A paleoclimatic evaluation of marine oxygen isotope stage 11 in the high-northern Atlantic (Nordic seas)

Bauch, Henning A.; Erlenkeuser, Helmut; Helmke, Jan Peter; Struck, Ulrich

doi:10.1016/s0921-8181(99)00067-3

Cited by 70 publications

(58 citation statements)

References 44 publications

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“…According to modelling experiments, insolation impulse during Termination V was somewhat weak to drive glacial climate quickly towards full-interglacial conditions (Imbrie et al, 1993;Li et al, 1998). Additionally, European ice-sheet expansion was very large during MIS 12 (Donner, 1995), a fact which might help to explain not only the exceptional length of Termination V (Oppo et al, 1998;Bauch et al, 2000;Billups et al, 2004;Healey and Thunell, 2004;de Abreu et al, 2005) but also the difference in SST dynamics between polar and middle/low latitudes as revealed by us for the early interglacial phase. Our foraminiferal and alkenone SST data clearly demonstrate that the subtropical and the temperate climate zones experienced abrupt warming in accordance with insolation changes directly after Termination V. Such an early response to warming agrees with other investigations from the N. Atlantic (Oppo et al, 1998;McManus et al, 1999;de Abreu et al, 2005;Stein et al, 2009;Voelker et al, 2010;Rodrigues et al, 2011) and continental surroundings (Desprat et al, 2005;Nitychoruk et al, 2005;de Vernal and Hillaire-Marcel, 2008).…”

Section: Discussionmentioning

confidence: 65%

“…The prevalence of a zonal atmospheric circulation type would also explain the somewhat contradictive SST dynamics between the polar and middle latitudes during MIS 11c which were especially pronounced during the early phase (Bauch et al, 2000;Bauch and Erlenkeuser, 2003;Helmke and Bauch, 2003;Kandiano and Bauch, 2007). Although the Nordic Seas still exhibited almost glacial-like conditions during the early phase of MIS 11c, at the same time our rare species analysis and SST reconstructions would reveal a strong advection of warm subtropical waters into the middle latitudes.…”

Section: Ocean-atmospheric Circulation In the North Atlantic During Mmentioning

confidence: 66%

“…6). This significant delay in the establishment of warmest conditions in the Nordic Seas probably resulted from very specific surface ocean properties in the North -i.e., freshened by extensive ice-sheet melting causing enhanced expansion of seasonal sea-ice (Bauch et al, 2000), which in turn must have had a strong feedback also on the spatial configuration of the oceanatmosphere system over the North Atlantic region.…”

Section: Discussionmentioning

confidence: 99%

“…However, a comparison of the interglacial climate progress of these two periods in the North Atlantic reveals a number of distinct regional differences in geographical SST patterns and hydrological cycles. For instance, planktic foraminiferal data show that MIS 11c was characterized by warmer SSTs in the middle latitudes (Kandiano and Bauch, 2003;de Abreu et al, 2005), whereas farther north in the adjacent Nordic seas, interglacial conditions appear to have been rather cold (Bauch et al, 2000;Bauch and Erlenkeuser, 2003;Helmke and Bauch, 2003). By analogy with the modern situation, one can assume that these cold conditions in the Nordic seas may implicate extended sea-ice cover in this region which in turn further influenced oceanatmosphere interactions.…”

Section: Introductionmentioning

confidence: 99%

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The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Kandiano

Bauch

Fahl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Temporal and spatial patterns in eastern North Atlantic sea-surface temperatures (SST) were reconstructed for marine isotope stage (MIS) 11c using a submeridional transect of five sediment cores. The SST reconstructions are based on planktic foraminiferal abundances and alkenone indices, and are supported by benthic and planktic stable isotope measurements, as well as by ice-rafted debris content in polar and middle latitudes. Additionally, the larger-scale dynamics of the precipitation regime over northern Africa and the western Mediterranean region was evaluated from iron concentrations in marine sediments off NW Africa and planktic δ 13 C in combination with analysis of planktic foraminiferal abundances down to the species level in the Mediterranean Sea. Compared to the modern situation, it is revealed that during entire MIS 11c sensu stricto (ss), i.e., between 420 and 398 ka according to our age models, a cold SST anomaly in the Nordic seas co-existed with a warm SST anomaly in the middle latitudes and the subtropics, resulting in steeper meridional SST gradients than during the Holocene. Such a SST pattern correlates well with a prevalence of a negative mode of the modern North Atlantic Oscillation. We suggest that our scenario might partly explain the longer duration of wet conditions in the northern Africa during MIS 11c compared to the Holocene.

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Section: Discussionmentioning

confidence: 65%

Section: Ocean-atmospheric Circulation In the North Atlantic During Mmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

Kandiano

Bauch

Fahl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The deglacial process stopped near 408 ka (Bauch et al, 2000), and may have contributed to these changes in the properties of the seawater. Anyway, this unusual interval lasted 10 kyr.…”

Section: Paleoceanographic Changes During the Mbementioning

confidence: 99%

The Mid-Brunhes event in the southwestern Atlantic Ocean: coccolithophore assemblages during the Mis 11-9

Leonhartdt¹,

Toledo²,

Coimbra³

2015

Rev. bras. paleontol.

