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Final Technical Report: - Southwest Fisheries Science Center - NOAA

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Figure 11. Surface chlorophyll (mg m -3 ) observed in 2005 interpolated using five methods; the ±sd of residuals are<br />

shown for both jackknife procedures (single, daily). The map on the lower right is mean of monthly SeaWiFS<br />

composites (http://oceancolor.gsfc.nasa.gov).<br />

1) Kriging weights do not go to zero at the edge of the search ellipse; consequently, in sparse<br />

data areas the interpolated field will suddenly change due to the loss of the influence of a sample<br />

near the search limits. Interpolated fields show oval-shaped step changes in these areas.<br />

2) Interpolated fields also show fine-scale variations, such as jagged wiggles in the contours.<br />

Presumably these are a result of the kriging process, rather than true patterns in the observed<br />

data, but we have not investigated the cause.<br />

43

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