Measuring and interpreting CO2 fluxes at regional scale: the case of the Apennines, Italy

Tectonically active regions are often characterized by large amounts of carbon dioxide degassing, and estimation of the total CO2 discharged to the atmosphere from tectonic structures, hydrothermal systems and inactive volcanic areas is crucial for the definition of present-day global Earth degassing. The carbon balance of regional aquifers is a powerful tool to quantify the diffuse degassing of deep inorganic carbon sources because the method integrates the CO2 flux over large areas. Its application to peninsular Italy shows that the region is characterized by specific CO2 fluxes higher than the baseline determined for the geothermal regions of the world, and that the amount of endogenous CO2 discharged through diffuse regional degassing (c. 2.1 × 1011 mol a−1) is the major component of the geological CO2 budget of Italy, definitely prevailing over the CO2 discharged by Italian active volcanoes and volcanoes with hydrothermal activity. Furthermore, the positive correlation between geothermal heat and deep CO2 dissolved in the groundwater of central Italy suggests that (1) the geothermal heat is transported into the aquifers by the same hot CO2-rich fluids causing the Italian CO2 anomaly and (2) the advective heat flow is the dominant form of heat transfer of the region. Supplementary material: The location, flow rate, extent of the hydrogeological basin, chemical and isotopic analyses of the 160 springs considered in this study, and the results of the carbon mass balance are reported in a table available at https://doi.org/10.6084/m9.figshare.c.423702

Chemical weathering and consumption of atmospheric carbon dioxide in the Alpine region

To determine the CO2 consumption due to chemical weathering in the Alps, water samples from the 32 main Alpine rivers were collected and analysed in two periods, spring 2011 and winter 2011/2012. Most of the river waters are characterized by a bicarbonate earth-alkaline composition with some samples showing a clear enrich-ment in sulphates and other samples showing a slight enrichment in alkaline metals. The amount of total dissolved solids (TDS) ranges between 96 and 551 mg/L. Considering the major ion composition and the Sr isotopic composition of water samples, coherently with the geological setting of the study area, three major reservoirs of dissolved load have been recognized: carbonates, evaporites and silicates. Based on a chemical mass balance, the flux of dissolved solids, and the flux of carbon dioxide consumed by chemical weathering have been computed for each basin and for the entire study area. Results show that the flux of dissolved solids, ranges from 8 × 103 to 411 × 103 kg km−2 y−1, with an average value of 127 × 103 kg km−2 y−1, while the flux of carbon dioxide consumed by chemical weathering in the short-term (b1 Ma) is 5.03 × 105 mol km−2 y−1 1 on average. Since part of the CO2 is returned to the atmosphere through carbonate precipitation and reverse weathering once river water reaches the ocean, the CO2 removed from the atmosphere/soil system in the long-term (N1 Ma) is much smaller than the CO2 consumed in the short-term and according to our calculations amounts to 2.01 × 104 mol km−2 y−1 on average. This value is almost certainly a minimum estimate of the total amount of CO2 fixed by weathering on the long-term because in our calculations we assumed that all the alkaline metals deriving from rock weathering in the continents are rapidly involved in the process of reverse weathering in the oceans, while there are still large uncertainties on the magnitude and significance of this process. The values of CO2 flux consumed by weathering are strongly correlated with runoff while other potential controlling factors show only weak correlations or no correlation. Our estimation of the CO2 consumed by weathering in the Alpine basins is in the same order of magnitude, but higher than the world average and is consistent with previ-ous estimations made in river basins with similar climatic conditions and similar latitudes

Discharge variations of springs induced by strong earthquakes: the case of the mw 6.5 Norcia event (Italy, October 30 th 2016)

