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| Leal,Fábio Tiraboschi; França,Ana Beatriz Coelho; Siqueira,Diego Silva; Teixeira,Daniel De Bortoli; Marques Júnior,José; Scala Júnior,Newton La. |
| ABSTRACTSoil CO2 emissions (fCO2) in agricultural areas have been widely studied in global climate change research, but its characterization and quantification are restricted to small areas. Because spatial and time variability affect emissions, tools need to be developed to predict fCO2 for large areas. This study aimed to investigate soil magnetic susceptibility (MS) and its correlation with fCO2 in an agricultural environment. The experiment was carried out on a Typic Eutrudox located in Guariba-SP, Brazil. Results showed that there was negative spatial correlation between fCO2 and the magnetic susceptibility of Air Dried Soil (MSADS) up to 34.3 m distant. However, the fCO2 had no significant correlation with MSADS, magnetic susceptibility of sand... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Magnetism; Soil respiration; Spatial variability; Geostatistics. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600535 |
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| Szitkar, Florent. |
| Detailed submarine exploration shows a diversity of hydrothermal sites in terms of geology, minerals, fluids and biology. High0resolution, near0seafloor magnetic surveys have been undertaken on various basalt0hosted or ultramafic0hosted hydrothermal sites using a vector magnetometer mounted on deep0sea submersible Nautile, remotely operated vehicle (ROV) Victor, and autonomous underwater vehicle (AUV) AsterX of Ifremer. These surveys reveal different magnetic signatures, depending the characteristics of the hydrothermal sites. (1) Basalt-hosted sites are characterized by a negative (reduced to the pole) anomaly indicating a reduced magnetization. Two processes are often considered to explain this observation: thermal demagnetization or alteration of the... |
| Tipo: Text |
Palavras-chave: Roches ultramafiques; Processus hydrothermaux; Magnétisme; Magnetism; Ultamafic Rocks; Hydrothermal Processes. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00690/80179/83259.pdf |
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