19:I[42426,["/_next/static/immutable/chunks/1xctgzqre-wsy.js","/_next/static/immutable/chunks/06_-wz6pdtp2b.js","/_next/static/immutable/chunks/30e52g49hg40p.js","/_next/static/immutable/chunks/02yq6tul2z-oh.js","/_next/static/immutable/chunks/10bx_ec2vj7n_.js","/_next/static/immutable/chunks/33bfn03fo8xnt.js","/_next/static/immutable/chunks/0tfjf78scu61b.js","/_next/static/immutable/chunks/31xnvej4n1bi9.js"],"default"] 1a:T4cf,

This dataset reports gaseous ionic (so-called "reactive") mercury concentration in the atmosphere, measured using specific filters (cation ion exchange (CEM) membranes).

The sampling system was connected to the sector control device that was used for the collection of high volume aerosol samples so these collections were not made during periods of potential air contamination from the ship. While the sectored sampling system was used, the collection time was different than that of the aerosols, and was typically several days. No GEOTRACES ID's are associated with these samples. Samples were analyzed after the cruise by acid digestion of the filter and analysis using well-established protocols, as detailed in He and Mason (2021). Reported concentrations are average values and their standard deviation for each sampling period. Parameter is named based on the format developed by the GEOTRACES committee as: Hg_G_R_CONC_CEM. In the scientific literature, the measurements are reported with the following acronyms: RGM, RGHg, GOM.

Gaseous reactive mercury measured using CEM is reported in units of picograms per cubic meter (pg/m³).
Detection limit = <1
Spike recovery (%) = 101.2±7.1

1b:Tda5,A 60-day research cruise took place in 2018 along a transect form Alaska to Tahiti at 152° W. A description of the project titled "Collaborative Research: Management and implementation of the US GEOTRACES Pacific Meridional Transect", funded by NSF, is below. Further project information is available on the US GEOTRACES website and on the cruise blog. A detailed cruise report is also available as a PDF. Description from NSF award abstract: GEOTRACES is a global effort in the field of Chemical Oceanography in which the United States plays a major role. The goal of the GEOTRACES program is to understand the distributions of many elements and their isotopes in the ocean. Until quite recently, these elements could not be measured at a global scale. Understanding the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. For example, many "trace elements" (elements that are present in very low amounts) are also important for life, and their presence or absence can play a vital role in the population of marine ecosystems. This project will launch the next major U.S. GEOTRACES expedition in the Pacific Ocean between Alaska and Tahiti. The award made here would support all of the major infrastructure for this expedition, including the research vessel, the sampling equipment, and some of the core oceanographic measurements. This project will also support the personnel needed to lead the expedition and collect the samples. This project would support the essential sampling operations and infrastructure for the U.S. GEOTRACES Pacific Meridional Transect along 152° W to support a large variety of individual science projects on trace element and isotope (TEI) biogeochemistry that will follow. Thus, the major objectives of this management proposal are: (1) plan and coordinate a 60 day research cruise in 2018; (2) obtain representative samples for a wide variety of TEIs using a conventional CTD/rosette, GEOTRACES Trace Element Sampling Systems, and in situ pumps; (3) acquire conventional CTD hydrographic data along with discrete samples for salinity, dissolved oxygen, algal pigments, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES