Activities performed and samples collected during the cruises from R/V Gulf Challenger GC_GoM_2012-2013 in the Gulf of Maine; Wilkinson Basin and Jeffreys Ledge from 2012-2013 (GoM_Calanus_2012-2013 project)

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Version Date: 2014-08-29

» RAPID: Effect of a Very Low NAO Event on the Abundance of the Lipid-Rich Planktonic Copepod, Calanus finmarchicus, in the Gulf of Maine (GoM_Calanus_2012-2013)
Runge, Jeffrey A.Gulf of Maine Research Institute (GMRI)Principal Investigator
Thompson, CameronGulf of Maine Research Institute (GMRI)Contact
Allison, DickyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Dataset Description

Between April 6th 2012 and May 21st 2013, there were 17 deployments on the R/V Gulf Challenger as part of the time series.  This dataset table lists the samples taken during each cruise.

Acquisition Description

See each dataset for the description of the protocol of collection.

Processing Description

See each dataset for the protocol of processing.

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stationEither the Jeffreys ledge station WB-5 or Wilkinson Basin WB-7 text
sitedescriptive text for station text
latlatitude decimal degrees; North is positive
lonlongitude decimal degrees; West is negative
yrday_localday of year local time number
date_localtwo digit date local time mmddyyyy
month_localtwo digit month local time mm
day_localtwo digit day local time dd
yearfour digit year yyyy
numCTDsampsNumber of CTD casts completed and available number
numChlsampsNumber of water sample filters analyzed for Chlorophyll a and Phaeopigments number
numFormsampsNumber of net samples preserved in 4% formaldehyde number
numETOHsampsNumber of net samples preserved in 95% ethanol number
numCfinsampsNumber of samples analyzed for Calanus finmarchicus abundance number
numZoopsampsNumber of samples analyzed for zooplankton species composition and abundance number
cruise_nomEach deployment has its own cruise ID following this format; GC for R/V Gulf Challenger; followed by the date (mmddyy) text

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R/V Gulf Challenger
Start Date
End Date
This deployment is a collection of 17 one-day cruises to two stations in the Gulf of Maine between April 6, 2012 to May 21, 2013.

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Project Information

RAPID: Effect of a Very Low NAO Event on the Abundance of the Lipid-Rich Planktonic Copepod, Calanus finmarchicus, in the Gulf of Maine (GoM_Calanus_2012-2013)

Coverage: Gulf of Maine: Wilkinson Basin and Jeffrey's Ledge

"The copepod, Calanus finmarchicus, is a dominant member of the plankton in the Gulf of Maine, (GoM), despite its location at the southern edge of the species' subarctic range. Wilkinson Basin, one of the three deep basins in the GoM, harbors very high concentrations of the early developmental stages of C. finmarchicus in the summer through winter and serves as a source of C. finmarchicus to GoM coastal ledges and banks. A recent study based on C. finmarchicus habitat characteristics across the North Atlantic predicts that climate-driven change will force the distribution of C. finmarchicus northward out of the GoM over the next several decades. However, the oceanographic and life history responses of C. finmarchicus to environmental variability in the Gulf are complex and largely unknown. The research in this RAPID proposal takes advantage of a rare opportunity to test a hypothesis about the control of C. finmarchicus abundance in the GoM from climate change related external forcing. The hypothesis states that a distinctly lower C. finmarchicus abundance follows, with a two-year lag, the occurrence of a very negative North Atlantic Oscillation (NAO). The specific processes that causally connect low C. finmarchicus with the NAO are not known. The research here tests the prediction that C. finmarchicus abundance will be very low in Wilkinson Basin in 2012, two years after one of the most negative NAOs on record, dating back to the 1860?s. Field observations in the form of a time series of measurements of hydrography, food availability and C. finmarchicus stage abundance will be taken at a fixed station in Wilkinson Basin and in the Maine coastal region, supported by measurements taken on the Scotian Shelf. A research survey, coordinated with a scheduled cruise in the Gulf of Maine in September, 2012, will take additional collections in Wilkinson Basin and throughout the GoM. Frozen and ethanol preserved samples of C. finmarchicus will also be collected for population genetic studies. The abundance results will be compared with historical time series and survey data collected over the past two decades, confirming or refuting the expectation of extreme NAO influence on GoM C. finmarchicus populations." (from the Award abstract)

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Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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