http://hdl.handle.net/2122/133 Search the Channel search http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/5998 Title: Installazione di un mini-sistema DAQ con idrofono su fondale marino in acque basse<br/><br/>Authors: Guardato, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Orazi, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Caputo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Buonocunto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia Thu, 01 Apr 2010 00:00:00 GMT http://hdl.handle.net/2122/5842 Title: Marine climate change and environmental indicators from the Marine Core Service<br/><br/>Authors: Coppini, Giovanni; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Lyubartsev, Vladyslav; Centro EuroMediterraneo per i Cambiamenti Climatici; Pinardi, Nadia; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Fratianni, Claudia; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Tonani, Marina; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Adani, Mario; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Oddo, Paolo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Dobricic, Srdjan; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Marullo, Salvatore; ENEA; Loewe, Peter; BSH; Santoleri, Rosalia; CNR-ISAC; Colella, Simone; CNR-ISAC; Volpe, Gianluca; CNR-ISAC<br/><br/>Editors: ENVIROINFO<br/><br/>Abstract: In the framework of the Mediterranean Operational Oceanography Network (MOON, http://www.moon-oceanforecasting.eu) The Mediterranean Forecasting System (Pinardi et al., 2003) has started the design and development of services that include the routine production of environmental and climate indicators. A process of identifying user requirements has been started in collaboration with European Environment Agency and the indicators definition and implementation aim to take user requirements into account. The indicators are extensively used by EEA (EEA web page on indicators: http://themes.eea.europa.eu/indicators/). INGV has carried out an analysis on the possible improvements of existing indicators in use by EEA and on the development of new indicators based on Marine Core Services (MCS) products. The list of indicators includes: Temperature, Chlorophyll-a (from ocean colour), Ocean Currents and Transport, Salinity, Transparency, Sea Level, Sea Ice and Density. A critical analysis has been carried out to identify the relevance of the above-mentioned indicators for EU policies, their spatial and temporal coverage, their accuracy and their availability (Coppini et al., 2008). INGV in collaboration with CNR-ISAC are directly involved on the development of the indicators in the Mediterranean region and European Seas region the Temperature and Chlorophyll-a (Chl-a) products are the most suitable for an indicator development test phase. In particular the OO Chl-a product, deduced from satellite data, is able to contribute to the further development of the EEA Chl-a indicator on eutrohpication that is based on in-situ measurements (CSI023). For this indicator a development phase has been undertaken in 2008 and 2009 within the European Topic Center for Water (ETC-W) for EEA. The temperature indicators, developed with the support of MyOcean and Operational Oceanography community, consist of long time series (1870-Today) of SST anomaly able to describe ocean temperature increase due to climate change in the European Seas and on SST trends map of the last 25 years for the European Seas. These last two indicators have been included in the last 2008 EEA report on Impacts of Climate change in the European Seas (http://www.eea.europa.eu/publications/eea_report_2008_4). Moreover MFS re-analysis have been produced for the Mediterranean Sea and it consists of daily output of MFS-OPA hydrodinamic model (1/16 of degree horizontal resolution) that assimilates all available in situ and satellite observation for 1985 to 2007. This reanalysis product is used to detect temperature anomalies over the last 20 years in the coastal zone that could be related with environmental stresses. In addition to that we have also identified a Density indicator that appears relevant for the ecosystem health assessment in the coastal waters. Wed, 09 Sep 2009 00:00:00 GMT http://hdl.handle.net/2122/5383 Title: Il contributo dei pozzi perforati dalla Regione Lombardia alla conoscenza del Pleistocene lombardo<br/><br/>Authors: Scardia, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Muttoni, G.; Università di Milano<br/><br/>Abstract: Facies analysis applied to several up to 220-m-deep cores, taken by Regione Lombardia in the central-northern Po Plain, allowed to recognize an overall regressive sequence consisting of cyclotemic shallow marine and fluvial-deltaic deposits overlain by distal to proximal braidplain sediments. Magnetostratigraphy, coupled with calcareous nannoplankton