| Contributors | Affiliation | Role |
|---|---|---|
| Blough, Neil V. | University of Maryland - College Park (UMD) | Principal Investigator, Contact |
| Del Vecchio, Rossana | University of Maryland - College Park (UMD) | Co-Principal Investigator |
| York, Amber D. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
This dataset has been submitted to BCO-DMO and is in the process of being served.
Related Datasets:
CTD profiles: https://www.bco-dmo.org/dataset/734763
TOC: https://www.bco-dmo.org/dataset/735956
Water samples were collected using a CTD rosette with Niskin bottles and immediately transferred into acid rinsed carboys (20 L). Samples were then filtered through a 0.2 mm maxi capsule filter (Pall Corporation) prior to the acquisition of measurements.
Absorption measurements were collected with a WPI spectrometer while fluorescence measurements were gathered with a Horiba Fluoromax-4 luminescence spectrometer.
BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
| Parameter | Description | Units |
| Depth | Water depth | meters (m) |
| Spec_Slope | unknown | per nanometer (nm-1) |
| a280 | absorption coefficient at 280 nm | per meter (m-1) |
| a350 | absorption coefficient at 350 nm | per meter (m-1) |
| sp_a280 | specific absorption coefficient at 280 nm | m-1 mg-1 C L |
| sp_a350 | specific absorption coefficient at 280 nm | m-1 mg-1 C L |
| F280_305 | fluorescence emission (exc280/em305) | quinine sulphate units (QSU) |
| F350_450 | fluorescence emission (exc350/em450) | quinine sulphate units (QSU) |
| pH | pH | pH units |
| Dataset-specific Instrument Name | |
| Generic Instrument Name | Benchtop pH Meter |
| Dataset-specific Description | Thermo-Scientific micro pH electrode coupled to an Orion 4 Star pH ISE benchtop meter |
| Generic Instrument Description | An instrument consisting of an electronic voltmeter and pH-responsive electrode that gives a direct conversion of voltage differences to differences of pH at the measurement temperature. (McGraw-Hill Dictionary of Scientific and Technical Terms)
This instrument does not map to the NERC instrument vocabulary term for 'pH Sensor' which measures values in the water column. Benchtop models are typically employed for stationary lab applications. |
| Dataset-specific Instrument Name | SBE 911plus / 917plus CTD |
| Generic Instrument Name | CTD Sea-Bird SBE 911plus |
| Generic Instrument Description | The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics |
| Dataset-specific Instrument Name | Horiba Fluoromax-4 luminescence spectrometer |
| Generic Instrument Name | Spectrometer |
| Generic Instrument Description | A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. |
| Dataset-specific Instrument Name | WPI spectrometer |
| Generic Instrument Name | Spectrometer |
| Generic Instrument Description | A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. |
| Website | |
| Platform | R/V Kilo Moana |
| Start Date | 2014-12-08 |
| End Date | 2014-12-12 |
Chromophoric dissolved organic matter (CDOM) is optically measured material in the oceans resulting from the degradation of organic matter. While the importance of CDOM in the optical properties and biogeochemistry of marine waters has been well established over the last several decades, the source and structure of this material within the ocean basins remains unclear. Some studies indicate that CDOM is produced primarily in situ from either the chemical or biological processing of marine materials, while others have provided evidence that CDOM is primarily a remnant of terrestrial matter that has been diluted and modified during transit to and within the oceans. In this study, researchers from the University of Maryland Center for Environmental Studies will use complete spectral absorption and emission properties combined with chemical and mass spectral tests on samples from the North Pacific Ocean to determine the source and structure of CDOM. The results will be compared with those previously acquired, or to be acquired, from the Delaware Bay, the Middle Atlantic Bight, and the Equatorial Atlantic. By employing this multifaceted approach, the researchers will significantly advance our knowledge of CDOM.
Broader Impacts: This project will provide support for graduate and undergraduate student training, and results will be broadly disseminated through peer-reviewed research publications and presentations at national meetings, where student-led presentations will be emphasized.
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) |