Both physical and biological processes can export phytoplankton to depths below the euphotic zone. The role of physical transport in exporting chlorophyll biomass to depth was evaluated in the Santa Barbara Channel using data from 16 seasonal cruises during the Santa Barbara Coastal Long Term Ecological Research project (SBC-LTER). Measurements included surveys of CTD casts, towed transects using instrumented, undulating vehicles (ScanFish and TRIAXUS), surface currents from an array of high-frequency radars, and an underway acquisition system for near-surface water properties, meteorological variables, and currents from ship-board acoustic Doppler current profilers. Data from highly-resolved towed transects were calibrated using the complementary CTD data; in particular, calibrations were obtained for chlorophyll fluorometers on the towed profilers. Data from the towed profilers were interpolated onto a regular grid using ordinary Kriging. By combining Kriged data sets with euphotic zone depths from the CTD grids, the fraction of total chlorophyll biomass below the euphotic zone was estimated for the channel-wide surveys and compared among cruises, with a minimum of 8%, a maximum of 41%, and a mean of 24% (+/-11%) of chlorophyll found at depth for an entire cruise. Along-isopycnal mixing and advection [Washburn et al, 1991] and submesoscale eddy processes [Dong et al., 2012] appear to be important for transporting significant amounts of chlorophyll biomass to depth.