Productivity cycles of 200–300 years in the Antarctic Peninsula region: Understanding linkages among the sun, atmosphere, oceans, sea ice, and biota

Leventer, Amy; Domack, Eugene W.; Ishman, Scott E.; Brachfeld, Stefanie Ann; McClennen, Charles E.; Manley, P. L.

doi:10.1130/0016-7606(1996)108<1626:pcoyit>2.3.co;2

Cited by 227 publications

(284 citation statements)

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“…This sediment accumulates rapidly during changing sea-ice conditions, with maximum sea-ice conditions recorded at the core top, at 150-210 and 400 cm. Similar fluctuations, with periodicity of 200-250 years, have been observed in the Bransfield Strait (Leventer et al, 1996;Barcena et al, , 2002, and have been considered as Holocene neoglacial events (Barcena et al, , 2002. The oozes recovered in Core DF79-13 are also similar to those recovered from the Palmer Deep west of the Antarctic Peninsula during ODP Leg 178 (Barker et al, 1999), which also contain a high-resolution record of paleoproductivity that allows further investigation of the global extent of climate events presently defined in regional oceanic data (e.g., Younger Dryas in the North Atlantic) and the evaluation of the potential mechanisms that link biological productivity and climate in the Southern Ocean.…”

Section: Sedimentary Processes During the Holocenesupporting

confidence: 56%

“…4), with maximum sea-ice conditions recorded at the core top, at 150-210 cm, and at 400 cm. Similar fluctuations, with periodicity of 200-250 years, have been observed on the Bransfield Strait (Leventer et al, 1996;Barcena et al, , 2002. The species considered as sea-ice markers are Fragilariopsis curta, F. cylindrus, F. obliquecostata, F. ritscheri, F. sublinearis and F. vanheurckii.…”

Section: Biogenic Opalmentioning

confidence: 49%

“…During warmer episodes that are still fully glacial onshore, such as the Holocene, most terrigenous sedimentation occurs in front of the grounding line and in inner-shelf basins. As demonstrated by the study of cores from similar shelf settings west of the Antarctic Peninsula (Domack et al, 1993;Leventer et al, 1996;Barcena et al, , 2002 and George V Coast on the Wilkes Land margin (Presti et al, 2001), these inner-shelf basins effectively trap the products of biogenic productivity.…”

Section: Introductionmentioning

confidence: 99%

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Sediment distribution and sedimentary processes across the Antarctic Wilkes Land margin during the Quaternary

Escutia

Warnke

Acton

et al. 2003

Deep Sea Research Part II: Topical Studies in Oceanography

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The study of existing cores collected across the Wilkes Land margin provides us with a better understanding of the sediment distribution and processes across this margin during the Holocene, and during Pleistocene glacial and interglacial cycles. Holocene depositional rates are high in deep (>1000 m) inner-shelf basins where diatomaceous ooze is deposited at estimated minimum sedimentation rates ranging from 40 to 60 cm/kyr. In the shelf troughs, Holocene sediment has a patchy distribution or is totally absent. This is also the case on the shelf banks due to differential deposition because of the irregular relief of the continental shelf and the erosion and redistribution by bottom currents. Pleistocene interglacial sedimentation is well represented in sediment from the continental rise and is dominated by hemipelagic deposition of massive mud with the highest biogenic content (as indicated by %opal) and with a high abundance of clasts (IRD). During the Pleistocene glacial cycles, diamictons were deposited in the continental-shelf troughs and on the banks. Reworking (e.g., by bottom currents) and remobilization (e.g., gravity flows) of these diamictons is a common process along the shallow continental-shelf banks. On the continental slope and the continental rise, gravity flows are one of the most important sedimentary processes. Sediment from continental-slope cores, with a texture that greatly resembles the diamictons on the shelf, is interpreted to represent either part of a slump block or the start of a debris flow. Downslope, crudely stratified to laminated intervals represent the transition between an end member of a debris flow and a turbidity flow. Some of the laminated intervals in cores from the continental rise represent sediment deposited from a turbidity flow. Ages obtained from cores further support that slumps and gravity flows are dominant processes in this margin, because numerous hiatuses apparently are present in cores from the base of the slope. One of these cores extends into the Miocene. Elsewhere on the continental rise, massive and laminated sediments in cores of similar length record near-continuous Pleistocene sedimentation. r

