A Nutrient Climatology for the Gulf of Maine − Georges Bank Region June 23, 2008 David Townsend Nathan Rebuck Maura Thomas.

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Presentation transcript:

A Nutrient Climatology for the Gulf of Maine − Georges Bank Region June 23, 2008 David Townsend Nathan Rebuck Maura Thomas

N>73,889 Year

GoM Nutrient Database (as of 1 Apr 2008): Rebuck/Townsend, University of Maine Data Sources WOD- ( ; incl. Dec 2007 update ) DWT– ( ) DWT-GLOBEC– ( ) DWT-GOMTOX – (2007) WHOI- ( ) provided by D. McGillicuddy PETRIE- ( ) provided by B. Petrie (BIO). Marine Environmental Science Division (MESD) at BIO as well as the Marine Environ Data Serv. (MEDS) in Ottawa. AZMP-( ) Atlantic Zone Monitoring Program AZMP Integrated Science Data Management (ISDM), as part of the Dep. Fisheries and Oceans Canada (DFO) UNH-COOA-( )

Rebuck/Townsend GoM Regional Nutrient Data Sources Year SampledNumber of Samples WOD( )49,551 PETRIE( )29,064 DWT (Misc)( )12,639 DWT (GLOBEC)( )3,925 DWT (GOMTOX)(2007) Two cruises!3,249 WHOI( )6,478 AZMP (DFO Canada)( )1,893 Univ. NH (COOA)( )1,481 TOTAL( )108,232 ~73,000 within gridded domain

Year (binned annually) # of samples Year (binned annually) # of samples Total Samples Samples Analyzed only since 1960

month Number of samples Seasonal Distribution of Sample Collections:

Grid Size = 2x2 minutes

Gridded monthly products – Surface Nitrate JanFebMarApr May Jun JulAug Sep Oct Nov Dec

Annual Cycle: Surface NO 3

Surface Silicate N=48,346; much lower confidence in offshore winter months

Potential Primary Production (NO 3 -based): e.g., Prod αV/Vmax = NO 3 /(NO 3 + Ksp)… Ksp=1.5uM

200m NO 3 (with 150m mask) Note cool colors inshore are generally shallower than 200m (i.e. junk data from gridding), but larger coherent trends in basins are data-driven

200m Si(OH) 4 (with 150m mask) Note cool colors inshore are generally shallower than 200m (i.e. junk data from gridding), but larger coherent trends in basins are data-driven

~2 minute grid, smoothed version of the USGS 15 second bathymetric grid (from K. Smith, WHOI) Objective analysis for 12 months (calculated for the 15 th of each month) nine z-layers (1m-10m-20m-30m-40m-50m-100m-150m-200m) calculated as z ±5 (0-5, 5-15, 15-25, 25-35, 35-45, 45-55, , , ) Computed based on relative weightings of x, y, z, date, Temperature, Salinity, and log(bathymetry) to retain some separation across frontal zones and along the shallower contours Gaussian weighting function for all parameters; standard deviations for each x,y=50km, z=10m, date=30 days Temperature=2.5°C, Salinity=.5 psu, Log bathymetry=.5, Methods

From the monthly calculations (centered on the 15 th of each month), linear interpolation between months to generate the smooth animation -after March 15, influence of April 15 th begins rapid drawdown that proceeds through May Features to watch: - coastal region, both Nova Scotia, Eastern Maine, and Western Gulf - Browns Bank “feeding” the NS side of the Coastal Current - GSC and NE Peak of Georges with higher values in early summer - highest values in western gulf in late winter/early spring - low values south of Cape Cod into Mid-Atlantic region Notes: