1,318 research outputs found
Enhanced carbon dioxide outgassing from the eastern equatorial Atlantic during the last glacial
No full textBiological productivity and carbon export in the equatorial Atlantic are thought to have been dramatically higher during the last glacial period than during the Holocene. Here we reconstruct the pH and CO2 content of surface waters from the eastern equatorial Atlantic Ocean over the past ?30 k.y. using the boron isotope composition of Globigerinoides ruber (a mixed-layer–dwelling planktic foraminifera). Our new record, combined with previously published data, indicates that during the last glacial, in contrast to today, a strong west to east gradient existed in the extent of air:sea equilibrium with respect to pCO2 (?pCO2), with the eastern equatorial Atlantic acting as a significant source of CO2 (+100 ?atm) while the western Atlantic remained close to equilibrium (+25 ?atm). This pattern suggests that a fivefold increase in the upwelling rate of deeper waters drove increased Atlantic productivity and large-scale regional cooling during the last glacial, but the higher than modern ?pCO2 in the east indicates that export production did not keep up with enhanced upwelling of nutrients. However, the downstream decline of ?pCO2 provides evidence that the unused nutrients from the east were eventually used for biologic carbon export, thereby effectively negating the impact of changes in upwelling on atmospheric CO2 levels. Our findings indicate that the equatorial Atlantic exerted a minimal role in contributing to lower glacial-age atmospheric CO2
Elefanti, serpenti e bachi da seta : riflessioni su qualche aspetto del repertorio zoologico ambrosiano
No full textThe author studies some aspects of the christianization of ancient zoological knowledg
Leo gallum et maxime album veretur. Tracce della dottrina delle simpatie e antipatie naturali nell’"Exameron" di Ambrogio
No full textThe author argues that Ambrose possibly knew of pseudo-Democritus' work
Ambrose’s letters: sermones absentium?
No full textThe author investigates some linguistic features of Ambrose's letters, in order to demonstrate their (apparent) low degree of literarity
Osservazioni sulla lingua dell'epistolario ambrosiano
No full textThe author deals with word order in verbal phrases, as a possible clue of orality in Ambrose' letters
Sativus e insitivus: due tecnicismi in Ambrogio?
No full textThe author focuses on some lexical aspects of the language of the works of Ambrose of Mila
Linguistic otherness in Jerome's epistolary praises of holy women
No full textPraises of holy women in Jerome's letters show deep appreciation of their alleged culture and multilingualism. The author deals with the (classical) origin and (Christian) meaning of that theme
Cicero in Ambrose’s De officiis and letters
No full textThe author examines the phenomenon of 'competing exempla' in Ambrose's De officis and in his model, as such a survey might shed light on the expected audience/readership of the Ambrosian treatise
Di nuovo sulla fortuna di un termine “agricolo”: seminarium
No full textThe author studies the presence of agriculture technical language in some works of Ambrose of Mila
Ut leo, sic formica vocor sermone Pelasgo : some observations about the ancient ant-lion (myrmex, myrmecoleon)
No full textThe Author deals with the story of the ant-lion. This animal, born because of a translation mistake in the Greek Bible, survived in the tradition of Greek and Latin Physiologus and in later bestiaries, undergoing a strange metamorphosis: mermecolion in fact became the name of the pearl-oyster
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