biostratigraphy, was used to date marine and fluvial-deltaic sediments to the early Pleistocene and continental sediments to the middle–late Pleistocene. Sediment accumulation rates were of ~0.3-0.4 mm/yr in the early Pleistocene, whereas an overall reduction in sediment accumulation rates to ~0.06-0.08 mm/yr, associated to relevant unconformities, characterized the middle-late Pleistocene.Stratigraphic evidences from petrographic, sedimentologic and palynologic analyses highlight in the Regione Lombardia cores a drastic reorganization of vegetational, fluvial, and Alpine drainage patterns, associated to a sequence boundary termed the “R surface”. The “R surface”, seismically traceable across the Po Plain subsurface, was constrained magnetostratigraphically to the first prominent Pleistocene glacio-eustatic lowstand of marine isotope stage (MIS) 22 at 0.87 Ma at the end of the Mid-Pleistocene Revolution, when climate worsened globally and locally caused the onset of the first major Pleistocene glaciation in the Alps.Most marine deposits in the cores lie above sea level highstands of corresponding age, suggesting that they have been uplifted. In order to estimate the observed rock uplift, sediments were back-stripped to elevations at times of deposition (expressed in meters above current sea level) by applying a simple Airy compensation model. The correlation of the isostatically corrected sedimentary facies to a glacio-eustatic reference curve obtained from classic oxygen isotope studies highlights a positive elevation mismatch (rock uplift) in the range of 70-120 m, which occurred after the onset of the major Pleistocene glacial-interglacial cycles at rates of at least 0.15-0.09 mm/yr. Although the driving forces of the observed rock uplift cannot be unambiguously identified, but its timing of onset after the beginning of the major Pleistocene glacial-interglacial cycles and the low seismicity observed in the most of the Regione Lombardia area seem to point to an isostatic readjustment of the chain probably due to the long-term erosional removal of sediments during major Pleistocene glacial advances. Thu, 01 Jan 2009 00:00:00 GMT http://hdl.handle.net/2122/5382 Title: Late Matuyama climate forcing on sedimentation at the margin of the southern Alps (Italy)<br/><br/>Authors: Scardia, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Donegana, M.; CNR-IDPA; Muttoni, G.; Università di Milano; Ravazzi, C.; CNR-IDPA; Vezzoli, G.; Università di Milano-Bicocca<br/><br/>Abstract: The Pleistocene history of climate control on sedimentation in the Southern Alps-Po Plain system, northern Italy, was reconstructed using an integrated magnetostratigraphic, palynological, and petrographical approach on a 47-m-deep core. The core mainly consists of lacustrine sediments pertaining to the Bagaggera sequence, deposited at the foothills of the Southern Alps during the late Matuyama subchron (0.99–0.78 Ma). At that time, climate worsened globally and locally it caused the progradation of an alluvial fan unit onto the nearby Po Plain, triggering lake formation by damming of a tributary valley. These new data are used in conjunction with data from the literature to highlight and track the effects of climate forcing on sedimentation during the late Matuyama subchron in different orographic and geodynamic settings of the Southern Alps-Po Plain system as part of the greater Alpine area. We found that the episodes of alluvial fan and braidplain progradation observed in the southern foreland of the Alps during the late Matuyama global cooling seem broadly synchronous with the deposition of most of the so-called Günz and Älterer Deckenschotter deposits in the northern forelands of the Alps as well as with the first major waxing of the Alpine valley glaciers, possibly around the Marine Isotope Stage 22 (~0.87 Ma). Thu, 01 Jan 2009 00:00:00 GMT http://hdl.handle.net/2122/4907 Title: Coupled Greenhouse Warming and Deep Sea Acidification in the Middle Eocene<br/><br/>Authors: Bohaty, S. M.; School of Ocean and Earth Science, National Oceanography Centre, Southampton, UK; Zachos, J. C.; University of California, Santa Cruz, USA; Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Delaney, M. L.; University of California, Santa Cruz, USA<br/><br/>Abstract: The Middle Eocene Climatic Optimum (MECO) is an enigmatic warming event that represents an abrupt reversal in long-term cooling through the Eocene. In order to further assess the timing and nature of this event, we have assembled stable isotope and calcium carbonate concentration records from multiple Deep Sea Drilling Project and Ocean Drilling Program sites for the time interval between ~43 and 38 Ma. Revised stratigraphy at several sites and compilation of δ18O records place peak warming during the MECO event at 40.0 Ma (Chron C18n.2n). The identification of the δ18O