ENSO and the California Current coastal upwelling response

A 31 year (1980-2010) sequence of historical analyses of the California Current System (CCS) is used to describe the central CCS (35-43N) coastal upwelling response to El Nino-Southern Oscillation (ENSO) variability. The analysis period captures 10 El Nino and 10 La Nina events, including the extreme El Ninos of 1982-1983 and 1997-1998. Data-assimilative model runs and backward trajectory calculations of passive tracers are used to elucidate physical conditions and source water characteristics during the upwelling season of each year. In general, El Nino events produce anomalously weak upwelling and source waters that are unusually shallow, warm, and fresh, while La Nina conditions produce the opposite. Maximum vertical transport anomalies in the CCS occur approximate to 1 month after El Nino peaks in midwinter, and before the onset of the upwelling season. Source density anomalies peak later than transport anomalies and persist more strongly through the spring and summer, causing the former to impact the upwelling season more directly. As nitrate concentration covaries with density in the central CCS, El Nino may exert more influence over the nitrate concentration of upwelled waters than it does over vertical transport, although both factors are expected to reduce nitrate supply during El Nino events. Interannual comparison of individual diagnostics highlights their relative impacts during different ENSO events, as well as years deviating from the canonical response to ENSO variability. The net impact of ENSO on upwelling is explored through an Upwelling Efficacy Index, which may be a useful indicator of bottom-up control on primary productivity.