Data/hora: 19/06/2024 03:29:00

Biblioteca(s): | Embrapa Semiárido; Embrapa Unidades Centrais.
Data corrente: | 09/07/1996
Data da última atualização: | 07/10/2003
Autoria: | REDDY, S. J.
Título: | Climatic fluctuations and homogenization of northeast Brazil using precipitation data.
Ano de publicação: | 1984
Fonte/Imprenta: | Pesquisa Agropecuaria Brasileira, Brasilia, v.19, n.5, p. 529-543, maio 1984.
Idioma: | Inglês
Conteúdo: | In order to assess the cyclic variations in the precipitation series and to homogenize the precipitation regimes of the Northeast Brazil 70-years annual precipitation data of 105-locations were subjected to power spectrum analysis. In terms of some cycles the regions above and below 8oS lat. differ significantly. Also regions between 4-8oS lat. are different in some respects from regions above 4oS lat. This is true with respect to coefficient of variation of annual precipitation. The agreement in general is good with few exceptions. the some predicted curve is also used to compare with the observed precipitation auto-regression of Fortaleza data of 1849 to 1981 revealed the presence of four cycles, namely 52, 26, 13 and 6.5 years. The integrated curve of these four cycles is compared with the observed precipitation. The agreemetn in general is good with few exceptions. The some predicted curve is also used to compare with the observed precipitation at few other locations. The agreement is good only for feew regions coefficient of variation of annual precipitation presented a non-homogenity over regions above 8oS lat. compared to regions below 8oS lat. This is also true even with the observed cycles. This type of discrepancy is attributed to the non-homogeneity in the data series, which is also substantiated with few examples. This study demonstrates that the basic precipitation data must be corrected for homogeneity before they are actually used in the agricultural productivity estimates or planning strategies using regression approach.
Palavras-Chave: | Ciclos; Climatic; Cycles; Flutuacao; Nordeste; Northeast; Poder de espectro; Power; Precipitação; Precipitacao pluviometrica; Recursos naturais; Regime; Spectrum.
Thesagro: | Análise; Clima; Homogeneização.
Thesaurus Nal: | climate; homogenization.

Categoria do assunto:

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P Recursos Naturais, Ciências Ambientais e da Terra

URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/143577/1/7902-1.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)

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