Chemometric studies in the Lagoon of Venice, Italy. Annual evolution of sulphur species and relationship to biogeochemical cycles in lagoon water.
During the period March 1997-March 1998 dimethyl sulphide (DMS), dimethylsulphoniopropionate (DMSP) and carbon disulphide (CS2) were determined weekly in the water of the Lagoon of Venice, Italy (at three stations located in the Giudecca Canal, the San Secondo Canal and the Rio di San Nicolò). At the same time, the following hydrological and biological variables were also measured: tide height, temperature, transmittance, fluorescence, pH, salinity, chlorinity, sulphate, ammonia, nitrite, nitrate, phosphate, silicate, chlorophyll a, phaeopigments, phytoplankton (abundance and biomass). Principal component analysis (PCA), applied as a dimension reduction tool, made it possible to summarize multivariate information in a small number of components, which highlighted the relationships between the temporal evolutions of the sulphur compounds with hydrological and biological variables in the seasonal biogeochemical cycle of the lagoon. In particular the overall temporal cycle, which begins with the development of biological activity in late winter and spring, followed by the predominance of degradation processes during the late summer and the remineralization of nutrients in autumn, is clearly described in the plane of the first two principal components, together with the interrelationships between all the relevant variables.
Dipartimento di Scienze Ambientali, Università Ca' Foscari, Dorsoduro 2137, I-30123 Venezia, Italy.
Ivo
I
Moret
Andrea
A
Gambaro
Rossano
R
Piazza
Fabiana
F
Corami
Cesare
C
Ravazzi
Carlo
C
Andreoli
Cristina
C
Truzzi
Luca
L
Lambertucci
Giuseppe
G
Scarponi
D004784:Environmental Monitoring; D055593:Geological Phenomena; D005844:Geology; D006863:Hydrogen-Ion Concentration; D007558:Italy; D012621:Seasons; D013457:Sulfur Compounds / Q000032:analysis* / Q000737:chemistry; D014867:Water / Q000737:chemistry
D013457:Sulfur Compounds; D014867:Water