Polynya Analyses Eastern Side Antarctic Peninsula

I created six masks on which I calculated average chlorophyll, open water area, average production (per m2) and production integrated over the open water area.

The masks are illustrated in jpeg file Basemap_boxes.jpg.
There are 2 large masks and 4 closeups.
Mask 1 = total area of interest, ie. box bounded by 56W-62W, 63.25:66.5S, eastern side of the Peninsula only (yellow + green boxes)
Mask 2 = nearshore area only (green box)
Mask 3 = Area where stations 1-6 of NBP0107 cruise are located (purple box)
Mask 4 = Blue box (stations 36-38 NBP0003 and stations 40,49, 50 NBP0107)
Mask 5 = Dark blue box (stations 1,27-35 NBP0003)
Mask 6 = Light blue box (stations 3-22, NBP0003)

The results are in the following files:

Column format similar for all files.  First couple of columns have the dates (or date ranges), last 6 columns are the results for the individual masks.

Mean chlorophyll: polynya_amy_'year'_chl_mean_det.txt (number of pixels in file: polynya_amy_'year'_chl_npix_det.txt).  These are based on the 8-day Level 3 SeaWiFS product, which has been filtered for unlikely high chlorophyll values (ie. if [chl] greater then 30 ug/L then it was set to 30 ug/L).

Open water area: polynya_amy_'year'_ice_det.txt: daily open water areas. Calculated using the PSSM Algorithm (see Polynya paper).  The PSSM algorithm sometimes finds open water over land.  Therefore, usually a general landmask is applied.  Because of the high detail of this study and disappearing iceshelves in the region the SSM/I landmask was not appropriate.  A modified landmask was used where any historic SeaWiFS chlorophyll pixel would indicate no land.

Production: polynya_amy_'year'_prod_mean_det.txt.  Modeled production, in gC.m-2.day-1.  See Polynya paper for more details).

Areal production: polynya_amy_'year'_ice_prod_det.txt.  The open water area was multiplied by the average production to get total areal production.  [Area (km2) * Prod (gC.m-2.day-1)]


-Gert