{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T11:05:45Z","timestamp":1762254345311,"version":"build-2065373602"},"reference-count":34,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2022,12,1]],"date-time":"2022-12-01T00:00:00Z","timestamp":1669852800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"CESAM","award":["UIDP\/50017\/2020+UIDB\/50017\/2020+ LA\/P\/0094\/2020"],"award-info":[{"award-number":["UIDP\/50017\/2020+UIDB\/50017\/2020+ LA\/P\/0094\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JMSE"],"abstract":"<jats:p>In recent decades, several studies have highlighted the importance of the temporal and spatial structure of upwelling in defining the high levels of productivity of coastal upwelling systems. This work intends to assess the temporal and spatial trends of upwelling along the west and south Portuguese coasts from 1979 to 2020, comparing the patterns between these regions. Two different methodologies to calculate the upwelling indexes (UI), based on wind and sea surface temperature (SST) data, were applied to relate the wind-induced upwelling-favourable conditions (UIET) with the expected response on superficial waters, as indicated by the SST patterns (UISST). The upwelling-favourable conditions are quite consistent and more frequent and intense on the west coast than on the south coast. Spatially, it was verified from the UIET that upwelling-favourable conditions are more intense in association with the main west coast capes and that there is an intensification of favourable winds towards Cape S\u00e3o Vicente, both on the west and south coasts. Seasonally, upwelling-favourable UIET was found to be more consistent in the summer on both coasts. However, it also exists in the winter months. In terms of interannual variations, it should be highlighted that between 1992 and 2005 more intense favourable conditions and an apparent change in the seasonality after 2015 were found. Although some of the results derived from the UIET are corroborated by the UISST (namely, the main spatial trends and interannual variations in the upwelling intensity), several uncertainties are associated with the last index that interfere with its interpretation. For future works, it is advisable to develop a more robust SST-based index that can circumvent the uncertainties pointed out in the present study.<\/jats:p>","DOI":"10.3390\/jmse10121849","type":"journal-article","created":{"date-parts":[[2022,12,2]],"date-time":"2022-12-02T02:18:06Z","timestamp":1669947486000},"page":"1849","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["New Insights about Upwelling Trends off the Portuguese Coast: An ERA5 Dataset Analysis"],"prefix":"10.3390","volume":"10","author":[{"given":"Spallou","family":"Ferreira","sequence":"first","affiliation":[{"name":"Physics Department, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2575-3263","authenticated-orcid":false,"given":"Magda","family":"Sousa","sequence":"additional","affiliation":[{"name":"CESAM, Centre for Environmental and Marine Studies, Physics Department, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8685-5194","authenticated-orcid":false,"given":"Ana","family":"Picado","sequence":"additional","affiliation":[{"name":"CESAM, Centre for Environmental and Marine Studies, Physics Department, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8484-6948","authenticated-orcid":false,"given":"Nuno","family":"Vaz","sequence":"additional","affiliation":[{"name":"CESAM, Centre for Environmental and Marine Studies, Physics Department, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7613-6241","authenticated-orcid":false,"given":"Jo\u00e3o Miguel","family":"Dias","sequence":"additional","affiliation":[{"name":"CESAM, Centre for Environmental and Marine Studies, Physics Department, Campus de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1016\/0272-7714(90)90063-W","article-title":"A persistent upwelling off the Central Cantabrian Coast (Bay of Biscay)","volume":"30","author":"Botas","year":"1990","journal-title":"Estuar. Coast. Shelf Sci."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"375","DOI":"10.1046\/j.1365-2419.1998.00064.x","article-title":"Relationships between anchovy (Engraulis encrasicolus) recruitment and environment in the Bay of Biscay (1967\u20131996)","volume":"7","author":"Borja","year":"1998","journal-title":"Fish. Oceanogr."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"477","DOI":"10.1111\/j.1365-2419.2008.00494.x","article-title":"Climate, oceanography, and recruitment: The case of the Bay of Biscay anchovy (Engraulis encrasicolus)","volume":"17","author":"Borja","year":"2008","journal-title":"Fish. Oceanogr."