| Contributors | Affiliation | Role |
|---|---|---|
| Runge, Jeffrey A. | Gulf of Maine Research Institute (GMRI) | Principal Investigator |
| Thompson, Cameron | Gulf of Maine Research Institute (GMRI) | Contact |
| Allison, Dicky | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
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.
See each dataset for the description of the protocol of collection.
See each dataset for the protocol of processing.
| File |
|---|
WBTS_timeseries_log.csv (Comma Separated Values (.csv), 2.63 KB) MD5:5b07431fd394bc0e2062c06d7831fcc4 Primary data file for dataset ID 526995 |
| Parameter | Description | Units |
| station | Either the Jeffreys ledge station WB-5 or Wilkinson Basin WB-7 | text |
| site | descriptive text for station | text |
| lat | latitude | decimal degrees; North is positive |
| lon | longitude | decimal degrees; West is negative |
| yrday_local | day of year local time | number |
| date_local | two digit date local time | mmddyyyy |
| month_local | two digit month local time | mm |
| day_local | two digit day local time | dd |
| year | four digit year | yyyy |
| numCTDsamps | Number of CTD casts completed and available | number |
| numChlsamps | Number of water sample filters analyzed for Chlorophyll a and Phaeopigments | number |
| numFormsamps | Number of net samples preserved in 4% formaldehyde | number |
| numETOHsamps | Number of net samples preserved in 95% ethanol | number |
| numCfinsamps | Number of samples analyzed for Calanus finmarchicus abundance | number |
| numZoopsamps | Number of samples analyzed for zooplankton species composition and abundance | number |
| cruise_nom | Each deployment has its own cruise ID following this format; GC for R/V Gulf Challenger; followed by the date (mmddyy) | text |
| Website | |
| Platform | R/V Gulf Challenger |
| Report | |
| Start Date | 2012-04-06 |
| End Date | 2013-05-21 |
| Description | 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. |
"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)
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) |