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Your search keyword '"Grimalt, J. O."' showing total 6 results
Start Over Author "Grimalt, J. O." Language spanish; castilian
6 results on '"Grimalt, J. O."'

1. Reconstrucción de las temperaturas superficiales marinas delmargen ibérico sudoriental durante el último periodo glacial mediante el empleo de cocolitofóridos

Author

Colmenero Hidalgo, Elena, Flores, José Abel, Sierro, Francisco Javier, and Grimalt, J. O.

Subjects
Short-term climatic variability, Western Mediterranean, Pleistocene, Coccolithophores, Iberian Margin, Emiliania huxleyi, Eastern North Atlantic
Abstract

Detailed quantitative analyses of coccolithophore assemblages have been carried out in three sediment cores recovered from different locations in the Atlantic and Mediterranean sectors of the Iberian Peninsula. Biostratigraphical and oxygen isotope analyses show that these cores provide a high-resolution record of most of the last glacial period. Joint interpretation of the results reveals that higher sea surface temperatures (SST) were recorded in the Atlantic side during that interval. Dansgaard-Oeschger Interstadials are the warmer periods, while during Heinrich Events and Dansgaard-Oeschger Stadials SSTs suffered a substantial decrease, probably due to the appearance of turbid, fresher and colder surface water masses. These quantitative differences in the response of coccolithophore assemblages between the Atlantic and the Mediterranean cores indicate that the Mediterranean Sea shows a more intense response to climatic and oceanographic changes than the Atlantic area

Published
2005

2. Sea surface temperature reconstruction in the southeastern Iberian Margin during the Last Glacial period by means of coccolithophore analyses

Author

Colmenero Hidalgo, Elena, Flores, José Abel, Sierro, Francisco Javier, and Grimalt, J. O.

Subjects
Short-term climatic variability, Western Mediterranean, Pleistocene, Coccolithophores, Iberian Margin, Emiliania huxleyi, Eastern North Atlantic
Abstract

Detailed quantitative analyses of coccolithophore assemblages have been carried out in three sediment cores recovered from different locations in the Atlantic and Mediterranean sectors of the Iberian Peninsula. Biostratigraphical and oxygen isotope analyses show that these cores provide a high-resolution record of most of the last glacial period. Joint interpretation of the results reveals that higher sea surface temperatures (SST) were recorded in the Atlantic side during that interval. Dansgaard-Oeschger Interstadials are the warmer periods, while during Heinrich Events and Dansgaard-Oeschger Stadials SSTs suffered a substantial decrease, probably due to the appearance of turbid, fresher and colder surface water masses. These quantitative differences in the response of coccolithophore assemblages between the Atlantic and the Mediterranean cores indicate that the Mediterranean Sea shows a more intense response to climatic and oceanographic changes than the Atlantic area

Published
2005

3. Dinámica superficial en la Ría de Vigo durante los últimos 3000 años puesta de manifiesto a través de los cocolitofóridos y biomarcadores

Author

Álvarez, M. C., Flores, José Abel, Sierro, Francisco Javier, Diz, P., Francés, Guillermo, Pelejero, C., and Grimalt, J. O.

Subjects
Ria de Vigo, NAO (North Atlantic Oscillation), Surgencia, Biomarcadores moleculares, Cocolitofóridos
Abstract

We identified three coccolithophores assemblages in core VIR-18, in the Ría de Vigo. We will use these assemblages together with other biogeochemical data to make paleoenvironmental interpretations about this area and thus determine fluctuations between marine and continental influences over the last 3000 years

Published
2002

4. [Changes in concentrations of organochloride compounds in women from Flix, Tarragona [Spain]].

Author

Ribas-Fitó N, Sunyer J, Sala M, and Grimalt JO

Subjects
Adolescent, Adult, Female, Humans, Spain, Dichlorodiphenyldichloroethane blood, Hexachlorobenzene blood, Hexachlorocyclohexane blood
Abstract

The population of Flix (region of Ribera del Ebro, Tarragona) is highly exposed to hexachlorobenzene (HCB) due to the closeness of an electrochemical factory. Although the degree of HCB contamination in this population is still high, concentrations of HCB in the sera of women aged 18-40 years from 1997 to 1999 were 61% lower than those observed in 1994 (4.1 ng/ml vs. 10.6 ng/ml). Concentrations of dichlorodiphenyl dichloroethane (p,p'-DDE) and beta-hexachlorocyclohexane (beta-HCH) also decreased, although the difference was not statistically significant. In contrast, concentrations of polychlorinated biphenyls (PCB) in the period 1997-1999 showed a nonsignificant increase compared with those in 1994.

Published
2003
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5. [Drinking water chlorination and adverse health effects: review of epidemiological studies].

Author

Villanueva CM, Kogevinas M, and Grimalt JO

Subjects
Colonic Neoplasms epidemiology, Female, Humans, Male, Pancreatic Neoplasms chemically induced, Pancreatic Neoplasms epidemiology, Pregnancy, Prenatal Exposure Delayed Effects, Rectal Neoplasms epidemiology, Urinary Bladder Neoplasms epidemiology, Water Pollutants, Chemical analysis, Chlorides adverse effects, Colonic Neoplasms chemically induced, Rectal Neoplasms chemically induced, Urinary Bladder Neoplasms chemically induced, Water Purification methods
Published
2001
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6. [Chlorination of drinking water in Spain and bladder cancer].

Author

Villanueva CM, Kogevinas M, and Grimalt JO

Subjects
Humans, Risk Assessment, Spain epidemiology, Drinking Water analysis, Halogenation, Trihalomethanes adverse effects, Trihalomethanes analysis, Urinary Bladder Neoplasms chemically induced, Urinary Bladder Neoplasms epidemiology
Abstract

Objectives: Drinking water chlorination generates trihalomethanes and other by-products with mutagenic and carcinogenic properties in animal experiments. Epidemiological studies have associated trihalomethanes to an increased risk of bladder cancer. We evaluate trihalomethane levels in four Spanish areas and calculate the bladder cancer risk attributable to this exposure., Methods: Trihalomethanes have been analysed in 111 drinking water samples from four Spanish areas using gas chromatography. Water utilities were contacted and information on drinking water consumption in Spain has been collected. We reviewed the epidemiological studies that assess the association between bladder cancer risk and exposure to chlorination by-products. Attributable risk was calculated on the basis of these levels, mortality data per area and risk estimates obtained from the literature., Results: Mediterranean areas present the highest levels of trihalomethanes with 81, 80, 61 and 52 µg/l in Sabadell, Alicante, Barcelona and Manresa respectively. Lower levels are found in Tenerife and Asturias with 7 and 20 µg/l respectively. The bladder cancer attributable risk in high trihalomethane exposure areas may be, on average, around 20%., Conclusions: The trihalomethane levels found are high compared to those of other European Union countries. In the high exposure areas, drinking water chlorination may generate a considerable number of bladder cancer cases. These estimations have to be carefully interpreted and verified with more extensive studies.

Published
2001
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