Bottle data from the GEOTRACES Clean Carousel sampling system (GTC) on the Arctic Section cruise (HLY1502) from August to October 2015 (U.S. GEOTRACES Arctic project)

Data Type: Cruise Results
Version: 4
Version Date: 2019-07-29

» U.S. Arctic GEOTRACES Study (U.S. GEOTRACES Arctic)

Cutter, GregoryOld Dominion University (ODU)Principal Investigator
Kadko, David C.Florida International University (FIU)Principal Investigator
Landing, William M.Florida State University (FSU - EOAS)Principal Investigator, Contact
Copley, NancyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Bottle data from the GEOTRACES Clean Carousel sampling system (GTC) on the Arctic Section cruise (HLY1502) from August to October 2015.


Spatial Extent: N:89.995 E:179.5926 S:60.1727 W:-179.8082
Temporal Extent: 2015-08-12 - 2015-10-07

Dataset Description

Bottle data from the GTC CTD using the GEOTRACES Clean Carousel sampling system (GTC), GEOTRACES Arctic cruise HLY1502.

GTC CTD BOTTLE file name from the Scripps Oceanographic Data Facility (ODF): 20160609ODU

Note: 'FLAG_W' columns correspond to the WHP (WOCE Hydrographic Program) quality flag scheme.

Acquisition Description

The Go-Flo bottles were rearranged between casts to eliminate the possibility of sampling bias. See the HLY1502 cruise report for more information on data acquisition.

NOTE: Station 4 cast 3 was abandoned due to non-tripped bottles (note the BTLNBR_FLAG_W values of "9") and repeated as Station 4 cast 5 using the same sample numbers. Disregard information for samples 10611, 10610, 10609, 10608, 10607, and 10606 where CASTNO = 3.

Processing Description

Version history:
2019-07-29: version 4: removed all "placeholder" columns containing no data (-999 only). These columns were included in the original files from ODF to indicate the expected datasets. All data reported from the cruise can by found on the HLY1502 cruise page or on the U.S. Arctic GEOTRACES project page.

2017-05-01: new version (3) served on 2017-05-01] replaces v2: 2016-06-09. Event 6079 was revised and event 6369 was added back to the file. It was present in version 2016-05-17 but missing in version 2016-06-09. SOLUBLE_TH and SOLUBLE_TH_FLAG_W contain no data so blanks were replaced with nd for 'no data'.

2016-06-09: new version (2) served [2016-06-09], replaces v:2016-05-17.

2016-05-17: version 1 served.

BCO-DMO Processing:
- added conventional header with dataset name; PI name; version date;
- added cruise_id column;
- reformatted time as HHMM;
- changed all hyphen, slash, and decimal points in parameter names to underscores (changed TH-232_COLL_0.02MICR to TH_232_COLL_02MICR);
- hour=2400 not legal time; changed day by one and time to 0000 (only for station 41/cast 3/event 6277);
- ZN_DISS and ZN_DISS_FLAG_W duplicated - removed pair with no data;
- 2019-07-29: removed all "placeholder" columns containing no data (-999 only); a list of the removed columns available as a tab-separated file: GTC_Bottle_Removals_20190729.tsv

[ table of contents | back to top ]


cruise_idcruise identification unitless
EXPOCODEexpedition code assigned by the CCHDO: NODCShipCodeYearMonthDay unitless
SECT_IDcruise section identification number unitless
STNNBRstation number unitless
CASTNOcast number unitless
SAMPNOsequential sample number within a cast unitless
BTLNBRBottle Number unitless
BTLNBR_FLAG_WBottle Quality Flag unitless
DATEStation Date (GMT); format is YYYYMMDD unitless
TIMEStation Time (GMT); format is HHMM unitless
ISO_DateTime_UTCDate/Time (ISO8601 formatted); format is YYYY-MM-DDTHH:MM:SS[.xx]Z unitless
LATITUDEStation Latitude (South is negative) decimal degrees
LONGITUDEStation Longitude (West is negative) decimal degrees
CTDPRSCTD pressure decibars
CTDDEPTHCTD depth: Fofonoff-Millard depth (non-integrated; also used by SBE) meters
CTDTMPCTD temperature; ITS-90 degrees celsius
CTDSALCTD salinity PSS-78
CTDSAL_FLAG_WCTD salinity quality flag unitless
SALNTYsalinity PSS-78
SALNTY_FLAG_Wsalinity quality flag unitless
SALTREFsalinity reference ?? G/KG
SALTREF_FLAG_Wsalinity reference quality flag unitless
CTDOXY_FLAG_WCTD oxygen quality flag unitless
BTMDEPTHBottom Depth meters corrected
SILCAT_FLAG_WSILCAT quality flag unitless
NITRAT_FLAG_Wnitrate quality flag unitless
NITRIT_FLAG_Wnitrite quality flag unitless
PHSPHT_FLAG_Wphosphate quality flag unitless
AL_UHAL Uhawaii lab NMOL/L
AL_UH_FLAG_WAL_UH quality flag unitless
MN_UHMN Uhawaii lab NMOL/L
MN_UH_FLAG_WMN_UH quality flag unitless
FE_UHFE Uhawaii lab NMOL/L
FE_UH_FLAG_WFE_UH quality flag unitless
HG_TOTAL_FLAG_WHG total quality flag unitless
HG_ELEMENTAL_FLAG_WHG elemental quality flag unitless
HG_DM_FLAG_WHG DM quality flag unitless
COLLOIDAL_HG_FLAG_Wcolloidal HG quality flag unitless
ZN_DISS_FLAG_WZN dissolved quality flag unitless
BTL_DATEBottle Date (GMT); format is YYYYMMDD years days months
BTL_TIMEBottle Time (GMT); format is HHMM unitless
BTL_LATBottle Latitude (South is negative) decimal degrees
BTL_LONBottle Longitude (West is negative) decimal degrees

