The Relevance of Manganese in the Ocean for the Climatic Cycles in the Quaternary : Vorgelegt in der Sitzung vom 18. November 1989

Augusto Mangini

ISBN 10: 3540523642 / ISBN 13: 9783540523642

Editore: Springer, Springer, 1990

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Druck auf Anfrage Neuware - Printed after ordering - It is widely accepted that there is a relationship between ice volume and the solar insolation in summer in the northern hemisphere. The Earth's glacial cycles are driven by cyclic changes in the Earth's orbital elements. This conclusion is based on the strong coherence between the approx. 20000 and 40000 year spectral components of ice volume and insolation (Milankovitch-curve) records. These frequencies are determined by the variation of the obliquity of the Earth's axis and by its position relative to the Earth's orbit around the sun. The degree of sum mer insolation on the Earth's northern Hemisphere is believed to be relevant to climate because the North Atlantic is where cold saline water is being formed. Present day deep water circulation is driven by salt build-up in due to net evapora tion. In contrast, in the North Pacific precipitation exceeds evaporation. Thus, deep water transfers a surplus of salt from the N. Atlantic to the North Pacific. This surface water delivers also oxygen to the deep ocean. In contrast, upwelling deep water transfers nutrients from the deep ocean to the surface water. Today the time of renewal of deep water is in the order of 1000 years.

Codice articolo 9783540523642

Dati bibliografici

• Titolo: The Relevance of Manganese in the Ocean for the Climatic Cycles in the Quaternary : Vorgelegt in der Sitzung vom 18. November 1989
• Editore: Springer, Springer
• Data di pubblicazione: 1990
• Lingua: Inglese
• ISBN 10: 3540523642
• ISBN 13: 9783540523642
• Rilegatura: Taschenbuch
• Condizione: Neu
• Dimensioni: 244 L x 170 A x 3 P (millimetri) 244 millimetri di larghezza per 170 millimetri di altezza per 3 millimetri di profondità
• Peso: 76 grammi

Descrizione articolo

Riassunto

It is widely accepted that there is a relationship between ice volume and the solar insolation in summer in the northern hemisphere. The Earth's glacial cycles are driven by cyclic changes in the Earth's orbital elements. This conclusion is based on the strong coherence between the approx. 20000 and 40000 year spectral components of ice volume and insolation (Milankovitch-curve) records. These frequencies are determined by the variation of the obliquity of the Earth's axis and by its position relative to the Earth's orbit around the sun. The degree of sum­ mer insolation on the Earth's northern Hemisphere is believed to be relevant to climate because the North Atlantic is where cold saline water is being formed. Present day deep water circulation is driven by salt build-up in due to net evapora­ tion. In contrast, in the North Pacific precipitation exceeds evaporation. Thus, deep water transfers a surplus of salt from the N. Atlantic to the North Pacific. This surface water delivers also oxygen to the deep ocean. In contrast, upwelling deep water transfers nutrients from the deep ocean to the surface water. Today the time of renewal of deep water is in the order of 1000 years.

Contenuti

1. The Carbonate Cycle.- 2. The Present-Day Oxygen Balance in the Ocean.- 3. The Behaviour of Mn in the Ocean.- 4. The Impact of Mn on the CO2 System.- Preliminary Testing of the Model.- a) Mn-Crusts.- b) Sediments from High Latitudes.- c) Sediments from the Central Pacific.- Conclusions.- References.