Daoxun Sun 2015.04.21. Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary.

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Presentation transcript:

Daoxun Sun

Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary

Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary

Primary production and the depth of mixed layer If MLD < critical depth, the vertically integrated photosynthesis exceeds respiration in the mixed layer. Plankton is vertically transported through the depth of the mixed layer (Notes from phys and chem of oceans) Two possible factors: Stratification –>surface density Light ->shortwave radiation

Northern bloom Central bloom

Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary

Data source Chlorophyll: Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) Temperature, salinity, density: Simple Ocean Data Assimilation (SODA) Shortwave radiation: National Centers for Environmental Prediction (NCEP) Reanalysis Period: 1998 to 2010

Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary

Discontinuity of data The months with data covers less than 40% (~70% maximum coverage) of grid points were neglected Cubic spline interpolation was applied for other months Be care about the lag correlation

Effective sample size The data is more likely to be Red noise (Bretherton et al, 1999)

Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary

EOF analysis

EOF of anomaly

Lag correlation with shortwave radiation

Lag correlation with surface density

Lag correlation with surface salinity

Lag correlation with surface temperature

Outline Background Data Technical details Result EOF of chlorophyll data Correlation with possible factors Summary

The inter annual variability of the phytoplankton bloom at northern Labrador Sea can be captured by the 1 st EOF of the chlorophyll data The inter annual variability of chlorophyll data is likely connected with the surface density anomaly The negative density anomalies possibly come from the fresh and cold signal along the West Greenland Current. It is likely connected with the ice melting from Greenland.