60 resultados para bicentennial


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Vol. for 1944-45 called also Bicentennial issue.

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Bicentennial oration of G. B. Loring: p. 279-298.

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Bicentennial project of the Texas Woman's University and Forest Service, U. S. Dept. of Agriculture."

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Mode of access: Internet.

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"This study is a part of the Commission's Bicentennial Program, and ... was conducted and written by Frederick Gutheim."

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Map on lining-papers.

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"A bicentennial series."

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"September 1990."

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Mode of access: Internet.

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Mode of access: Internet.

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The sea surface temperature (SST) of the tropical Indian Ocean is a major component of global climate teleconnections. While the Holocene SST history is documented for regions affected by the Indian and Arabian monsoons, data from the near-equatorial western Indian Ocean are sparse. Reconstructing past zonal and meridional SST gradients requires additional information on past temperatures from the western boundary current region. We present a unique record of Holocene SST and thermocline depth variations in the tropical western Indian Ocean as documented in foraminiferal Mg/Ca ratios and d18O from a sediment core off northern Tanzania. For Mg/Ca and thermocline d18O, most variance is concentrated in the centennial to bicentennial periodicity band. On the millennial time scale, an early to mid-Holocene (~7.8-5.6 ka) warm phase is followed by a temperature drop by up to 2°C, leading to a mid-Holocene cool interval (5.6-4.2 ka). The shift is accompanied by an initial reduction in the difference between surface and thermocline foraminiferal d18O, consistent with the thickening of the mixed layer and suggestions of a strengthened Walker circulation. However, we cannot confirm the expected enhanced zonal SST gradient, as the cooling of similar magnitude had previously been found in SSTs from the upwelling region off Sumatra and in Flores air temperatures. The SST pattern probably reflects the tropical Indian Ocean expression of a large-scale climate anomaly rather than a positive Indian Ocean Dipole-like mean state.

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Scale 1:80,000.

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Dissertação (mestrado)—Universidade de Brasília,Instituto de Ciências Humanas, Programa de Pós-Graduação em Filosofia, 2014.

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To recall and celebrate the positive contributions to our nation made by people of African descent, American historian Carter G. Woodson established Black History Week beginning on Feb. 12, 1926. In 1976, as part of the nation’s bicentennial, the week was expanded into Black History Month.