http://lod.bco-dmo.org/id/dataset/950021
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
2025-01-31
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Total Mercury Concentrations Collected from Scripps Pier in La Jolla, CA from December 2020 to December 2024
2025-02-04
publication
2025-02-04
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2025-02-05
publication
https://doi.org/10.26008/1912/bco-dmo.950021.1
Amina T. Schartup
University of California-San Diego Scripps
principalInvestigator
Carl Lamborg
University of California-Santa Cruz
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: Adams, H. M., Schartup, A. T., Lamborg, C. (2025) Total Mercury Concentrations Collected from Scripps Pier in La Jolla, CA from December 2020 to December 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-02-04 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.950021.1 [access date]
Total Mercury Time Series at Scripps Pier Dataset Description: Methods and Sampling: <p>Weekly sampling was conducted between December 2020 and November 2024 at the Ellen Browning Scripps Memorial Pier (Scripps Pier) in La Jolla, CA (32.8634&nbsp;°N, 117.2546&nbsp;°W). Total Hg (THg) and total methylated Hg (MeHg; not shown) were sampled at depths of &lt; 0.5 m and 6 m using a peristaltic pump equipped with weighted sample tubing. Seawater was pumped into clean borosilicate glass bottles (I-Chem) and returned to the lab. MeHg and THg samples were acidified with 0.4% hydrochloric acid (HCl; Trace Metal Grade, J.T. Baker), and stored at 4°C until analysis within 6 months.</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2023031 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2023031
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2023046 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2023046
completed
Amina T. Schartup
University of California-San Diego Scripps
858-534-8752
UC San Diego 9500 Gilman Dr #0220
La Jolla
CA
92093-0220
USA
aschartup@ucsd.edu
pointOfContact
Carl Lamborg
University of California-Santa Cruz
831-459-2908
A442 Earth & Marine Sciences 1156 High Street
Santa Cruz
CA
95064
USA
clamborg@ucsc.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Latitude
Longitude
Date
Time_UTC
ISO_DateTime_UTC
Surface_THg_Concentration
Deep_THg_Concentration
Deep_Sample_Depth
theme
None, User defined
latitude
longitude
date
time of day
ISO_DateTime_UTC
total mercury
depth
featureType
BCO-DMO Standard Parameters
Tekran 2600 Automated Total Mercury Analyzer series
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.
Collaborative Proposal: Unravelling the Oceanic Dimethylmercury Cycle
https://osprey.bco-dmo.org/project/908151
Collaborative Proposal: Unravelling the Oceanic Dimethylmercury Cycle
<p><em>NSF Award Abstract:</em><br />
This project will study how dimethylmercury is formed and removed in the oceans. Dimethylmercury is a naturally occurring compound. It is thought to be formed when man-made mercury is converted into monomethylmercury, a toxin that accumulates in fish. Despite representing a large fraction of mercury in the oceans, the origin and fate of dimethylmercury is not known. This research will use state-of-the-art analytical, genomic and modeling tools to address this information gap. It will also train graduate and undergraduate students to use field, experimental, and modeling methods. The results will be used in predictive models to forecast future trends in the oceanic mercury cycle. These models are needed to evaluate the effectiveness of international actions that seek to reverse increasing trends in the bioaccumulation of monomethylmercury in fish.</p>
<p>Methylated mercury species in the ocean are formed in sediment and the water column from inorganic divalent mercury delivered from the atmosphere and rivers. The putative mechanism is a two-step process during which monomethylmercury is formed first, followed by slow methylation into dimethylmercury. The first step, biomethylation of divalent mercury into monomethylmercury, is relatively well-studied in sediment and known to be driven by sulfate- and iron-reducing bacteria and methanogens. The mechanism for monomethylmercury formation in the water column is less well understood, and the process of dimethylmercury formation in sediment or seawater is essentially unknown. Until recently, it was assumed that dimethylmercury represented a small enough fraction of the methylated and total mercury (the sum of all mercury species) pools to be insignificant in the global mercury cycle. Recent measurements, however, show that dimethylmercury levels in seawater can be in the same range as the other mercury species. This project will identify the biological and chemical methylating agents involved in the formation of dimethylmercury. Further, it will test the impact of varying biogeochemical conditions on dimethylmercury production. Results will be used to update the mercury module of the MIT General Circulation Model (MITgcm, a global biogeochemical model, and analyze the impacts of dimethylmercury production and degradation on monomethylmercury concentrations.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
DMHg in the Ocean
