9 documents found, page 1 of 1

Emissões de gases com efeito de estufa: o lado negro das belas lagoas dos Açores

Nas últimas décadas têm vindo a ser observados níveis crescentes de dióxido de carbono (CO2) e metano (CH4) na atmosfera, muito acima dos valores pré-industriais, resultantes de emissões provenientes de fontes como, entre outras, a combustão de combustíveis fósseis, a desflorestação, as práticas agrícolas ou processos industriais.

Hydrochemical and isotopic composition (87Sr/86Sr) of rainwater from São Miguel...

Rain chemistry has been the subject of extensive research over the last few decades in order to determine the geochemical mechanisms that control the water composition (e.g., Négrel et al., 2007). In the present work rain samples were collected at Furnas and Fogo volcanoes, located in São Miguel (Fig.1a), in order to characterize the chemical fingerprint of the rainwaters and to investigate a possible interacti...

Implementation of the Water Framework Directive in an outermost EU region : the...

The Azores Water Plan (AWP) came to force in year 2003 in order to provide a coherent set of measures to protect and enhance water resources in the archipelago. The AWP was developed according to EU Water Framework Directive (WFD) and a close relationship can be found between goals on both documents. The evaluation of results associated to AWP implementation, made possible through a consultation procedure descr...

Bacterial diversity and geochemical profiles in sediments from eutrophic Azorea...

In Azores, the advanced trophic state of the lakes requires a fast intervention to achieve the good ecological status prescribed by the Water Framework Directive. Despite the considerable effort made to describe the phytoplankton growing on the water column, the lack of information regarding the microbial processes in sediments is still high. Thus, for the successful implementation of internal management action...

Eutrophication-threatened aquatic ecosystems : sediment biogeochemical processe...

Prospective scenarios for water quality and ecological status in Lake Sete Cida...

The design of alternative strategies for water and ecological quality protection at the Lake Verde of Sete Cidades should be coupled with the assessment of future trophic states. Therefore, a mathematical model was developed to make prospective scenarios to reduce the risk of environmental degradation of the lake, and a modified Psenner scheme was used to characterize P distribution in the sediments. The model ...

Phosphorus fractionation in volcanic lake sediments (Azores – Portugal)

The phosphorus distribution in volcanic sediments of three lakes that are under different anthropogenic pressures in São Miguel island (Azores – Portugal) was evaluated using a sequential extraction scheme. The P-fractionation scheme employs sequential extractions of sediment with NH4Cl, bicarbonate-dithionite (BD), NaOH (at room temperature), HCl and NaOH (at 85 °C) to obtain five P-fractions. The P-fractionat...

Relatório de Acompanhamento do Plano Regional da Água

Contribuição da hidrogeologia para o planeamento e a gestão sustentável da água...

A água subterrânea constitui um recurso de importância estratégica vital nos Açores, o que resulta do seu significado ambiental e do valor sócio-económico e cultural intrínseco. No entanto, no passado, o desenvolvimento deste recurso foi frequentemente realizado sem atender à complexidade e à vulnerabilidade dos sistemas aquíferos. A hidrogeologia dos Açores denota as características peculiares dos meios vulcân...