Figure 2 (a). Time series of mixed layer depth from the Papa model, daily values (solid line), and subsampled on intervals of 15 days (dashed line) and 30 days (heavy line). (b) Ecosystem model chlorophyll concentration using the model mixed layer depths from the curves in (a). As mixed layer depth fluctuations are eliminated by sub-sampling the physical model output, the short-term fluctuations of chlorophyll in the ecosystem model diminish.