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Registro Completo |
Biblioteca(s): |
Embrapa Semiárido; Embrapa Unidades Centrais. |
Data corrente: |
09/07/1996 |
Data da última atualização: |
07/10/2003 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
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. MenosIn 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 productiv... Mostrar Tudo |
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: |
-- P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/143577/1/7902-1.pdf
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Marc: |
LEADER 02443naa a2200337 a 4500 001 1104728 005 2003-10-07 008 1984 bl uuuu u00u1 u #d 100 1 $aREDDY, S. J. 245 $aClimatic fluctuations and homogenization of northeast Brazil using precipitation data. 260 $c1984 520 $aIn 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. 650 $aclimate 650 $ahomogenization 650 $aAnálise 650 $aClima 650 $aHomogeneização 653 $aCiclos 653 $aClimatic 653 $aCycles 653 $aFlutuacao 653 $aNordeste 653 $aNortheast 653 $aPoder de espectro 653 $aPower 653 $aPrecipitação 653 $aPrecipitacao pluviometrica 653 $aRecursos naturais 653 $aRegime 653 $aSpectrum 773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.19, n.5, p. 529-543, maio 1984.
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Embrapa Unidades Centrais (AI-SEDE) |
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11. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | REDDY, S. J. Irrigation scheduling using ICSWAB model. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 18, n. 9, p. 1121-1126, out. 1983.Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - B |
Biblioteca(s): Embrapa Semiárido; Embrapa Unidades Centrais. |
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