceanic primary production
Authors:Lohrenz  Steven E; Wiesenburg  Denis A; Rein  Charles R; Arnone  Robert A; Taylor  Craig D; Knauer  George A; Knap  Anthony H
Institution:Center for Marine Science, University of Southern Mississippi Stennis Space Center, MS 39529, USA 1Geochemical and Environmental Research Group, Texas A&M University College Station, TX 77843, USA 2Naval Oceanographic and Atmospheric Research Laboratory Stennis Space Center, MS 39529, USA 3Biology Department, Woods Hole Oceanographic Institution Woods Hole, MA 02543, USA 4Bermuda Biological Station for Research, Inc. 17 Biological Lane, Ferry Reach GE01, Bermuda
Abstract:Primary production data measured by in situ (IS) and ‘simulated’in situ (SIS) incubations were compared. To minimize differencesbetween the two types of incubations, SIS experiments were conductedin temperature-controlled incubators in which the spectral distributionand irradiance were adjusted to approximate IS conditions. ISavailable irradiance (IIs) was computed from vertical attenuationof integrated surface irradiance. Vertical attenuation was estimatedusing a spectral irradiance model, validated by measured profilesof the vertical attenuation coefficient. IS incubations werecarried out using two methods. The first involved deploymentof bottles on a drifting array for whole-day (dawn to dusk)incubations. The second method employed an autonomous submersibleincubation device that performed short term (<1 h) incubationsat multiple depths. Differences between whole-day IS and SISincubation estimates were attributed partially to differencesbetween IIS and SIS-available irradiance (ISIS). Photosynthesis-irradiance(P-I) properties of IS and SIS populations from the whole-dayincubations were not significantly different. P-I propertiesof the short-term IS and SIS populations were significantlydifferent, although estimates of PB (mg C mg Chl–1 h–1)from contemporaneous IS and SIS incubations did not differ by>40%. Integrated water-column primary production (IPP) estimatedusing P-I models derived from SIS data were within 15% of ISestimates of IPP.
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