Macintosh Program performs time‐series analysis

Paillard, Didier; Labeyrie, Laurent D; Yiou, Pascal

doi:10.1029/96eo00259

Cited by 1,888 publications

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“…Variations in the intensity of wet summer and dry winter monsoon are deduced from the history of Paillard et al, 1996) the SSS record was detrended by a third-polynomial fit (upper panel) and spline interpolated on equidistant steps of 30 years with 25% lag. Horizontal bar shows band-width.…”

Section: Records Of Continental Wetness and Ariditymentioning

confidence: 99%

East Asian monsoon climate during the Late Pleistocene: high-resolution sediment records from the South China Sea

et al. 1999

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Based on the study of 10 sediment cores and 40 core-top samples from the South China Sea (SCS) we obtained proxy records of past changes in East Asian monsoon climate on millennial to bidecadal time scales over the last 220,000 years. Climate proxies such as global sea level, estimates of paleotemperature, salinity, and nutrients in surface water, ventilation of deep water, paleowind strength, freshwater lids, fluvial and=or eolian sediment supply, and sediment winnowing on the sea floor were derived from planktonic and benthic stable-isotope records, the distribution of siliciclastic grain sizes, planktonic foraminifera species, and the U K 37 biomarker index. Four cores were AMS-14 C-dated. Two different regimes of monsoon circulation dominated the SCS over the last two glacial cycles, being linked to the minima and maxima of Northern Hemisphere solar insolation. (1) Glacial stages led to a stable estuarine circulation and a strong O 2 -minimum layer via a closure of the Borneo sea strait. Strong northeast monsoon and cool surface water occurred during winter, in part fed by an inflow from the north tip of Luzon. In contrast, summer temperatures were as high as during interglacials, hence the seasonality was strong. Low wetness in subtropical South China was opposed to large river input from the emerged Sunda shelf, serving as glacial refuge for tropical forest. (2) Interglacials were marked by a strong inflow of warm water via the Borneo sea strait, intense upwelling southeast of Vietnam and continental wetness in China during summer, weaker northeast monsoon and high sea-surface temperatures during winter, i.e. low seasonality. On top of the long-term variations we found millennial-to centennial-scale cold and dry, warm and humid spells during the Holocene, glacial Terminations I and II, and Stage 3. The spells were coeval with published variations in the Indian monsoon and probably, with the cold Heinrich and warm Dansgaard-Oeschger events recorded in Greenland ice cores, thus suggesting global climatic teleconnections. Holocene oscillations in the runoff from South China centered around periodicities of 775 years, ascribed to subharmonics of the 1500-year cycle in oceanic thermohaline circulation. 102=84-year cycles are tentatively assigned to the Gleissberg period of solar activity. Phase relationships among various monsoon proxies near the onset of Termination IA suggest that summer-monsoon rains and fluvial runoff from South China had already intensified right after the last glacial maximum (LGM) insolation minimum, coeval with the start of Antarctic ice melt Wang et al. / Marine Geology 156 (1999) prior to the δ 18 O signals of global sea-level rise. Vice versa, the strength of winter-monsoon winds decreased in short centennial steps only 3000-4000 years later, along with the melt of glacial ice sheets in the Northern Hemisphere.

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Section: Records Of Continental Wetness and Ariditymentioning

confidence: 99%

East Asian monsoon climate during the Late Pleistocene: high-resolution sediment records from the South China Sea

et al. 1999

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“…Accepting the correlation between K^ and insolation as causally connected we can extend the correlation to cover all eight peaks Comparison of K* concentrations in sediments of Lake Pata, Brazil, with % departure from modem December-January-February insolation to 0° latitude. Insolation data derived using Analyseries 2.1 software (Paillard et al, 1996). of K .…”

