2013 Hydgrographic, chlorophyll and CDOM fluorescence, and optical backscattering data collected using an Acrobat towed profiler

This data set contains the Acrobat files collected along transects conducted near Barrow, AK from August 20 - 29, 2013. Details of the latitude, longitude, date, and time are listed in the event log that is archived at this site. Date /time (Universal Coordinated Time (UTC) day, decimal time), time, position, bottom depth, and measured variables are listed as separate columns in each file. Each Acrobat file is named according to the transect line sampled, the year, and the year day of data collection (e.g., line_2_2013_232.dat). The Acrobat data acquisition system failed prior to a second occupation of Line 2 and thus could not be used. Data were collected from the research vessel R/V Annika Marie using an Acrobat (Sea Sciences Inc.) towed undulating vehicle equipped with a SeaBird SBE49 conductivity-temperature-depth (CTD) sensor, a Wetlabs EcoTriplet with chlorophyll and Colored dissolved organic matter (CDOM) fluorescence and optical backscatter sensors, and a Wetlabs data logger system. Data were acquired in real time from near-surface (1-m) to a few meters off of the bottom or to a maximum depth of 60 m. The inter-profile distance was usually ~150 m over the shelf and ~1 km seaward of the shelf break. The CTD was calibrated pre-cruise. If desired, the chlorophyll from the fluorometer can be corrected to align with extracted chlorophyll using the relationship: Y=1.0571X+0.1229, R2=0.85 where X is the chlorophyll from the Acrobat fluorometer and units are in µg/L. The WetLabs software that calculates density from the observed temperature and conductivity cannot do so at temperatures below 0 degrees Celsius and a value of -999.999 is returned. Therefore users of these data should re-calculate density. Units of chlorophyll and CDOM are µg/L. For optical backscattering, the particulate volume scattering coefficient at 117 degrees and 660 nm with the scattering of water at 117 degrees subtracted out is shown.