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Connections between upwelling patterns and phytoplankton variability under different coastal regimes in SW Iberia Peninsula

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dc.contributor.authorKrug, Lilian
dc.contributor.authorSilvano, Kathleen M.
dc.contributor.authorBarbosa, Ana B.
dc.contributor.authorDomingues, Rita B.
dc.contributor.authorGalvão, Helena M.
dc.contributor.authorLuis, Joaquim
dc.contributor.authorPlatt, Trevor
dc.contributor.authorRelvas, Paulo
dc.contributor.authorSathyendranath, Shubha
dc.date.accessioned2012-11-29T14:57:09Z
dc.date.available2012-11-29T14:57:09Z
dc.date.issued2012
dc.description.abstractThe region off southwestern Iberia (NE Atlantic) encompasses a wide variety of oceanographic regimes, including differently (geographic) oriented coastal areas impacted by upwelling, riverine inputs and submarine groundwater discharge, submarine canyons and seamounts, and open ocean waters, thereby potentially promoting zone-specific phytoplankton dynamics. Overall, this heterogeneous region is classified as being very sensitive to climate change, and climate-driven alterations (e.g., sea surface warming, changes in upwelling patterns and intensity) have been recently reported for the area. The present study aims to understand the contribution of upwelling to seasonal and interannual variability of coastal phytoplankton, using a remote sensing-based approach. Phytoplankton variability was evaluated using satellite-derived chlorophyll-a (Chl-a), as a proxy for phytoplankton biomass, and primary productivity (PP). Chl-a were obtained from merged SeaWiFS (Seaviewing Wide Field-of-view Sensor), MeRIS (Medium Resolution Imaging Spectrometer) and MODIS-Aqua (Moderate-resolution Imaging Spectroradiometer) sensors at Globcolour portal. PP data at 9.25 km resolution were derived from Eppley’s Vertically Generalized Production Model, based on SeaWiFS and MODIS-Aqua and available at the Ocean Productivity site. Upwelling intensity was estimated using the difference in sea surface temperature (SST) between off and nearshore zones. Advanced Very-High Resolution Radiometer (AVHRR) 4 km SST were obtained from Pathfinder database. Other phytoplankton environmental drivers, such as local (e.g., river flow) and global (e.g., North Atlantic Oscillation - NAO) climate variables, were also analysed. The study area was divided into subareas differently impacted by upwelling and riverine flow, and satellitederived data was averaged for each zone. Seasonal and interannual variability covering a 14-year time series (1998- 2011) for each variable/region were explored. Chl-a at offshelf locations was significantly lower than coastal areas, and exhibited a fairly stable unimodal annual cycle, with maximum during March. Coastal locations displayed more variable annual patterns, with spring and summer Chl-a maxima, reflecting the impact of upwelling events and freshwater inputs. In respect to interannual variability, NAO index and coastal Chl-a were negative and significantly correlated, with 1-month lag. Chl-a interannual trends were also correlated to local climate variables, namely riverine flow for the easternmost coastal zone. The correlation between upwelling intensity and phytoplankton off SW Iberia is region-dependent being less strong within regions dominated by riverine influence.por
dc.identifier.citationKrug LA, Kathleen M. Silvano, Ana B. Barbosa, Rita B. Domingues, Helena M. Galvão, Joaquim Luís, Trevor Platt, Paulo Relvas and Shubha Sathyendranath, 2012. Connections between upwelling patterns and phytoplankton variability under different coastal regimes in SW Iberia Peninsula. Proceedings Ocean Optics XXI Conference, October 8 - 12, 2012, Glasgow, Scotland, 11 p.por
dc.identifier.otherAUT: HGA00327; JLU00339; ABA00694;
dc.identifier.urihttp://hdl.handle.net/10400.1/1906
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectPhytoplanktonpor
dc.subjectChlorophyllpor
dc.subjectIberiapor
dc.subjectRemote sensingpor
dc.subjectOcean colorpor
dc.subjectUpwelling patternspor
dc.titleConnections between upwelling patterns and phytoplankton variability under different coastal regimes in SW Iberia Peninsulapor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceGlasgow, Scotlandpor
oaire.citation.titleProceedings Ocean Optics XXI Conference, October 8 - 12, 2012por
person.familyNameKrug
person.familyNameBarbosa
person.familyNameDomingues
person.familyNameGalvão
person.familyNameLuis
person.familyNameRelvas
person.givenNameLilian
person.givenNameAna
person.givenNameRita
person.givenNameHelena
person.givenNameJoaquim
person.givenNamePaulo
person.identifier640932
person.identifier1291299
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person.identifier.ciencia-id2412-1F65-A044
person.identifier.orcid0000-0002-0066-7679
person.identifier.orcid0000-0002-7402-246X
person.identifier.orcid0000-0002-7107-8222
person.identifier.orcid0000-0003-0939-8994
person.identifier.orcid0000-0002-9035-4069
person.identifier.orcid0000-0002-6404-5895
person.identifier.ridA-1112-2009
person.identifier.ridB-1257-2008
person.identifier.scopus-author-id23479793500
person.identifier.scopus-author-id7103244778
person.identifier.scopus-author-id8627143500
person.identifier.scopus-author-id6505974701
person.identifier.scopus-author-id7006391353
person.identifier.scopus-author-id6505976206
rcaap.rightsrestrictedAccesspor
rcaap.typeconferenceObjectpor
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