Dynamics of the Laschamp geomagnetic excursion from Black Sea sediments

Nowaczyk, Norbert R; Arz, Helge Wolfgang; Frank, Ute; Kind, Jessica; Plessen, Birgit

doi:10.1016/j.epsl.2012.06.050

Cited by 164 publications

(225 citation statements)

References 110 publications

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“…Subsequently, fine tuning of the records of coastal ice-rafted detritus (IRD C ), carbonate content, Ca XRF counts, and the high-resolution magnetic susceptibility of core 25GC-1 to the GICC05 chronology of the North Greenland Ice Core Project (NGRIP) resulted in a final chronology with an average sampling resolution of about 230 years. The age model (Figure 1b) is discussed in greater detail in Nowaczyk et al [2012].…”

Section: Methodsmentioning

confidence: 99%

“…An initial age model was based on the absolutely dated Laschamp geomagnetic excursion (40.70 ± 0.95 ka), the Campanian Ignimbrite tephra (Y5; 39.28 ± 0.11 ka), and eight accelerator mass spectrometry radiocarbon dates [Nowaczyk et al, 2012]. Subsequently, fine tuning of the records of coastal ice-rafted detritus (IRD C ), carbonate content, Ca XRF counts, and the high-resolution magnetic susceptibility of core 25GC-1 to the GICC05 chronology of the North Greenland Ice Core Project (NGRIP) resulted in a final chronology with an average sampling resolution of about 230 years.…”

Section: Methodsmentioning

confidence: 99%

“…Red numbers and yellow bars denote the warm interstadials of DO cycles; HE denotes Heinrich events. (b) Age model of core 25GC-1 with absolute age control points and fine tuning using sedimentary parameters [Nowaczyk et al, 2012].…”

Section: 1002/2015gl065499mentioning

confidence: 99%

“…Total inorganic carbon (TIC) served as a proxy for phytoplankton productivity. Winter severity was inferred from the accumulation rate of coastal ice-rafted detritus (IRD C , modified [Nowaczyk et al, 2012]). The Eurasian ice volume is shown relative to present [Bintanja and van de Wal, 2008].…”

Section: 1002/2015gl065499mentioning

confidence: 99%

See 3 more Smart Citations

Black Sea temperature response to glacial millennial‐scale climate variability

Wegwerth

Ganopolski

Ménot

et al. 2015

Geophysical Research Letters

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The Eurasian inland propagation of temperature anomalies during glacial millennial‐scale climate variability is poorly understood, but this knowledge is crucial to understanding hemisphere‐wide atmospheric teleconnection patterns and climate mechanisms. Based on biomarkers and geochemical paleothermometers, a pronounced continental temperature variability between 64,000 and 20,000 years ago, coinciding with the Greenland Dansgaard‐Oeschger cycles, was determined in a well‐dated sediment record from the formerly enclosed Black Sea. Cooling during Heinrich events was not stronger than during other stadials in the Black Sea. This is corroborated by modeling results showing that regular Dansgaard‐Oeschger cycles penetrated deeper into the Eurasian continent than Heinrich events. The pattern of coastal ice‐rafted detritus suggests a strong dependence on the climate background state, with significantly milder winters during periods of reduced Eurasian ice sheets and an intensified meridional atmospheric circulation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: 1002/2015gl065499mentioning

confidence: 99%

Section: 1002/2015gl065499mentioning

confidence: 99%

See 2 more Smart Citations

Black Sea temperature response to glacial millennial‐scale climate variability

Wegwerth

Ganopolski

Ménot

et al. 2015

Geophysical Research Letters

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“…the main field, the lithospheric field, the external fields), but also of their interactions and impacts on our society. In the light of recent perception from palaeomagnetic records, indicating surprisingly fast magnetic field reversals (Nowaczyk et al, 2012), and in view of the fast evolution of the field revealed by CHAMP satellite data (Lesur et al, 2008), it is important to pursue data collection, which is foundation for global studies of core dynamics and coremantle interaction. The Swarm mission with three satellites, two flying side by side and one in a higher orbit, and its well-suited instrumentation, is able to contribute to this objective.…”

Section: Introductionmentioning

confidence: 99%

An algorithm for deriving core magnetic field models from the Swarm data set

2013

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In view of an optimal exploitation of the Swarm data set, we have prepared and tested software dedicated to the determination of accurate core magnetic field models and of the Euler angles between the magnetic sensors and the satellite reference frame. The dedicated core field model estimation is derived directly from the GFZ Reference Internal Magnetic Model (GRIMM) inversion and modeling family. The data selection techniques and the model parameterizations are similar to what were used for the derivation of the second (Lesur et al., 2010) and third versions of GRIMM, although the usage of observatory data is not planned in the framework of the application to Swarm. The regularization technique applied during the inversion process smoothes the magnetic field model in time. The algorithm to estimate the Euler angles is also derived from the CHAMP studies. The inversion scheme includes Euler angle determination with a quaternion representation for describing the rotations. It has been built to handle possible weak time variations of these angles. The modeling approach and software have been initially validated on a simple, noise-free, synthetic data set and on CHAMP vector magnetic field measurements. We present results of test runs applied to the synthetic Swarm test data set.

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Timing and lock‐in effect of the Laschamp geomagnetic excursion in Chinese Loess

Sun

Qiang

Liu

et al. 2013

Geochem Geophys Geosyst

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[1] The Laschamp geomagnetic excursion (LGE, at 41 ka) is a critical age control for hemispherical comparison of paleoclimate records from various kinds of geological archives (e.g., ice core, marine, and lake sediments). The timing of the LGE in Chinese Loess, however, remains poorly constrained due to the lack of a reliable chronology and the complex acquisition processes of natural remanent magnetization. Here, we systematically compare the paleomagnetic results of three optically stimulated luminescence dated loess sequences on the Chinese Loess Plateau. Our results indicate that the timing of the LGE in the northwestern Loess Plateau is slightly older than the absolute radiometric age determination and the timing inferred from Greenland ice core ( 10 Be flux) and marine (i.e., relative paleointensity and authogenic 10 Be/ 9 Be stack) records, but younger than the counterparts in the central Loess Plateau. We attribute the different timing of the LGE in the three loess sections to a progressive southeastward increase in the lock-in depth caused by the combined effects of postdepositional processes (e.g., surface mixing, chemical weathering, and lock-in delay) on the remanence acquisition process. We conclude that caution is needed to use the LGE in Chinese Loess as a reliable tie-event for highresolution chronological correlation to marine and ice core records, only if the potential lock-in effect can be precisely determined.

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Dynamics of the Laschamp geomagnetic excursion from Black Sea sediments

Cited by 164 publications

References 110 publications

Black Sea temperature response to glacial millennial‐scale climate variability

Black Sea temperature response to glacial millennial‐scale climate variability

An algorithm for deriving core magnetic field models from the Swarm data set

Timing and lock‐in effect of the Laschamp geomagnetic excursion in Chinese Loess

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