397 resultados para 1241
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The work in this sub-project of ESOP focuses on the advective and convective transforma-tion of water masses in the Greenland Sea and its neighbouring areas. It includes observational work on the sub-mesoscale and analysis of hydrographic data up to the gyre-scale. Observations of active convective plumes were made with a towed chain equipped with up to 80 CTD sensors, giving a horizontal and vertical resolution of the hydrographic fields of a few metres. The observed scales of the penetrative convective plumes compare well with those given by theory. On the mesoscale the structure of homogeneous eddies formed as a result of deep convection was observed and the associated mixing and renewal of the intermediate layers quantified. The relative importance and efficiency of thermal and haline penetrative convection in relation to the surface boundary conditions (heat and salt fluxes and ice cover) and the ambient stratification are studied using the multi year time series of hydro-graphic data in the central Greenland Sea. The modification of the water column of the Greenland Sea gyre through advection from and mixing with water at its rim is assessed on longer time scales. The relative contributions are quantified using modern water mass analysis methods based on inverse techniques. Likewise the convective renewal and the spreading of the Arctic Intermediate Water from its formation area is quantified. The aim is to budget the heat and salt content of the water column, in particular of the low salinity surface layer, and to relate its seasonal and interannual variability to the lateral fluxes and the fluxes at the air-sea-ice interface. This will allow to estimate residence times for the different layers of the Greenland Sea gyre, a quantity important for the description of the Polar Ocean carbon cycle.
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The shoaling and final closure of the Central American Seaway (CAS) resulted in a major change of the global ocean circulation and has been suggested as an essential driver for strengthening of Atlantic Meridional Overturning Circulation (AMOC). The exact timing of CAS closure is key to interpreting its importance. Here we present a reconstruction of deep and intermediate water Nd and Pb isotope compositions obtained from fossil fish teeth and the authigenic coatings of planktonic foraminifera in the eastern equatorial Pacific (Ocean Drilling Program (ODP) Site 1241) and the Caribbean (ODP Sites 998, 999, and 1000) covering the final stages of CAS closure between 5.6 and 2.2 Ma. The data for the Pacific site indicate no significant Atlantic/Caribbean influence over this entire period. The Caribbean sites show a continuous trend to less radiogenic Nd isotope compositions during the Pliocene, consistent with an enhancement of Upper North Atlantic Deep Water (UNADW) inflow and a strengthening of the AMOC. Superimposed onto this long-term trend, shorter-term changes of intermediate Caribbean Nd isotope signatures approached more UNADW-like values during intervals when published reconstructions of seawater salinity suggested complete closure of the CAS. The data imply that significant deep water exchange with the Pacific essentially stopped by 7 Ma and that shallow exchange, which still occurred at least periodically until approximately 2.5 Ma, may have been linked to the strength of the AMOC but did not have any direct effect on the intermediate and deep Caribbean Nd isotope signatures through mixing with Pacific waters.
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[Vol. 1] 1926, and 1st suppl., 1923, "Fourth printing"; 2d suppl., 1923; 3d suppl., 1926.
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Mode of access: Internet.
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Mode of access: Internet.
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Contiene: Regulae Juris Caninici per varias quaestiones & casus, ex ipsis Regularum visceribus resolutos explicatae / ab ... Annone Schonorremberg ..., 128, [4] p., con portadilla y sign. propias.
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Mode of access: Internet.
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Contiene: Vol. 1: Tomus primus, pars prima (1843. XX, 457 p.) -- Vol. 2: Tomus primus, pars altera (1844. X, 491 p.) -- Vol. 3: Tomus secundus, pars prima (1844. VII, 525 p.) -- Vol. 4: Tomus secundus, pars altera (1844. VIII, 587 p.) -- Vol. 5: Tomus tertius, pars prima (1844. VII, 536 p.) -- Vol. 6: Tomus tertius, pars secunda (1844. IX, 734 p.) -- Vol. 7: Tomus tertius, pars tertia (1844. IX, 864 p.) -- Vol. 8: Tomus quartus, pars prima (1844. VII, 570 p.) -- Vol. 9: Tomus quartus, pars secunda (1845. VIII, 541 p.) -- Vol. 10: Tomus quintus, pars prima (1845. IX, 871 p.) -- Vol. 11: Tomus quintus, pars secunda (1845. VIII, 572 p.) -- Vol. 12: Ad jus ecclesiasticum universum indices universi primus titulorum alter rerum secundum ordinem decretalium postremus verborum (1845. 958 p.)
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Mode of access: Internet.
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CCBE S. XVI,
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ICCU,
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On t.-p. of vol. IX: ... Imprimendum curavit Eberhardus Richtsteig.
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Mode of access: Internet.