http://lod.bco-dmo.org/id/dataset/772335
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2019-07-02
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Halomethane concentrations in San Pedro Ocean Time series (SPOT) from March to December 2017
2019-07-02
publication
2019-07-02
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2021-01-04
publication
https://doi.org/10.26008/1912/bco-dmo.772335.1
Sergio A. Sanudo-Wilhelmy
University of Southern California
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Sanudo-Wilhelmy, S. A. (2021) Halomethane concentrations in San Pedro Ocean Time series (SPOT) from March to December 2017. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2019-07-02 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.772335.1 [access date]
Concentrations of CH3Br, CH3I, CH2Br2, and CHBr3 seawater Dataset Description: <p>Concentrations of bromomethane (CH3Br), iodomethane (CH3I), dibromo methane (CH2Br2), and bromoform tribromomethane&nbsp;(CHBr3) seawater.</p> Methods and Sampling: <p>Samples were collected at 7 depths using Niskin sampling bottles deployed on a rosette for deep samples from 0 meters to 250 meters. Samples were transferred from Niskins into acid cleaned 250 ml borosilicate serum bottles without entraining air, acidifed with 1mL 1 molar hydrochloric acid and stored in the refrigerator for up to two weeks prior to analysis. Duplicate samples were taken.</p>
<p>Samples were analyzed for dissolved halocarbon concentrations using a gas chromatography (GC) method adapted from Schall and Heumann (1993) and quantified relative to an internal standard. Purge-and-trap capillary column gas chromatography with electron capture detection(GC-ECD) (EPA, 1986; Schall and Heumann 1993). 5-50 mL seawater samples were purged with ultra-high purity He for 45min at a flow rate of 60mL min-1 through an in-line K2CO3 drying tube and onto a liquid nitrogen trap. The purge vessel is then rinsed with methanol and the drying trap replaced with 0.75g fresh K2CO3 between individual analyses.</p>
<p>Cryo-concentrated samples were introduced into an Agilent 7890A GC by means of a splitless injection with sweep pressure at 50psi for 3.5min returning to analytical column pressure of 18psi after injection. Inlet temperature was set to 60°C to facilitate cryo-focusing on the column. Initial oven temperature was 40°C for 10min increasing to 120°C by 4°C min-1 and held there for another 2min. Temperature was then ramped to a final 240°C at a rate of 5°C min-1 and held for 20min&nbsp;</p>
<p>Calibration was carried out using 20µL of 0.5µg/L of tribromochloromethane as an internal standard<br />
(Gonzalez-Gago et al. 2007)</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1559276 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1559276
completed
Sergio A. Sanudo-Wilhelmy
University of Southern California
213-821-1302
3616 Trousdale Pkwy Dept. of Biological Sciences, AHF 206, Mail Code: 0371
Los Angeles
CA
90089
USA
sanudo@usc.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Date
Depth
note
CH3Br_Average
CH3Br_SD
CH3I_avg
CH3I_SD
CH2Br2_avg
CH2Br2_SD
CHBr3_avg
CHBr3_SD
ISO_Date
lat
lon
Agilent 7890A Gas Chromatograph
theme
None, User defined
date
depth
comments
No BCO-DMO term
latitude
longitude
featureType
BCO-DMO Standard Parameters
Gas Chromatograph
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
The role of organic and metal cofactors on the biogenic synthesis of halogenated volatile hydrocarbons
https://osprey.bco-dmo.org/project/712782
The role of organic and metal cofactors on the biogenic synthesis of halogenated volatile hydrocarbons
<p><em>NSF Award Abstract:</em><br />
Volatile halogenated hydrocarbon gases, in this case halomethanes, are produced naturally by organisms in the ocean; which then serves as a source of these biogenic gases to the atmosphere. Their chemical reactions in the atmosphere are very similar to those of anthropogenic chlorofluorocarbons (CFCs). While CFCs are well-studied because they consume the ozone in the upper atmosphere that shields the earth from harmful ultraviolet radiation, halomethanes have been largely neglected, even though they currently account for 25% of the ozone depletion. As anthropogenic CFC levels steadily decline, however, halomethanes are predicted to account for 50% of ozone depletion by 2050. Based on limited study thus far, marine halomethane production has been ascribed mainly to phytoplankton and macro algae. This project will build on new and compelling data that suggests marine heterotrophic bacteria could also be major producers of halomethanes. The data produced here will provide the critical evaluation required to address discrepancies in global halomethane budgets which currently are out of balance due to an unknown source to the atmosphere, evaluating the hypothesis that marine heterotrophic bacteria can supply this missing source. Concerns over the stability of the earth's stratospheric ozone layer make this valuable and necessary research with added value of providing support for engaged undergraduate, graduate, and postdoctoral education at the University of Southern California.</p>
<p>Past research on the production of marine halomethanes has focused on phytoplankton and macro algae, while potential bacterial contributions to the processe have been neglected. This research proposes to study the role of marine heterotrophic bacteria on the production of halomethanes. It has been noted in past studies that there are discrepancies in the global atmospheric halomethane budget, and it is possible this is due to a large missing bacterial source. Additionally, this research will evaluate the potential importance of vitamin B12, methionine, and vanadium cofactors on the synthesis of halomethanes in bacteria. A large portion of marine bacteria cannot synthesize methylation co-enzymes, and therefore, would require available B12, methionine, and vanadium from external sources to complete the methylation step. This study will also measure concentrations of halomethanes, B12, methionine, and vanadium in upwelling regions as well as at a long-term time series site in order to put constraints on the variability of halomethanes concentrations for use in global linked air-sea models.</p>
