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A continuous ice-core 10Be record from Mongolian mid-latitudes: Influences of solar variability and local climate.

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Title: A continuous ice-core 10Be record from Mongolian mid-latitudes: Influences of solar variability and local climate.
Authors: Inceoglu, F.1,2 fadil@phys.au.dk, Knudsen, M.F.2, Olsen, J.3, Karoff, C.1,2, Herren, P.-A.4,5, Schwikowski, M.4,5, Aldahan, A.6,7, Possnert, G.8
Source: Earth & Planetary Science Letters. Mar2016, Vol. 437, p47-56. 10p.
Subjects: Solar oscillations, Cosmogenic nuclides, Climatology, Cyclones
Geographic Terms: Altai Mountains
Abstract: High-resolution 10 Be records used for studies of detailed changes in atmospheric 10 Be production rates predominantly derive from polar ice cores. In this study, we present the first 10 Be record from a mid-latitude ice core. The ice core derives from the Tsambagarav mountain range located in the Mongolian Altai region. The new 10 Be concentration record spans the period from AD 1550 to 2009, while the flux record extends from AD 1816 to 2009. The 10 Be concentration in the Tsambagarav ice core ranges between ∼ 1.5 × 10 4 and ∼ 10 × 10 4 atoms g − 1 , whereas the 10 Be flux changes from ∼0.02 to ∼0.15 atoms cm −2  s −1 . The average 10 Be flux at Tsambagarav is four times higher than the average 10 Be flux recorded in the NGRIP and Dome Fuji ice cores, which is in accordance with model predictions. In general, the long-term trends observed in the Tsambagarav 10 Be concentration and flux records are reasonably similar to those observed in the NGRIP ice core. A comparison between the Tsambagarav 10 Be record, group sunspot numbers (GSNs), and solar modulation potentials based on 14 C in tree rings suggests that the Maunder Minimum was associated with a prolonged maximum in 10 Be concentrations at Tsambagarav, whereas the Dalton Minimum was associated with a minor increase in the 10 Be concentration and flux that was delayed relative to the primary minimum in GSNs. The sulphate record from Tsambagarav shows that large positive anomalies in the sulphate concentration are associated with negative anomalies in the 10 Be concentration. A concurrent positive sulphate anomaly may explain why the main phase of the Dalton Minimum is subdued in the 10 Be record from Tsambagarav. Spectral analysis indicates that the 11-yr solar-cycle signal may have influenced the new 10 Be record, but the evidence supporting a direct link is ambiguous. Local and regional climatic changes, such as cyclonic versus anticyclonic conditions and related storm tracks, most likely played a significant role for the 10 Be deposition in the Tsambagarav region. [ABSTRACT FROM AUTHOR]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A continuous ice-core 10Be record from Mongolian mid-latitudes: Influences of solar variability and local climate.
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  Data: <searchLink fieldCode="AR" term="%22Inceoglu%2C+F%2E%22">Inceoglu, F.</searchLink><relatesTo>1,2</relatesTo><i> fadil@phys.au.dk</i><br /><searchLink fieldCode="AR" term="%22Knudsen%2C+M%2EF%2E%22">Knudsen, M.F.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Olsen%2C+J%2E%22">Olsen, J.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Karoff%2C+C%2E%22">Karoff, C.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Herren%2C+P%2E-A%2E%22">Herren, P.-A.</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Schwikowski%2C+M%2E%22">Schwikowski, M.</searchLink><relatesTo>4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Aldahan%2C+A%2E%22">Aldahan, A.</searchLink><relatesTo>6,7</relatesTo><br /><searchLink fieldCode="AR" term="%22Possnert%2C+G%2E%22">Possnert, G.</searchLink><relatesTo>8</relatesTo>
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  Data: High-resolution 10 Be records used for studies of detailed changes in atmospheric 10 Be production rates predominantly derive from polar ice cores. In this study, we present the first 10 Be record from a mid-latitude ice core. The ice core derives from the Tsambagarav mountain range located in the Mongolian Altai region. The new 10 Be concentration record spans the period from AD 1550 to 2009, while the flux record extends from AD 1816 to 2009. The 10 Be concentration in the Tsambagarav ice core ranges between ∼ 1.5 × 10 4 and ∼ 10 × 10 4 atoms g − 1 , whereas the 10 Be flux changes from ∼0.02 to ∼0.15 atoms cm −2  s −1 . The average 10 Be flux at Tsambagarav is four times higher than the average 10 Be flux recorded in the NGRIP and Dome Fuji ice cores, which is in accordance with model predictions. In general, the long-term trends observed in the Tsambagarav 10 Be concentration and flux records are reasonably similar to those observed in the NGRIP ice core. A comparison between the Tsambagarav 10 Be record, group sunspot numbers (GSNs), and solar modulation potentials based on 14 C in tree rings suggests that the Maunder Minimum was associated with a prolonged maximum in 10 Be concentrations at Tsambagarav, whereas the Dalton Minimum was associated with a minor increase in the 10 Be concentration and flux that was delayed relative to the primary minimum in GSNs. The sulphate record from Tsambagarav shows that large positive anomalies in the sulphate concentration are associated with negative anomalies in the 10 Be concentration. A concurrent positive sulphate anomaly may explain why the main phase of the Dalton Minimum is subdued in the 10 Be record from Tsambagarav. Spectral analysis indicates that the 11-yr solar-cycle signal may have influenced the new 10 Be record, but the evidence supporting a direct link is ambiguous. Local and regional climatic changes, such as cyclonic versus anticyclonic conditions and related storm tracks, most likely played a significant role for the 10 Be deposition in the Tsambagarav region. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.epsl.2016.01.006
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        Text: English
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      – SubjectFull: Solar oscillations
        Type: general
      – SubjectFull: Cosmogenic nuclides
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      – SubjectFull: Climatology
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      – SubjectFull: Cyclones
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