http://http://dspace.unitus.it:80 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Tue, 21 May 2013 06:24:34 GMT 2013-05-21T06:24:34Z http://hdl.handle.net/2067/1632 Title: Development of a new expendable probe for the study of pelagic ecosystems from voluntary observing ships Authors: Marcelli, Marco; Di Maio, Antonia; Donis, Daphne; Mainardi, Umberto; Manzella, Giuseppe Abstract: Physical and biological processes of the marine ecosystem have a high spatial and temporal variability, whose study is possible only through high resolution and synoptic observations. The Temperature and Fluorescence Launchable Probe was charted in order to answer to the claim of a cost effective temperature and fluorescence expendable profiler, to be used in ships of opportunity. The development of the expendable fluorometer has followed similar concepts of the XBT (a wire conducting the signal to a computer card), but differently from the latter it was developed with an electronic system which can be improved and adapted to several variables measure channels. To reach the aim of a low-cost probe, were utilized commercial components:a glass bulb temperature resistor for the temperature measurement, blue LEDs, a photodiode and available selective glass filters, for the fluorescence measurement. The measurement principle employed to detect phytoplankton’s biomass is the active fluorescence. This method is an in vivo chlorophyll estimation, that can get the immediate biophysical reaction of phytoplankton inside the aquatic environment; it is a non-disruptive method which gives real time estimation and avoids the implicit errors due to the manipulation of samples. The possibility of using a continuous profiling probe, with an active fluorescence measurement, is very important in real time phytoplankton’s study; it is the best way to follow the variability of sea productivity. In fact, because of the high time and space variability of phytoplankton, due to its capability to answer in a relatively short time to ecological variations in its environment and because of its characteristic patchiness, there isn’t a precise quantitative estimation of the biomass present in the Mediterranean Sea. Description: L'articolo è disponibile sul sito dell'editore http://publications.copernicus.org/ Sun, 31 Dec 2006 23:00:00 GMT http://hdl.handle.net/2067/1632 2006-12-31T23:00:00Z http://hdl.handle.net/2067/1639 Title: New low cost technological developments for sea monitoring: satellite "Sea Truth" and model validation Authors: Marcelli, Marco; Piermattei, Viviana; Petri, Alessandra; Madonia, Alice; Pannocchi, Andrea; Mainardi, Umberto Abstract: Operational forecasting is becoming an important tool for modern management and protection of the oceans and their living resources. It needs multidisciplinary input data, whose collection is hampered by two main factors: cost and technology. Satellites provide synoptic sea surface data, but their measurement validation still requires much sea-truth data as possible. Moreover marine “in situ” measures are expansive both for the platforms, ships and buoys, and for the measure instruments. In order to face these problems, initiatives (e.g. VOS) have been developed to use opportunity platforms and to promote the development of low-cost and user-friendly technologies. This work shows new cost-effective technological developments to provide a useful strategy for surface and sub-surface marine monitoring. Thu, 31 Dec 2009 23:00:00 GMT http://hdl.handle.net/2067/1639 2009-12-31T23:00:00Z