Chemical composition of precipitation at Marion Island (sub-Antarctic) |
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Institution: | 1. Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, Departamento de Solos e Recursos Ambientais, Caixa Postal: 1780, 18610-307 Botucatu, SP, Brazil;2. Mediterranean Ecogeomorphological and Hydrological Connectivity Research Team http://medhycon.uib.cat, Department of Geography, University of the Balearic Islands, Palma, E-07122 Mallorca, Balearic Islands, Spain;3. Instituto Florestal de São Paulo, Brazil;4. Universidad de Castilla-La Mancha, Campus Universitario s/n, C.P. 02071 Albacete, Spain |
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Abstract: | Over a 1-year period 16.40g Cl−m−2, 10.35 g Na m−2, 2.11 g SO4-S m−2, 1.24g Mg m−2, 0.39 g K m−2, 0.37 g Ca m−2 and 0.21 g inorganic N m−2 were deposited in precipitation 450 m inland on the eastern coastal plain of sub-Antarctic Marion Island (46°54′S, 37°45′E). Dissolved PO4-P and organic forms of N were not detected in the precipitation samples. Concentrations of Cl−, Na, Mg, Ca and K, as well as the total ionic concentration in the precipitation samples were significantly negatively correlated with the amount of precipitation. The ionic concentration order (Cl > Na > SO4-S > Mg > K ≈ Ca) in the precipitation was very similar to that in the surrounding ocean. It is likely that most of the inorganic N found in the precipitation originated in penguin rookeries on the nearby shore zone. A comparison is made between precipitation inputs of nutrients at the island and those at other subpolar sites in the S and N Hemispheres. |
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