Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast

S. N. Giddings, P. MacCready, B. M. Hickey, N. S. Banas, K. A. Davis, S. A. Siedlecki, V. L. Trainer, R. M. Kudela, N. A. Pelland, T. P. Connolly

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Harmful algal blooms (HABs) pose a significant threat to human and marine organism health, and negatively impact coastal economies around the world. An improved understanding of HAB formation and transport is required to improve forecasting skill. A realistic numerical simulation of the US Pacific Northwest region is used to investigate transport pathways from known HAB formation hot spots, specifically for Pseudo-nitzschia (Pn), to the coast. We show that transport pathways are seasonal, with transport to the Washington (WA) coast from a northern source (the Juan de Fuca Eddy) during the summer/fall upwelling season and from a southern source (Heceta Bank) during the winter/early spring due to the predominant wind-driven currents. Interannual variability in transport from the northern source is related to the degree of wind intermittency with more transport during years with more frequent relaxation/downwelling events. The Columbia River plume acts to mitigate transport to the coast as the plume front blocks onshore transport. The plume's influence on alongshore transport is variable although critical in aiding transport from the southern source to the WA coast via plume entrainment. Overall transport from our simulations captures most observed Pn HAB beach events from 2004 to 2007 (characterized by Pseudo-nitzschia cell abundance); however, numerous false positives occur. We show that incorporating phytoplankton biomass results from a coupled biogeochemical model reduces the number of false positives significantly and thus improves our Pn HAB predictions. Key Points Potential PNW HAB transport is seasonal, consistent with regional currents Transport is blocked by the Columbia River plume unless entrainment occurs A coupled hydrodynamic-biological model can predict PNW Pn HAB transport paths

LanguageEnglish
Pages2439-2461
Number of pages23
JournalJournal of Geophysical Research: Oceans
Volume119
Issue number4
DOIs
Publication statusPublished - 16 Apr 2014

Fingerprint

Pacific Northwest (US)
algae
coasts
algal blooms
Pseudonitzschia
Coastal zones
algal bloom
plumes
coast
Rivers
Columbia (Orbiter)
river plume
Columbia River
plume
entrainment
Phytoplankton
rivers
Beaches
Biomass
wind-driven current

Keywords

  • algal bloom
  • harmful algae
  • numerical simulations
  • Pacific Northwest
  • particle tracking
  • transport

Cite this

Giddings, S. N., MacCready, P., Hickey, B. M., Banas, N. S., Davis, K. A., Siedlecki, S. A., ... Connolly, T. P. (2014). Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast. Journal of Geophysical Research: Oceans, 119(4), 2439-2461. https://doi.org/10.1002/2013JC009622
Giddings, S. N. ; MacCready, P. ; Hickey, B. M. ; Banas, N. S. ; Davis, K. A. ; Siedlecki, S. A. ; Trainer, V. L. ; Kudela, R. M. ; Pelland, N. A. ; Connolly, T. P. / Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast. In: Journal of Geophysical Research: Oceans. 2014 ; Vol. 119, No. 4. pp. 2439-2461.
@article{6fadf7f9e2ac48c2bed852c609387259,
title = "Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast",
abstract = "Harmful algal blooms (HABs) pose a significant threat to human and marine organism health, and negatively impact coastal economies around the world. An improved understanding of HAB formation and transport is required to improve forecasting skill. A realistic numerical simulation of the US Pacific Northwest region is used to investigate transport pathways from known HAB formation hot spots, specifically for Pseudo-nitzschia (Pn), to the coast. We show that transport pathways are seasonal, with transport to the Washington (WA) coast from a northern source (the Juan de Fuca Eddy) during the summer/fall upwelling season and from a southern source (Heceta Bank) during the winter/early spring due to the predominant wind-driven currents. Interannual variability in transport from the northern source is related to the degree of wind intermittency with more transport during years with more frequent relaxation/downwelling events. The Columbia River plume acts to mitigate transport to the coast as the plume front blocks onshore transport. The plume's influence on alongshore transport is variable although critical in aiding transport from the southern source to the WA coast via plume entrainment. Overall transport from our simulations captures most observed Pn HAB beach events from 2004 to 2007 (characterized by Pseudo-nitzschia cell abundance); however, numerous false positives occur. We show that incorporating phytoplankton biomass results from a coupled biogeochemical model reduces the number of false positives significantly and thus improves our Pn HAB predictions. Key Points Potential PNW HAB transport is seasonal, consistent with regional currents Transport is blocked by the Columbia River plume unless entrainment occurs A coupled hydrodynamic-biological model can predict PNW Pn HAB transport paths",
keywords = "algal bloom, harmful algae, numerical simulations, Pacific Northwest, particle tracking, transport",
author = "Giddings, {S. N.} and P. MacCready and Hickey, {B. M.} and Banas, {N. S.} and Davis, {K. A.} and Siedlecki, {S. A.} and Trainer, {V. L.} and Kudela, {R. M.} and Pelland, {N. A.} and Connolly, {T. P.}",
year = "2014",
month = "4",
day = "16",
doi = "10.1002/2013JC009622",
language = "English",
volume = "119",
pages = "2439--2461",
journal = "Journal of Geophysical Research: Oceans",
issn = "0148-0227",
number = "4",