intercalibration protocols; (5) prepare and deliver all hydrographic data to the GEOTRACES Data Assembly Centre (via the US BCO-DMO data center); and (6) coordinate all cruise communications between investigators, including preparation of a hydrographic report/publication. This project would also provide baseline measurements of TEIs in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on TEIs in the water column is one that could be uniquely assessed by the GEOTRACES community. In support of efforts to communicate the science to a wide audience the investigators will recruit an early career freelance science journalist with interests in marine science and oceanography to participate on the cruise and do public outreach, photography and/or videography, and social media from the ship, as well as to submit articles about the research to national media. The project would also support several graduate students.1c:Tab8,NSF Award Abstract: Human activity has greatly increased the amount of mercury (Hg) in the environment, and particularly in the surface ocean. Most of the Hg enters the ocean from the atmosphere as a gas, on particles, or in precipitation. Complex physical and chemical processes at the interface between the ocean and atmosphere control the amount of Hg that is retained and therefore that can ultimately accumulate in seafood. Methylmercury (MeHg) is a chemical form of Hg that is commonly retained in organisms and impacts the health and development of humans and wildlife. This research will assess concentrations of Hg together with its "methyl" forms in the atmosphere and surface ocean at sea from Alaska to Tahiti. The spatial extent of the cruise will allow comparison of the air-sea exchange and concentrations of mercury in both the North Pacific where human emissions are large and in remote regions with minimal human impact. The researchers will use established techniques and develop new methods to examine the fate and transport of mercury within the surface ocean. These findings will contribute key Hg data to the GEOTRACES program and thus enhance its overall impact as part of an extensive marine trace element study. Findings will have potential to inform public policy and global environmental treaties related to Hg, thus providing data to evaluate human risk from Hg in present and future climate scenarios. Educational impact will include support for a graduate student and their dissertation using the field data, as well as several undergraduates that will gain high level, hands-on research experience. The research will take advantage of recent analytical advances that enable high resolution determination of the concentrations and forms of inorganic Hg in the surface ocean and atmosphere. The analytical approach will also be expanded to include measurements of methylated Hg compounds, including MeHg and dimethylmercury. These measurements, and ancillary data collected during the GEOTRACES Pacific Meridional Transect cruise, will allow assessment of both atmospheric input and in situ oceanic loss for the dominant forms of inorganic and methylated Hg. Exchange will also be evaluated in the context of the suite of environmental variables collected by collaborators during the cruise. The resulting data will help assess the long-term impact of anthropogenic inputs of Hg to the atmosphere and ocean, and the factors that influence the loss of Hg from the ocean by gas evasion. The studies will build on previous results obtained as part of the GEOTRACES program and other NSF-funded studies, adding novel measurements and building an enhanced understanding of the sources and sinks of Hg to the open ocean.6:["$","$L19",null,{"dataset":{"_id":"833629","description":"","problem":"","acquisition":"$1a","processing":"