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1016\/S0924-7963(02)00187-2","article-title":"Intrusions of eastern North Atlantic central waters and phytoplankton in the north and northwestern Iberian shelf during spring","volume":"36","author":"Bode","year":"2002","journal-title":"J. Mar. Syst."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2002JC001361","article-title":"Spatial patterns of wind and sea surface temperature in the Galician upwelling region","volume":"108","author":"Torres","year":"2003","journal-title":"J. Geophys. Res. Ocean."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"G\u00f3mez-Gesteira, M., Moreira, C., Alvarez, I., and De Castro, M. (2006). Ekman transport along the Galician coast (northwest Spain) calculated from forecasted winds. J. Geophys. Res. Ocean., 111.","DOI":"10.1029\/2005JC003331"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/j.jmarsys.2007.01.013","article-title":"Ekman transport along the Galician Coast (NW, Spain) calculated from QuikSCAT winds","volume":"72","author":"Alvarez","year":"2008","journal-title":"J. Mar. Syst."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Alvarez, I., G\u00f3mez-Gesteira, M., DeCastro, M., and Dias, J.M. (2008). Spatiotemporal evolution of upwelling regime along the western coast of the Iberian Peninsula. J. Geophys. Res., 113.","DOI":"10.1029\/2008JC004744"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"589","DOI":"10.1006\/jmsc.2001.1060","article-title":"Sardine and horse mackerel recruitment and upwelling off Portugal","volume":"58","author":"Santos","year":"2001","journal-title":"ICES J. Mar. Sci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1016\/j.csr.2003.10.004","article-title":"Impact of a winter upwelling event on the distribution and transport of sardine (Sardina pilchardus) eggs and larvae off western Iberia: A retention mechanism","volume":"24","author":"Santos","year":"2004","journal-title":"Cont. Shelf Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1016\/j.seares.2010.03.004","article-title":"The effects of a winter upwelling on biogeochemical and planktonic components in an area close to the Galician Upwelling Core: The Sound of Corcubi\u00f3n (NW Spain)","volume":"64","author":"Varela","year":"2010","journal-title":"J. Sea Res."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Picado, A., Alvarez, I., Vaz, N., and Dias, J.M. (2013). Chlorophyll concentration along the northwestern coast of the Iberian Peninsula vs. atmosphere-ocean-land conditions. J. Coast. Res., 2047\u20132052.","DOI":"10.2112\/SI65-346.1"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"869","DOI":"10.1016\/S0272-7714(02)00309-8","article-title":"Hydrographic characterization of a winter-upwelling event in the Ria of Pontevedra (NW Spain)","volume":"56","author":"Alvarez","year":"2003","journal-title":"Estuar. Coast. Shelf Sci."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"573","DOI":"10.1016\/j.ecss.2009.02.023","article-title":"A winter upwelling event in the Northern Galician Rias: Frequency and oceanographic implications","volume":"82","author":"Alvarez","year":"2009","journal-title":"Estuar. Coast. Shelf Sci."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"388","DOI":"10.1016\/j.csr.2010.07.009","article-title":"Comparative analysis of upwelling influence between the western and northern coast of the Iberian Peninsula","volume":"31","author":"Alvarez","year":"2010","journal-title":"Cont. Shelf Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"235","DOI":"10.3989\/scimar.2003.67s1235","article-title":"Sardine regime shifts off Portugal: A time series analysis of catches and wind conditions","volume":"67","author":"Borges","year":"2003","journal-title":"Sci. Mar."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"529","DOI":"10.1016\/j.ecss.2006.03.004","article-title":"Hydrographic and atmospheric analysis of an autumnal upwelling event in the Ria of Vigo (NW Iberian Peninsula)","volume":"68","author":"DeCastro","year":"2006","journal-title":"Estuar. Coast. Shelf Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1016\/j.jmarsys.2007.04.005","article-title":"Characterization of fall-winter upwelling recurrence along the Galician western coast (NW Spain) from 2000 to 2005: Dependence on atmospheric forcing","volume":"72","author":"DeCastro","year":"2008","journal-title":"J. Mar. Syst."