{"refrec":{"BRefID":36313,"RR":"<b>Conde, D.; Aubriot, L.; Sommaruga, R.</b> (2000). Changes in UV penetration associated with marine intrusions and freshwater discharge in a shallow coastal lagoon of the Southern Atlantic Ocean. <i>Mar. Ecol. Prog. Ser. 207</i>: 19-31","BEntID":36313,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 207</i>: 19-31","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Conde, D.; Aubriot, L.; Sommaruga, R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Conde, D.; Aubriot, L.; Sommaruga, R.","Englishabstract":"We studied the changes in UV penetration associated with the dynamics of a shallow (mean depth = 0.6 m) coastal lagoon of South America that communicates periodically with the Atlantic Ocean. Two characteristic situations, i.e., freshwater dominance and salt-wedge intrusion were considered. Nine stations were sampled along the main axis of the lagoon, the main tributary, and the adjacent coast. The attenuation in the UV-B, UV-A and PAR wavebands were related to changes in the concentration of dissolved organic carbon (DOC), chlorophyll  <i>a</i> (chl <i>a</i>), absorption (a <sub>d</sub>) of the chromophoric dissolved organic matter (CDOM), fluorescence of CDOM (F <sub>d</sub>), organic (OSS) and inorganic (ISS) suspended solids. The area most influenced by the marine intrusion showed the lowest DOC concentration (1.8 mg l<sup>-1</sup>) and the highest UV penetration. In this area, the depth corresponding to 10% of the irradiance below the surface (Z <sub>10%</sub>) accounted for 66 and 100% of the water column for the UV-B and UV-A wavebands, respectively (diffuse attenuation coefficient, K <sub>d </sub>= 7.3 and 2.1 m<sup>-1</sup>). The other zones of the lagoon (DOC = 5.7 to 9.3 mg l<sup>-1</sup>) presented low UV-B penetration (K <sub>d</sub> = 29 to 64 m<sup>-1</sup>), and the Z <sub>10%</sub> for UV-A accounted for 30 to 64% of the water column (K <sub>d</sub> = 7 to 14 m<sup>-1</sup>). Under both hydrological situations, the Z <sub>10%</sub> for PAR reached the bottom in most parts of the lagoon (K <sub>d</sub> = 1 to 5 m<sup>-1</sup>). A significant reduction in DOC-specific absorption (a <sub>d</sub>*) during the marine intrusion indicated a change in the absorption characteristics of the CDOM. The variability in K <sub>d</sub> for UV-B radiation was mainly explained by the concentration of dissolved and particulate organic substances, while the K <sub>d</sub> values for UV-A and PAR were best predicted by the concentration of DOC","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Changes in UV penetration associated with marine intrusions and freshwater discharge in a shallow coastal lagoon of the Southern Atlantic Ocean","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2000,"MonPub":null,"DateUpdate":"2003-07-15","DateCreate":"2003-07-15","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000166168900003","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":36313,"PubliDate":2000,"Pagination":"19-31","XtraPublOfAnaID":null,"ISBN":null,"Volume":"207","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe.  ISSN 0171-8630; e-ISSN 1616-1599","StandardTitleSer":"Marine Ecology Progress Series","ISSN":"0171-8630","AbbrevSer":"Mar. Ecol. Prog. 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