| Contributors | Affiliation | Role |
|---|---|---|
| Cutter, Gregory A. | Old Dominion University (ODU) | Chief Scientist |
| Chandler, Cynthia L. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
Cruise track data from ship's underway sampling system.
XYT cruise track data extracted from from ships underway sampling system (*.CSV files) using BCO-DMO perl script.
| File |
|---|
cruise_track_IC2.csv (Comma Separated Values (.csv), 30.52 KB) MD5:c84a992f8ebc8b7ca2c0c0424dae51f1 Primary data file for dataset ID 3833 |
| Parameter | Description | Units |
| cruise_ID | cruise identification code | dimensionless |
| date_uway | date as YYYY/MM/DD (GMT) | dimensionless |
| time_uway | time (GMT) as HH:MM:SS | dimensionless |
| latitude | latitude; North is positive; negative denotes South | decimal degrees |
| longitude | longitude; negative denotes West; East is positive | decimal degrees |
| Website | |
| Platform | R/V Knorr |
| Start Date | 2009-05-06 |
| End Date | 2009-05-29 |
| Description | GEOTRACES intercalibration cruise 2 (May 2009)
GEOTRACES completed the first Intercalibration cruise from June 8 to July 12, 2008, collecting water and particle samples for analysis and intercalibration. The second intercalibration cruise is planned for May 2009 in the eastern North Pacific and will include sampling near the North Pacific SAFe Station at 30°N 140°W, and the Santa Barbara Basin, 34.25°N 120°W.
This International GEOTRACES intercalibration exercise aims to provide reference materials that could be distributed to the international community and reference profiles of Trace Elements and their Isotopes to ensure compatibility and consistency of GEOTRACES data.
Sampling Activities: for full details see cruise synopsis or cruise report when available
Pre-cruise Sampling Activity Summary: This is a 'trace metal clean' cruise, during which the researchers plan to use the following sampling devices and gear:
ship's standard CTD with 24x10L Niskin bottle rosette
Ken Buesseler's McLane in situ pumps and MITESS vane samplers
a trace metal-clean GEOTRACES carousel with GO-Flo bottles (like the one used during IC 1 in 2008. This will be deployed using the newly developed method described by Glosten Associates. The plan is to use this system for up to 10 casts per day.
a towed/stationary fish (depressor and weighted torpedo) for pumping trace metal clean water to the MLML sampling and GEOTRACES clean vans, deployed using our aluminum pivoting boom just like in 2008. We will be testing several different towed fish during the transits.
Jim Bishop's MULFVS pumping system (http://www-ocean.lbl.gov/MULVFSops.html)
An EOS paper (Johnson, 2007) describes the SAFe station and efforts to establish the SAFe dissolved Fe in seawater standards.
K.S. Johnson et al. 2007. Developing standards for dissolved iron in seawater, EOS 88 (11), pp. 131-132 (http://boyle.mit.edu/~ed/PDFs/Johnson(2007)EOS88_131.pdf)
Cruise information and original data are available from the NSF R2R data catalog. |
An international intercalibration effort has been assigned a high priority during the initial phase of GEOTRACES to ensure that results from different cruises, and from different labs, can be compared in a meaningful way.
While the original data from the Intercalibration cruises are not available online, consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: Standards and Reference Materials
The ultimate goal for the intercalibration component of the international GEOTRACES program is to achieve the best accuracy possible (lowest random and systematic errors) for the suite of GEOTRACES' Trace Elements and Isotopes (TEI) as a prelude to the sampling program, and continuing effort throughout the sampling and analysis program. To achieve this goal, there will be two primary efforts:
(1) Evaluate and develop GEOTRACES sample acquisition, handling, and storage protocols during initial Intercalibration Cruises;
(2) Identify existing GEOTRACES primary standards and certified reference materials (CRMs) for the TEI suite (and where needed, producing reference materials or primary standards), including the establishment of GEOTRACES Baseline Stations that can be used to evaluate accuracy from sampling to analysis (to facilitate intercalibration for TEIs that do not have CRMs).
Tentative schedule of Intercalibration events:
• June - July 2008. 1st Intercalibration cruise (Sargasso Sea): evaluate sampling apparati and handling methods (diss and part), collect and distribute intercalibration samples, sample storage experiments, establish Baseline Station at BATS
• Dec. 2008. Second Intercalibration workshop (AGU): evaluate and interpret intercalibration results, planning for 2nd cruise
• Spring 2009. 2nd Intercalibration cruise (eastern North Pacific): final testing of complete sampling system and procedures, intercalibrate with other (non-US) sampling systems, speciation + total TEI intercalibration, determine the time to occupy one GEOTRACES station (for cruise planning purposes)
• Jan.-Feb 2010. Third Intercalibration workshop: finalize complete intercalibration results, begin assembling GEOTRACES User Manuals
GEOTRACES intercalibration cruise 1 June 2008
GEOTRACES completed the first Intercalibration cruise from June 8 to July 12, 2008 to collect intercalibration water and particle samples. This intercalibration exercise aimed to provide reference materials that could be distributed to the international community and reference profiles of Trace Elements and their Isotopes to ensure compatibility and consistency of GEOTRACES data.
GEOTRACES intercalibration cruise 2 May 2009
The second intercalibration cruise is planned for May 2009 in the eastern North Pacific and will include sampling near the North Pacific SAFe Station at 30°N, 140°W.
If you are interested in participating in this exercise, note that selected samples for intercalibration will also be available after the cruise. For general information about the intercalibration effort please contact Greg Cutter.
GEOTRACES is a SCOR sponsored program; and funding for program infrastructure development is provided by the U.S. National Science Foundation.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.