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1016\/j.ecss.2007.02.004","article-title":"Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula)","volume":"73","author":"Prego","year":"2007","journal-title":"Estuar. Coast. Shelf Sci."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1016\/j.seares.2014.01.008","article-title":"Assessment of chlorophyll variability along the northwestern coast of Iberian Peninsula","volume":"93","author":"Picado","year":"2014","journal-title":"J. Sea Res."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"28-1","DOI":"10.1029\/2000JC000456","article-title":"Mesoscale patterns in the Cape S\u00e3o Vicente (Iberian Peninsula) upwelling region","volume":"107","author":"Relvas","year":"2002","journal-title":"J. Geophys. Res."},{"key":"ref_22","first-page":"31","article-title":"Climatological space and time variation of the Portuguese coastal upwelling","volume":"5","author":"Guerreiro","year":"1982","journal-title":"Oceanol. Acta"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Leit\u00e3o, F., Baptista, V., Vieira, V., Silva, P.L., Relvas, P., and Teod\u00f3sio, M.A. (2019). A 60-year time series analyses of the upwelling along the Portuguese coast. Water, 11.","DOI":"10.3390\/w11061285"},{"key":"ref_24","unstructured":"(2021, January 26). COPERNICUS. Available online: https:\/\/cds.climate.copernicus.eu\/."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"112741","DOI":"10.1016\/j.rser.2022.112741","article-title":"Analysing the uncertainties of reanalysis data used for wind resource assessment: A critical review","volume":"167","author":"Gualtieri","year":"2022","journal-title":"Renew. Sustain. Energy Rev."},{"key":"ref_26","unstructured":"Large, W.G., and Yeager, S. (2004). Diurnal to Decadal Global Forcing For Ocean and Sea-Ice Models: The Data Sets and Flux Climatologies. NCAR Tech. Note."},{"key":"ref_27","unstructured":"Bakun, A. (1973). Coastal Upwelling Indices, West Coast of North America, 1946\u20131971."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2813","DOI":"10.1007\/s00382-012-1442-9","article-title":"Climate change and upwelling: Response of Iberian upwelling to atmospheric forcing in a regional climate scenario","volume":"40","author":"Miranda","year":"2013","journal-title":"Clim. Dyn."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.pocean.2015.11.006","article-title":"New insights into the Western Iberian Buoyant Plume: Interaction between the Douro and Minho River plumes under winter conditions","volume":"141","author":"Mendes","year":"2016","journal-title":"Prog. Oceanogr."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"821","DOI":"10.1006\/ecss.2000.0714","article-title":"Surface Waters of the NW Iberian Margin: Upwelling on the Shelf versus Outwelling of Upwelled Waters from the R\u00edas Baixas","volume":"51","author":"Gago","year":"2000","journal-title":"Estuar. Coast. Shelf Sci."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1029\/2004JC002504","article-title":"Inter- and intra-annual analysis of the salinity and temperature evolution in the Galician R\u00edas Baixas-ocean boundary (northwest Spain)","volume":"110","author":"Alvarez","year":"2005","journal-title":"J. Geophys. Res. Ocean."},{"key":"ref_32","first-page":"316","article-title":"Global greenhouse effects, multi-decadal wind trends, and potential impacts on coastal pelagic fish populations","volume":"195","author":"Bakun","year":"1992","journal-title":"ICES Mar. Sci. Symp."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1213","DOI":"10.1111\/j.1365-2486.2009.02094.x","article-title":"Greenhouse gas, upwelling-favorable winds, and the future of coastal ocean upwelling ecosystems","volume":"16","author":"Bakun","year":"2009","journal-title":"Glob. Chang. Biol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1002\/joc.1009","article-title":"The upwelling regime off the west Portuguese coast, 1941\u20132000","volume":"24","author":"Lemos","year":"2004","journal-title":"Int. J. Climatol."}],"container-title":["Journal of Marine Science and Engineering"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-1312\/10\/12\/1849\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:32:08Z","timestamp":1760146328000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-1312\/10\/12\/1849"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,12,1]]},"references-count":34,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2022,12]]}},"alternative-id":["jmse10121849"],"URL":"https:\/\/doi.org\/10.3390\/jmse10121849","relation":{},"ISSN":["2077-1312"],"issn-type":[{"type":"electronic","value":"2077-1312"}],"subject":[],"published":{"date-parts":[[2022,12,1]]}}}