A 12 year time series of Chl-a were analysed for the northern BUS.
It was linked with temp, nitrate, silicate, Chl-a and wind.
Inshore and offshore variability of Chl-a in northern BUS with no significant trends.
Temperature, nitrate, silicate, wind and Chl-a had shown seasonality.
Three Chl-a peaks in April, August and December have different forcing mechanisms.