Numerical model simulating the sea ice and ocean conditions in the Amundsen Sea over the period Jan. 1, 2006 to Dec. 31, 2013 (INSPIRE project)

Website: https://www.bco-dmo.org/dataset/729546
Data Type: model results
Version: 2017-08-30

Project
» Collaborative Research: Investigating the Role of Mesoscale Processes and Ice Dynamics in Carbon and Iron Fluxes in a Changing Amundsen Sea (INSPIRE) (INSPIRE)
ContributorsAffiliationRole
St-Laurent, PierreOld Dominion University (ODU)Principal Investigator, Contact
Hofmann, Eileen E.Old Dominion University (ODU)Co-Principal Investigator
Sherrell, Robert M.Rutgers UniversityCo-Principal Investigator
Stammerjohn, Sharon EUniversity of Colorado (UCo - INSTAAR)Co-Principal Investigator
Yager, Patricia L.University of Georgia (UGA)Co-Principal Investigator
Biddle, MathewWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Table of Contents


Coverage

Spatial Extent: N:-71 E:-100 S:-75 W:-130
Temporal Extent: 2006-01-01 - 2013-12-31

Dataset Description

The data are from a numerical model simulating the sea ice and ocean conditions in the Amundsen Sea over the period Jan. 1, 2006 to Dec. 31, 2013. The data files provide the daily averaged model fields during this period. The numerical model and experiment are thoroughly described in St-Laurent et al., J. Geophys. Res. Oceans, doi:10.1002/2017jc013162.

Abstract (verbatim from published text):

Numerous coastal polynyas fringe the Antarctic continent and strongly influence the productivity of Antarctic shelf systems. Of the 46 Antarctic coastal polynyas documented in a recent study, the Amundsen Sea Polynya (ASP) stands out as having the highest net primary production per unit area. Incubation experiments suggest that this productivity is partly controlled by the availability of dissolved iron (dFe). As a first step toward understanding the iron supply of the ASP, we introduce four plausible sources of dFe and simulate their steady spatial distribution using conservative numerical tracers. The modeled distributions replicate important features from observations including dFe maxima at the bottom of deep troughs and enhanced concentrations near the ice shelf fronts. A perturbation experiment with an idealized drawdown mimicking summertime biological uptake and subsequent resupply suggests that glacial meltwater and sediment-derived dFe are the main contributors to the prebloom dFe inventory in the top 100 m of the ASP. The sediment-derived dFe depends strongly on the buoyancy-driven overturning circulation associated with the melting ice shelves (the “meltwater pump”) to add dFe to the upper 300 m of the water column. The results support the view that ice shelf melting plays an important direct and indirect role in the dFe supply and delivery to polynyas such as the ASP.

Note:

If you would like to access the data files associated with this dataset, please contact info@bco-dmo.org. Include the url to this page in your correspondence. 


Acquisition Description

The numerical model used in the publication is the Regional Ocean Modeling System (ROMS). This open source model and its documentation are freely available at myroms.org. The model geometry, initial and boundary conditions are provided as part of this dataset. 