BCO-DMO Processing:
\n- added date-time fields in ISO8601 format;
\n- applied GEOTRACES DOoR barcoded names;
\n- renamed fields to conform with BCO-DMO naming conventions.

\n","bcodmoProcessing":"","title":"Gaseous ionic (so-called \"reactive\") mercury concentration in the atmosphere, measured using cation ion exchange (CEM) membranes on the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814 & RR1815) on R/V Roger Revelle from Sept-Nov 2018","nickname":"GP15 Reactive Hg CEM","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"1","version_date":"2020-12-14T05:00:00.000Z","abstract":"Gaseous ionic (so-called \"reactive\") mercury concentration in the atmosphere, measured using cation ion exchange (CEM) membranes on the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814 & RR1815) on R/V Roger Revelle from Sept-Nov 2018.","citation":"Mason, R. (2021) Gaseous ionic (so-called "reactive") mercury concentration in the atmosphere, measured using cation ion exchange (CEM) membranes on the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814 & RR1815) on R/V Roger Revelle from Sept-Nov 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-12-14 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.833629.1 [access date]","citationParts":{"identifier":"doi:10.26008/1912/bco-dmo.833629.1","versionDate":"2020-12-14","versionId":"1","year":"2021","title":"Gaseous ionic (so-called "reactive") mercury concentration in the atmosphere, measured using cation ion exchange (CEM) membranes on the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814 & RR1815) on R/V Roger Revelle from Sept-Nov 2018","authors":"Mason, R.","publisher":"Biological and Chemical Oceanography Data Management Office (BCO-DMO)."},"doi":"10.26008/1912/bco-dmo.833629.1","release_date":null,"field_dataset_location":"","temporal_extent":{"start":"2018-09-20T04:00:00.000Z","end":"2018-10-21T04:00:00.000Z"},"temporal":{"resolution":"time:unitDay","type":"time:Interval","start":{"value":"1537416000","label":"2018-09-20"},"end":{"value":"1540094400","label":"2018-10-21"}},"spatial_extent":{"shape":"polygon","center":{"latitude":37.8065,"longitude":-142.9345},"wkt":"POLYGON ((-156.81 19.681, -129.059 19.681, -129.059 55.932, -156.81 55.932, -156.81 19.681))","north":55.932,"east":-129.059,"south":19.681,"west":-156.81},"dataset_type":["Cruise Results"],"keywords":["oceans"],"data_files":[{"id":"903181","title":"Hg_CEM.csv","url":"https://datadocs.bco-dmo.org/dataset/833629/file/qAAoq68hXnV8Nl/Hg_CEM.csv","showTableUrl":"https://www.bco-dmo.org/dataset/833629/data/view/903181","description":"Primary data file for dataset ID 833629","filename":"Hg_CEM.csv","bytesize":2922,"checksum":{"value":"4b9c59f829b562d0a0628c6e416ee4d8","Algorithm":{"_id":"190","name":"MD5"}},"mimetype":"text/csv","fileType":{"_id":"192","name":"Comma Separated Values (.csv)"},"isErddap":"","date":"","isPublicDuringEmbargo":false,"primaryDataFile":true,"showTable":true,"restricted":false}],"supplemental_files":[],"roles":[{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"749372","name":"Robert P. Mason"},"performedAtOrganization":{"_id":"85","name":"University of Connecticut"}},{"role":{"_id":"145","name":"BCO-DMO Data Manager"},"performedBy":{"_id":"51498","name":"Shannon Rauch"},"performedAtOrganization":{"_id":"191","name":"Woods Hole Oceanographic Institution"}}],"deployments":[{"_id":"776913","name":"RR1814","synonyms":["GP15","GP15 Leg1","33RR20180918","PMT","US GEOTRACES PMT"],"dates":{"start":"2018-09-18T00:00:00.000Z","end":"2018-10-21T00:00:00.000Z"},"platform":{"_id":"54013","name":"R/V Roger Revelle"},"chiefScientists":[{"id":"50679","name":"Gregory A. Cutter","role":"Chief Scientist"},{"id":"50980","name":"Karen L. Casciotti","role":"Co-Chief Scientist"},{"id":"51146","name":"Phoebe J. Lam","role":"Co-Chief Scientist"}]},{"_id":"776917","name":"RR1815","synonyms":["GP15","GP15 Leg 2","33RR20180918","PMT","US GEOTRACES PMT"],"dates":{"start":"2018-10-24T00:00:00.000Z","end":"2018-11-24T00:00:00.000Z"},"platform":{"_id":"54013","name":"R/V Roger Revelle"},"chiefScientists":[{"id":"50679","name":"Gregory A. Cutter","role":"Chief Scientist"},{"id":"50980","name":"Karen L. Casciotti","role":"Co-Chief Scientist"},{"id":"51146","name":"Phoebe J. Lam","role":"Co-Chief Scientist"}]}],"funding":[{"_id":"826590","name":"OCE-1736659","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1736659"}],"instruments":[],"parameters":[{"_id":"833657","name":"Station_ID","format":"","frictionlessType":"number","description":"

Station number

","units":{"_id":"","name":"unitless"},"type":{"_id":"987","name":"station","description":"

Station identifier; a unique number or alphanumeric string designating a general geographic location at which one or more sampling activities may occur.

"}},{"_id":"833658","name":"Start_Date_UTC","format":"%d/%m/%Y","frictionlessType":"date","description":"

Date (UTC) at start of sample collection; format: DD/MM/YYYY

","units":{"_id":"","name":"unitless"},"type":{"_id":"1070","name":"date","description":"

date; generally reported in GMT as YYYYMMDD (year; month; day); also as MMDD (month; day); EqPac dates are local Hawaii time. ISO_Date format is YYYY-MM-DD (http://www.iso.org/iso/home/standards/iso8601.htm)

"}},{"_id":"833659","name":"Start_Time_UTC","format":"%H:%M","frictionlessType":"time","description":"

