High-resolution alkenone sea surface temperature variability on the North Icelandic Shelf: implications for Nordic Seas palaeoclimatic development during the Holocene

Bendle, James; Rosell-Melé, Antoni

doi:10.1177/0959683607073269

Cited by 79 publications

(50 citation statements)

References 139 publications

(261 reference statements)

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“…The highest IP 25 contents determined for the past 600 years BP in all cores are tentatively attributable to the 'Little Ice Age' cooling that is also recorded in further marine (e.g. Andersson et al, 2003;Moros et al, 2006;Bendle and Rosell-Melé, 2007;Spielhagen et al, 2011) and also terrestrial archives from the subpolar North Atlantic (e.g. Nesje et al, 2001;Seppä and Birks, 2002).…”

Section: The Late Holocene (The Past 3000 Years Bp)mentioning

confidence: 76%

Holocene cooling culminates in sea ice oscillations in Fram Strait

Müller

Werner

Stein

et al. 2012

Quaternary Science Reviews

221

272

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a b s t r a c tA reconstruction of Holocene sea ice conditions in the Fram Strait provides insight into the palaeoenvironmental and palaeoceanographic development of this climate sensitive area during the past 8500 years BP. Organic geochemical analyses of sediment cores from eastern and western Fram Strait enable the identification of variations in the ice coverage that can be linked to changes in the oceanic (and atmospheric) circulation system. By means of the sea ice proxy IP 25 , phytoplankton-derived biomarkers and ice rafted detritus (IRD) increasing sea ice occurrences are traced along the western continental margin of Spitsbergen throughout the Holocene, which supports previous palaeoenvironmental reconstructions that document a general cooling. A further significant ice advance during the Neoglacial is accompanied by distinct sea ice fluctuations, which point to short-term perturbations in either the Atlantic Water advection or Arctic Water outflow at this site. At the continental shelf of East Greenland, the general Holocene cooling, however, seems to be less pronounced and sea ice conditions remained rather stable. Here, a major Neoglacial increase in sea ice coverage did not occur before 1000 years BP. Phytoplankton-IP 25 indices ("PIP 25 -Index") are used for more explicit sea ice estimates and display a Mid Holocene shift from a minor sea ice coverage to stable ice margin conditions in eastern Fram Strait, while the inner East Greenland shelf experienced less severe to marginal sea ice occurrences throughout the entire Holocene.

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Section: The Late Holocene (The Past 3000 Years Bp)mentioning

confidence: 76%

Holocene cooling culminates in sea ice oscillations in Fram Strait

Müller

Werner

Stein

et al. 2012

Quaternary Science Reviews

221

272

View full text Add to dashboard Cite

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“…A plethora of marine 'climate' proxies have been published in the last decade for N Iceland waters Castaneda et al, 2004;Giraudeau et al, 2004;Knudsen et al, 2004;Jiang et al, 2005;Bendle and Rosell-Mele, 2007;Kristjansdottir et al, 2007;Justwan and Koç, 2008;Ran et al, 2008) to mention a few. Of these, changes in the d 18 O of nearsurface planktonic foraminifera N. pachyderma (s) give direct information of variations in water density (Lynch-Stieglitz et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Seeking a Holocene drift ice proxy: non‐clay mineral variations from the SW to N‐central Iceland shelf: trends, regime shifts, and periodicities

Andrews

2009

J Quaternary Science

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Quantitative X-ray diffraction analysis of the <2 mm sediment fraction was carried out on 1257 samples (from the seafloor and 16 cores) from the Iceland shelf west of 188 W. All but one core (B997-347PC) were from transects along troughs on the NW to N-central shelf, an area that in modern and historic times has been affected by drift ice. The paper focuses on the non-clay mineralogy of the sediments (excluding calcite and volcanic glass). Quartz and potassium feldspars occupy similar positions in an R-mode principal component analysis, and oligoclase feldspar tracks quartz; these minerals are used as a proxy for ice-rafted detritus (IRD). Accordingly, the sum of these largely foreign minerals (Q&K) (to Icelandic bedrock) is used as a proxy for drift ice. A stacked, equi-spaced 100 a record is developed which shows both low-frequency trends and higher-frequency events. The detrended stacked record compares well with the flux of quartz (mg cm À2 a À1 ) at MD99-2269 off N Iceland. The multi-taper method indicated that there are three significant frequencies at the 95% confidence level with periods of ca. 2500, 445 and 304 a. Regime shift analysis pinpoints intervals when there was a statistically significant shift in the average Q&K weight %, and identifies four IRDrich events separated by intervals with lower inputs. There is some association between peaks of IRD input, less dense surface waters (from d 18 O data on planktonic foraminifera) and intervals of moraine building.

