Table of Contents

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

Sampling and analytical procedures:

Particulates were collected using in situ pumps (25, 45, 75, 100, 125, 150, 225, and 300 m ocean depth) aboard the RV Kilo Moana. Pump heads were loaded with an acid-washed 51um nitex mesh screen as a pre-filter followed by a combusted (4.5hrs 450 degrees C) 142mm GF75 (Advantec nominal pore size 0.3um). An adjacent pump head was loaded with a 52um Sefar filter. Additional 142mm GF75 filters were placed in cages and secured to the side of pumps during deployments and served as wet blanks for PC, POC, PIC, PN analysis. Filters were subsampled with a metal cork borer of known area, folded (active side in), and stored in clean (combusted) foil at -20 degrees C until analysis. The 0.3 to 51um size fraction samples analyzed at Princeton (subsample IDs “m1” and “m2”) and MBL labs (subsample ID “z”) were not acidified so PC and d13C represent total C; subsamples analyzed at WHOI for POC were acidified (subsample IDs “q” (small size fraction 0.3 to 51um) and “r” (large size fraction >51um). Subsamples were oven dried overnight at 55-60 degrees C then packed in 9x11 tin capsules for analysis on EA IRMS. Additional subsamples were analyzed for PIC at WHOI (subsample IDs “p” (small size fraction 0.3 to 52um) and “y” (large size fraction >52um)). PIC samples were stored frozen (-20C) on the ship and dried at 60C for 6-8h on shore, stored in 47mm petri dishes. Filters were analyzed roughly 2 months after collection following established procedures (Dong et al., 2019, Subhas et al., 2019).

Problem report:

Large particle (>51 micron) PIC data was not collected at 100m because that filter was allocated for other measurements.  Mass of N on subsample was too low for 15N measurement at 225 m and 300 m. Filter subsample “z” was only collected at one depth (25 m).

BCO-DMO Processing:

- converted date_HST to YYYY-MM-DD format;
- created UTC date/time field in ISO8601 format.

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.