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Parameters

ParameterDescriptionUnits
dye_01Tracer for glacial meltwater (data file name = passive_tracers_00xx.nc) ppt
dye_02Tra. for gl.meltw. with nudging in cavities (data file name = passive_tracers_00xx.nc) ppt
dye_04Tracer for sediments (data file name = passive_tracers_00xx.nc) ppt
dye_05Tra. for sed. with nudging in cavities (data file name = passive_tracers_00xx.nc) ppt
dye_07Tracer for Circumpolar Deep Water (CDW) (data file name = passive_tracers_00xx.nc) ppt
dye_08Tr. for CDW with nudging in cavities (data file name = passive_tracers_00xx.nc) ppt
zetaSea surface height (data file name = physics_00xx.nc) m
wWater vertical velocity (data file name = physics_00xx.nc) m/s
tempClimatological temperature for relax. at OB (data file name = ocean_clm.nc) C
saltClimatological salinity for relaxation at OB (data file name = ocean_clm.nc) PSU
HuonMean zonal water transport Dec. 2010 (data file name = cell_transport_dec2010.mat) m3/s
HvomMean merid. water transport Dec. 2010 (data file name = cell_transport_dec2010.mat) m3/s
AKtVertical eddy diffusivity (data file name = physics_00xx.nc) m2/s
shfluxNet surface heat flux (data file name = physics_00xx.nc) W/m2
ssfluxNet surface evapo-precip. flux (data file name = physics_00xx.nc) m/s
latentNet latent heat flux (data file name = physics_00xx.nc) W/m2
sensibleNet sensible heat flux (data file name = physics_00xx.nc) W/m2
lwradNet longwave radiation flux (data file name = physics_00xx.nc) W/m2
swradSolar shortwave radiation flux (data file name = physics_00xx.nc) W/m2
uiceZonal ice velocity (data file name = physics_00xx.nc) m/s
viceMeridional ice velocity (data file name = physics_00xx.nc) m/s
aiceMonthly sea ice concentration (data file name = sea_ice_conc_july2010_june2011.mat) unitless
hiceSea ice thickness (data file name = physics_00xx.nc) m
snow_thickSnow thickness on ice (data file name = physics_00xx.nc) m
iomflxIce-ocean mass flux (data file name = physics_00xx.nc) m/s
bmelMean basal melt 2007-2008 (data file name = basal_melt_2007_2008.mat) kg m-2 yr-1
thetMean temperature Dec. 2010 (data file name = salinity_temperature_dec2010.mat) C
gmwcSteady tracer for glacial meltwater (data file name = glacial_meltwater_dec2010.mat) ppt
cdwcSteady tracer for CDW with nudging (data file name = tracer_cdw_dec2010_with_nud.mat) ppt
sedcSteady tracer for sed. with nudging (data file name = tracer_sed_dec2010_with_nud.mat) ppt
meltMean meltwater flux Jan.2006-2013 (data file name = melt_flux_sea_ice_ocean_interface.mat) m
tserMonthly meltwater flux over polynya (data file name = melt_flux_sea_ice_ocean_polynya.mat) m
cdwiDaily iron from CDW in upper 100m polynya (data file name = dissolved_iron_inventory_polynya.mat) nM
gmwiDaily iron from glacial ice upper 100m polynya (data file name = dissolved_iron_inventory_polynya.mat) nM
sediDaily iron from sediments upper 100m polynya (data file name = dissolved_iron_inventory_polynya.mat) nM
hModel bathymetry (data file name = ocean_grd.nc) m
ziceIce shelf draft (data file name = ocean_grd.nc) m
lon_rhoLongitude of model grid points (data file name = ocean_grd.nc) Degrees
lat_rhoLatitude of model grid points (data file name = ocean_grd.nc) Degrees
UwindDaily zonal winds at 10m height (data file name = ocean_frc.nc) m/s
VwindDaily meridional winds at 10m height (data file name = ocean_frc.nc) m/s
salt_*Open Boundary (OB) condition for salinity [the * can be replaced with north;south;east;or west] (data file name = ocean_bry.nc) PSU
temp_*Open Boundary (OB) condition for temperature [the * can be replaced with north;south;east;or west] (data file name = ocean_bry.nc) C
cdiwIce-water bulk drag coefficient (data file name = ice.in) unitless
cdaiAir-ice bulk drag coefficient (data file name = ice.in) unitless
TNU2Harmonic horizontal diffusion of tracers (data file name = ocean_amundsen_sea.in) m2/s

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Project Information

Collaborative Research: Investigating the Role of Mesoscale Processes and Ice Dynamics in Carbon and Iron Fluxes in a Changing Amundsen Sea (INSPIRE) (INSPIRE)

Coverage: The study area is the continental shelf of the Amundsen Sea, Antarctica, 71-75S, 100-130W.

The Amundsen Sea, in the remote Pacific sector of the Southern Ocean, is one of the least well studied Antarctic continental shelf regions. It shares characteristics in common with other Antarctic ice shelf regions, but exhibits unique aspects also. The Amundsen Sea Polynya (ASP), an open region at the base of several of the terminal glaciers draining the West Antarctic Ice sheet exhibits: 1) large intrusions of heat delivered from the warming modified circumpolar deep water (mCDW) rising up onto the continental shelf, 2) the fastest melting ice sheets in Antarctica, 3) the most productive coastal polynya (161 g C m-2) together with a significant atmospheric CO2 sink, and 4) some of the most rapidly declining regions of seasonal off-shore sea ice on Earth. Following on from an earlier oceanographic field program, the Amundsen Sea Polynya International Research Expedition (ASPIRE; 2011), this study seeks to better synthesize and model the relative contributions of both physical ocean-ice linkages and biological production and carbon export terms and to compare these with other circumpolar Antarctic regions. A central feature will be the use of a regionally coupled physical-biogeochemical model to follow the dynamics of the large phytoplankton blooms that occur annually in the Amundsen Sea Polyna. This study will provides a means to locate the Amundsen Sea properties along the continuum of Antarctic ice shelf systems, and to understand how these system might change in response to climate change. Pedagogical techniques will be used to provide educational outreach for three distinct target populations: secondary students, pre-service science teachers, and in-service science teachers. Partnerships will be developed with science teacher educators to implement the STEM career-development lessons in undergraduate and graduate level science teacher education courses.

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Funding

Funding SourceAward
NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP) OPP-1443657
NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP) OPP-1443604
NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP) OPP-1443315
NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP) OPP-1443569

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