987 resultados para TONGUE FLICK


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The cold upwelling 'tongue' of the eastern equatorial Pacific is a central energetic feature of the ocean, dominating both the mean state and temporal variability of climate in the tropics and beyond. Recent evidence for the development of the modern cold tongue during the Pliocene-Pleistocene transition has been explained as the result of extratropical cooling that drove a shoaling of the thermocline. We have found that the sub-Antarctic and sub-Arctic regions underwent substantial cooling nearly synchronous to the cold tongue development, thereby providing support for this hypothesis. In addition, we show that sub-Antarctic climate changed in its response to Earth's orbital variations, from a subtropical to a subpolar pattern, as expected if cooling shrank the warm-water sphere of the ocean and thus contracted the subtropical gyres.

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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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Facsimile reprint of edition London, 1567.

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T.-p. reads: ... A shorte introdvction of grammar generally to be vsed: compiled and set forth, for the bringing vp of all those that intende to attaine the knowledge of the Latine tongue. 1567.

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National Highway Traffic Safety Administration, Washington, D.C.

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Mode of access: Internet.

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Mode of access: Internet.

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Federal Highway Administration, Bureau of Motor Carrier Safety, Washington, D.C.

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"Notes on the bushman, by E. and D. Bleek" : p. [36]-44.

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Town and country.--Also a garden.--A wet day.--The lion and the unicorn.--Our common tongue.--Woman.--Marriage and divorce.--John Bull.--The game-players.--Over the fire.--Appearances.--A gentleman and a soldier.--Facetiousness.--The man of the world.--A friend to stay.--Selfishness and other virtues.

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"This little sheaf of childish memories has been put together from many talks, in her own tongue, with an old French friend."