excursion at sites in different geographic regions indicates that the climatic effects of this event were globally extensive. The total duration of the MECO event is estimated at ~500 kyr, with peak warming lasting <100 kyr. Assuming minimal glaciation in the late middle Eocene, ~4 to 6ºC total warming of both surface and deep waters is estimated during the MECO at the study sites. Maximum warming at ~40.0 Ma also coincided with a world-wide decline in carbonate accumulation at sites below 3000 m depth, reflecting a temporary shoaling of the calcite compensation depth. The synchroneity of deep-water acidification and globally extensive warming makes a persuasive argument that the MECO event was linked to a transient increase in atmospheric pCO2. The results of this study confirm previous reports of significant climatic instability during the middle Eocene. Furthermore, the direct link between warming and changes in the carbonate chemistry of the deep ocean provides strong evidence that changes in greenhouse gas concentrations exerted a primary control on short-term climate variability during this critical period of Eocene climate evolution. Thu, 01 Jan 2009 00:00:00 GMT http://hdl.handle.net/2122/4005 Title: Isotopic composition of single rain events in the central Mediterranean<br/><br/>Authors: Liotta, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; Bellissimo, S.; Dipartimento di Chimica e Fisica della Terra, Universita` degli Studi di Palermo; Favara, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia; Valenza, M.; Dipartimento di Chimica e Fisica della Terra, Universita` degli Studi di Palermo<br/><br/>Abstract: The ratios of stable isotopes of single rain events were investigated during the period October 2005 to September 2006 in the central Mediterranean. Clear seasonal trends were identified in both oxygen isotope ratios and the deuterium-excess parameter, and these were ascribed to the dominant circulation systems during both cold and hot intraannual periods. Rain events were classified on the basis of the origin of rain-bearing systems. Air masses coming from the south usually give rise to rainwater with a low deuterium excess. Air masses coming from the north and the northeast are often dry and cold, and are associated with high evaporation from the Mediterranean Sea that occurs under isotopic nonequilibrium conditions. Kinetic fractionation enhances lighter isotopomers in the vapor phase, increasing the deuterium excess. During cold periods large vapor fluxes from the Mediterranean Sea, as estimated by the ECMWF (European Centre for Medium-Range Weather Forecasts), usually precede rain events with a high deuterium excess. However, the isotope signatures of the Mediterranean moisture contribution may be masked by the original isotope content of the circulating air masses and/or by secondary evaporation effects. Wed, 20 Aug 2008 00:00:00 GMT http://hdl.handle.net/2122/3847 Title: Sedimentation and aspects of glacial dynamics from physical properties, mineralogy and magnetic properties at ODP Sites 1166 and 1167, Prydz Bay, Antarctica<br/><br/>Authors: Forsberg, C. F.; Norwegian Geotechnical Institute, P.O. Box 3930 Ullevaal Stadion, N-0806 Oslo, Norway; Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Grützner, J.; University of Bremen,; Venuti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Solheim, A.; Norwegian Geotechnical Institute, P.O. Box 3930 Ullevaal Stadion, N-0806 Oslo, Norway<br/><br/>Abstract: Trough mouth fans are formed by aggradation of glacial debris flows from sediment deposited by fast flowing ice streams extending to the shelf edge. We here present investigations at two sites, ODP Site 1166 on the shelf and ODP Site 1167 drilled on the Prydz Channel Fan in order to contribute to the understanding of Neogene ice flow patterns in Prydz Bay. The mineralogy, wt.% > 63 μm, physical and magnetic properties were analyzed. The mineralogy of Neogene strata at Site 1166 can be correlated to nearby ODP Site 742 drilled during Leg 119. Moreover an increase in the shear strength of the sediments (Leg 119 load event 3) is found both at Site 1166 and Site 742. This load event probably indicates that the oldest glacial configuration involved thicker glaciers than the later ones. The results from Site 1167 show that there has been a significant change in the provenance of the sediments during the past 2 million years. The greatest change occurred at about 1.13 Ma and implies a shift in the glacial configuration in Prydz Bay with a greater contribution of material from western parts of the drainage basin during the deposition of Unit II (> 1.13 Ma; 217–435 mbsf) at Site 1167 on the Prydz Channel Fan. Tue, 01 Jan 2008 00:00:00 GMT http://hdl.handle.net/2122/3093 Title: A Record of Antarctic Climate and Ice Sheet History Recovered<br/><br/>Authors: Naish, T.; Antarctic