Time (UTC) at start of sample collection; format: hh:mm

","units":{"_id":"","name":"unitless"},"type":{"_id":"1075","name":"time","description":"

Time GMT defined as HHMM; time of day; generally reported in GMT as HHMM (hours and minutes) but may also be HH.H (decimal hours) or HHMMSS (hours; minutes and seconds); in EqPac time is reported as Hawaii local time

"}},{"_id":"833660","name":"Start_ISO_DateTime_UTC","format":"%Y-%m-%dT%H:%MZ","frictionlessType":"datetime","description":"

Date and time (UTC) at start of sample collection; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ

","units":{"_id":"","name":"unitless"},"type":{"_id":"1908","name":"ISO_DateTime_UTC","description":"

Date/Time (UTC) ISO formatted
\nThis standard is based on ISO 8601:2004(E) and takes on any of the following forms:
\n2009-08-30T09:05:00[.xx] (local time)
\n2009-08-30T14:05:00[.xx]Z (UTC time)
\n2009-08-30T14:05:00[.xx]-05:00
\nThe dashes and the colons can be dropped.
\nThe T can also be dropped \"by mutual agreement\", but one needs the trailing Z if the time is UTC.

Sample ISO_datetime_utc:
\n2009-08-30T14:05:00[.xx]Z (UTC time)

Format: YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)

"}},{"_id":"833661","name":"End_Date_UTC","format":"%d/%m/%Y","frictionlessType":"date","description":"

Date (UTC) at end of sample collection; format: DD/MM/YYYY

","units":{"_id":"","name":"unitless"},"type":{"_id":"1070","name":"date","description":"

"}},{"_id":"833662","name":"End_Time_UTC","format":"%H:%M","frictionlessType":"time","description":"

Time (UTC) at end of sample collection; format: hh:mm

","units":{"_id":"","name":"unitless"},"type":{"_id":"1075","name":"time","description":"

"}},{"_id":"833663","name":"End_ISO_DateTime_UTC","format":"%Y-%m-%dT%H:%MZ","frictionlessType":"datetime","description":"

Date and time (UTC) at end of sample collection; formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ

","units":{"_id":"","name":"unitless"},"type":{"_id":"1908","name":"ISO_DateTime_UTC","description":"

Sample ISO_datetime_utc:
\n2009-08-30T14:05:00[.xx]Z (UTC time)

Format: YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)

"}},{"_id":"833664","name":"Start_Latitude","format":"","frictionlessType":"number","description":"

Latitude at start of sample collection

","units":{"_id":"","name":"degrees North"},"type":{"_id":"730","name":"latitude","description":"

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

"}},{"_id":"833665","name":"Start_Longitude","format":"","frictionlessType":"number","description":"

Longitude at start of sample collection

","units":{"_id":"","name":"degrees East"},"type":{"_id":"731","name":"longitude","description":"

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datasets as degrees, minutes

"}},{"_id":"833666","name":"End_Latitude","format":"","frictionlessType":"number","description":"

Latitude at end of sample collection

","units":{"_id":"","name":"degrees North"},"type":{"_id":"730","name":"latitude","description":"

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

"}},{"_id":"833667","name":"End_Longitude","format":"","frictionlessType":"number","description":"

Longitude at end of sample collection

","units":{"_id":"","name":"degrees East"},"type":{"_id":"731","name":"longitude","description":"

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datasets as degrees, minutes

"}},{"_id":"833668","name":"Event_ID","format":"","frictionlessType":"number","description":"

Event number

","units":{"_id":"","name":"unitless"},"type":{"_id":"829","name":"event","description":"

Event or operation identifier; event or operation number; often derived from date/time (MMDDHHmm) of sampling and when combined with year (YYYY) is a unique sampling identifier/data processing key. Date/time is not necessarily in GMT.

"}},{"_id":"833669","name":"Sample_ID","format":"","frictionlessType":"number","description":"

GEOTRACES sample number

","units":{"_id":"","name":"unitless"},"type":{"_id":"960","name":"sample","description":"

unique sample identification or number; any combination of alpha numeric characters; precise definition is file dependent

"}},{"_id":"833670","name":"Sample_Depth","format":"","frictionlessType":"number","description":"

Sample depth

","units":{"_id":"","name":"meters (m)"},"type":{"_id":"808","name":"depth","description":"

Observation/sample depth below the sea surface. Units often reported as: meters, feet.

