Stable hydrogen and carbon isotope records and concentration data for four long chain n-alkanes from core GIK16160-3 derived from the Zambezi delta in the Mozambique Channel during the last 37,000 years

Hydrogen isotope values (dD) of sedimentary terrestrial leaf wax such as n-alkanes or n-acids have been used to map and understand past changes in rainfall amount in the tropics because dD of precipitation is commonly assumed as the first order controlling factor of leaf wax dD. Plant functional types and their photosynthetic pathways can also affect leaf wax dD but these biological effects are rarely taken into account in paleo studies relying on this rainfall proxy. To investigate how biological effects may influence dD values we here present a 37,000-year old record of dD and stable carbon isotopes (d13C) measured on four n-alkanes (n-C27, n-C29, n-C31, n-C33) from a marine sediment core collected off the Zambezi River mouth. Our paleo d13C records suggest that each individual n-alkanes had different C3/C4 proportional contributions. n-C29 was mostly derived from a C3 dicots (trees, shrubs and forbs) dominant vegetation throughout the entire record. In contrast, the longer chain n-C33 and n-C31 were mostly contributed by C4 grasses during the Glacial period but shifted to a mixture of C4 grasses and C3 dicots during the Holocene. Strong correlations between dD and d13C values of n-C33 (correlation coefficient R2 = 0.75, n = 58) and n-C31 (R2 = 0.48, n = 58) suggest that their dD values were strongly influenced by changes in the relative contributions of C3/C4 plant types in contrast to n-C29 (R2 = 0.07, n = 58). Within regions with variable C3/C4 input, we conclude that dD values of n-C29 are the most reliable and unbiased indicator for past changes in rainfall, and that dD and d13C values of n-C31 and n-C33 are sensitive to C3/C4 vegetation changes. Our results demonstrate that a robust interpretation of palaeohydrological data using n-alkane dD requires additional knowledge of regional vegetation changes from which nalkanes are synthesized, and that the combination of dD and d13C values of multiple n-alkanes can help to differentiate biological effects from those related to the hydrological cycle.

(Table 1) Sea surface temperature reconstruction for eastern equatorial Pacific surface sediment samples

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).

Biografías sentimentales /

Mode of access: Internet.

Mazurka de concert : pour piano /

Mode of access: Internet.

Six pièces : pour harpe à pédales /

1. Matin sur l'eau -- 2. Scherzetto -- 3. En barque le soir -- 4. Ballade -- 5. Reflets dans l'eau -- 6. Fantaisie.

Chanson et Badinerie : [music] : pour flûte, avec accompagnement de piano /

Mode of access: Internet.

Tableaux de voyage : œuv. 33 : treize pièces pour le piano /

Mode of access: Internet.

Histoires : pour piano /

La meneuse de tortues d'or -- Le petit âne blamnc -- Le vieux mendiant -- a giddy girl -- Dans la maison triste -- Le palais abandonné -- Bajo la mesa -- La cage de cristal -- La marchande d'eau fraîche -- Le cortège de Balkis.

Recueil de gammes et arpèges mesurbes pour le basson /

v. 1. Gammes d'ut majeur à la ♯ mineur.- v. 2. Gammes de fa majeur à la ♭ mineur.

Trois pièces /

Originally for piano.

Principes de la science sociale /

Contiene: T. I (XX, 564 p.) -- T. II (509 p.) -- T. III (548 p.)

La vie des mineraux, la plasmogenèse et le biomecanisme universal,

Plates have half-title: Atlas de plasmogenèse et de biologie universelles publié par le dr. Jules Félix d'après les travaux et les microphotographics des professeurs et des sayants Butschli...A. Herrera...Leduc...etc.

Deuxième suite pour orgue, op. 27 /

Prélude pastoral -- Allegretto con moto -- Andantino -- Final-marché.