Productivity in the Benguela Current Large Marine Ecosystem using ocean colour and SST data (“Analyzing and comparing of a high and low productivity period (summer and a winter) in the Benguela using DevCoCast broadcast ocean color and SST with fluorometrically determine in-situ chlorophyll-a and temperature data in 2009”) Deon Louw (NatMIRC) and Valborg Byfield (NOCS) Monthly chlorophyll-a concentrations at the 10nm station on the 23º00S line off Wallvis Bay measured in µg/L.

Objectives Compare the in-situ data with RS data Creating a weekly composite Time series analysis ILWIS

Flow Chart Remote sensing Kd490Temperature Chlorophyll-a Pre-screen of Data Chl-aChl-a Chl-aChl-a Chl-aChl-a Time match- up Chlorophyll-aTemperature In-situ Pre conditions Meta-data Step 1: Import mage Step 2 :Stations Step 3 : Extract Data Step 4: Statistical analysis Excel sheet Algorithm to mask suspect pixels Data cleanup Scatter plot Match up Temperature Chl Kd490

(A) Comparison of the RS data with the in-situ data (1km) Step 1 Import image using the GEONETCast ToolBox

Step 2 Define your sampling point/s by creating a Point Map Map_1Map_2Map_3 Map_Raw Map_Border Map_Station s (A) Create a Domain (B) Create a Table (C) Create a Point Map

Step 3 Extract data (A) Reading of actual values from the image (C) By creating a Table using Map List (B) By creating a Table with the remote sensing data of interest in it

Step 4 Comparative analysis of the match-ups Remote Sensing Data In-situ Data Scatter plots

Results

Using Bilko to quality check and clean up chlorophyll data

Thank you