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Section: Sedimentary Processes During the Holocenesupporting

confidence: 56%

Section: Biogenic Opalmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sediment distribution and sedimentary processes across the Antarctic Wilkes Land margin during the Quaternary

Escutia

Warnke

Acton

et al. 2003

Deep Sea Research Part II: Topical Studies in Oceanography

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“…from Kenya (Johnson et al, 1991), from high latitudes in the Northern Hemisphere (Briffa et al, 1992;Scuderi, 1993) and in California (Burroughs, 1992). An ∼200-year oscillation has been reported in Californian dendrochronological studies (Burroughs, 1992), from marine cores near the Antarctic Peninsula (Leventer et al, 1996), from Tibetan ice cores (Thompson et al, 1997), and from peat deposits in Scotland (Chambers et al, 1997) and Denmark (Aaby, 1976). Suggested possible forcing mechanisms for ∼200-year oscillations include solar variability Braziunas, 1989, 1993;Suess and Linick, 1990) and lunar tidal effects (Burroughs, 1992).…”

Section: Variability Over the Period Of Meteorological Recordmentioning

confidence: 99%

Millennial to multi‐decadal variability in the climate of southern Africa

Tyson

Cooper

McCarthy

2002

Intl Journal of Climatology

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Wavelet analysis has been used to determine changes in the variability of southern Africa climate over the last three millennia. The structure of the variability in a 3000-year δ 18 O record has been compared with that in tree ring data for the last 600 years and both to the variability in annual rainfall and runoff during the 20th century. Preferred modes of variability are shown to have occurred in all the data sets. For overlap periods, the variability modes are in phase where the data are for a common seasonal rainfall regime.From the combined proxy and instrumental data it appears that an ∼1500-year oscillation in rainfall variability may have been present during the late Holocene. Considerable variability in South African climate has been shown to reside in the bands 500-800 and 60-120 years. The latter is manifest in stable isotope and tree ring proxy data and in measured rainfall and runoff, and shows a distinctive latitudinal variation over southern Africa. The ∼80-year variability has been present for at least 600 years in the tree ring data and at least 3000 years in the stable isotope data. During the 20th century, the variability in the 60-120-year range was confined south of 20°S in southern Africa.The existence of considerable multi-decadal climate variability in the range 16-20 years has been confirmed south of 15°S. Tree ring data show that the ∼18-year oscillation in climate has been present for at least 600 years. The 500-800-year, ∼80-year and ∼18-year variability has been both frequency-and amplitude-modulated over time, but never to the extent that the variability bands have lost their integrity. Their persistence is a striking feature of southern African climate.The millennial, centennial and multi-decadal variability in climate over southern Africa finds counterparts with temporal variability in similar time ranges reported elsewhere. Spatial teleconnections in variability likewise have been shown to occur. The changes in climate variability over the subcontinent are part of variability changes affecting the Earth system in many other regions.

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“…1a; 3.6-0.3 ka: δ 18 O diatom mean = +41.7±0.8‰). We interpret this decrease as increasing glacial ice discharge rather than frontal melting because the persistent presence of warm UCDW in Palmer Deep ended at c. 3.6 ka 18 and diatom concentration and assemblage data indicate cooler SSTs and less spring sea ice melt-induced stratification after this time 4,22 . Increased glacial ice discharge was driven by atmospheric warming of the WAP and increased moisture delivery as a result of two forcing mechanisms; maximum Holocene ENSO frequency from c. 2.2 ka 5,17,20 (Fig.…”

mentioning

confidence: 99%