801 resultados para 846


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Significant uncertainties persist in the reconstruction of past sea surface temperatures in the eastern equatorial Pacific, especially regarding the amplitude of the glacial cooling and the details of the post-glacial warming. Here we present the first regional calibration of alkenone unsaturation in surface sediments versus mean annual sea surface temperatures (maSST). Based on 81 new and 48 previously published data points, it is shown that open ocean samples conform to established global regressions of Uk'37 versus maSST and that there is no systematic bias from seasonality in the production or export of alkenones, or from surface ocean nutrient concentrations or salinity. The flattening of the regression at the highest maSSTs is found to be statistically insignificant. For the near-coastal Peru upwelling zone between 11-15°S and 76-79°W, however, we corroborate earlier observations that Uk'37 SST estimates significantly over-estimate maSSTs at many sites. We posit that this is caused either by uncertainties in the determination of maSSTs in this highly dynamic environment, or by biasing of the alkenone paleothermometer toward El Niño events as postulated by Rein et al. (2005).

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Each part also published separately, 1915 and 1916 respectively.

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Mode of access: Internet.

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Contiene: T.I (XIX, 944 p., [13] h. de lam.) -- T.II ( 846 p., [12] h. de lam.) -- T.III (1017 p., [12] h. de lam.) -- T.IV (982 p., [12] h. de lam.) -- T.V (1206 p., [12] h. de lam.) -- T.VI (1104 p., [12] h. de lam.)

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Includes Arabic text and added t.p.: al-Kitab al-mukhtasar fl hisāb al-jabr wa-al-muqābalah.

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Photocopy. [Ithaca, N.Y. : Cornell University, Photoduplication Service, 1979].

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Catalog is in three parts: (1) Bibliotheca Grenvilliana; or, Bibliographical notices of rare and curious books, forming part of the library of the Right Hon. Thomas Grenville: by John Thomas Payne and Henry Foss ... London, Printed by W. Nicol, 1842. 2 v. 24 cm. Paged continuously; v. 1: 3 p. ℓ., [3]-6, [2], xxxiii, 388 p.; v. 2: 2 p. ℓ., [389]-846 p. (2) Bibliotheca Grenvilliana; part the second, completing the catalogue of the library bequeathed to the British museum by the late Right Hon. Thomas Grenville. By John Thomas Payne and Henry Foss. London, Printed by order of the Trustees, 1848. 2 p. ℓ., [3]-4, [2], 472, xlii p. 24 cm. The first 56 pages were printed in 1843. (3) Bibliotheca Grenvilliana; part the third, completing the catalogue of the library bequeathed to the British museum by the late Right Hon. Thomas Grenville. With a general index. London, Printed by order of the Trustees, 1872. 6, [2], 219 p. front. (port.) 27 cm. By W. B. Rye.

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Mode of access: Internet.

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Mode of access: Internet.