Volatile_Hydrocarbons
largerWorkCitation
project
eng; USA
oceans
-118.4
-118.4
33.55
33.55
2017-03-01
2017-12-01
0
BCO-DMO catalogue of parameters from Halomethane concentrations in San Pedro Ocean Time series (SPOT) from March to December 2017
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/772430.rdf
Name: Date
Units: unitless
Description: <p>observation year and month</p>
http://lod.bco-dmo.org/id/dataset-parameter/772431.rdf
Name: Depth
Units: meters (m)
Description: <p>water depth</p>
http://lod.bco-dmo.org/id/dataset-parameter/772432.rdf
Name: note
Units: unitless
Description: <p>comments</p>
http://lod.bco-dmo.org/id/dataset-parameter/772433.rdf
Name: CH3Br_Average
Units: pico mole per liter (pmol/L)
Description: <p>bromomethane average</p>
http://lod.bco-dmo.org/id/dataset-parameter/772434.rdf
Name: CH3Br_SD
Units: pico mole per liter (pmol/L)
Description: <p>bromomethane standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/772435.rdf
Name: CH3I_avg
Units: pico mole per liter (pmol/L)
Description: <p>CH3I average</p>
http://lod.bco-dmo.org/id/dataset-parameter/772436.rdf
Name: CH3I_SD
Units: pico mole per liter (pmol/L)
Description: <p>CH3I standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/772437.rdf
Name: CH2Br2_avg
Units: pico mole per liter (pmol/L)
Description: <p>dibromo methane average</p>
http://lod.bco-dmo.org/id/dataset-parameter/772438.rdf
Name: CH2Br2_SD
Units: pico mole per liter (pmol/L)
Description: <p>dibromo methane standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/772439.rdf
Name: CHBr3_avg
Units: pico mole per liter (pmol/L)
Description: <p>bromoform; tribromomethane average</p>
http://lod.bco-dmo.org/id/dataset-parameter/772440.rdf
Name: CHBr3_SD
Units: pico mole per liter (pmol/L)
Description: <p>bromoform; tribromomethane standard deviation</p>
http://lod.bco-dmo.org/id/dataset-parameter/772441.rdf
Name: ISO_Date
Units: unitless
Description: <p>Date in ISO-8601 format</p>
http://lod.bco-dmo.org/id/dataset-parameter/772442.rdf
Name: lat
Units: decimal degrees
Description: <p>latitude with positive values indicating North</p>
http://lod.bco-dmo.org/id/dataset-parameter/772443.rdf
Name: lon
Units: decimal degrees
Description: <p>longitude with negative values indicating West</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
7529
https://darchive.mblwhoilibrary.org/bitstream/1912/26527/1/dataset-772335_halomethane-concentration-profile__v1.tsv
download
https://doi.org/10.26008/1912/bco-dmo.772335.1
download
onLine
dataset
<p>Samples were collected at 7 depths using Niskin sampling bottles deployed on a rosette for deep samples from 0 meters to 250 meters. Samples were transferred from Niskins into acid cleaned 250 ml borosilicate serum bottles without entraining air, acidifed with 1mL 1 molar hydrochloric acid and stored in the refrigerator for up to two weeks prior to analysis. Duplicate samples were taken.</p>
<p>Samples were analyzed for dissolved halocarbon concentrations using a gas chromatography (GC) method adapted from Schall and Heumann (1993) and quantified relative to an internal standard. Purge-and-trap capillary column gas chromatography with electron capture detection(GC-ECD) (EPA, 1986; Schall and Heumann 1993). 5-50 mL seawater samples were purged with ultra-high purity He for 45min at a flow rate of 60mL min-1 through an in-line K2CO3 drying tube and onto a liquid nitrogen trap. The purge vessel is then rinsed with methanol and the drying trap replaced with 0.75g fresh K2CO3 between individual analyses.</p>
<p>Cryo-concentrated samples were introduced into an Agilent 7890A GC by means of a splitless injection with sweep pressure at 50psi for 3.5min returning to analytical column pressure of 18psi after injection. Inlet temperature was set to 60°C to facilitate cryo-focusing on the column. Initial oven temperature was 40°C for 10min increasing to 120°C by 4°C min-1 and held there for another 2min. Temperature was then ramped to a final 240°C at a rate of 5°C min-1 and held for 20min&nbsp;</p>
<p>Calibration was carried out using 20µL of 0.5µg/L of tribromochloromethane as an internal standard<br />
(Gonzalez-Gago et al. 2007)</p>
Specified by the Principal Investigator(s)
<p>Data was processed using&nbsp;Peak Simple model 302 Integration using Peak 393 software.</p>
<p>BCO-DMO Processing notes:<br />
-&nbsp;added conventional header with dataset name, PI name, version date<br />
- modified parameter names to conform with BCO-DMO naming conventions<br />
- added latitde and longitude columns with coordinates from metadata form.<br />
- added ISO_Date column with date formatted according to ISO-8601 convention.</p>
<p>&nbsp;</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Agilent 7890A Gas Chromatograph
Agilent 7890A Gas Chromatograph
PI Supplied Instrument Name: Agilent 7890A Gas Chromatograph PI Supplied Instrument Description:Agilent 7890A Gas Chromatograph with electron capture detector. Column- Restek Rtx-502.2 (60m, 0.32mm ID, 1.8µm) Instrument Name: Gas Chromatograph Instrument Short Name:Gas Chromatograph Instrument Description: Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC) Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB02/