}

Giddings, SN, MacCready, P, Hickey, BM, Banas, NS, Davis, KA, Siedlecki, SA, Trainer, VL, Kudela, RM, Pelland, NA & Connolly, TP 2014, 'Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast' Journal of Geophysical Research: Oceans, vol. 119, no. 4, pp. 2439-2461. https://doi.org/10.1002/2013JC009622

Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast. / Giddings, S. N.; MacCready, P.; Hickey, B. M.; Banas, N. S.; Davis, K. A.; Siedlecki, S. A.; Trainer, V. L.; Kudela, R. M.; Pelland, N. A.; Connolly, T. P.

In: Journal of Geophysical Research: Oceans, Vol. 119, No. 4, 16.04.2014, p. 2439-2461.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hindcasts of potential harmful algal bloom transport pathways on the Pacific Northwest coast

AU - Giddings, S. N.

AU - MacCready, P.

AU - Hickey, B. M.

AU - Banas, N. S.

AU - Davis, K. A.

AU - Siedlecki, S. A.

AU - Trainer, V. L.

AU - Kudela, R. M.

AU - Pelland, N. A.

AU - Connolly, T. P.

PY - 2014/4/16

Y1 - 2014/4/16

N2 - Harmful algal blooms (HABs) pose a significant threat to human and marine organism health, and negatively impact coastal economies around the world. An improved understanding of HAB formation and transport is required to improve forecasting skill. A realistic numerical simulation of the US Pacific Northwest region is used to investigate transport pathways from known HAB formation hot spots, specifically for Pseudo-nitzschia (Pn), to the coast. We show that transport pathways are seasonal, with transport to the Washington (WA) coast from a northern source (the Juan de Fuca Eddy) during the summer/fall upwelling season and from a southern source (Heceta Bank) during the winter/early spring due to the predominant wind-driven currents. Interannual variability in transport from the northern source is related to the degree of wind intermittency with more transport during years with more frequent relaxation/downwelling events. The Columbia River plume acts to mitigate transport to the coast as the plume front blocks onshore transport. The plume's influence on alongshore transport is variable although critical in aiding transport from the southern source to the WA coast via plume entrainment. Overall transport from our simulations captures most observed Pn HAB beach events from 2004 to 2007 (characterized by Pseudo-nitzschia cell abundance); however, numerous false positives occur. We show that incorporating phytoplankton biomass results from a coupled biogeochemical model reduces the number of false positives significantly and thus improves our Pn HAB predictions. Key Points Potential PNW HAB transport is seasonal, consistent with regional currents Transport is blocked by the Columbia River plume unless entrainment occurs A coupled hydrodynamic-biological model can predict PNW Pn HAB transport paths

AB - Harmful algal blooms (HABs) pose a significant threat to human and marine organism health, and negatively impact coastal economies around the world. An improved understanding of HAB formation and transport is required to improve forecasting skill. A realistic numerical simulation of the US Pacific Northwest region is used to investigate transport pathways from known HAB formation hot spots, specifically for Pseudo-nitzschia (Pn), to the coast. We show that transport pathways are seasonal, with transport to the Washington (WA) coast from a northern source (the Juan de Fuca Eddy) during the summer/fall upwelling season and from a southern source (Heceta Bank) during the winter/early spring due to the predominant wind-driven currents. Interannual variability in transport from the northern source is related to the degree of wind intermittency with more transport during years with more frequent relaxation/downwelling events. The Columbia River plume acts to mitigate transport to the coast as the plume front blocks onshore transport. The plume's influence on alongshore transport is variable although critical in aiding transport from the southern source to the WA coast via plume entrainment. Overall transport from our simulations captures most observed Pn HAB beach events from 2004 to 2007 (characterized by Pseudo-nitzschia cell abundance); however, numerous false positives occur. We show that incorporating phytoplankton biomass results from a coupled biogeochemical model reduces the number of false positives significantly and thus improves our Pn HAB predictions. Key Points Potential PNW HAB transport is seasonal, consistent with regional currents Transport is blocked by the Columbia River plume unless entrainment occurs A coupled hydrodynamic-biological model can predict PNW Pn HAB transport paths

KW - algal bloom

KW - harmful algae

KW - numerical simulations

KW - Pacific Northwest

KW - particle tracking

KW - transport

UR - http://www.scopus.com/inward/record.url?scp=84900548744&partnerID=8YFLogxK

U2 - 10.1002/2013JC009622

DO - 10.1002/2013JC009622

M3 - Article

VL - 119

SP - 2439

EP - 2461

JO - Journal of Geophysical Research: Oceans

T2 - Journal of Geophysical Research: Oceans

JF - Journal of Geophysical Research: Oceans

SN - 0148-0227

IS - 4

ER -