Project: U.S. GEOTRACES East Pacific Zonal Transect (GP16)

Acronym/Short Name:U.S. GEOTRACES EPZT
Project Duration:2012-06 - 2015-06
Geolocation:Eastern Tropical Pacific - Transect from Peru to Tahiti (GP16)

Description

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]


DatasetLatest Version DateCurrent State
Nitrite (NO2-) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 20132024-07-30Final no updates expected
Nitrous oxide (N2O) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 20132024-07-24Final no updates expected
Dissolved neodymium (Nd) isotopes and concentrations of rare-earth elements (REEs) reported by LDEO in seawater samples collected during the GEOTRACES GP16 East Pacific Zonal Transect cruise (TN303) on R/V Thomas G. Thompson from October to December 20132023-12-19Final no updates expected
Dissolved Gallium (Ga) from R/V Thomas G. Thompson cruise TN303 (GP16) in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2020-12-15Final no updates expected
Lead (Pb) isotope ratios from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to November 20132020-11-20Final no updates expected
Concentrations of dissolved aluminum (Al) in samples collected during the U.S. GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) from October to December 20132020-07-30Final with updates expected
Concentrations of soluble and dissolved iron (Fe) and iron isotope ratios from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific during November & December 20132020-07-16Final no updates expected
Particulate Th-234 from in-situ pumps, including large size fraction (> 51 um) and small size fraction (1-51 um), from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2020-06-11Final no updates expected
Water-column total Th-234 from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2020-06-11Final no updates expected
Acetic acid leachable trace metals from bulk aerosol samples collected during the US GEOTRACES EPZT section cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 20132020-05-26Final no updates expected
Total particulate trace element concentrations from bulk aerosol samples collected during the US GEOTRACES EPZT section cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 20132020-05-26Final no updates expected
Dissolved REE concentrations and Nd isotopes reported by OSU researchers from samples collected on the GEOTRACES EPZT R/V Thomas G. Thompson cruise TN303 from November to December 20132020-01-23Final no updates expected
Copper speciation results for dissolved organic copper binding ligand concentrations, stability constants, and free copper from the U.S. GEOTRACES Equatorial Pacific cruise (R/V Thomas G. Thompson TN303) from October to December 20132019-09-23Final no updates expected
X-ray absorption spectroscopy data for particulate iron from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific from October to December 20132018-10-10Preliminary and in progress
Profiles of stable isotopes of silicon in silicic acid from the US GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 20132018-09-11Final no updates expected
Results from Optimum Multiparameter Water Mass Analysis (OMPA) obtained using temperature, salinity, nutrient, and oxygen data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific from October to December 20132017-08-17Final no updates expected
Nitrate (NO3) aerosol isotopes from the U.S. GEOTRACES EPZT cruise TN303 on R/V Thomas G. Thompson in the Eastern Tropical Pacific from October to December 20132017-07-25Final no updates expected
CFC-12, CFC-11, CFC-113, and SF6 concentration from US GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 20132017-07-24Final no updates expected
Concentrations of dissolved manganese (Mn) in water-column samples from major stations that were occupied during the U.S. GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) from October to December 20132017-06-30Final no updates expected
DI water soluble trace element concentrations from bulk aerosol samples collected during the 2013 US GEOTRACES EPZT section cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific2017-06-13Final no updates expected
HPLC pigments along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2017-05-16Final no updates expected
Seawater Inorganic Carbon Data (DIC) from the R/V Thomas G. Thompson TN303 cruise in the Eastern Tropical Pacific from October to December 2013 (U.S. GETORACES EPZT project)2017-05-03Final no updates expected
Core-top (0-1cm) sediment data collected by monocore from R/V Thomas G. Thompson TN303 (GP16; EPZT) GEOTRACES cruise from November to December 2013 (GEOTRACES EPZT project)2017-04-06Final no updates expected
Dissolved Fe, Mn, Cd, Cu and Zn concentrations from bottle samples during the R/V Thomas G. Thompson TN303 GEOTRACES EPZT cruise in the Eastern Tropical Pacific from November to December 2013 (U.S. GEOTRACES EPZT)2017-03-21Final no updates expected
Helium Isotopes and Noble Gas Concentrations from the 2013 Eastern Pacific Zonal Transect cruise on R/V Thomas G. Thompson (TN303) (US GEOTRACES EPZT project)2017-03-02Final no updates expected
Depth profiles of seawater dissolved 232Th, 230Th, and 231Pa during the GEOTRACES Equatorial Pacific Zonal Transect on cruise TN303 during 20132017-01-31Final no updates expected
The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 20132017-01-26Final no updates expected
Small and large particulate Th and Pa samples from different depth profiles collected on R/V Thomas G. Thompson in the Eastern Tropical Pacific during 2013 (EPZT Th Pa project)2017-01-24Final no updates expected
Particulate Po-210 and Pb-210 data from US GEOTRACES East Pacific Zonal Transect from R/V Thomas G. Thompson TN303, from Peru to Tahiti, October to December 2013 (U.S. GEOTRACES EPZT project)2017-01-24Final no updates expected
Aerosols analyzed for Pb-210 collected on R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific from October to December 2013 (U.S. GEOTRACES EPZT project)2017-01-09Final no updates expected
Size-fractionated major and minor particle composition and concentration collected from RV Thompson (TN303) along the US GEOTRACES EPZT transect in the Eastern Tropical Pacific during 2013 (US GEOTRACES EPZT project)2017-01-03Final no updates expected
Arsenate, iodide, and selenium concentrations collected from Super-GeoFish during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)2017-01-03Final no updates expected
Arsenate, iodide, and selenium concentrations collected from Go-FLO bottles during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)2017-01-03Final no updates expected
Beryllium-7 aerosol concentration from GEOTRACES Peru-Tahiti section on R/V Thomas G. Thompson cruise TN303 from October to December 20132016-12-29Final no updates expected