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-The paleoceanographic dynamics in the Southwestern Atlantic Ocean is still poorly understood, with most studies describing the last 25 ky. In the present study, the coccolithophore assemblages from a sediment core from the Brazilian continental margin (20º01'S) were analysed during the interval between 423-305 ky (Marine Isotopic Stages -MIS -11 to 9), including the important Mid-Brunhes Event (MBE). The coccolithophore assemblage is typically tropical: Gephyrocapsa spp. and Florisphaera profunda dominate the assemblage. The productivity (measured by the N ratio) was high throughout the entire studied interval, pointing to a shallow nutricline, induced by the northeast winds of the South Atlantic Subtropical High or by upwelling development. The coccolith numbers was low during almost all the studied interval, since this group is adapted to oligotrophic environments. However, between 420-410 ky, both coccolith numbers and N ratio were high, which may indicate the lack of silicate in the surface waters (reducing the diatom competitiveness). Globally, the MBE is marked by a high production of carbonate and the dominance of Gephyrocapsa caribbeanica in the coccolithophore assemblages. In this work, this dominance was recognized between 420-328 ky . Besides the high production of carbonate, the MBE is also globally marked by a great dissolution (Mid-Brunhes Dissolution Interval), but no signifi cant carbonate dissolution was found in this work.Key words: Mid-Brunhes Event, Mid-Brunhes Dissolution Interval, coccolithophorids, productivity, Southwestern Atlantic.RESUMO -A dinâmica paleoceanográfi ca no Oceano Atlântico Sudoeste ainda é pobremente compreendida, com a maioria dos estudos descrevendo os últimos 25 ky. Neste trabalho, as assembleias de cocolitoforídeos de um testemunho sedimentar da Margem Continental Brasileira (20º01'S) foram analisadas durante o intervalo entre 423-305 ky (Estágios Isotópicos Marinhos -EIM -11 a 9), incluindo o importante Evento do Brunhes Médio. A assembleia de cocolitoforídeos é tipicamente tropical: Gephyrocapsa spp. e Florisphaera profunda dominam a assembleia. A produtividade (medida pela razão N) foi alta durante todo o intervalo estudado, apontando para uma nutriclina rasa, induzida pelos ventos de nordeste da Alta Subtropical do Atlântico Sul ou pelo desenvolvimento de ressurgência. A abundância de cocólitos foi baixa durante quase todo intervalo estudado, já que este grupo é adaptado a condições oligotrófi cas. De qualquer forma, entre 420-410 ky, tanto a abundância de cocólitos quanto a razão N foram altas, o que pode indicar escassez de silicato nas águas superfi ciais (reduzindo a competitividade das diatomáceas). Globalmente, o Evento do Brunhes Médio é marcado por alta produção de carbonato e a dominância de Gephyrocapsa caribbeanica nas assembleias de cocolitoforídeos. Neste trabalho, esta dominância foi reconhecida entre 420-328 ky (EIM 11-9). Apesar da alta produção de carbonato, o Evento do Brunhes Médio também é globalmente marcado por uma grande dissolução...

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A cold and fresh ocean surface in the Nordic Seas during MIS 11: Significance for the future ocean

Kandiano

Meer

Bauch

et al. 2016

Geophysical Research Letters

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Paleoceanographical studies of Marine Isotope Stage (MIS) 11 have revealed higher‐than‐present sea surface temperatures (SSTs) in the North Atlantic and in parts of the Arctic but lower‐than‐present SSTs in the Nordic Seas, the main throughflow area of warm water into the Arctic Ocean. We resolve this contradiction by complementing SST data based on planktic foraminiferal abundances with surface salinity changes using hydrogen isotopic compositions of alkenones in a core from the central Nordic Seas. The data indicate the prevalence of a relatively cold, low‐salinity, surface water layer in the Nordic Seas during most of MIS 11. In spite of the low‐density surface layer, which was kept buoyant by continuous melting of surrounding glaciers, warmer Atlantic water was still propagating northward at the subsurface thus maintaining meridional overturning circulation. This study can help to better constrain the impact of continuous melting of Greenland and Arctic ice on high‐latitude ocean circulation and climate.

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A paleoclimatic evaluation of marine oxygen isotope stage 11 in the high-northern Atlantic (Nordic seas)

Cited by 70 publications

References 44 publications

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

The meridional temperature gradient in the eastern North Atlantic during MIS 11 and its link to the ocean–atmosphere system

The Mid-Brunhes event in the southwestern Atlantic Ocean: coccolithophore assemblages during the Mis 11-9

A cold and fresh ocean surface in the Nordic Seas during MIS 11: Significance for the future ocean

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