Hydrographic, optical, and meteorological parameters measured by R/V Sikuliaq's underway systems during the Northern Gulf of Alaska LTER cruises, 2018 and 2019

This data set is a compilation of several data streams measured by R/V Sikuliaq's underway systems during cruises for the Northern Gulf of Alaska Long Term Ecological Research (NGA LTER) project. These systems were running for the duration of the NGA LTER cruises. The cruises in this dataset include SKQ201810S, from April 18 to May 5, 2018, and SKQ201915S, from June 29 to July 18, 2019. R/V Sikuliaq's underway instrumentation includes a Sea-Bird SBE 45 MicroTSG, a Sea-Bird SBE 38 Temperature sensor, an In-Situ Ultraviolet Spectrophotometer (ISUS), and a Turner Designs C6 Multi-Sensor Platform - all sampling surface seawater from the forward seachest. Meteorological instrumentation includes a WindObserver 70/75 Ultrasonic Anemometer (corrected for ship motion), Vaisala PTU307 Pressure, Humidity, and Temperature Transmitter, Remote Measurements & Research PSP (Precision Spectral Pyranometer), PIR (Precision Infrared Radiometer), and a Biospherical Instruments reference PAR sensor. For this dataset, data from these instruments were combined with navigational and ship orientation measurements from the Kongsberg Seapath 320+ positioning sensor, averaged into 1 minute ensembles, and inspected for major quality issues. Oceanographic and meteorological data were separated into distinct CSV files for each cruise, for 4 files total. A raw version of this data is archived in the Rolling Deck to Repository (R2R), where it is associated with the cruise on which it was colleceted.. 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.