Derived data averaged over broad regions and years.

Derived_Annual_Broadscale

Format

A dataframe

area

Area name where data was collected

year

The year in which data was collected

sea_temperature_at_sea_floor_july

Temperature at sea floor during the month of July, averaged over NAFO areas 4X, 4W and 4V.

sea_surface_temperature

Temperature at sea surface averaged over NAFO regions 4V, 4X and 4W as well as regional areas (Bay of Fundy + Gulf of Maine)

north_atlantic_oscillation

North Atlantic Oscillation Index (NAO), calculated using sea level pressure difference between subtropical high and subpolar low

atlantic_multidecadal_oscillation

Atlantic Multidecadal Oscillation Index (AMO), based on anomalies of sea surface temperatures in North Atlantic basin.

cold_intermediate_layer_volume

A measure of the volume of the cold intermediate layer throughout the Gulf of St. Lawrence

sea_ice_volume

Average ice volume for January - March in the Gulf of St. Lawrence, can be reasonably used as a proxy to represent sea ice volume on the Scotian Shelf.

density_gradient_0_50

An index of stratification, measured as the density difference between 0 and 50 metres

temperature_at_sea_floor

Averaged water temperatures at sea floor, over NAFO areas 4X, 4V and 4W

minimum_temperature_in_cold_intermediate_layer

Minimum temperature in the cold intermediate layer within the Gulf of St. Lawrence

salinity

Discrete salinity measurements over a range of depths

sea_temperature

Discrete sea temperature measurements over a range of depths

sea_surface_temperature_from_satellite

Averages of sea surface temperatures infered from remote sensing (satellite) measurements

sea_surface_temperature_warming

Derived metric calculating the warming of sea surface temperature averages over the Scotian Shelf

final_day_of_sea_ice

The final day of sea ice observed in the Gulf of St. Lawrence. Note that this metric can be used as a reasonable proxy for the Scotian Shelf

sea_ice_area

Average of sea ice area, seaward of Cabot Strait

surface_chlorphyll

Average surface chlorophyll as inferred from satellite (remote sensing) measurements

Details

The data can be cited as follows: Casault, B., Johnson, C., Devred, E., Head, E., Cogswell, A., and Spry, J. 2020. Optical, Chemical, and Biological Oceanographic Conditions on the Scotian Shelf and in the Eastern Gulf of Maine during 2018. DFO Can. Sci. Advis. Sec. Res. Doc. 2020/037. v + 66 p.

Hebert, D., Pettipas, R., and Brickman, D. 2020. Physical Oceanographic Conditions on the Scotian Shelf and in the Gulf of Maine during 2018. DFO Can. Sci. Advis. Sec. Res. Doc. 2020/036 iv + 52 p.

Note

time_scale

Annual

regional_scale

Broadscale

category

biological, biochemical, physical