POC was measured with a method consistent with the JGOFS protocols. Particles were collected on pre-combusted 25 mm GF/F filters. After filtration, the filters were transferred to clean glass scintillation vials, dried at 55 degC, and stored until post cruise analysis. The determination of POC was made with a standard CHN analysis based on high temperature combustion of sample filters. The CHN analysis was made at the UCSB MSI Analytical Lab. Before this analysis, 0.25 mL of 10% HCl was applied to each filter for the removal of inorganic carbon and the acid-treated filters were dried at 55 degC. Blank filters were also collected during the cruise to quantify background POC. The blank filters were processed in the same way as regular sample filters with the exception that the sample filtration step was not applied. The final values of POC concentration were calculated by subtracting the mass of organic carbon on blank filters from the mass of carbon determined on sample filters, and then dividing this result by the measured volume of filtered sample. Duplicate POC filters were taken for many samples and averaged to produce the final POC concentration. In addition to POC, particulate organic carbon (PON) was also determined from the CHN analysis. Both POC and PON data are included in the submitted data file.
Upon consultation in advance with the chief of investigation and the person(s) in charge of research issues who gathered that data, we request that the text of the results material contain a statement to the effect that it was obtained during the R/V Mirai cruise of MR17-05C, the Chief Scientist, Shigeto Nishino (JAMSTEC), and the following Principal Investigators (PIs) for gathering the data.
Chief Scientist Shigeto Nishino Japan Agency for Marine - Earth Science and Technology (JAMSTEC) 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan Tel: +81-46-867-9487, Fax: +81-46-867-9437 E-mail: email@example.com
PI Toru Hirawake (Hokkaido Unviersity)
Please also mention that this cruise was supported by the Arctic Challenge for Sustainability (ArCS) Project, which was funded by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT), and the Global Change Observation Mission-Climate (GCOM-C) mission of Japan Aerospace Exploration Agency (JAXA).
CEC 440HA Elemental Analyzer (Exeter Analytical)
Station times and locations are given in the file "SIO_StationLog_MR17-05C.txt".