Research Centre, Victoria University of Wellington, New Zealand, and Geological and Nuclear Sciences, Lower Hutt, New Zealand; Powell, R.; Department of Geology and Environmental Geosciences, Northern Illinois University, DeKalb; Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Harwood, D.; ANDRILL Science Management Office; Kuhn, G.; Department of Marine Geophysics, Alfred Wegener Institute, Bremerhaven, Germany; Niessen, F.; Department of Marine Geophysics, Alfred Wegener Institute, Bremerhaven, Germany; Talarico, F.; Dipartimento di Scienze delle Terra,Università di Siena, Siena, Italy; Wilson, G.; Department of Geology, University of Otago, Dunedin, New Zealand<br/><br/>Abstract: Antarctica’s late Cenozoic (the past ~15 millionyears) climate history is poorly knownfrom direct evidence, owing to its remoteness,an extensive sea ice apron, and an icesheet cover over the region for the past 34million years. Consequently, knowledgeabout the role of Antarctica’s ice sheets inglobal sea level and climate has relied heavilyupon interpretations of oxygen isotope recordsfrom deep-sea cores. Whereas these isotopicrecords have revolutionized our understandingof climate-ice-ocean interactions,questions still remain about the specificrole of Antarctic ice sheets in global climate.Such questions can be addressedfrom geological records at the marine marginof the ice sheets, recovered by drillingfrom floating ice platforms [e.g., Davey et al.,2001; Harwood et al., 2006; Barrett, 2007]. Mon, 01 Jan 2007 00:00:00 GMT http://hdl.handle.net/2122/2527 Title: Isotopic composition of meteoric water in Sicily<br/><br/>Authors: Liotta, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia<br/><br/>Abstract: The isotopic composition of meteoric water in Sicily (Italy,) was investigated from May 2004 until Jun 2006; a rain gauge network (50 sites) was installed and sampled monthly. During this same period most of the circulating groundwater in the investigated area was sampled from more than 560 springs and wells related to the main aquifers. The mean weighted precipitation values were used to define the weighted local meteoric water line (WLMWL) for several sectors of Sicily. The use of GIS tools, coupled with isotopic vertical gradients, allowed us to design an isotopic contour map of precipitation in Sicily. The defined meteoric compositions fitted well with most of the groundwater samples for each sector. However, in some areas fractionation processes occurring during and after rainfall, slightly modified the isotopic composition of the groundwater<br/><br/>Description: Poster Thu, 20 Sep 2007 12:50:08 GMT http://hdl.handle.net/2122/2186 Title: The middle Eocene climatic optimum (MECO) event in the<br/><br/>Authors: Jovane, L.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy; Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy; Coccioni, R.; Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”,; Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143, Rome, Italy; Marsili, A.; Istituto di Geologia e Centro di Geobiologia, Università degli Studi di Urbino “Carlo Bo”,; Monechi, S.; Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, 50121,; Roberts, A.; National Oceanography Centre, Southampton, University of Southampton, European Way,; Sprovieri, M.; Istituto Ambiente Marino Costiero (CNR), Calata Porta di Massa (Interno Porto di Napoli),<br/><br/>Abstract: We report a high-resolution paleomagnetic investigation constrained by new qualitativeand semi-quantitative analyses of planktic and benthic foraminifera, nannofossil assemblages,integrated with oxygen and carbon isotope measurements, for the middle Eocene Scaglia limestonesof the Contessa Highway section, central Italy. Calcareous plankton assemblages enablesrecognition of several biostratigraphic events from planktic foraminiferal Zone P11 to the lowerpart of Zone P15 and from calcareous nannofossil Zone NP15 to the upper part of Zone NP17,which results in refinement of the magnetobiostratigraphy of the Contessa Highway section.Correlation of the paleomagnetic polarity pattern with the geomagnetic polarity timescale providesa direct age interpretation for strata around the middle Eocene Scaglia limestones of the Contessa2Highway section, from Chrons C21n (47 Ma) through to Subchron C18n.1n (38.5 Ma). Bulk carbonisotope values indicate a distinct carbon isotopic shift at 40 Ma that is interpreted to represent thefirst evidence in the northern hemisphere of the middle Eocene climatic optimum that has recentlybeen observed as a stable isotope anomaly in multiple records from the Indian-Atlantic sector of theSouthern Ocean. This should demonstrate a global response of carbon cycle to the proposedtransient increased pCO2 levels during the late middle Eocene and a consequent global CO2-drivenclimate change. Sun, 01 Jan 2006 00:00:00 GMT