CTD data from AT39-01 (North Pond 2017 expedition) from the R/V Atlantis in the central North Atlantic during October 2017 (NCEI Accession 0278391)

This dataset contains biological, chemical, optical, and physical data collected on R/V Atlantis during cruise AT39-01 in the North Atlantic Ocean from 2017-10-14 to 2017-10-27. These data include conductivity, density, depth, dissolved Oxygen, fluorescence, salinity calculated from CTD primary sensors, sound velocity, turbidity, water pressure, and water temperature. The instruments used to collect these data include CTD Sea-Bird SBE 911plus, WETStar ECO FLNTU, Wet Labs CSTAR Transmissometer, and Wet Labs ECO-AFL/FL Fluorometer. These data were collected by Dr Grieg Steward of University of Hawaii at Manoa as part of the "Collaborative Research: A multidimensional approach to understanding microbial carbon cycling beneath the seafloor during cool hydrothermal circulation (Subseafloor Microbial Carbon Cycling)", "Collaborative Research: Completing North Pond Borehole Experiments to Elucidate the Hydrology of Young, Slow-Spread Crust (North Pond 2017)", and "Investigation of viruses and microbes circulating deep in the seafloor (North Pond Viruses)" projects and "Center for Dark Energy Biosphere Investigations (C-DEBI)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-03-07.

The following is the text of the dataset description provided by BCO-DMO:

CTD data from AT39-01 (North Pond 2017 expedition)

Dataset Description:
CTD data from AT39-01 (North Pond 2017 expedition)

Cast at3901001 was a test cast. No bottles were fired. Pumps were turned on at a depth of approximately 27 meters. Data above this depth should not be considered valid and were removed before submission. The oxygen sensor encountered at problem at approximately 310 meters on the upcast. Oxygen data should not be considered valid between this depth and the end of the cast at 100 meters. Only the downcast data is provided here.

On cast at3901002, fouling caused intermittent pump operation in the plumbing line between the Temp1, Cond1, and Oxygen sensors. These data were manually replaced with 9.99e-29. Data from Temp2, Cond2, and all other sensors is valid for this cast.

On cast at3901009, a noticeable offset was present in the Oxygen data for the upcast, following a prolonged (12+ hour) deployment. The sensor was cleaned following the cast and values returned to normal on all subsequent casts. Only the downcast data is provided here