largerWorkCitation
project
eng; USA
oceans
-117.2546
-117.2546
32.8634
32.8634
2020-12-04
2024-12-04
Monterey Bay, California Current, Greenland
0
BCO-DMO catalogue of parameters from Total Mercury Concentrations Collected from Scripps Pier in La Jolla, CA from December 2020 to December 2024
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/950521.rdf
Name: Latitude
Units: decimal degrees
Description: <p>Sampling latitude, south is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/950522.rdf
Name: Longitude
Units: decimal degrees
Description: <p>Sampling longitude, west is negative</p>
http://lod.bco-dmo.org/id/dataset-parameter/950523.rdf
Name: Date
Units: unitless
Description: <p>Date in format YYYY-MM-DD</p>
http://lod.bco-dmo.org/id/dataset-parameter/950524.rdf
Name: Time_UTC
Units: unitless
Description: <p>UTC time of sampling</p>
http://lod.bco-dmo.org/id/dataset-parameter/950525.rdf
Name: ISO_DateTime_UTC
Units: units
Description: <p>Sampling DateTime in ISO format (UTC Timezone)</p>
http://lod.bco-dmo.org/id/dataset-parameter/950526.rdf
Name: Surface_THg_Concentration
Units: picomolar (pM)
Description: <p>Concentration of total mercury in the surface ( < 0.5 m) sample, DL = 0.17 pM</p>
http://lod.bco-dmo.org/id/dataset-parameter/950527.rdf
Name: Deep_THg_Concentration
Units: picomolar (pM)
Description: <p>Concentration of total mercury in the deep sample, DL = 0.17 pM</p>
http://lod.bco-dmo.org/id/dataset-parameter/950528.rdf
Name: Deep_Sample_Depth
Units: meters (m)
Description: <p>Depth of sampling the "deep" sample</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
11979
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/da192274-6628-42c4-b980-1f9812770323/content
download
https://doi.org/10.26008/1912/bco-dmo.950021.1
download
onLine
dataset
<p>Weekly sampling was conducted between December 2020 and November 2024 at the Ellen Browning Scripps Memorial Pier (Scripps Pier) in La Jolla, CA (32.8634&nbsp;°N, 117.2546&nbsp;°W). Total Hg (THg) and total methylated Hg (MeHg; not shown) were sampled at depths of &lt; 0.5 m and 6 m using a peristaltic pump equipped with weighted sample tubing. Seawater was pumped into clean borosilicate glass bottles (I-Chem) and returned to the lab. MeHg and THg samples were acidified with 0.4% hydrochloric acid (HCl; Trace Metal Grade, J.T. Baker), and stored at 4°C until analysis within 6 months.</p>
Specified by the Principal Investigator(s)
<p>THg concentrations were measured following U.S. EPA Method 1631e<sup> </sup>(Lambourg et al., 2012). 30 mL samples were amended by bromine monochloride oxidation, hydroxylamine and tin (II) chloride reduction, and purged onto gold traps followed by cold-vapor atomic fluorescence spectrometry (CV-AFS) using a Tekran 2600 Automated Hg Analyzer. Calibration was based on an aqueous 1000 ppm mercuric chloride (HgCl<sub>2</sub>) standard (SPEX Certiprep®) and confirmed with a second 1000 ppm HgCl<sub>2</sub>&nbsp;standard (Alfa Aesar). To validate concentrations, we analyzed the certified reference material ORMS-3 (National Research Council Canada, Ottawa, Canada) with a certified value of 12.6&nbsp;±&nbsp;1.1 ng L<sup>-1</sup> (Yang et al., 2005). We determined ORMS-3 concentrations to be 14.8&nbsp;±&nbsp;2.44 ng L<sup>-1</sup>&nbsp;(<em>n</em>&nbsp;= 12).&nbsp;&nbsp;The detection limit was 0.17 pM (<em>n</em>&nbsp;= 75 reagent blanks) with ongoing precision and recovery of 101&nbsp;±&nbsp;6% (<em>n</em>&nbsp;= 73). Average replicate precision was 6% (<em>n</em>&nbsp;= 130), and matrix spike recovery was 93&nbsp;±&nbsp;12% (<em>n</em>&nbsp;= 36).</p>
Specified by the Principal Investigator(s)
* Added lat/lon to dataset
* Added ISO_DateTime to dataset
* Converted numberic citation style to author citation style
Specified by BCO-DMO Data Managers
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
PI Supplied Instrument Name: PI Supplied Instrument Description:cold-vapor atomic fluorescence spectrometry (CV-AFS) using a Tekran 2600 Automated Hg Analyzer. Instrument Name: Tekran 2600 Automated Total Mercury Analyzer series Instrument Short Name:Tekran 2600 Instrument Description: The Tekran 2600 is a total Mercury (Hg) analysis system that can measure sub-picogram quantities of mercury in water, soil, vegetation, and other sample matrices. The system utilizes a Cold Vapour Atomic Fluorescence Spectroscopy (CVAFS) detector. The 2600-IVS (In-Vial Sparging) model is reconfigured for direct in-vial sparging sample introduction, and the 2600-NG (Natural Gas) model is designed for the analysis of gas phase sample cartridges. The system is capable of multiple method configurations: Dual stage gold preconcentration (EPA Method 1631); Direct measurement without preconcentration (EPA Method 245.7); Air sample analysis on gold traps (EPA Compendium Method IO-5); and Natural gas analysis on gold traps (ASTM D-6350, ISO 6978). It has a guaranteed minimum detection limit of < 0.05 nanograms per liter (ng/L). In clean room environments, with low mercury blanks, minimum detection limits as low as 0.02 ng/L are achievable.
See: https://www.tekran.com/products/laboratory/tekran-model-2600-automated-total-mercury-analysis-system/