{"refrec":{"BRefID":7134,"RR":"<b>Rojas, C.M.; Injuk, J.; Van Grieken, R.E.; Maenhaut, W.</b> (2000). Atmospheric particulate element concentrations and deposition rates in French Polynesia. <i>J. Rech. Océanogr. 25(3-4)</i>: 74-86","BEntID":7134,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>J. Rech. Océanogr. 25(3-4)</i>: 74-86","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rojas, C.M.; Injuk, J.; Van Grieken, R.E.; Maenhaut, W.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rojas, C.M. <i>et al.</i>","Englishabstract":"Over a period of eight months, a total of 26 atmospheric particulate matter samples were collected at the location of Tahiti and in other areas of French Polynesia, using a specially equipped sailboat. A 6-stage cascade impact or was used to separate aerosols in the following size classes: > 4,2-4, 1-2,0.5-1,0.25-0.5 and < 0.25 µm equivalent aerodynamic diameter. The resulting set of 156 size segregated aerosol samples was analyzed by particle-induced X-ray emission for 16 elements. This study deals with the concentrations of Na, Mg, Al, Si, S, Cl, K, Ca, Ti, Mn, Fe, Cu, Zn, Br, Sr and Pb. Enrichment factor calculations reveal that Na, Mg, S, A, K, Ca and Sr were little fractionated with respect to bulk sea water, whereas Al, Si, Ti, Mn and Fe presented no enrichment relative to the earth's crust. The anomalously enriched elements were Cu, Zn, Br and Pb. The multivariate technique factor analysis was used to identify the various aerosol sources. Dry and wet deposition modeling enabled us to estimate the atmospheric dry and wet transfer to the sea. Dry deposition velocities ranged from 0.04 to 0.2 cm S<sup>-1</sup>, while the scavenging rates were of the order of 2-3 x10<sup>-6</sup> S<sup>-1</sup>. The resulting deposition rates are within the range given in the literature, with a good agreement for the deposition of Mn, Cu and Zn. It was found that dry deposition dominates over wet deposition for the sea derived elements, while for the crustal elements, the situation was the opposite. The estimated annual atmospheric deposition of Cu is equal to that of other geochemical cycles such as marine sedimentation and vertical mixing, whereas the deposition rates of mineral aerosol and Pb are much higher than those reported previously, indicating direct influence of local emissions from Tahiti.","AbstractOtherLang":"<i>Concentration en éléments et taux de déposition de particules atmosphériques en Polynésie Française</i>. Pendant une période de 8 mois, un total de 26 échantillons de particules atmosphériques ont été collectées, à bord d'un bateau spécialement équipé, à Tahiti mais également dans d'autres regions de Polynésie française. Un impacteur à cascade de 6 étages à été utilisé pour séparer les aérosols selon les classes granulométriques suivantes: > 4,2-4,1-2, 0.5-1, 0.25-0.5 et <0.25 µm (diamètre aérodynamique). La série de 156 échantillons séparés par tailles de particules ainsi obtenue a été analysée par PIXE (particle-induced X-ray emission) pour 25 éléments. Cette étude donne la concentration en Na, Mg, Al, Si, S, Cl, K, Ca, Ti, Mn, Fe, Cu, Zn, Br, Sr and Pb pour chaque échantillon. Un facteur de concentration a été calculé, il montre un léger enrichissement des particules en Na, Mg, Si, S, Cl, K, Ca et Sr par comparaison avec la composition de l'eau de mer, alors que les concentrations en Al, Si, Ti, Mn et Fe sont comparables à celles de la croûte terrestre. Un enrichissement anormal en Cu, Zn, Br et Pb a été constaté. La technique d'analyse factorielle multivariée a été utilisée pour identifier les sources des aérosols. La modélisation des dépôts secs par sédimentation et des retombées humides nous a permis d'estimer le transfert atmosphérique des particules vers la mer. La vitesse de sédimentation varie de 0.04 à 0.2 cm S<sup>-1</sup>, alors que la vitesse des précipitations est de l'ordre de 2- 3x10<sup>-6</sup> S<sup>-1</sup>. Les taux de dépôt obtenus correspondent aux valeurs données dans la littérature, avec un bon accord pour les taux de retombées en Mn, Cu et Zn. Nous avons observé que le mécanisme de dépôt des éléments provenant de la mer était la sédimentation plutôt que l'entraînement par les précipitations. La situation inverse a été constatée pour les éléments d'origine térrigène. Le depôt annuel de Cu atmophérique a été estimé égal à celui des autres phénomènes géochimiques tels que la sédimentation marine et l'apport troposphérique. En revanche, les taux de sédimentation des aérosols minéraux et du plomb sont supérieurs à ceux rapportés dans la littérature. Ceci témoigne d'une influence directe de l'émission locale provenant de Tahiti.","BibLvlCode":"AS","StandardTitle":"Atmospheric particulate element concentrations and deposition rates in French Polynesia","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Aerosol, PIXE, atmospheric deposition, multivariate analysis, deposition modeling","OtherDescriptors":"Aerosols; Multivariate analysis; Sedimentary environments; Samples; Heavy metals; ISE, Pacific, French Polynesia","Notes":null,"AnaPub":2000,"MonPub":null,"DateUpdate":"2017-03-15","DateCreate":"2001-03-27","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":7134,"PubliDate":2000,"Pagination":"74-86","XtraPublOfAnaID":null,"ISBN":null,"Volume":"25","Issue":"3-4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43197,"SerRR":"Journal de Recherche Océanographique. 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