<div><p>Multiple deployments of two Sea-Bird Scientific Navis BGCi floats (numbers F033 and F034) equipped with CTDs, transmissometers, O2 optodes, backscattering (700 nm), fluorescence (chlorophyll, colored dissolved organic matter), and tilt sensors were conducted between July 2013 and November 2014 in conjunction with Bermuda Atlantic Time-series Study cruises. Short-term deployments (1.5 – 3 days) followed by recovery of the floats were conducted during four monthly BATS cruises in July – October 2013 and one cruise in March 2014. Both floats were deployed during the July and August 2013 cruises and float F034 was deployed for the remaining cruises. Each float collected one profile per cruise with the exception of the August 2013 cruise, during which the two floats together collected 13 profiles. During short-term deployments, floats first completed an initial descent and ascent without parking, then completed 1 or 2 more profile cycles with different, consecutive target depths. Following the initial descent/ascent described above, the short-term profile cycles were structured as described below for long-term deployments. In addition to the short-term cruise deployments, F033 profiled continuously from October 2013 until early April 2014, yielding 77 profiles, and F034 profiled continuously from March 2014 until late November 2014, yielding 139 profiles. During these long-term deployments, a typical cycle consisted of 1) the descent to the target park depth, 2) a park phase at the target depth lasting 1.5 – 2.5 days during which measurements are made every 15 minutes, 3) a descent to 1000 dbar, 4) an ascent to the surface during which measurements are made, and 5) a surface telemetry phase, during which a GPS fix is obtained, data are uploaded via Iridium, and instructions for the next cycle are downloaded. During long-term deployments, floats cycled through park phases at 150/200, 300, 500, and 1000 dbar every 7 days, spending 2.5 days at 1000 dbar and 1.5 days at the shallower depths. The sequence of park phase depth at the three shallowest depths was varied between each 7-day cycle over a 21-day period to avoid aliasing in particle flux profiles.</p>
<p>A float firmware error early in the project prevented collection of upper water column data in some of the short-term deployments. This was remedied before long-term deployment of the floats commenced. The floats occasionally performed a reboot during ascent profiles. The affected profiles are missing data for some pressure bins. Colored dissolved organic matter data are not available for float F034 profiles from cruises B295 and B296 due to sensor malfunction.</p>
<p>Profile data were acquired during the ascent to the surface following each park phase acquisition at a sampling rate of 4 dbar below 500 dbar and 2 dbar above 500 dbar.</p></div>
Float profile data collected during surface ascent.
<div><p><span style="color:rgb(0, 0, 0); font-family:calibri,sans-serif; font-size:14.6667px">Float profile data collected during surface ascent.</span></p></div>
Profile data
<div><p><span style="font-size:14px"><strong>BCO-DMO Data Processing Description:</strong></span></p>
<p><span style="font-size:14px"><span style="color:rgb(0, 0, 0); font-family:helvetica,arial,sans-serif">-Reformatted date to </span></span><span style="color:rgb(0, 0, 0); font-family:helvetica,arial,sans-serif; font-size:14.4px"><span style="font-size:14px">yyyy</span></span><span style="font-size:14px"><span style="color:rgb(0, 0, 0); font-family:helvetica,arial,sans-serif">/mm/dd</span><br /><span style="color:rgb(0, 0, 0); font-family:helvetica,arial,sans-serif">-Reformatted column names to comply with BCO-DMO standards.</span><br /><span style="color:rgb(0, 0, 0); font-family:helvetica,arial,sans-serif">-Added ISO_DateTime_UTC column.</span><br /><span style="color:rgb(0, 0, 0); font-family:helvetica,arial,sans-serif">-Data were originally organized into multiples files and have been consolidated for display here.</span></span></p></div>
728347
Profile data
2018-02-26T15:19:57-05:00
2018-02-26T15:19:57-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:728347
Float profile data collected during surface ascents in the Sargasso Sea from 2013-2014.
Optical proxy measurements of sinking particle flux and water-column bio-optical profiles were obtained from profiling floats in the Sargasso Sea to expand the number of particle flux observations in the critical and under-sampled “twilight zone”. Particulate organic carbon flux derived from float-based optical sediment trap measurements was validated against fluxes measured directly with co-deployed, drifting neutrally-buoyant, sediment traps during a series of five short cruises before floats were deployed for approximately one year. The data returned by the floats comprise quantitative particle flux observations made at high-enough temporal resolution to interpret in the context of short-term, upper-ocean production events.
false
Estapa, M., Buesseler, K. (2018) Float profile data collected during surface ascents in the Sargasso Sea from 2013-2014. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version working) Version Date 2018-04-17 [if applicable, indicate subset used]. doi:10.1575/1912/bco-dmo.734339 [access date]
true
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10.1575/1912/bco-dmo.734339
false
Biological pump
Carbon flux
BATS
Neutrally-Buoyant Sediment Trap
Optical sediment trap
2018-04-17
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