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:T817,

Aerosol samples were collected between Nov 7, 2011 and Dec 9, 2013 during the U.S. GEOTRACES EPZT cruise, R/V Thomas G. Thompson (TGT303), which took place from 25 October 2013 - 20 December 2013, Manta, Ecuador - Papeete, Tahiti, French Polynesia. Aerosol samples were obtained with a Tisch TE-5170V-BL high volume aerosol sampler, modified to collect 12 replicate samples on acid-washed (Wallace et al, 1977; Baker et al., 2006) 47 mm diameter Whatman-41 (W-41) filters, using procedures of the US GEOTRACES aerosol program (Morton et al., 2013). In order to minimize the filter blanks for our experiment, the W-41 filters were pre-cleaned before deployment using three cycles of leaching with 0.5M HCl (Optima) then rinsing with ultra-high purity water (UHP water) according to trace element protocols in a HEPA-filtered laminar flow hood (Morton et al., 2013; similar to Baker et al., 2006).

For 7Be, three of the 47 mm aerosol samples were stacked in a plastic Petri dish and counted by gamma spectroscopy. Be-7 has a readily identifiable gamma peak at 478 keV. The counting system was calibrated for all samples by preparing a commercial standard in geometry identical to the samples.

Related references:
Baker, A.R., French, M., and K.L. Linge (2006), Trends in aerosol nutrient solubility along a west-east transect of the Saharan dust plume. Geophysical Research Letters, 33, L07805, doi:10.1029/2005GL024764.

Morton, P.L., Landing, W.M., Milne, A., et al. INTERCAL: Results from the 2008 GEOTRACES aerosol intercalibration study. Limnology and Oceanography: Methods 11, 2013, 62–78.

Wallace G.T., J.R. Fletcher and R.A. Duce (1977) Filter washing, a simple means of reducing blank values and variability in trace metal environmental samples. Journal Environmental Science and Health, AI2, 493-506.

Kadko, D. and D. Olson (1996) Be-7 as a tracer of surface water subduction and mixed layer history. Deep Sea Res. 43, 89-116.

1b:Ta26,

For data processing, please refer to:
Kadko, D. and D. Olson (1996) Be-7 as a tracer of surface water subduction and mixed layer history. Deep Sea Res. 43, 89-116.

BCO-DMO Processing:
- modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions;
- shortened Be-7 values to 5 decimal places per communication with dataset contact;
- joined to BCO-DMO EPZT master data file;
- created ISO date/time for start and end.

Additional GEOTRACES Processing:
As was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:

cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.

This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.

A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.

