Apparent Quantum Yields for the Photochemical Formation of Carbonyl Compounds in Seawater from the R/V Endeavor EN589 in the Northwest Atlantic Ocean from September to October 2016 (NCEI Accession 0277698)
This dataset contains optical and physical data collected on R/V Endeavor during cruise EN589 in the North Atlantic Ocean from 2016-09-17 to 2016-10-10. These data include depth and wavelength. The instruments used to collect these data include High Performance Liquid Chromatograph. These data were collected by David J. Kieber of State University of New York ESF as part of the "Collaborative Research: Coupled Ocean-Atmosphere Recycling of Refractory Dissolved Organic Carbon in Seawater (Refractory DOC Recycling)" project and "United States Surface Ocean Lower Atmosphere Study (U.S. SOLAS)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-11-22.
The following is the text of the dataset description provided by BCO-DMO:
Dataset Description:
Apparent Quantum Yields for the Photochemical Formation of Carbonyl Compounds in Seawater from the R/V Endeavor EN589 in the Northwest Atlantic Ocean from September to October 2016.
The following is the text of the dataset description provided by BCO-DMO:
Dataset Description:
Apparent Quantum Yields for the Photochemical Formation of Carbonyl Compounds in Seawater from the R/V Endeavor EN589 in the Northwest Atlantic Ocean from September to October 2016.
Dataset Citation
- Cite as: Kieber, David J. (2023). Apparent Quantum Yields for the Photochemical Formation of Carbonyl Compounds in Seawater from the R/V Endeavor EN589 in the Northwest Atlantic Ocean from September to October 2016 (NCEI Accession 0277698). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0277698. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0277698
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2016-09-17 to 2016-10-10 |
Spatial Bounding Box Coordinates |
West: -71.179
East: -64.704
South: 35.012
North: 41.401
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | Acquisition Description: Seawater sampling and Experimental Set up. Seawater was gravity filtered directly from the Niskin bottle through a 0.2-μm POLYCAP 75 AS Nylon filter (Whatman) into two 2 L Qorpak glass bottles previously rinsed by Milli Q water and muffled at 550 ˚C for 8 h. Each bottle was filled leaving 3–5 mL headspace, sealed with a Teflon-lined silicone screw cap, and stored at 4 °C in the dark until analyzed in Syracuse, NY. POLYCAP filters were cleaned prior to use by alternating rinses of acetonitrile and Milli Q water followed by extensive flushing with Milli Q. Prior to irradiation experiments, a Milli Q sample or 0.2 μm-filtered seawater sample was pneumatically pushed through 1/8” O.D. Teflon tubing with ultra-high purity helium (99.999%) into a rectangular quartz cell (4 mL capacity, 1 cm pathlength, Spectrocell, Inc.) for at least 10 min at a flow rate of 2 mL min -1 . The quartz cell was periodically inverted to remove residual air bubbles. The quartz cell was sealed with a screw cap containing a Teflon-lined silicone septum insert. Once the quartz cell was filled with a sample, it was placed into an enclosed temperature-controlled cell holder equipped with a stirrer. All irradiations were performed using a model QP-SX10001, 1000 W xenon lamp (Superior Quartz Products, Inc.) along with a GM 252 monochromator (Spectral Energy, Corp.). A 10 nm bandwidth was used for irradiations <330 nm and a 20 nm bandwidth was used for longer wavelengths. A longpass filter with a 307 nm cutoff (50% transmission at 307 nm) was placed in the optical path directly after the monochromator for wavelengths >330 nm. Irradiation times varied from 1 to 36 h and were chosen depending on the wavelength of the irradiation and the absorbance of the seawater sample. Dark controls were incubated in the cell holder for up to 36 h. Except when noted, the cell holder temperature was set at 20 °C for all irradiations. Carbonyl Determination. A 2.2 mL aliquot of the irradiated seawater sample or dark control was added to a 20 L aliquot of the 2,4-dinitrophenylhydrazine (DNPH) reagent in a ~2.2 mL Qorpak vial that was capped tightly with no headspace. The lid of the cap contained a Teflon-lined silicone septum. All samples were reacted at room temperature for a minimum of 12 h and a maximum of 48 h. Derivatized standards (Sigma-Aldrich), dark controls, and samples were analyzed using a Shimadzu Prominence high performance liquid chromatography (HPLC) system with a model SPD-20A/V UV-Vis absorbance detector set in dual wavelength mode at 371 and 435 nm. The HPLC column consisted of a Waters 8×100 mm Nova-Pak cartridge with 4 μm C 18 packing placed in a Waters RCM radial compression cartridge holder (Waters Associates, Milford, MA). The mobile phase consisted of solvent A (Milli Q) and solvent B (acetonitrile). The elution program was isocratic at 30% B for 3 min, 30 to 55% B in 5 min, isocratic at 55% B for 2 min, 55 to 90% B in 6 min, isocratic at 90% B for 5 min, 90% B to 30% B in 1 min, followed by column equilibration to the initial mobile phase composition for 15 min. All samples were injected using a 1.25 mL injection loop. The flow rate was 1.5 mL min -1 and the column oven temperature was 40 ˚C. The sample analysis time was 37 min. AQY method. AQY was calculated by dividing the moles of carbonyl compounds produced by the moles of photons absorbed by seawater. Refer to Zhu & Kieber (2018, 2019) for details regarding AQY determination, seawater absorptivity, and photon flux of the monochromatic irradiation. |
Purpose | This dataset is available to the public for a wide variety of uses including scientific research and analysis. |
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Last Modified: 2024-05-31T18:50:46Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov