Dataset: LISST suspended PSDs from Station ALOHA
Deployment: KM1910

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/864934

Principal Investigator:

Angelicque E. White (University of Hawaiʻi at Mānoa)

Co-Principal Investigator:

Sara Ferrón (University of Hawaiʻi at Mānoa)

Erica Goetze (University of Hawaiʻi at Mānoa)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

EAGER Collaborative Research: Early career chief scientist training for biological and chemical oceanographers (Chief Sci KM1910)

Version:

Deployment Synonyms:

EAGER, Chief Sci cruise, 2019 Chief Scientist Training Cruise

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Description

Methods & Sampling

Dataset acquisition description

Particle size distribution (PSD) measurements were made in June 2019 at Station ALOHA (22.75°N, 158°W) in the North Pacific Subtropical Gyre aboard the R/V Kilo Moana (KM1910). PDSs were measured using the Laser In Situ Scatterometer and Transmissometer 100X (Type B, Sequoia Scientific Inc., hereafter LISST) which uses laser diffraction in an approximately 100 ml sample volume to estimate the PSD via inversion into 32 logarithmically spaced particle size classes.

Suspended material PSDs were measured from discrete bottle samples collected using a rosette at 5, 75, and 150 meter depths. PSDs were then measured from the LISST in discrete chamber mode, with twenty diffraction measurements made from each sample. This process was repeated in triplicate. Blank samples were also collected in triplicate to provide the background particle concentrations, using the collected sample blanks. Data were analyzed using the standard spherical particle inversion provided by the LISST manufacturer.

Addtional details on sampling strategy and procedures can be found in Cael & White (2020).

Data Processing Description

Dataset Processing Description

Matlab Code used to analyze all LISST data and to reproduce results of Cael and White (2020) are provided. Detailed information on LISST processing can be found in White et al. (2015).

Raw data are provided in their original formats (.asc, .log, and .psd). Processed data are provided in Matlab format and are divided into subfolders.

The ‘LISST’ folder contains all of the LISST data and code used to process data and reproduce the analysis and figures of Cael and White (2020).
The ‘raw_data’ folder contains all the .asc, .log, and .psd files or .dat files for all of the LISST scans used in the paper (direct outputs of the instrument after samples/scans are run), as well as calibration and ring area files necessary for the LISST inversion, and blank samples collected (applied as in Cael and White, 2020).
The ‘susp_mat_files’ folder contains processed data used in subsequent analyses and includes the individual suspended samples’ PSDs.
The ‘code’ folder includes all code used to process the data using Matlab and make key figures in the paper. ‘lisst_process_susp.m’ shows how raw data were converted into PSDs. ‘getscat.m’, ‘invert.p’, and ‘vdcorr.m’ are the LISST manufacturer proprietary code used to invert data and calculate the PSDs using Matlab.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1911990	NSF Division of Ocean Sciences

Instruments

Niskin bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Sequoia Scientific Laser In-Situ Sediment Size Transmissometer

Supplied Name: Laser In Situ Scatterometer and Transmissometer 100X (LISST Type B, Sequoia Scientific Inc.)

Supplied Description:

Particle Size Distribution measurements were made using the Laser In Situ Scatterometer and Transmissometer 100X (Type B, Sequoia Scientific Inc.). The LISST uses laser diffraction in an approximately 100 ml sample volume to estimate the PSD via inversion into 32 logarithmically spaced particle size classes.

Instrument Type

Generic Name: Sequoia Scientific Laser In-Situ Sediment Size Transmissometer

Acronym: Sequoia LISST

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0044/

Generic Description:

A self-contained unit which measures the scattering of LASER light at a number of angles. This primary measurement is mathematically inverted to give a grain size distribution, and also scaled to obtain the volume scattering function. The size distribution is presented as concentration in each of the grain-size class bins. Optical transmission, water depth and temperature are recorded as supporting measurements.

The Sequoia LISST 100-X series instruments are available in two range sizes: 1.25-250 microns (Type B) and 2.5-500 microns (Type C).

Parameters

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Database

Contribute Data

Dataset: LISST suspended PSDs from Station ALOHA
Deployment: KM1910

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: LISST suspended PSDs from Station ALOHADeployment: KM1910

Dataset acquisition description

Dataset Processing Description

Dataset: LISST suspended PSDs from Station ALOHA
Deployment: KM1910