PRECIPITATION IN THE CENTRAL AMAZON BASIN: - THE ISOTOPIC COMPOSITION OF RAIN AND ATMOSPHERIC MOISTURE AT BELÉM AND MANAUS

Matsui, E.; Salati, E.; Ribeiro, M. N. G.; Reis, C. M.; Tancredi, A. C. S. N. F.; Gat, J. R.

doi:10.1590/1809-43921983132307

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ECOLOGIA • Acta Amaz. 13 (2) • Apr 1983 • https://doi.org/10.1590/1809-43921983132307 copy

PRECIPITATION IN THE CENTRAL AMAZON BASIN: - THE ISOTOPIC COMPOSITION OF RAIN AND ATMOSPHERIC MOISTURE AT BELÉM AND MANAUS ⁽¹⁾ 1 Research supported by: International Atomic Energy Agency (IAEA); Conselho Nacional de Pesquisas e Desenvolvimento (CNPq); Financiadora de Estudos e Projetos (FINEP) Secretaria de Ciência e Tecnologia do Estado de São Paulo e Comissão Nacional de Energia Nuclear (CNEN). The authors are also in debted to Therezinha Xavier Bastos and Tatiana Deane de Abreu Sá Diniz (EMBRAPA-Belém, by her help in sample collection at Belém.

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SUMMARY

In order to improve the understanding of the water in the Amazon Basin, samples of rain and moisture were collected daily at Belém and Manaus from August 78 to January 80. All isotope data are presented. The most depleted values, sometimes lower than — 10‰ in δ¹⁸O at Belém or Manaus, were encountered during the rainy season (January-April).

Possible causes of the seasonal differences in tne isotope pattern are discussed.

Instituto Nacional de Pesquisas da Amazônia Av. André Araujo, 2936 Aleixo, 69060-001 Manaus AM Brasil, Tel.: +55 92 3643-3030, Fax: +55 92 643-3223 - Manaus - AM - Brazil
E-mail: acta@inpa.gov.br

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Research supported by: International Atomic Energy Agency (IAEA); Conselho Nacional de Pesquisas e Desenvolvimento (CNPq); Financiadora de Estudos e Projetos (FINEP) Secretaria de Ciência e Tecnologia do Estado de São Paulo e Comissão Nacional de Energia Nuclear (CNEN). The authors are also in debted to Therezinha Xavier Bastos and Tatiana Deane de Abreu Sá Diniz (EMBRAPA-Belém, by her help in sample collection at Belém.