Seawater chemistry and physical property profiling using CDT casts above two seafloor pockmarks on the Miami Terrace offshore of southeastern Florida, 2016

In the Atlantic Ocean and above the Miami Terrace off southeastern Florida, a total of nine CTD (conductivity, temperature, and depth) casts were performed using the 115-foot Research Vessel (R/V) Weatherbird II above the submerged Miami Terrace at the Miami pockmark and Key Biscayne pockmark from May 4 to May 8, 2016. A CTD is a package of electronic instruments and sampling devices that measure conductivity, temperature, and depth but also capable of measuring multiple chemical and physical parameters of the seawater column. A CTD cast measures the various seawater parameters while the package is lowered and raised in one or more cycles from onboard a ship as it drifts with an ocean current or steams along a predetermined transect. Three casts were performed at Miami pockmark and six at Key Biscayne pockmark: Cast 1 CTD - Miami pockmark, Cast 2 CTD - Key Biscayne pockmark, Cast 3 CTD - Miami pockmark, Cast 4 CTD - Miami pockmark, Cast 5 CTD - Key Biscayne pockmark, Cast 6 CTD - Key Biscayne pockmark, Cast 7 CTD - Key Biscayne pockmark, Cast 8 CTD - Key Biscayne pockmark, and Cast 9 CTD - Key Biscayne pockmark. In addition to conductivity, temperature and depth the following parameters were also measured: oxygen, salinity, nitrogen, turbidity, sound velocity, specific conductance, density, fluorescence. The archived water quality data files, navigation files, and detailed metadata for CTD casts can be downloaded from https://doi.org/10.5066/P9VPA5DW.