1c:Tdf7,From the NSF Award Abstract The mission of the International GEOTRACES Program (https://www.geotraces.org/), of which the U.S. chemical oceanography research community is a founding member, is "to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions" (GEOTRACES Science Plan, 2006). In the United States, ocean chemists are currently in the process of organizing a zonal transect in the eastern tropical South Pacific (ETSP) from Peru to Tahiti as the second cruise of the U.S.GEOTRACES Program. This Pacific section includes a large area characterized by high rates of primary production and particle export in the eastern boundary associated with the Peru Upwelling, a large oxygen minimum zone that is a major global sink for fixed nitrogen, and a large hydrothermal plume arising from the East Pacific Rise. This particular section was selected as a result of open planning workshops in 2007 and 2008, with a final recommendation made by the U.S.GEOTRACES Steering Committee in 2009. It is the first part of a two-stage plan that will include a meridional section of the Pacific from Tahiti to Alaska as a subsequent expedition. This award provides funding for management of the U.S.GEOTRACES Pacific campaign to a team of scientists from the University of Southern California, Old Dominion University, and the Woods Hole Oceanographic Institution. The three co-leaders will provide mission leadership, essential support services, and management structure for acquiring the trace elements and isotopes samples listed as core parameters in the International GEOTRACES Science Plan, plus hydrographic and nutrient data needed by participating investigators. With this support from NSF, the management team will (1) plan and coordinate the 52-day Pacific research cruise described above; (2) obtain representative samples for a wide variety of trace metals of interest using conventional CTD/rosette and GEOTRACES Sampling Systems; (3) acquire conventional JGOFS/WOCE-quality hydrographic data (CTD, transmissometer, fluorometer, oxygen sensor, etc) along with discrete samples for salinity, dissolved oxygen (to 1 uM detection limits), plant pigments, redox tracers such as ammonium and nitrite, 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-type data to the GEOTRACES Data Center (and US data centers); and (6) coordinate cruise communications between all participating investigators, including preparation of a hydrographic report/publication. Broader Impacts: The project is part of an international collaborative program that has forged strong partnerships in the intercalibration and implementation phases that are unprecedented in chemical oceanography. The science product of these collective missions will enhance our ability to understand how to interpret the chemical composition of the ocean, and interpret how climate change will affect ocean chemistry. Partnerships include contributions to the infrastructure of developing nations with overlapping interests in the study area, in this case Peru. There is a strong educational component to the program, with many Ph.D. students carrying out thesis research within the program. Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]1d:T9be,Description from NSF award abstract: In the ocean, trace elements function variously as nutrients, as contaminants from human activity, and even as convenient tracers of current and past oceanographic processes. Their biogeochemical cycling has major impacts on the ocean carbon cycle and ecosystem dynamics as well as on global climate change. Many processes influencing the distribution and behavior of trace elements in the ocean cannot be directly observed, so consequently a variety of geochemical tracers are used to provide important constraints on their rates and pathways. Beryllium-7 (Be7) is a cosmogenic (i.e., produced in the upper atmosphere) radionuclide that, because of its half-life (53.3d), can be used in the study of environmental processes occurring over seasonal timescales. This timescale is important to studies of biological production, nutrient regeneration, and atmospheric deposition, to name a few. In this project, a research team from the University of Miami will make measurements of water column Be7 along the U.S.GEOTRACES transect from Peru to Tahiti in 2013. The mission of the International GEOTRACES Program (of which the US program is a component) is "to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions." As part of the multi-institutional U.S.GEOTRACES Pacific campaign, the Miami team will address key tasks formulated within the GEOTRACES Science Plan. Specifically, they will: (1) provide realistic estimates of the underlying transport processes influencing measured trace elements of interest (TEI) distributions; they will use water column measurements of Be7 as a tracer of physical processes, such as mixing and upwelling, which redistribute biologically active species; and (2) develop and apply new Be7 methods for quantifying the atmospheric deposition of TEIs measured by other research teams participating in the campaign. Measurements of Be7 in the surface waters and in the lower atmosphere along the cruise track will provide estimates of the atmospheric input of relevant TEIs. The atmospheric input into the global ocean is an important budgetary component of numerous chemical species, yet is very difficult to constrain. The data generated in this work will be available to allow ground-truthing of aerosol deposition models and the atmospheric input of trace elements.6:["$","$L19",null,{"dataset":{"_id":"671814","description":"

Beryllium-7 aerosol concentration from GEOTRACES Peru-Tahiti section, R/V Thompson cruise TN303.

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Cruise identification

","units":{"_id":"","name":"unitless"},"type":{"_id":"1102","name":"cruise_id","description":"

cruise designation; name

"}},{"_id":"671862","name":"SECT_ID","format":"","frictionlessType":"","description":"

Cruise section identifier; EPZT = GEOTRACES East Pacific Zonal Transect. Added from BCO-DMO GEOTRACES EPZT master data file.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1954","name":"cruise_part","description":"

Identifier for a segment of a leg of a cruise, where a leg may have been broken into parts.

"}},{"_id":"671863","name":"GEOTRC_SAMPNO","format":"","frictionlessType":"","description":"

Unique 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":"671864","name":"STNNBR","format":"","frictionlessType":"","description":"

Station number; added from BCO-DMO GEOTRACES EPZT master data file.

","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":"671865","name":"GEOTRC_EVENTNO","format":"","frictionlessType":"","description":"

GEOTRACES event number; added from BCO-DMO GEOTRACES EPZT master data file.

","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":"671866","name":"julian_day","format":"","frictionlessType":"","description":"

Julian day at start of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"866","name":"julian_day","description":"

Julian day as a decimal. Julian date which is the time elapsed in days from 00:00 on January 1st 4713 BC. Julian Date (chronological).

For reference: Julian day 2440000 begins at 0000 hours, May 23, 1968.

Please note, Seabird processing software includes a \"julianday\" which is day of year. That is categorized as a separate term \"yrday\" at BCO-DMO.
\nSeabird permalink: https://blog.seabird.com/ufaqs/in-sea-bird-software-is-noon-on-january-1-julian-day-0-5-or-julian-day-1-5/

"}},{"_id":"671867","name":"day_start","format":"","frictionlessType":"","description":"

2-digit day of month at start of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"801","name":"day_start","description":"

day at beginning of measurement period, use in conjuction with day_end and only when the duration of sampling is a critical element to the measurement.