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“…Recent studies suggest that the mean atmospheric state of the early Holocene resembled the positive phase of the Arctic Oscillation (AO+) (8,(28)(29)(30)(31). In addition to AO+ anomalies, coral records from the tropical Pacific indicate major changes in sea-surface temperature variability, which suggest a progressive increase in ENSO (El Niño-Southern Oscillation) frequency starting around 7,000 cal B.P.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear response of summer temperature to Holocene insolation forcing in Alaska

Clegg

Kelly²,

Clarke³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Regional climate responses to large-scale forcings, such as precessional changes in solar irradiation and increases in anthropogenic greenhouse gases, may be nonlinear as a result of complex interactions among earth system components. Such nonlinear behaviors constitute a major source of climate "surprises" with important socioeconomic and ecological implications. Paleorecords are key for elucidating patterns and mechanisms of nonlinear responses to radiative forcing, but their utility has been greatly limited by the paucity of quantitative temperature reconstructions. Here we present Holocene July temperature reconstructions on the basis of midge analysis of sediment cores from three Alaskan lakes. Results show that summer temperatures during 10,000-5,500 calibrated years (cal) B.P. were generally lower than modern and that peak summer temperatures around 5,000 were followed by a decreasing trend toward the present. These patterns stand in stark contrast with the trend of precessional insolation, which decreased by ∼10% from 10,000 y ago to the present. Cool summers before 5,500 cal B.P. coincided with extensive summer ice cover in the western Arctic Ocean, persistence of a positive phase of the Arctic Oscillation, predominantly La Niña-like conditions, and variation in the position of the Alaskan treeline. These results illustrate nonlinear responses of summer temperatures to Holocene insolation radiative forcing in the Alaskan sub-Arctic, possibly because of state changes in the Arctic Oscillation and El Niño-Southern Oscillation and associated land-atmosphere-ocean feedbacks.Chironomidae | paleotemperature | climate change | high latitudes | land-ocean-atmosphere interaction A lthough radiative forcing by greenhouse gases is spatially uniform, temperature trajectories have displayed high variability both spatially and temporally during the 20th and 21st centuries. Understanding the patterns and causes of this variability is paramount to anticipating the impacts of climate change at local to regional scales. Among the major contributing factors is nonlinearity in regional temperature responses to large-scale climate forcings. Such nonlinearity may result from land-ocean feedbacks to atmospheric warming and atmosphere-ocean teleconnections associated with climate modes such as the Arctic Oscillation/North Atlantic Oscillation (AO/NAO) (1). For example, rising global mean temperatures are projected to increase prevalence of the AO/NAO positive phase by the end of this century. This change could accentuate the contrast of warming over Eurasia and interior Canada with cooling over northeastern Canada.Paleorecords can help elucidate mechanisms leading to nonlinear and spatially heterogeneous responses of temperature to radiative forcing. During the Holocene, high-latitude insolation varied markedly with the precessional cycle; for example, July short-wave radiation declined by ∼50 W m −2 at 65°N latitude throughout the Holocene (2). Paleoclimate data and model simulations have demonstrated the dominant effect of d...

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High-resolution alkenone sea surface temperature variability on the North Icelandic Shelf: implications for Nordic Seas palaeoclimatic development during the Holocene

Cited by 79 publications

References 139 publications

Holocene cooling culminates in sea ice oscillations in Fram Strait

Holocene cooling culminates in sea ice oscillations in Fram Strait

Seeking a Holocene drift ice proxy: non‐clay mineral variations from the SW to N‐central Iceland shelf: trends, regime shifts, and periodicities

Nonlinear response of summer temperature to Holocene insolation forcing in Alaska

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