Fig. 2. Sampling coverage at 22 existing oceanic time series stations that have run for 10 years or longer. For each site, the years in operation based on data reports are given above a grid representing the properties monitored at three depth ranges: surface (S, to 500 meters), midwater (M, 500–2000 meters), and benthos (B, below 2000 meters or up to 500 meters above seafloor for shallower sites).