\nWhen used in a JGOFS/GLOBEC dataset the depth is a best estimate; usually but not always calculated from pressure; calculated either from CTD pressure using Fofonoff and Millard (1982; UNESCO Tech Paper #44) algorithm adjusted for 1980 equation of state for seawater (EOS80) or simply equivalent to nominal depth as recorded during sampling if CTD pressure was unavailable.

"}},{"_id":"833671","name":"Hg_G_R_CONC_CEM","format":"","frictionlessType":"number","description":"

Gaseous ionic ("reactive") mercury concentration in the atmosphere, measured using cation ion exchange (CEM) membranes

","units":{"_id":"","name":"picograms per cubic meter (pg m-3)"},"type":{"_id":"833610","name":"reactive_Hg","description":"

Operationally defined as atomic mercury present in any compounds that can be determined without prior oxidation; sometimes referred to as stannous-chloride-reducible mercury.

"}},{"_id":"833672","name":"SD1_Hg_G_R_CONC_CEM","format":"","frictionlessType":"number","description":"

One standard deviation of Hg_G_R_CONC_CEM

","units":{"_id":"","name":"picograms per cubic meter (pg m-3)"},"type":{"_id":"833610","name":"reactive_Hg","description":"

Operationally defined as atomic mercury present in any compounds that can be determined without prior oxidation; sometimes referred to as stannous-chloride-reducible mercury.

"}},{"_id":"833673","name":"Flag_Hg_G_R_CONC_CEM","format":"","frictionlessType":"number","description":"

Quality flag for Hg_G_R_CONC_CEM

","units":{"_id":"","name":"unitless"},"type":{"_id":"1144","name":"q_flag","description":"

quality flag; based on a PI established code; identifies a problem/quality issue with sample(s) from a given water bottle or single observation

"}}],"related_publications":[{"id":"833640","citation":"He, Y., & Mason, R. P. (2021). Comparison of reactive gaseous mercury measured by KCl-coated denuders and cation exchange membranes during the Pacific GEOTRACES GP15 expedition. Atmospheric Environment, 244, 117973. https://doi.org/10.1016/j.atmosenv.2020.117973\r\n","relation_type":["Methods"],"relation_desc":""}],"related_datasets":[],"services":[{"grouping":"","items":[{"name":"View Data","description":"An in-browser view of the primary tabular data file","url":"https://www.bco-dmo.org/dataset/833629/data/view","contentType":"text/html","actionType":"view"}]},{"grouping":"Metadata","items":[{"name":"HTML","description":"A simple HTML page of the dataset metadata","url":"https://www.bco-dmo.org/dataset/833629/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/833629/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/833629/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[{"_id":"2022","name":"U.S. GEOTRACES","acronym":"U.S. GEOTRACES"}],"projects":[{"_id":"695926","name":"US GEOTRACES Pacific Meridional Transect (GP15)","acronym":"U.S. GEOTRACES PMT","description":"$1b"},{"_id":"826591","name":"US GEOTRACES Pacific Meridional Transect: Determination of the air-sea exchange of inorganic and methylated mercury in the anthropogenically-impacted and remote Pacific Ocean","acronym":"PMT Mercury air-sea exchange","description":"$1c"}],"archives":[{"id_value":"10.26008/1912/bco-dmo.833629.1","url":"https://doi.org/10.26008/1912/bco-dmo.833629.1","date_assigned":"2021-01-12","version_date":"2020-12-14","archiver":"Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)","archiver_id":"272"}],"license":{"name":"Creative Commons Attribution 4.0","id":"CC-BY-4.0","uri":"https://creativecommons.org/licenses/by/4.0/","spdxUri":"https://spdx.org/licenses/CC-BY-4.0"},"metrics":{"views":{"count":198},"downloads":{"count":343}}}}]