Absorption coefficients of colored dissolved organic matter (CDOM) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic in 2010 (U.S. GEOTRACES NAT project) (NCEI Accession 0278456)
This dataset contains optical and physical data collected on R/V Knorr during cruise KN199-04 in the North Atlantic Ocean from 2010-10-16 to 2010-11-02. These data include depth and wavelength. The instruments used to collect these data include Pump surface and Spectrophotometer with Liquid Core Waveguide- WPI. These data were collected by Charles McClain and Joaquin Chaves of National Aeronautics and Space Administration as part of the "U.S. GEOTRACES North Atlantic Transect (U.S. GEOTRACES NAT)" project and "U.S. GEOTRACES (U.S. GEOTRACES)" program. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-03-27.
The following is the text of the dataset description provided by BCO-DMO:
Absorption coefficients of Colored Dissolved Organic matter (CDOM)
Dataset Description:
Optical absorption coefficient of chromophoric dissolved organic matter (aCDOM) on samples collected during Geotraces 2010 (kn199-04).
Note : These data are considered preliminary. As per PI: "CDOM data will be, unfortunately, sent as "preliminary" since our efforts to develop a satisfactory salinity correction did not yield convincing results. We will have to reanalyze the data from the stored samples. The relative magnitudes of the samples are probably OK, which is probably good, if anybody wants to use the data as a conservative tracer, but absolute magnitudes are suspect. Lots of negative values might be a good hint."
The following metadata was extracted from the original file header:
/begin_header
/investigators=Charles_McClain Joaquin_Chaves
/affiliations=NASA
/contact=joaquin.chaves@nasa.gov
/experiment=GEOTRACES
/cruise=kn199-4
/station=NA
/data_file_name=kn199-4_CDOM_reportBCDMO.csv
/documents=CDOM_protocols.pdf
/calibration_files=NA
/data_type=bottle
/data_status=preliminary
/start_date=20101016
/end_date=20101103
/start_time=15:10:00[GMT]
/end_time=00:19:00[GMT]
/north_latitude=38.3307[DEG]
/south_latitude=17.3497[DEG]
/east_longitude=-9.66[DEG]
/west_longitude=-24.4998[DEG]
/water_depth=-999
/measurement_depth=-999
/secchi_depth=-999
/wind_speed=-999
/cloud_percent=-999
/wave_height=-999
!
!The field "replicates" indicates how many replicate samples were
!averaged to produce the reported value
!
/missing=-999
/delimiter=comma
The following is the text of the dataset description provided by BCO-DMO:
Absorption coefficients of Colored Dissolved Organic matter (CDOM)
Dataset Description:
Optical absorption coefficient of chromophoric dissolved organic matter (aCDOM) on samples collected during Geotraces 2010 (kn199-04).
Note : These data are considered preliminary. As per PI: "CDOM data will be, unfortunately, sent as "preliminary" since our efforts to develop a satisfactory salinity correction did not yield convincing results. We will have to reanalyze the data from the stored samples. The relative magnitudes of the samples are probably OK, which is probably good, if anybody wants to use the data as a conservative tracer, but absolute magnitudes are suspect. Lots of negative values might be a good hint."
The following metadata was extracted from the original file header:
/begin_header
/investigators=Charles_McClain Joaquin_Chaves
/affiliations=NASA
/contact=joaquin.chaves@nasa.gov
/experiment=GEOTRACES
/cruise=kn199-4
/station=NA
/data_file_name=kn199-4_CDOM_reportBCDMO.csv
/documents=CDOM_protocols.pdf
/calibration_files=NA
/data_type=bottle
/data_status=preliminary
/start_date=20101016
/end_date=20101103
/start_time=15:10:00[GMT]
/end_time=00:19:00[GMT]
/north_latitude=38.3307[DEG]
/south_latitude=17.3497[DEG]
/east_longitude=-9.66[DEG]
/west_longitude=-24.4998[DEG]
/water_depth=-999
/measurement_depth=-999
/secchi_depth=-999
/wind_speed=-999
/cloud_percent=-999
/wave_height=-999
!
!The field "replicates" indicates how many replicate samples were
!averaged to produce the reported value
!
/missing=-999
/delimiter=comma
Dataset Citation
- Cite as: McClain, Charles; Chaves, Joaquin (2023). Absorption coefficients of colored dissolved organic matter (CDOM) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic in 2010 (U.S. GEOTRACES NAT project) (NCEI Accession 0278456). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0278456. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0278456
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
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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 | 2010-10-16 to 2010-11-02 |
Spatial Bounding Box Coordinates |
West: -24.5
East: -9.66
South: 17.35
North: 38.331
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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: Methods for the Collection and Measurement of the Spectral Absorption Coefficient (a g λ) of Chromophoric Dissolved Organic Matter (CDOM): Seawater samples for the measurement of chromophoric dissolved organic matter (CDOM) absorption (a g ) are filtered under a gentle vacuum (<5 in Hg) through precombusted (6 hours at 450°C) Whatman GF/F glass fiber filters and collected directly into pre-cleaned and pre-combusted sample glass bottles. Samples for determination of CDOM spectral absorption coefficients are stored under refrigeration at 4°C. In the laboratory, CDOM samples are warmed to room temperature and filtered through 0.2 μm Whatman Nuclepore polycarbonate filters or Gelman Supor (polyethersulfone) filters prior to analysis (Mitchell et al. 2000). Filtration samples through GF/F filters is necessary for coastal ocean waters due to the high particle load that quickly clog Nuclepore and Supor filters. Absorption spectra of CDOM are measured using a multiple pathlength, liquid core waveguide (MPLCW) system (World Precision Instruments, Inc., Sarasota, FL) with UV oxidized Milli-Q water as a reference (Miller et al., 2002). CDOM absorbance spectra are measured between 370 and 725 nm at 1 nm intervals normalized to the reference spectrum. |
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: 2023-07-24T15:37:46Z
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For questions about the information on this page, please email: ncei.info@noaa.gov