Figure 2
From: Interannual monsoon wind variability as a key driver of East African small pelagic fisheries
Satellite Chl-a seasonal and interannual variations over the Tanzanian coastal waters from 1997 to 2015. (a) Chl-a climatological annual mean in mg/m3. Data on the Rufiji river outflow area are masked in white. The 200 m isobath derived from ETOPO2v1 global gridded database is represented by solid black line. The thin blue lines on the grey land mask indicate the rivers positions. The major river (Rufiji) is highlighted with a thick blue line. The map on panel (a) was created by the authors using MATLAB software vR2015b (see https://uk.mathworks.com/products/new_products/release2015b.html and https://uk.mathworks.com/products/matlab.html). (b) The corresponding annual cycles averaged over the boxed region for the climatology, 2002, 2004 and 2011 are in green, black, grey and purple respectively. The light green shading represents ± 2 standard deviation from the climatology. (c) Monthly timeseries of Chl-a concentrations from September 1997 to December 2015 (in green). The Chl-a maxima of Southeast monsoons and Northeast monsoon (i.e. the maximum Chl-a attained during the season) are superimposed in red and blue respectively. The values falling on upper side of the 0.328 mg/m3 Chl-a level, which is the mean of the Chl-a maxima timeseries (dashed horizontal line), indicate high Chl-a years and are highlighted in black dots and those falling on the lower sider, represent low Chl-a years and are in a purple dots. (d) Chl-a meridional variations over the coastal area inside the black box (a) are presented by a time–space diagram.