Section: Interpretation Of the Palaeochemical Recordmentioning

confidence: 99%

Amazonian paleoecological histories: one hill, three watersheds

Bush

Oliveira

Colinvaux

et al. 2004

Palaeogeography, Palaeoclimatology, Palaeoecology

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Data from the Hill of Six Lakes, in the northwestern Brazilian Amazon region, provide three records of paleoclimatic and vegetation change in lowland Amazonia that span the last 170,000 years. Three lakes, Verde, Pata and Dragäo, which occupy separate watersheds on the hill, provide the most detailed image yet obtained of ice-age conditions in lowland Amazonia. Welldated sedimentary records for fossil palynological, charcoal, cation, and pigment, data are presented.The data indicate the continuous presence of mesic forest throughout the last ice age. Oscillations of lake level are recorded and the lowstands are attributed to reduced precipitation inputs to systems delicately balanced between water loss (leakage through the floor of the basin) and gain (precipitation). Gross stratigraphy, algal remains, and paleochemistry suggest that the stands of high and low lake level were cyclic, apparently correlating precessional orbital variation. Times of lake lowstand coincide with wet season (December-January-February, DJF) insolation minima. The strongest of eight lowstand cycles occurred ca. 35,000 to 27,000 cal BP.Even during lowstand episodes, pollen is well preserved and provides a clear signal of uninterrupted forest cover. The principal lowland elements are continuously present in the record, suggesting the long-term (Quaternary) availability of the lowland forest biome in this region. However, during the late Pleistocene the forest changed in composition with the expansion or invasion of montane floral elements creating communities of the mesic forest biome without modem analogs. While precipitation cycles were causing lake levels to rise and fall, the principal influence on vegetation appears to have been cooling. In the late Pleistocene, the population expansion of montane elements at lower elevations is consistent with a cooling of 4-5 °C.

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“…Spectral analysis of the δ 18 O time-series was performed by using AnalySeries software (Paillard et al, 1996). Prior to spectral analysis, the distance scale of the x-axis was converted to a time series by assuming a peak-to-peak annual cycle and constant growth between each δ 18 O peak.…”

Section: Mid-holocene Paleoclimate and The Use Of Giant Clams As Palementioning

confidence: 99%

A 60-year isotopic record from a mid-Holocene fossil giant clam (Tridacna gigas) in the Ryukyu Islands: physiological and paleoclimatic implications

Watanabe¹,

Suzuki²,

Kawahata³

et al. 2004

Palaeogeography, Palaeoclimatology, Palaeoecology

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We have constructed a 60-year stable isotope record from a 14 C-dated fossil giant clam, Tridacna gigas (6216 years BP), at its northernmost latitudinal limit in the geological past, on Kume Island, Central Ryukyu Archipelago, Japan. Stable oxygen (δ 18 O) and carbon (δ 13 C) isotopic analyses are combined with observations of growth lines seen on the inner shell layer.Sixty pairs of summer/winter growth lines which preserve daily growth increments were observed in the inner shell layer. Two growth phases, characterized by a growth curve and isotopic profiles, are clearly recognized throughout the growth history of this specimen. No significant shifts in average values of the two isotopic ratios were detected during its growth history, although the growth rate varied widely from 1 mm to 15 mm per year over 60 years, including after the onset of sexual maturity. Spectral analysis of the fossil Tridacna δ 18 O 21 time-series implies that decadal variability observed in the North Pacific Ocean during the past hundred years also existed 6000 years ago. Our study implies that fossil giant clams are one of the best means of inferring isotopic records of annual to decadal climate variations. Giant clams have the advantages of a dense shell, high growth rate, long lifespan, and geographically and geologically broad distributions.

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Macintosh Program performs time‐series analysis

Cited by 1,888 publications

References 0 publications

East Asian monsoon climate during the Late Pleistocene: high-resolution sediment records from the South China Sea

East Asian monsoon climate during the Late Pleistocene: high-resolution sediment records from the South China Sea

Amazonian paleoecological histories: one hill, three watersheds

A 60-year isotopic record from a mid-Holocene fossil giant clam (Tridacna gigas) in the Ryukyu Islands: physiological and paleoclimatic implications

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