CTD profile time series data from the GAK1 site in the Northern Gulf of Alaska, 1970-2020

The data set contains measurements of temperature and salinity made from CTD casts at the GAK1 oceanographic station in the Northern Gulf of Alaska. Located at the mouth of Resurrection Bay near Seward, Alaska, temperature and salinity versus depth profiles have been taken at GAK1 since December, 1970. This multi-decade time series is one of the longest running oceanographic time series in the North Pacific. This dataset includes a single ASCII-formatted '.dat' file containing CTD profile data 1970-2016. This file provides the code for the cruise that collected the profile, the station number of the GAK1 CTD profile on the cruise that collected the data, the date (in decimal year) of the profile, as well as depth (m), temperature (C), salinity (ppt), seawater density (sigma-t), and delta-D. These data are part of the Northern Gulf of Alaska Long Term Ecological Research (NGA LTER) program. The LTER program is a National Science Foundation–funded network of 28 sites nationwide that focus on the influence of long-term and large-scale phenomenon on ecosystems. Additional funding for sampling is provided by the North Pacific Research Board (NPRB), the Alaska Ocean Observing System (AOOS), and the Exxon Valdez Oil Spill Trustee Council (EVOS) via the Gulf Watch Alaska program.