"}},{"_id":"671868","name":"month_start","format":"","frictionlessType":"","description":"

2-digit month of year at start of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"892","name":"month_start","description":"

month at start of measurement period, use in conjunction with month_end and only when the duration of sampling is a critical element to the measurement.

"}},{"_id":"671869","name":"year_start","format":"","frictionlessType":"","description":"

4-digit year at start of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1064","name":"year_start","description":"

starting year of sampling/operation, GMT

"}},{"_id":"671870","name":"time_start_utc","format":"","frictionlessType":"","description":"

Time (UTC) at start of sampling event. 24-hour clock; formatted as HHMM.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1009","name":"time_start","description":"

starting time of observation, GMT time, 24 hour clock

"}},{"_id":"671871","name":"ISO_DateTime_UTC_start","format":"","frictionlessType":"","description":"

Date and time (UTC) formatted to ISO 8601 standard. Calculated from start date and time provided. Format: YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]

","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":"671872","name":"lat_start","format":"","frictionlessType":"","description":"

Latitude at start of sampling event. North = Positive.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"870","name":"lat_start","description":"

latitude at start time of measurement; in decimal degrees (negative denotes South)

"}},{"_id":"671873","name":"lon_start","format":"","frictionlessType":"","description":"

Longitude at start of sampling event. West = Negative.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"883","name":"lon_start","description":"

longitude at starting time of measurement (west is negative), in decimal degrees

"}},{"_id":"671874","name":"day_end","format":"","frictionlessType":"","description":"

2-digit day of month at end of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"802","name":"day_end","description":"

day at ending of measurement period, see day_begin.

"}},{"_id":"671875","name":"month_end","format":"","frictionlessType":"","description":"

2-digit month of year at end of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"893","name":"month_end","description":"

month at end of measurement period, see month_start.

"}},{"_id":"671876","name":"year_end","format":"","frictionlessType":"","description":"

4-digit year at end of sampling event.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1063","name":"year_end","description":"

ending year of sampling/operation, GMT, used in conjunction with year_start

"}},{"_id":"671877","name":"time_end_utc","format":"","frictionlessType":"","description":"

Time (UTC) at end of sampling event. 24-hour clock; formatted as HHMM.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"671878","name":"ISO_DateTime_UTC_end","format":"","frictionlessType":"","description":"

Date and time (UTC) formatted to ISO 8601 standard. Calculated from end date and time provided. Format: YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]

","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":"671879","name":"lat_end","format":"","frictionlessType":"","description":"

Latitude at end of sampling event. North = Positive.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"869","name":"lat_end","description":"

latitude at end time of measurement; in decimal degrees (negative denotes South)

"}},{"_id":"671880","name":"lon_end","format":"","frictionlessType":"","description":"

Longitude at end of sampling event. West = Negative.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"884","name":"lon_end","description":"

longitude at end time of measurement; in decimal degrees (negative denotes West)

"}},{"_id":"671881","name":"air_vol","format":"","frictionlessType":"","description":"

Air volume sampled

","units":{"_id":"","name":"cubic meter (m^3)"},"type":{"_id":"1871","name":"sample_volume","description":"

volume of the sample, i.e., sample size

"}},{"_id":"671882","name":"Be_7_AER_CONC_TISCH","format":"","frictionlessType":"","description":"

Beryllium-7 (Be-7) aerosol concentration

","units":{"_id":"","name":"becquerels per cubic meter (bq/m3)"},"type":{"_id":"1951","name":"metal_conc_air","description":"

Concentration of metal elements in any phase of the atmosphere. Refer to dataset for element name and units.

"}},{"_id":"671883","name":"Be_7_AER_CONC_TISCH_ERR","format":"","frictionlessType":"","description":"

Error (+/-) associated with Be-7 measurement

","units":{"_id":"","name":"becquerels per cubic meter (bq/m3)"},"type":{"_id":"1951","name":"metal_conc_air","description":"

Concentration of metal elements in any phase of the atmosphere. Refer to dataset for element name and units.

"}}],"related_publications":[],"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/671814/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/671814/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/671814/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/671814/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[{"_id":"2022","name":"U.S. GEOTRACES","acronym":"U.S. GEOTRACES"}],"projects":[{"_id":"499723","name":"U.S. GEOTRACES East Pacific Zonal Transect (GP16)","acronym":"U.S. GEOTRACES EPZT","description":"$1c"},{"_id":"661912","name":"GEOTRACES Peru-Tahiti section: Measurement of 7Be as a Tracer of Upper Ocean Processes","acronym":"EPZT Be-7","description":"$1d"}],"archives":[],"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":168},"downloads":{"count":369}}}}]