Caracterización óptica de las lagunas Sauce Grande y Chasicó (provincia de Buenos Aires)

The aim of this work was to evaluate the optical characteristics and the physical and chemicals parameters in order to determine zones in the Sauce Grande and Chasicó shallow lakes (Buenos Aires province). A portable spectroradiometer was used to obtain the reflectance spectra. The measurements were done in February, 2010. The chlorophyll-a values were obtained in laboratory from surface-derived water samples. A multiparameter probe was used to obtain the in situ parameters. Water transparency was estimated using a Secchi disc. As a result from the statistical analysis by the spectral signature from water, 3 zones were obtained in every lake. In Chasicó lake, the zone 1 represented the center-south area in the lake; the zone 2 was coincident with the NW in the lake whereas the zone 3 was related to the Chasicó river mouth. In Sauce Grande shallow lake, the subzones represented: the NNE area in the lake (zone 1); E and SE of the water body (zone 2) and the Sauce Grande river mouth (zone 3). The maximum depth in the Chasicó lake was 9 m whereas in Sauce Grande shallow lake was 1,50 m. As a consequence, the reflectance values in the Sauce Grande shallow pond surpassed the 8% and in the Chasicó lake the reflectance values did not surpass the 6%. Even though both water bodies are shallow, the effect from the bottom was more evident in the Sauce Grande lake than in Chasicó lake.Instituto de Limnología "Raúl A. Ringuelet

Caracterización óptica de las lagunas Sauce Grande y Chasicó (provincia de Buenos Aires)

The aim of this work was to evaluate the optical characteristics and the physical and chemicals parameters in order to determine zones in the Sauce Grande and Chasicó shallow lakes (Buenos Aires province). A portable spectroradiometer was used to obtain the reflectance spectra. The measurements were done in February, 2010. The chlorophyll-a values were obtained in laboratory from surface-derived water samples. A multiparameter probe was used to obtain the in situ parameters. Water transparency was estimated using a Secchi disc. As a result from the statistical analysis by the spectral signature from water, 3 zones were obtained in every lake. In Chasicó lake, the zone 1 represented the center-south area in the lake; the zone 2 was coincident with the NW in the lake whereas the zone 3 was related to the Chasicó river mouth. In Sauce Grande shallow lake, the subzones represented: the NNE area in the lake (zone 1); E and SE of the water body (zone 2) and the Sauce Grande river mouth (zone 3). The maximum depth in the Chasicó lake was 9 m whereas in Sauce Grande shallow lake was 1,50 m. As a consequence, the reflectance values in the Sauce Grande shallow pond surpassed the 8% and in the Chasicó lake the reflectance values did not surpass the 6%. Even though both water bodies are shallow, the effect from the bottom was more evident in the Sauce Grande lake than in Chasicó lake.Instituto de Limnología "Raúl A. Ringuelet

Letter of intent for KM3NeT 2.0

The main objectives of the KM3NeT Collaboration are ( i ) the discovery and subsequent observation of high-energy neutrino sources in the Universe and ( ii ) the determination of the mass hierarchy of neutrinos. These objectives are strongly motivated by two recent important discoveries, namely: ( 1 ) the high- energy astrophysical neutrino signal reported by IceCube and ( 2 ) the sizable contribution of electron neutrinos to the third neutrino mass eigenstate as reported by Daya Bay, Reno and others. To meet these objectives, the KM3NeT Collaboration plans to build a new Research Infrastructure con- sisting of a network of deep-sea neutrino telescopes in the Mediterranean Sea. A phased and distributed implementation is pursued which maximises the access to regional funds, the availability of human resources and the syner- gistic opportunities for the Earth and sea sciences community. Three suitable deep-sea sites are selected, namely off-shore Toulon ( France ) , Capo Passero ( Sicily, Italy ) and Pylos ( Peloponnese, Greece ) . The infrastructure will consist of three so-called building blocks. A building block comprises 115 strings, each string comprises 18 optical modules and each optical module comprises 31 photo-multiplier tubes. Each building block thus constitutes a three- dimensional array of photo sensors that can be used to detect the Cherenkov light produced by relativistic particles emerging from neutrino interactions. Two building blocks will be sparsely con fi gured to fully explore the IceCube signal with similar instrumented volume, different methodology, improved resolution and complementary fi eld of view, including the galactic plane. One building block will be densely con fi gured to precisely measure atmospheric neutrino oscillations. Original content from this work may be used under the ter

The CLAS12 Forward Tagger

This document presents the technical layout and the performance of the CLAS12 Forward Tagger (FT). The FT, composed of an electromagnetic calorimeter based on PbWO4 crystals (FT-Cal), a scintillation hodoscope (FT-Hodo), and several layers of Micromegas trackers (FT-Trk), has been designed to detect electrons and photons scattered at polar angles from 2∘ to 5∘ and to meet the physics goals of the hadron spectroscopy program and other experiments running with the CLAS12 spectrometer in Hall B

Net aboveground primary production and biomass dynamics of Schoenoplectus californicus (Cyperaceae) marshes growing under different hydrological conditions

We studied different functional attributes on two Schoenoplectus californicus (C. A. Mey) Sójak marshes that appear as very similar communities in terms of structure and dominant species, although they are settled on opposite ends along a fluvial-tidal gradient in the Lower Delta of the Paraná River. Obtained results showed a significantly higher net aboveground primary production (NAPP) in the marsh directly affected by tides (1999.41 ± 211.97 g m-2 year-1). In the upstream site, less prone to tidal flooding, S. californicus had a lower NAPP (1299.17 ± 179.48 g m-2 year-1) and the system showed a higher ability to keep the produced biomass within the marsh, with significantly higher amounts of standing dead biomass (1316.00 ± 336.01 vs. 112.40 ± 55.05 g m-2), as well as higher organic contents in soils (16.20 ± 0.12 % vs. 0.70 ± 0.08 %). Results of the present study suggest that high energy overland flows may change the marsh functioning from a stable system accumulating organic matter to an aggressively growing marsh with higher rates of mineral accumulation.Fil:Pratolongo, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Kandus, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina