A simple short range model for the prediction of harmful algal events in the bays of southwestern Ireland

Abstract A simple model is described which predicts harmful algal events in the bays of southwestern Ireland. Fundamental to the model is the physical forcing of circulation in these bays in summer. The predominant hydrographic feature at this time is a wind-driven two-layer oscillatory flow acting in a thermally stratified water column. This mechanism exchanges substantial proportions of the bays' volumes, and harmful algal events arise with the associated transport of harmful populations into them. The model is therefore based on the criterion that wind-driven water exchanges result in exchanges of phytoplankton, which, if the time of year is correct, result in toxic events. Utilising Bantry Bay as an example, hindcasting showed that the model has a high degree of success using a wind index based on the sequence of winds that results in water exchange. The model was implemented by estimating indices from the five-day weather forecast, and trialled in 2005. Results were published on the web in real time, during which a predicted water exchange event in mid-June was accompanied by an influx of Dinophysis acuminata into Bantry Bay with an associated contamination of shellfish with Diarrheic Shellfish Poisoning toxins.

[1]  L. Fernand,et al.  Observations of the physical structure and seasonal jet-like circulation of the Celtic Sea and St. George's Channel of the Irish Sea , 2003 .

[2]  Michael Steele,et al.  What drove the dramatic retreat of arctic sea ice during summer 2007? , 2008 .

[3]  L. Fernand,et al.  Paralytic Shellfish Poisoning on the East Coast of the UK in Relation to Seasonal Density-driven Circulation , 2001 .

[4]  R. Raine,et al.  Physical dynamics on the continental shelf off southwestern Ireland and their influence on coastal phytoplankton blooms , 1998 .

[5]  S. O’Boyle,et al.  THE INFLUENCE OF LOCAL AND REGIONAL OCEANOGRAPHIC PROCESSES ON PHYTOPLANKTON DISTRIBUTION IN CONTINENTAL SHELF WATERS OFF NORTH-WESTERN IRELAND , 2007, Biology and Environment: Proceedings of the Royal Irish Academy.

[6]  W. Yih,et al.  First successful culture of the marine dinoflagellate Dinophysis acuminata , 2006 .

[7]  Kevin Horsburgh,et al.  Thermohaline circulation of shallow tidal seas , 2008 .

[8]  B. Reguera,et al.  Molluscan Shellfish Safety , 2003 .

[9]  R. Raine,et al.  Hydrography and phytoplankton of waters off south-west Ireland , 1990 .

[10]  R. Raine,et al.  The Irish coastal current: a seasonal jet-like circulation , 2006 .

[11]  Ken Jones,et al.  Transient Coastal Upwelling and Water Circulation in Bantry Bay, a Ria on the South-west Coast of Ireland , 1996 .

[12]  John J. Cullen,et al.  Monitoring and Management Strategies for Harmful Algal Blooms in Coastal Waters , 2001 .

[13]  M. Johansen,et al.  The use of fuzzy logic for data analysis and modelling of European harmful algal blooms: results of the HABES project , 2006 .

[14]  Leo M.L. Nollet,et al.  Handbook of Food Analysis : Volume 2: Residues and Other Food Component Analysis , 2004 .

[15]  Jason Feldman,et al.  Application of environmental sample processor (ESP) methodology for quantifying Pseudo‐nitzschia australis using ribosomal RNA‐targeted probes in sandwich and fluorescent in situ hybridization formats , 2006 .

[16]  Bloom development and transport of toxic Alexandrium fundyense populations within a coastal plume in the Gulf of Maine , 2005 .

[17]  J. Silke,et al.  Review of phytoplankton monitoring 2006 , 2006 .

[18]  R. Margalef.  Life-forms of phytoplankton as survival alternatives in an unstable environment , 1978 .

[19]  K. Jones,et al.  The development of a bloom of the dinoflagellate [Gyrodinium aureolum (Hulbert)] on the south-west Irish coast , 1993 .

[20]  R. Gowen,et al.  Influence of stratification and irradiance regime on summer phytoplankton composition in coastal and shelf seas of the British Isles , 1990 .

[21]  Oliver N. Ross,et al.  GEOHAB Core Research Project: HABs in Stratified Systems. "Advances and Challenges for Understanding Physical-Biological Interactions in HABs in Stratified Environments" , 2013 .