Late Cenozoic History of the Polar North Atlantic: Results From Ocean Drilling

Thiede, Jörn; Winkler, Amelie; Wolf-Welling, T. C. W.; Eldholm, Olav; Myhre, Annik M.; Baumann, Karl-Heinz; Henrich, Rüdiger; Stein, Rüdiger

doi:10.1016/s0277-3791(97)00076-0

Cited by 134 publications

(87 citation statements)

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“…In fact, Leg 151 had close ties to PONAM and during this project analysis of Site 909, located in the Fram Strait (Fig. 1), showed the first IRD pulses in the middle Miocene at 14 Ma (Thiede et al, 1998). However, since limited older sediments were recovered from Site 909, it is not possible to exclude that IRD events also occurred earlier here, as documented for Site 913.…”

Section: Greenland Ice Sheetmentioning

confidence: 68%

New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

Jakobsson

Long

Inǵólfsson

et al. 2010

Quaternary Science Reviews

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a b s t r a c tTerrestrial and marine geological archives in the Arctic contain information on environmental change through Quaternary interglacialeglacial cycles. The Arctic Palaeoclimate and its Extremes (APEX) scientific network aims to better understand the magnitude and frequency of past Arctic climate variability, with focus on the "extreme" versus the "normal" conditions of the climate system. One important motivation for studying the amplitude of past natural environmental changes in the Arctic is to better understand the role of this region in a global perspective and provide base-line conditions against which to explore potential future changes in Arctic climate under scenarios of global warming. In this review we identify several areas that are distinct to the present programme and highlight some recent advances presented in this special issue concerning Arctic palaeo-records and natural variability, including spatial and temporal variability of the Greenland Ice Sheet, Arctic Ocean sediment stratigraphy, past ice shelves and marginal marine ice sheets, and the Cenozoic history of Arctic Ocean sea ice in general and Holocene oscillations in sea ice concentrations in particular. The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean. This has important consequences for our understanding of the recent trend of declining sea ice, and calls for further research on causal links between Arctic climate and sea ice.

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Section: Greenland Ice Sheetmentioning

confidence: 68%

New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

Jakobsson

Long

Inǵólfsson

et al. 2010

Quaternary Science Reviews

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“…The Cenozoic cooling trend [6] and the corresponding decrease in atmospheric CO 2 content are currently interpreted as the cause of Antarctic glaciation [37]. Ice buildup and development of a major Antarctic ice sheet [38] and ''embryonal'' ice caps in the Northern Hemisphere [39] caused strong ocean circulation rearrangements, with an increase in the flow of Northern Component Water (NCW, the precursor to modern NADW) at 17-15 Ma, enhancing basin to basin nutrient fractionation. Global cooling-related nutrient partitioning between Pacific and Atlantic at ca.…”

Section: The Conveyor Belt and Silica: Todaymentioning

confidence: 99%

Opal sedimentation shifts in the World Ocean over the last 15 Myr

Cortese

Gersonde

Hillenbrand

et al. 2004

Earth and Planetary Science Letters

149

130

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Biogenic silica (opal) accumulation records were used to trace mechanisms, consequence, and geographic pattern of shifts in the main locus of opal deposition of the World Ocean over the last 15 Myr. Over this time interval, the main opal ''sink'' seems to have moved from the North Atlantic, to the Pacific, equatorial Pacific, eastern equatorial Pacific, eastern boundary current upwelling systems (California, Namibia, Peru), and finally to the Southern Ocean. The interplay between opal deposition and a series of climatic, tectonic, oceanographic, and biologic events has been analyzed and discussed. These events include the Cenozoic global cooling trend, intensified glaciation in Antarctica, Late Miocene -Early Pliocene biogenic bloom, development of Northern Hemisphere Glaciation (NHG), closing of the Panama Seaway, transition of the climate system from a monopolarto a bipolar-glaciated world, Mid-Pleistocene Revolution (MPR), nutrient availability, evolution of diatoms and C4 plants, and changes in continental weathering rates. While the observed shifts are mostly traceable to oceanic reorganizations and global climatic evolution, conditions favorable to opal deposition involve the above-mentioned complex mix of processes. For this reason, the interpretation of opal deposition records might not always be straightforward. We, however, believe that it can still provide clear indications of large-scale oceanographic reorganizations in the geological past. D

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“…However, rather little is known about the natural and environmental variability on geological timescales. Our current knowledge on the Cenozoic climate evolution of the Arctic has long been based on sparse, often discontinuous marine and terrestrial paleorecords of the Arctic Ocean and adjacent landmasses (Thiede et al, 1998;Moran et al, 2006;Axford et al, 2009;Pienitz et al, 2009;Zech et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Multivariate statistic and time series analyses of grain-size data in quaternary sediments of Lake El'gygytgyn, NE Russia

et al. 2013

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Abstract. Lake El'gygytgyn, located in the Far East Russian Arctic, was formed by a meteorite impact about 3.58 Ma ago. In 2009, the International Continental Scientific Drilling Program (ICDP) at Lake El'gygytgyn obtained a continuous sediment sequence of the lacustrine deposits and the upper part of the impact breccia. Here, we present grain-size data of the past 2.6 Ma. General downcore grain-size variations yield coarser sediments during warm periods and finer ones during cold periods. According to principal component analysis (PCA), the climate-dependent variations in grainsize distributions mainly occur in the coarse silt and very fine silt fraction. During interglacial periods, accumulation of coarser material in the lake center is caused by redistribution of clastic material by a wind-induced current pattern during the ice-free period. Sediment supply to the lake is triggered by the thickness of the active layer in the catchment and the availability of water as a transport medium. During glacial periods, sedimentation at Lake El'gygytgyn is hampered by the occurrence of a perennial ice cover, with sedimentation being restricted to seasonal moats and vertical conduits through the ice. Thus, the summer temperature predominantly triggers transport of coarse material into the lake center. Time series analysis that was carried out to gain insight into the frequency of the grain-size data showed variations predominately on 98.5, 40.6, and 22.9 kyr oscillations, which correspond to Milankovitch's eccentricity, obliquity and precession bands. Variations in the relative power of these three oscillation bands during the Quaternary suggest that sedimentation processes at Lake El'gygytgyn are dominated by environmental variations caused by global glacial-interglacial variations (eccentricity, obliquity), and local insolation forcing and/or latitudinal teleconnections (precession), respectively.

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Late Cenozoic History of the Polar North Atlantic: Results From Ocean Drilling

Cited by 134 publications

References 0 publications

New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

Opal sedimentation shifts in the World Ocean over the last 15 Myr

Multivariate statistic and time series analyses of grain-size data in quaternary sediments of Lake El'gygytgyn, NE Russia

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