Productivity in the Benguela Current Large Marine Ecosystem

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 Dev. Co. Cast broadcast ocean color and SST with fluorometrically determine in-situ chlorophyll-a and temperature data in 2009”) Deon Louw (Nat. MIRC) and Valborg Byfield (NOCS) Monthly chlorophyll-a concentrations at the 10 nm station on the 23º 00 S 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 In-situ Remote sensing Pre conditions Pre-screen of Data Chlorophyll-a Temperature Chlorophyll-a Kd 490 Data cleanup Temperature C C h l h l - l a a a Algorithm to mask suspect pixels Meta-data Time match-up Excel sheet Scatter plot Match up Temperature Chl Kd 490 Step 1: Import mage Step 2 : Stations Step 3 : Extract Data Step 4: Statistical analysis

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

Step 2 Define your sampling point/s by creating a Point Map (A) Create a Domain Map_Raw Map_1 (B) Create a Table (C) Create a Point Map_Border Map_2 Map_Station s Map_3

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

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