A method is presented for the analysis and modeling of the 3-D physical structure of a seawater volume using CTD-STD oceanographic measurements, along with some issues for its generalization and examples of application in two areas in the NW Adriatic Sea, which present coastal fronts generated by freshwater inputs into the basin. The procedure accepts on input x(lon),y(lat),z,v points (where v is the physical parameter, for example salinity) and it produces on output a set of 2-D grids for any selected z interval, which are integrated to a 3-D volume and bounded with the more appropriate masking operations to avoid function discontinuities. Several seawater volume estimations can therefore be obtained for any particular range of ?and made available for the calculations of budgets of other biogeochemical parameters measured in the same areaa, e.g. nutrients. The procedure (a mix of PERL,C and GMT software) was made as automated as possible and it can supposedly be generalized for other physical properties. The application presented in this repoort is based on the CTD dataset (n=500000) collected by the undulating tow-fish SARAGO during four winter and summer cruises (from June 1996 to February 1998) in two areas: South of the Po River Delta and along the Italian coast between Cattolica and Ancona. Before being input to the procedure, the data were statistically filtered to remove spikes and navigation problems. and they were afterwards re-calibrated against CTD profile obtained from ship's station. The 3-D salinity fields were reproduced in 7 boxes with surface ranging from 554 up to 1089 Km2 where the corresponding volumes ranged from 11.6 to 27.4 Km3.
A method for surface and volume analysis of a 3-D function with an application to salinity data acquired by the tow-fish SARAGO during cruises U1-U2-U3-U4 (PRISMA2 Project, Adriatic Sea)
Bortoluzzi G;Cozzi S;Di Maio A;
2001
Abstract
A method is presented for the analysis and modeling of the 3-D physical structure of a seawater volume using CTD-STD oceanographic measurements, along with some issues for its generalization and examples of application in two areas in the NW Adriatic Sea, which present coastal fronts generated by freshwater inputs into the basin. The procedure accepts on input x(lon),y(lat),z,v points (where v is the physical parameter, for example salinity) and it produces on output a set of 2-D grids for any selected z interval, which are integrated to a 3-D volume and bounded with the more appropriate masking operations to avoid function discontinuities. Several seawater volume estimations can therefore be obtained for any particular range of ?and made available for the calculations of budgets of other biogeochemical parameters measured in the same areaa, e.g. nutrients. The procedure (a mix of PERL,C and GMT software) was made as automated as possible and it can supposedly be generalized for other physical properties. The application presented in this repoort is based on the CTD dataset (n=500000) collected by the undulating tow-fish SARAGO during four winter and summer cruises (from June 1996 to February 1998) in two areas: South of the Po River Delta and along the Italian coast between Cattolica and Ancona. Before being input to the procedure, the data were statistically filtered to remove spikes and navigation problems. and they were afterwards re-calibrated against CTD profile obtained from ship's station. The 3-D salinity fields were reproduced in 7 boxes with surface ranging from 554 up to 1089 Km2 where the corresponding volumes ranged from 11.6 to 27.4 Km3.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
