Table of Contents

• Coverage
• Dataset Description
  • Methods & Sampling
  • Data Processing Description
• Data Files
• Related Publications
• Parameters
• Instruments
• Deployments
• Project Information
• Funding

The CTD rosette package consisted of a 24-place carousel and an aluminum rosette frame equipped with 24 12-L PVC bottles. The CTD and rosette were deployed on a 3-conductor cable (0.322 cm) collecting data at 24 Hz. Raw data were stored on both a shipboard server and laptop computer.

The CTD rosette was equipped with: SeaBird CTD (conductivity, temperature, depth),  SeaPoint chlorophyll fluorometer, SBE dissolved oxygen, beam tranmissometer (C-star) and PAR sensor.

CTD data were processed and quality controlled following Hawaii Ocean Time-series protocols.

CTD data were quality controlled and screened for spikes when the CTD rosette speed was less than 0.25 m s-1 or its acceleration was greater than 0.25 m s. Data were averaged into 2 dbar pressure bins.

CTD-based dissolved oxygen measurements were calibrated to discrete oxygen samples measured on the ship by Winkler titration. Discrete bottle oxygen samples were collected and analyzed using a computer-controlled potentiometric end-point titration procedure. Precision of the Winkler titration method averages ~0.2%. The calibration procedure consists of fitting a non-linear equation to the CTD oxygen current and oxygen temperature.

Similarly, the SeaPoint fluorescence measurements were calibrated, post-cruise, to discrete bottle samples collected from selected hydrocasts. CTD sensor drift was corrected via calibration with bottle fluorometric chlorophyll a plus accessory pheopigments analyzed at the shore based laboratory using a Turner Designs Model 10-AU fluorometer. A linear relationship of the form, Vchl = b·Vfluor + a, was used to convert all fluorescence data to chloropigment.

BCO-DMO Processing Description:

* Merged all individual CTD files
* Combined CTD files with the eventlog, adding the latitude, longitude, times, cast number, station number and event number.
* Converted times to ISO format and Zulu times (HST to UTC time).
* Adjusted column names to comply with database requirements.

NSF Award Abstract:

Intellectual Merit
The PIs request funds to provide training in leading and organizing research cruises to early career researchers in the areas of Biological and Chemical Oceanography. Participants in this training program would be introduced to pre-cruise planning and logistics, receive training in commonly used oceanographic sampling equipment, and conduct shipboard measurements during a 10-day oceanographic cruise to the North Pacific Subtropical Gyre (NPSG). The goal of this training program is to prepare early career scientists for leading and participating in interdisciplinary oceanographic research at sea.

Broader Impacts
The proposed program addresses the broader impacts criteria successfully. The research cruise and follow-up reports and publications focus on interdisciplinary questions important for advancing the field. Given the rapid changes that oceanic systems are undergoing, it is important to have a cadre of junior scientists who are adept at managing interdisciplinary collaborations and conducting research at sea. The PIs are considering ways to connect with diverse audiences in recruiting participants. The impact on early career oceanographers will be very strong. This will create an experience that will be a major impact on the careers of the trainees, especially if they stay in the oceanography field.