MIRAI MR17-05C absorption coefficient spectrta of colored dissolved organic matter, CDOM (aCDOM)

Last Modified: 2019-09-17
: MR17-05C
: Processed (PI)
Descrete water samples were filtered through 0.2┬Ám pore-sized polycarbonate filter (Whatman nuclepore membrene) with gentle vacuum (< 100mmHg). Filtered samples were kept in a refregirator until analysis on board.
Filtered water sample was placed into 10-cm quartz cell and optical density (OD) was measured using a multibeam spectrophotometer (UV2600, Shimadzu) scanning with 0.5 nm increment from 250 to 800 nm. A baseline correction was conducted by subtracting the OD of Milli-Q water from OD of the sample, and subtracting 5 nm average value around 685 nm, where aCDOM can be assumed to be 0.
OD values were then converted to an absorption using following equation
aCDOM = 2.303 OD / 0.1
where 2.303 is a factor for converting base e to base 10 logarithms and 0.1 is the optical path length (m).
More detailed discription of the measurment is presented in Babin et al (2003, doi:10.1029/2001JC000882).

For Using Data

Toru Hirawake (Hokkaido University)
See Terms and Conditions about constrain of use.
Nishino, S., 2017, R/V Mirai Cruise Report MR17-05C, 209pp., JAMSTEC, Yokosuka, Japan.

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: nishinos@jamstec.go.jp

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).
UV2600 (Shimadzu)
Instrument Information:
Tab separated text fromat.
Filename conventions for aCDOM include a 3 digit code representing an internal water sample number. The file "SampleLog_aCDOM_MR1705C.xlsx" lists corresponding stations and depths for these samples.
: MR17-05C
: Processed (PI)

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