Dissolved copper, nickel, manganese, and vanadium from GeoFISH and bottle samples during the R/V Thomas G. Thompson cruise TN303 (GP16) from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)2016-12-20Final no updates expected
Water-column dissolved iron (Fe) concentrations for major stations occupied during U.S. GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) from October to December 2013; post-cruise analyses conducted at Old Dominion University2016-12-19Final no updates expected
Particulate iron (pFe) isotope concentrations from the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 20132016-12-09Final no updates expected
Dissolved iron speciation from 2013 U.S. GEOTRACES Eastern Pacific Zonal Transect from R/V Thomas G. Thompson TN303 from October-December 2013 (U.S. GEOTRACES EPZT project, EPZT Fe Cu Co project)2016-12-07Final no updates expected
Dissolved trace metal concentrations from a GO-FLO rosette collected during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)2016-11-29Final no updates expected
Beryllium-7 (Be-7) measurements from samples collected on R/V Thomas G. Thompson (TN303) in the Eastern Tropical Pacific from October to December 2013 (U.S. GEOTRACES EPZT project)2016-11-18Final no updates expected
Mercury speciation across the US GEOTRACES East Pacific Zonal Transect, from cruise TN303, 20132016-11-18Final no updates expected
Tritium Concentrations from the 2013 Eastern Pacific Zonal Transect cruise on R/V Thomas G. Thompson (TN303) (US GEOTRACES EPZT project)2016-11-15Final no updates expected
Radiocarbon DelC14 from the 2013 Eastern Pacific Zonal Transect cruise on R/V Thomas G. Thompson (TN303) (US GEOTRACES EPZT project)2016-11-15Final no updates expected
Dissolved Barium (Ba) from R/V Thomas G. Thompson cruise TN303 (GP16) in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2016-11-10Final no updates expected
Dissolved molybdenum data from GeoFISH and Bottle samples from R/V Thomas G. Thompson TN303 (GP16) in the Eastern Tropical Pacific (Transect from Peru to Tahiti) from November to December 20132016-11-10Final no updates expected
Element quotas of individual phytoplankton cells from GEOTRACES-EPZT cruise TN303, 2013.2016-07-19Final no updates expected
Dissolved Pb passing through a 0.2 um Acropak capsule filter from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2016-07-14Final no updates expected
Total dissolved cobalt and labile cobalt concentrations from the US GEOTRACES EPZT cruise TN303 on R/V Thomas G. Thompson from October to December 20132016-07-01Final no updates expected
Radium isotopes collected on R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2016-06-29Final with updates expected
Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2016-06-24Final no updates expected
Dissolved (0.4 micron filtered) Fe, Zn and Cd isotope ratios and concentrations across GEOTRACES-EPZT, from cruise TN303, 20132016-06-21Final no updates expected
Suspended particulate total mercury and monomethylmercury across the US GEOTRACES East Pacific Zonal Transect, from cruise TN303, 20132016-06-14Final no updates expected
Dissolved Po-210 and Pb-210 from GEOTRACES-EPZT cruise TN303, 20132016-06-13Final no updates expected
Trace element concentrations in suspended particles collected from the GeoFISH during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)2016-06-09Final with updates expected
Dissolved Organic Carbon (DOC) measurements from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2016-06-08Final no updates expected
Particulate Acid-Volatile Sulfide (pAVS) and elemental selenium (pSe) concentrations from a McLane pump collected during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project)2016-06-03Final no updates expected
Dissolved lead (Pb) along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the Eastern Tropical Pacific, Peru to Tahiti during 20132016-06-03Final no updates expected
BCO-DMO-created "master" file of sampling events from the GEOTRACES EPZT cruise, R/V Thomas G. Thompson TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)2016-06-02Final no updates expected
Pump nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2016-06-02Final no updates expected
Trace elements in suspended particles from GO-Flo bottles2016-05-17Final no updates expected
Cast events summary table associated with the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
ODF CTD up casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final with updates expected
GTC bottle data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
CFC saturation along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
PUMP cast logs associated with the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
GTC CTD up casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
Cast events summary table (html) associated with the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
CTD cast logs associated with the US GEOTRACES East Pacific Zonal Transect cruise from the R/V Thomas G. Thompson TN303 in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
ODF bottle data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final with updates expected
GeoFish nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
GTC shipboard CTD data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
CTD sample logs associated with the US GEOTRACES East Pacific Zonal Transect cruise from the R/V Thomas G. Thompson TN303 in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
ODF CTD down casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final with updates expected
Scientific sampling event log associated with the US GEOTRACES East Pacific Zonal Transect cruise from R/V Thomas G. Thompson TN303 in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
GeoFish cast logs associated with the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
GTC CTD down casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-10-30Final no updates expected
Cruise report associated the US GEOTRACES East Pacific Zonal Transect R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-08-15Final no updates expected
Cruise personnel associated with the US GEOTRACES East Pacific Zonal Transect cruise R/V Thomas G. Thompson TN303 in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-07-02Final no updates expected
Cruise track image associated with the US GEOTRACES East Pacific Zonal Transect cruise R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-07-02Final no updates expected
Cruise track along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project)2014-05-08Final no updates expected

Project Home Page



People

Lead Principal Investigator: James W. Moffett
University of Southern California (USC-HIMS)

Co-Principal Investigator: Gregory A. Cutter
Old Dominion University (ODU)

Co-Principal Investigator: Christopher R. German
Woods Hole Oceanographic Institution (WHOI)

Contact: James W. Moffett
University of Southern California (USC)


Programs

U.S. GEOTRACES [U.S. GEOTRACES]