This CTD and Niskin bottle data set, consisting of 54 casts, was collected in the Chukchi and Bering Sea areas from the F/V Aquila (AQ13-01, August 23 - September 14, 2013) for CHukchi Acoustic, Oceanographic, and Zooplankton (CHAOZ-X) 2013 and ARCWEST Programs. The cruise was funded by DOI Bureau of Ocean Energy Management (BOEM) through the NOAA National Marine Mammal Laboratory. CTD operations on this cruise were managed by EcoFOCI personnel from NOAA/PMEL. Profile data from CTD instruments were processed at NOAA/PMEL/EcoFOCI using standard techniques. Data from bottle samples include phosphate, silicate, nitrate, nitrite and ammonium. Profile data are averaged to a 1-meter grid, with missing data listed as 1e+35. Salinity was calculated (PSS-78), from conductivity and temperature (ITS90). Sigma-t was calculated from primary temperature and salinity. Nutrient samples were analyzed according to the methods of Gordon et al, 1993 and Mantoura, Woodward, 1983 (see references below). Samples were collected in 50 ml high-density polyethylene bottles that were rinsed first with 10% HCl prior to each station, and rinsed at least three times with sample before filling. Some samples were refrigerated for 3-12 hours prior to analysis, and some frozen for later analysis. CTD data contact: Phyllis Stabeno, Peggy Sullivan, Shaun Bell, Calvin Mordy (nutrients). Cruise was conducted and funded by NOAA's National Marine Mammal Laboratory (NMML), Alaska Fisheries Science Center (AFSC), Pacific Marine Environmental Laboratory (PMEL), US Bureau of Ocean Energy Management (BOEM), and Ecosystems & Fisheries-Oceanography (EcoFOCI, a joint research program between AFSC and PMEL). Data are in CSV format, cruise report is in PDF.