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  • 1
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    PANGAEA
    In:  Supplement to: Adkins, Jess F; deMenocal, Peter B; Eshel, Gidon (2006): The “African humid period” and the record of marine upwelling from excess 230Th in Ocean Drilling Program Hole 658C. Paleoceanography, 21(4), PA4203, https://doi.org/10.1029/2005PA001200
    Publication Date: 2024-01-09
    Description: Using a high-resolution 230Th normalized record of sediment flux, we document the deglacial and Holocene history of North African aridity and coastal upwelling at Ocean Drilling Program Hole 658C. At both the end of the Younger Dryas and after the 8.2 ka event, there are significant drops in terrigenous accumulation at our site, indicating an increase in the monsoon moisture flux over Africa at this time. At 5.5 ka, there is an abrupt end to the "African humid period" and a return to stronger upwelling conditions. For carbonate and opal fluxes the 230Th normalization completely changes the shape of each record based on percentage variations alone. This site is a clear example of how variations in one sediment component can obscure changes in the others, and it demonstrates the need for radionuclide measurements more generally in paleoceanography. By taking our new records and a large amount of previous data from this site we conclude that increases in African moisture are tightly coupled to decreases in coastal upwelling intensity.
    Keywords: 108-658C; AGE; Canarias Sea; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Inductively coupled plasma - mass spectrometry (ICP-MS); Joides Resolution; Leg108; Ocean Drilling Program; ODP; Thorium-230; Thorium-230, standard deviation; Thorium-230 excess; Thorium-230 excess, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 992 data points
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 370 (1994), S. 204-205 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Maize is by far Zimbabwe's most significant food source7. Figure 1 (solid lines) shows annual variations in Zimbabwe rain-fall and national average maize yield for the period 1970-93. Earlier data on the maize crop are unreliable. The annual aver-age rainfall is derived by summing monthly weighted ...
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2005. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Bulletin of the American Meteorological Society 86 (2005): 1733-1737, doi:10.1175/BAMS-86-12-1733.
    Description: A group of junior faculty members and UCAR junior scientists convened in Boulder, CO on June 16-18, 2003 for discussion on future scientific directions. This report summarizes the goals and products of one of the three foci selected for special consideration: predictability. About 15 people, representing physical, mathematical, and biological sciences, were present for round-table discussions. The discussion sought common interpretation of the predictability problem, points of generalization, identification of major hurdles, and potential approaches to their solution. The diverse background of the participants generated a wide-ranging discussion. The participants addressed predictability generally, while supplying specific examples from their own areas of expertise. Recurring themes included the relationship between models and initial conditions, the importance of definitions and the choice of a norm for evaluation, and generalization across systems and disciplines. The group explored potential avenues for generalization through interdisciplinary networking. Short- and long-range challenges were identified related to probabilistic state estimation, verifying predictions and understanding error, and dealing with nonlinearity. In this essay we expand on these themes and challenges, and describe possible future research objectives.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 68385 bytes
    Format: application/pdf
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