{"refrec":{"BRefID":53985,"RR":"<b>Schmidt, S.; Chou, L.; Hall, I.R.</b> (2002). Particle residence times in surface waters over the north-western Iberian margin: comparison of pre-upwelling and winter periods. <i>J. Mar. Syst. 32(1-3)</i>: 3-11. <a href=\"https://dx.doi.org/10.1016/S0924-7963(02)00027-1\" target=\"_blank\">https://dx.doi.org/10.1016/S0924-7963(02)00027-1</a>","BEntID":29810,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Mar. Syst. 32(1-3)</i>: 3-11. <a href=\"https://dx.doi.org/10.1016/S0924-7963(02)00027-1\" target=\"_blank\">https://dx.doi.org/10.1016/S0924-7963(02)00027-1</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Schmidt, S.; Chou, L.; Hall, I.R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Schmidt, S.; Chou, L.; Hall, I.R.","Englishabstract":"Thorium-234 is used over the north-western Iberian Margin as a tracer of sinking particle fluxes on time scales of days to weeks. As a part of Ocean Margin Exchange (OMEX) project (II-II), samples were collected during pre-upwelling (June 1997) and winter (January 1998) periods. During the pre-upwelling situation, the distribution of total <sup>234</sup>Th is rather uniform, with a mean deficiency of 24%. In contrast, particulate <sup>234</sup>Th activities increase from the shelf to open ocean. As a result, particle residence times derived from <sup>234</sup>Th show a considerable range between 4 and 45 days, with a mean value of about 26 days. In the shelf waters, there is no clear trend in particle residence time, whereas the offshore stations present a more obvious signal with a gradual increase from about 10 days over the slope to nearly 30 days in the open ocean. In winter, total <sup>234</sup>Th activities are more variable, and both deficit and equilibrium situations are observed. The mean deficit of total <sup>234</sup>Th is low, about 10%, which may reflect reduced export fluxes at this time. Moreover, in the shelf waters during winter, particulate <sup>234</sup>Th presents higher levels when compared with the pre-upwelling situation, which may be due to more intense resuspension of shallow sediments. As a consequence, average near-surface particle residence times are significantly longer in winter, with a mean value of 113 days. Estimates of export flux of particulate organic carbon (POC) from the upper ocean, using the ratio of POC and <sup>234</sup>Th of particles, range between 1 and 56 mmol C m<sup>-2</sup> day<sup>-1</sup> in June 1997, and ca. 0 and 25 mmol C m<sup>-2</sup> day<sup>-1</sup> in January 1998. These variations reflect the large differences in hydrographic conditions and primary production levels between the two seasonal situations.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Particle residence times in surface waters over the north-western Iberian margin: comparison of pre-upwelling and winter periods","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-21 01:31:35.778224","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"continental margin; particle; residence time; seasonal time scale; Th-234; particulate organic carbon","OtherDescriptors":"Particle; Residence time; Seasonal time scale; Th-234; NE Atlantic; Iberian Margin","Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2022-02-17","DateCreate":"2003-11-26","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000175832700002","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/S0924-7963(02)00027-1"},"refs":null,"anarec":{"AnaID":53985,"PubliDate":2002,"Pagination":"3-11","XtraPublOfAnaID":null,"ISBN":null,"Volume":"32","Issue":"1-3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43079,"SerRR":"Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam.  ISSN 0924-7963; e-ISSN 1879-1573","StandardTitleSer":"Journal of Marine Systems","ISSN":"0924-7963","AbbrevSer":"J. Mar. Syst.","StandardTitleMon":null,"StartPage":3,"Pages":9,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":[{"YBRefID":29809,"RefStrFull":"<b>Frankignoulle, M. (Ed.)</b> (2002). Exchange Processes at the Ocean Margins. Selected papers from the 32nd International Liège Colloquium on Ocean Hydrodynamics, held in Liège, Belgium on May 8-12, 2000. <i>Journal of Marine Systems</i>, 32(1-3). Elsevier: Amsterdam. ex1-ex2, 252 pp.","RelID":10,"Relation":"Also appears in","StandardTitle":"Exchange Processes at the Ocean Margins. 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