By A S Alsharhan; Zayed International Prize for the Environment (Organization)
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Additional info for Desertification in the third millennium : proceedings of an international conference, Dubai, 12-15 February 2000
7573684. A band-pass filter passes only frequencies in a narrow band from fpass (fp) to fstop (fs) (Burt and Barber, 1996). The ideal band pass filter has a response of zero for all frequencies below fp and above fs. Bandpass filters were designed to obtain the wavetrains of major cycles detected by the spectral analysis. , Lisse, The Netherlands (5) where fp is the pass frequency, and fs is the stop frequency (Hamming, 1989). In a band-pass design, Ck equals ϪCϪk and C0 equals 0. In this research a 2m ϩ 1 (m ϭ 29) band pass filter system, with 59-term filters, was employed on the stalagmite layer thickness, rainfall and SO data series to obtain wavetrains of significant periodicities revealed by spectral analysis.
Correlations between stalagmite annual layer thickness and climate-station and average rainfall are listed in Table 1. 62). -W. A. B. C. THILL Figure 6 Bivariate regression relationships between the climate and stalagmite variables. g. 62 (Fig. 6c, d), but less well with rainfall at more distant stations. 20). The generally low r values between layer thickness and rainfall are almost certainly due to the marked spatial variability in Botswana rainfall in any year, so that rainfall at Drotsky’s Cave may be very Stalagmite Annual Layer Thickness as a Proxy for Enso and Rainfall: Evidence from Drotsky’s Cave, Botswana Table 1 Correlations between station and average rainfall in Botswana, Stalagmite annual layer thickness, and the southern oscillation.
UNCOD recognised both human impact and climatic variation as contributing causes of desertification, but saw drought – usually a short-term climate fluctuation – as more of a catalyst than a primary cause. UNCOD was originally convened in response to the Sahel drought that killed up to 250,000 people in the early 1970s, but its organising secretariat decided on the basis of extensive research that drought had merely accelerated a long term process of land degradation caused by human overuse, and so placed desertification on the world’s environmental agenda.