Environmental window of cyanobacteria bloom occurrence

Summer cyanobacteria blooms regularly occur in the Baltic Sea. The phenology of bloom, however, is mostly unknown. Data total biomass bloom-forming species Nodularia spumigena, Aphanizomenon sp. and Dolichospermum spp., water column variables, nutrients weather conditions were used to study define optimum environmental window for occurrence Gotland Basin during period 1990–2017. intra-annual variability was modeled using a Weibull function partial least squares regression variables that explain timing onset, peak decline stages bloom. On average lasted 41±16 days, starting mid-June, reaching maximum observed by mid-July ending end July with three 79, 353 161 µg L−1, respectively. onset bloom driven sea surface temperature (14 °C), air outgoing long-wave radiation (−68 W m−2), mixed layer depth (26 m), stability expressed as Brunt–Väisälä frequency (−0.02 s−2), phosphate concentration (0.1 mmol m−3) wind speed (5 m s−1). time controlled sensible (41 m−2) latent (−3 heat flux. incoming solar (218 net flux (178 (35 (−12 m−3). If occurs early or lasts longer depends on overall effect these explanatory have each stage results show part exchange takes place between overlying atmosphere, components are rarely included bloom-related studies. also can be an approach favor it.