Earthquakes, dynamic strain, groundwater circulation, structural permeability

Older people with hip fracture and IADL disability require earlier surgery

Background: Hip fractures represent a major challenge for physicians as well as society as a whole. Both poor functional status and delay to surgery are well known risk factors for negative outcomes. We hypothesized that the timing of the operation is more important for frail older people than older people without functional limitations before fracture. Methods: We performed a prospective multicenter cohort study on 806 consecutive patients, 75 years of age or older, admitted with a fragility hip fracture to three hospitals in the Emilia-Romagna Region (Italy). All three hospitals had a comanaged care model, and the patients were under the shared responsibility of an orthopedic surgeon and a geriatrician. Results: Functional status assessed as instrumental activities of daily living was an important predictor of survival after 1 year from fracture. After adjusting for confounders, the hazard ratios per 1 point score of increase from 0 to 8 was 1.30 (95% confidence interval 1.19-1.42, p =. 000). Time to surgery increased 1-year mortality in patients with a low instrumental activities of daily living score (hazard ratios per day of surgical delay 1.14, 95% confidence interval 1.06-1.22, p <. 001) and intermediate instrumental activities of daily living score (hazard ratios 1.21, 95% confidence interval 1.09-1.34, p <. 001) but was an insignificant risk factor in functionally independent patients (hazard ratios 1.05 95% confidence interval 0.79-1.41, p =. 706). Conclusions: Surgery delay is an independent factor for mortality in older patients after hip fracture but only for the frail older people with prefracture functional impairment. If our results are confirmed, a more intensive approach should be adopted for older people with hip fractures who have disabilities. © 2012 The Author

Comprehensive care of elderly patients with hip fracture: the orthogeriatric model

Introduction: Hip fractures in the elderly are a major source of morbidity and mortality. Interdisciplinary hospital care models proposed for the treatment of these patients include consultant teams, integrated orthopedic-geriatric care, and comprehensive geriatric-led care settings. A prospective interventional cohort study was conducted in 4 public hospitals in the Emilia-Romagna Region of Italy to compare the outcomes of these different care models. This report presents the preliminary results obtained with an orthogeriatric model in one of these centers, a large teaching hospital in Bologna. Materials and methods: Beginning in February 2008, all patients older than 75 years admitted to the University of Bologna’s Sant’Orsola-Malpighi Hospital for hip fractures were cared for in an orthogeriatric unit. The unit consisted of 10 beds in the orthopedic ward that were managed by a geriatric specialist and a multidisciplinary team, which met daily and included an orthopedic surgeon, a physiatrist, a nurse case-manager, staff nurses, a physical therapist, and a social worker. The management protocol included a thorough geriatric work-up to identify comorbidities and risk factors, systematic assessment and prevention of pain and acute disorientation, early verticalization and moblization, postacute rehabilitation therapy, family support, and regular follow-up after discharge. Preliminary results were compared with those achieved in the same orthopedic ward prior to the creation of the Orthogeriatric Unit. Results: During 2008, 226 elderly patients (mean age 86.2 + 5.5 years), 73.4% of whom were women, were admitted to the Orthogeriatric Unit for hip fractures. The mean Charlson comorbidity index of this cohort was 3.0 + 1.8). Half the patients had Activity of Daily Living scores < 4, and cognitive impairment was common (mean score on Short Portable Mental Status Questionnaire: 5.9 + 3.2). Compared with figures obtained in the hospital’s orthopedic ward prior to 2008, in-hospital mortality dropped from 5.98% to 3.98%. The mean overall length of hospitalization was not significantly reduced, but the mean stay in the Orthogeriatric unit decreased by almost 2 days (to 10.46 days from 12.44 days in the traditional orthopedic unit). Discussion: Compared with traditional care models, the orthogeriatric model may allow better integration of the health-care resources available for the management of hip fractures in the elderly, and this improvement may have positive effects on the outcome of these cases

Triponzo: a thermal system in a cold area of the Apennines (Italy)