[ table of contents | back to top ]


Dataset-specific Instrument Name
Generic Instrument Name
Niskin bottle
Generic Instrument Description
A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24 or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Dataset-specific Instrument Name
Generic Instrument Name
GO-FLO Teflon Trace Metal Bottle
Dataset-specific Description
CTD bottle data from 30-ODF/SIOR (Ocean Data Facility 12 bottle, 30 liter Niskin rosette) and GEOTRACES Clean Carousel sampling system (GTC).
Generic Instrument Description
GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.

Dataset-specific Instrument Name
Generic Instrument Name
CTD Sea-Bird SBE 911plus
Dataset-specific Description
The system included a Dynacon winch with 7300 m of Vectran cable with conductors, clean lab, and Seabird carousel/CTD with 24 12L GO-FLO bottles (and 14 spares), GO-FLO bottles.
Generic Instrument Description
The Sea-Bird SBE 911plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9plus and SBE 11plus is called a SBE 911plus. The SBE 9plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3plus and SBE 4). The SBE 9plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

[ table of contents | back to top ]



Start Date
End Date
US GEOTRACES Arctic cruise: The cruise began in Dutch Harbor, Alaska on 08 October 2015. After a station in the Bering Sea, Healy cruised to the North Pole on a westerly track before returning to the Canadian margin on an easterly track, returning to Dutch Harbor on 10 October 2015.

[ table of contents | back to top ]

Project Information

U.S. Arctic GEOTRACES Study (U.S. GEOTRACES Arctic)

Coverage: Arctic Ocean; Sailing from Dutch Harbor to Dutch Harbor

Description from NSF award abstract: In pursuit of its goal "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", in 2015 the International GEOTRACES Program will embark on several years of research in the Arctic Ocean. In a region where climate warming and general environmental change are occurring at amazing speed, research such as this is important for understanding the current state of Arctic Ocean geochemistry and for developing predictive capability as the regional ecosystem continues to warm and influence global oceanic and climatic conditions. The three investigators funded on this award, will manage a large team of U.S.scientists who will compete through the regular NSF proposal process to contribute their own unique expertise in marine trace metal, isotopic, and carbon cycle geochemistry to the U.S. effort. The three managers will be responsible for arranging and overseeing at-sea technical services such as hydrographic measurements, nutrient analyses, and around-the-clock management of on-deck sampling activites upon which all participants depend, and for organizing all pre- and post-cruise technical support and scientific meetings. The management team will also lead educational outreach activities for the general public in Nome and Barrow, Alaska, to explain the significance of the study to these communities and to learn from residents' insights on observed changes in the marine system. The project itself will provide for the support and training of a number of pre-doctoral students and post-doctoral researchers. Inasmuch as the Arctic Ocean is an epicenter of global climate change, findings of this study are expected to advance present capability to forecast changes in regional and globlal ecosystem and climate system functioning. As the United States' contribution to the International GEOTRACES Arctic Ocean initiative, this project will be part of an ongoing multi-national effort to further scientific knowledge about trace elements and isotopes in the world ocean. This U.S. expedition will focus on the western Arctic Ocean in the boreal summer of 2015. The scientific team will consist of the management team funded through this award plus a team of scientists from U.S. academic institutions who will have successfully competed for and received NSF funds for specific science projects in time to participate in the final stages of cruise planning. The cruise track segments will include the Bering Strait, Chukchi shelf, and the deep Canada Basin. Several stations will be designated as so-called super stations for intense study of atmospheric aerosols, sea ice, and sediment chemistry as well as water-column processes. In total, the set of coordinated international expeditions will involve the deployment of ice-capable research ships from 6 nations (US, Canada, Germany, Sweden, UK, and Russia) across different parts of the Arctic Ocean, and application of state-of-the-art methods to unravel the complex dynamics of trace metals and isotopes that are important as oceanographic and biogeochemical tracers in the sea.

[ table of contents | back to top ]

Program Information


Coverage: Global

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.

[ table of contents | back to top ]


Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)
NSF Division of Ocean Sciences (NSF OCE)
NSF Division of Ocean Sciences (NSF OCE)
NSF Division of Ocean Sciences (NSF OCE)

[ table of contents | back to top ]