| Contributors | Affiliation | Role |
|---|---|---|
| Arrigo, Kevin R. | Stanford University | Principal Investigator |
| van Dijken, Gert | Stanford University | Contact |
| Gegg, Stephen R. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
Cruise track generated from MGDS:Nav files
Cruise Id, Date/Time UTC, Lat, Lon, SOG, COG
1 minute fixes
Data DOI: 10.1594/IEDA/312431
Processed ship-based Navigation Data from the Amundsen Sea, Antarctica acquired during the Nathaniel B. Palmer expedition NBP0901 (2009)
This data set was acquired with a ship-based Navigation system during Nathaniel B. Palmer expedition NBP0901 conducted in 2009 (Chief Scientist: Dr. Stan Jacobs). These data files are of MGDS:Nav format and include Primary Navigation data and were processed after data collection. Data were acquired as part of the project(s): Collaborative International Research: Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise, Shedding dynamic light on iron limitation: The interplay of iron limitation and dynamic irradiance conditions in governing the phytoplankton distribution in the Ross Sea, and Collaborative Research: Sampling the ocean - sea ice interaction in the Pacific center of the Antarctic Dipole, and funding was provided by NSF grant(s): OPP06-32282.
Quality 1 - A level of processing has been undertaken, ensuring quality control (e.g. ping edited sonar data, edited navigation data).
BCO-DMO Processing Notes
- Generated from NBP0901 Primary Navigation data (quality version 2) downloaded 6 February 2015 from the Marine GeoScience Data System (MGDS)
- Awk routine generated to reformat original files into BCO-DMO servable file format
- Awk routine: "MGDS_Nav_2_CruiseTrack.awk"
- Parameter names generated to conform to BCO-DMO naming convention found at Choosing Parameter Name
- Date/Time reformatted to ISO DateTime format
- Cruise Id added to data
- SOG and COG values not reported in original files
- SOG and COG (both set to 0.0) added to each data record for compatibility with other BCO-DMO cruise track datasets
| File |
|---|
CruiseTrack.csv (Comma Separated Values (.csv), 3.82 MB) MD5:4ed380615108215076d0ff8c6619b4c3 Primary data file for dataset ID 631142 |
| Parameter | Description | Units |
| CruiseId | Official UNOLS cruise id | text |
| ISO_DateTime_UTC | ISO formatted UTC Date and Time | YYYY-MM-DDTHH:MM:SSZ |
| Latitude | Latitude Position (South is negative) | decimal degrees |
| Longitude | Longitude Position (West is negative) | decimal degrees |
| SOG | Instantaneous Speed-over-ground | meters/sec |
| COG | Instantaneous Course-over-ground [deg. clockwise from North] | decimal degrees |
| Dataset-specific Instrument Name | GPS |
| Generic Instrument Name | Global Positioning System Receiver |
| Dataset-specific Description | This data set was acquired with a ship-based Navigation system |
| Generic Instrument Description | The Global Positioning System (GPS) is a U.S. space-based radionavigation system that provides reliable positioning, navigation, and timing services to civilian users on a continuous worldwide basis. The U.S. Air Force develops, maintains, and operates the space and control segments of the NAVSTAR GPS transmitter system. Ships use a variety of receivers (e.g. Trimble and Ashtech) to interpret the GPS signal and determine accurate latitude and longitude. |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 2009-01-05 |
| End Date | 2009-02-26 |
| Description | Three international science projects were accommodated on NB Palmer cruise 09-01. O-274, entitled
’Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise,’ (S Jacobs, A Jenk-
ins & H Hellmer, PIs) seeks to better understand ocean forcing on ice shelf, ice stream and sea ice change,
and the sources of ocean freshening. Its several related subcomponents included setting out time series
moorings to record temperature, salinity and currents over a period of two years; repeat profiling of water
column properties on and near the Amundsen continental shelf; using the UK ’Autosub’ to map thermoha-
line properties, currents and dimensions of the Pine Island Ice Shelf cavity; modeling the ocean circulation;
sampling the sea ice, setting out drifters and mass balance buoys and recording sea ice properties underway;
swath-mapping the sea floor; and outreach photography and video. B-244, ’Shedding Dynamic Light on Iron
Limitation,’ (K Arrigo, PI), a US/Netherlands/Canada project, sampled surface and subsurface waters to
300 m with trace metal clean equipment/methods to assess the influence of iron and light on phytoplankton
productivity and species distribution. The goal of O-261, ’Sampling the ocean-sea ice interaction in the
Pacific center of the Antarctic Dipole,’ (X Yuan and J Sprintall, PIs) was to set a deep mooring northwest of
the Amundsen Sea continental shelf to monitor the upper ocean role and response in ENSO teleconnections,
complemented by German work near the Atlantic Dipole in the Weddell Sea.
CruiseTrack and Stations Image |
IPY: Shedding dynamic light on iron limitation: The interplay of iron limitation and dynamic irradiance in governing the phytoplankton distribution in the Ross Sea
The Southern Ocean plays an important role in the global carbon cycle, accounting for approximately 25% of total anthropogenic CO2 uptake by the oceans, mainly via primary production. In the Ross Sea, primary production is dominated by two taxa that are distinct in location and timing. Diatoms dominate in the shallow mixed layer of the continental shelf, whereas the colony forming Phaeocystis antarctica (Prymnesiophyceae) dominate in the more deeply mixed, open regions. Significantly, both groups have vastly different nutrient utilization characteristics, and support very different marine food webs. Their responses to climate change, and the implications for carbon export, are unclear. Previous studies show that light availability and the quality of the light climate (static versus dynamic) play a major role in defining where and when the different phytoplankton taxa bloom. However, iron (Fe) limitation of the algal communities in both the sub-Arctic and the Southern Ocean is now well documented. Moreover, phytoplankton Fe demand varies as a function of irradiance. The main hypothesis of the proposed research is: The interaction between Fe limitation and dynamic irradiance governs phytoplankton distributions in the Ross Sea. Our strategy to test this hypothesis is three-fold: 1) The photoacclimation of the different phytoplankton taxa to different light conditions under Fe limitation will be investigated in experiments in the laboratory under controlled Fe conditions. 2) The photophysiological mechanisms found in these laboratory experiments will then be tested in the field on two cruises with international IPY partners. 3) Finally, data generated during the lab and field parts of the project will be used to parameterize a dynamic light component of the Coupled Ice Atmosphere and Ocean (CIAO) model of the Ross Sea. Using the improved model, we will run future climate scenarios to test the impact of climate change on the phytoplankton community structure, distribution, primary production and carbon export in the Southern Ocean. The proposed research complies with IPY theme" Understanding Environmental change in Polar Regions" and includes participation in an international cruise. Detailed model descriptions and all of the results generated from these studies will be made public via a DynaLiFe website. Improving the CIAO model will give us and other IPY partners the opportunity to test the ecological consequences of physiological characteristics observed in Antarctic phytoplankton under current and future climate scenarios. Outreach will include participation in Stanford's Summer Program for Professional Development for Science Teachers, Stanford's School of Earth Sciences high school internship program, and development of curriculum for local science training centers, including the Chabot Space and Science Center.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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A-C. Alderkamp, H.J.W. de Baar, R.J.W. Visser, K.R. Arrigo. "Can Photoinhibition control phytoplankton abundance in deeply mixed water columns of the Southern Ocean?," Limnology and Oceanography, v.55, 2010, p. 1248.
| Funding Source | Award |
|---|---|
| NSF Antarctic Sciences (NSF ANT) |