Bagni di Triponzo thermal springs, characterised by a Ca-SO4 composition and temperatures up to 30°C, are located in the eastern sector of Umbria region in the Umbria-Marche Apennine (central Italy). The region is characterised by a low geothermal gradient and low conductive heat flux and the composition of Triponzo thermal waters significantly differs with respect to the cold waters circulating in the surrounding areas. The origin of the heat transported by the waters of the Triponzo springs is mainly due to a deep component, characterised by high CO2 and He contents, coming from a deeper reservoir, rising along normal faults and mixing with infiltrating waters of meteoric origin. The total amount of thermal water discharged by the system is about 34 L s-1. According to the ternary SO4-2-F--HCO3- geoindicator for carbonate-evaporite reservoirs, the fluids at reservoir condition are charcterised by a partial pressure of CO2 about 0.5 bar and a temperature between 70-75°C whereas the Silica geothermometers give a temperature about 62°C. The computed thermal energy transported by advection and discharged at the surface by Triponzo springs is about 3.71×1011 ± 0.56×1011 J/day.Published62-721TR. Georisorse2TR. Ricostruzione e modellazione della struttura crostaleJCR Journa

Measuring and interpreting CO2 fluxes at regional scale: the case of the Apennines, Italy

Tectonically active regions are often characterized by large amounts of carbon dioxide degassing, and estimation of the total CO2 discharged to the atmosphere from tectonic structures, hydrothermal systems and inactive volcanic areas is crucial for the definition of present-day global Earth degassing. The carbon balance of regional aquifers is a powerful tool to quantify the diffuse degassing of deep inorganic carbon sources because the method integrates the CO2 flux over large areas. Its application to peninsular Italy shows that the region is characterized by specific CO2 fluxes higher than the baseline determined for the geothermal regions of the world, and that the amount of endogenous CO2 discharged through diffuse regional degassing (c. 2.1 × 1011 mol a−1) is the major component of the geological CO2 budget of Italy, definitely prevailing over the CO2 discharged by Italian active volcanoes and volcanoes with hydrothermal activity. Furthermore, the positive correlation between geothermal heat and deep CO2 dissolved in the groundwater of central Italy suggests that (1) the geothermal heat is transported into the aquifers by the same hot CO2-rich fluids causing the Italian CO2 anomaly and (2) the advective heat flow is the dominant form of heat transfer of the region.Published408–4161TR. GeorisorseJCR Journa

The Carbon Dioxide Emission as Indicator of the Geothermal Heat Flow: Review of Local and Regional Applications with a Special Focus on Italy

We review the methods based on the measurement of CO2 emissions for the computation of geothermal heat flow, both at a local (hydrothermal sites, a few km2) and regional scale (hundreds km2). At the local scale, we present and discuss the cases of the Latera caldera and Torre Alfina (Italy) geothermal systems. At Torre Alfina and Latera, the convection process sustains a CO2 emission of ~1 kg s–1 and ~4 kg s–1, and heat flows of 46 MW and 130 MW, respectively. At the regional scale, we discuss the case of the central Apennine (Italy), where CO2 mass and enthalpy balances of regional aquifers highlights a wide and strong thermal anomaly in an area of low conductive heat flow. Notably, the CO2/heat ratios computed for the central Apennines are very similar to those of the nearby geothermal systems of Latium and Tuscany, suggesting a common source of CO2‐rich fluids ascribed to the Tyrrhenian mantle.ISSN:1996-107

An Endorheic Lake in a Changing Climate: Geochemical Investigations at Lake Trasimeno (Italy)

Lake Trasimeno is a shallow, endorheic lake located in central Italy. It is the fourth Italian largest lake and is one of the largest endorheic basins in western Europe. Because of its shallow depth and the absence of natural outflows, the lake, in historical times, alternated from periods of floods to strong decreases of the water level during periods of prolonged drought. Lake water is characterised by a NaCl composition and relatively high salinity. The geochemical and isotopic monitoring of lake water from 2006 to 2018 shows the presence of well-defined seasonal trends, strictly correlated to precipitation regime and evaporation. These trends are clearly highlighted by the isotopic composition of lake water (δ18O and δD) and by the variations of dissolved mobile species. In the long term, a progressive warming of lake water and a strong increase of total dissolved inorganic solids have been observed, indicating Lake Trasimeno as a paradigmatic example of how climate change can cause large variations of water quality and quantity. Furthermore, the rate of variation of lake water temperature is very close to the rate of variation of land-surface air temperature, LSAT, suggesting that shallow endorheic lakes can be used as a proxy for global warming measurements.PublishedID 13196A. Geochimica per l'ambiente e geologia medicaJCR Journa