Latest Quaternary North Pacific surface-water responses imply atmosphere-driven climate instability

Hendy, I. L.; Kennett, James P.

doi:10.1130/0091-7613(1999)027<0291:lqnpsw>2.3.co;2

Cited by 165 publications

(129 citation statements)

References 9 publications

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“…Warmer sea-surface temperatures in the Santa Barbara Basin during MIS 3 have been attributed to northward shifts in the position of the subtropical high, the Aleutian low, and the jet stream (Hendy and Kennett, 1999). A significant northward shift of North Pacific atmospheric circulation patterns would have led to warmer year-round conditions in the Pacific Northwest and to a change from relatively dry to wet winters.…”

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

“…Warming along the west coast of North America during MIS 2 may have resulted from a brief expansion of the subtropical high. Small changes in the subtropical high have been attributed to variations in Laurentide ice-sheet size and in North Atlantic atmospheric and oceanic circulation (Clark and Bartlein, 1995;Hendy and Kennett, 1999). However, model simulations of the last glacial maximum do not show warmer conditions along the coast in response to a reduction in ice-sheet height or an increase in sea-surface temperatures in the North Atlantic (Hostetler and Bartlein, 1999).…”

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

“…In the Northeast Pacific, cores from the Santa Barbara Basin and the central California and southern Oregon margins show variations in sea-surface temperatures and oceanic circulation (Behl and Kennett, 1996;Gardner et al, 1997;Hendy and Kennett, 1999;Lund and Mix, 1998). Millennial-scale variations in these regions have primarily been associated with shifts in the position and strength of the Eastern Pacific subtropical high, the Aleutian low, and the jet stream.…”

Section: Introductionmentioning

confidence: 99%

“…A bioturbation index of four indicates periods of laminated sediments. Low values of the bioturbation index reflect intervals that correlate with warmer sea-surface temperatures (Hendy and Kennett, 1999). signal implies little change in the position of the jet stream. In addition, strong upwelling along the central California margin suggests that the jet stream and subtropical high were close to their present positions (Gardner et al, 1997).…”

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

“…A comparison of the Little Lake data with a record of seasurface temperatures and sediment bioturbation from the Santa Barbara Basin (Behl and Kennett, 1996;Hendy and Kennett, 1999) provides an opportunity to evaluate current explanations of millennial-scale climate change in western North America and the Northeast Pacific. The pollen-based temperature proxy from Little Lake, when compared with the bioturbation index from the Santa Barbara Basin, shows that low values coincide with warmer sea-surface temperatures (Fig.…”

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

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Evidence for Millennial-Scale Climate Change During Marine Isotope Stages 2 and 3 at Little Lake, Western Oregon, U.S.A.

2001

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Pollen and geochemical data from Little Lake, western Oregon, suggest several patterns of millennial-scale environmental change during marine isotope stage (MIS) 2 (14,100-27,600 cal yr B.P.) and the latter part of MIS 3 (27,600-42,500 cal yr B.P.). During MIS 3, a series of transitions between warm-and cold-adapted taxa indicate that temperatures oscillated by ca. 2 • -4 • C every 1000-3000 yr. Highs and lows in summer insolation during MIS 3 are generally associated with the warmest and coldest intervals. Warm periods at Little Lake correlate with warm sea-surface temperatures in the Santa Barbara Basin. Changes in the strength of the subtropical high and the jet stream may account for synchronous changes at the two sites. During MIS 2, shifts between mesic and xeric subalpine forests suggest changes in precipitation every 1000-3000 yr. Increases in Tsuga heterophylla pollen at 25,000 and 22,000 cal yr B.P. imply brief warmings. Minimum summer insolation and maximum global ice-volumes during MIS 2 correspond to cold and dry conditions. Fluctuations in precipitation at Little Lake do not correlate with changes in the Santa Barbara Basin and may be explained by variations in the strength of the glacial anticyclone and the position of the jet stream. C 2001 University of Washington.

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Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

Section: Causes Of Millennial-scale Climate Change At Little Lakementioning

confidence: 99%

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Evidence for Millennial-Scale Climate Change During Marine Isotope Stages 2 and 3 at Little Lake, Western Oregon, U.S.A.

2001

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Vertical oxygen minimum zone oscillations since 20 ka in Santa Barbara Basin: A benthic foraminiferal community perspective

et al. 2014

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[1] Here we present a history of deoxygenation of upper intermediate waters during the last deglaciation from Santa Barbara Basin (SBB), based on quantitative analyses of benthic foraminiferal assemblages, from a new shallow piston core above basin sill depth (MV0811-15JC, 418 m), and previously described sequences in the deeper basin (MD02-2504, 481 m and MD02-2503, 570 m). We document a 152 m depth transect of benthic foraminiferal assemblages to extract changing community structure (density, diversity, and evenness) and improve paleoenvironmental interpretation of late Quaternary vertical oscillations in the upper boundary of the oxygen minimum zone (OMZ). Close interaction between changes in open margin OMZ and that of the restricted SBB is documented using these quantitative techniques. MV0811-15JC, while being unlaminated, contains strongly hypoxic foraminiferal assemblages (including species Bolivina tumida and Nonionella stella), coeval with preserved sediment laminations in the deeper cores. Last Glacial Maximum (LGM) assemblages across this transect contained oxic fauna and high diversity. At 14.7 ka, glacial termination IA, hypoxic benthic fauna appeared across the transect, recording hypoxic waters (<0.5 ml L À1 ) < 300 m from the ocean surface. Bølling/Allerød (B/A) assemblages uniquely stand out in the record, exhibited by low density, diversity, and evenness, and taxonomic composition reflecting extreme and stressful hypoxia and methane-rich environments. Younger Dryas assemblages were diverse and composed of oxic fauna, similar to LGM assemblages. Termination IB initiated another deoxygenation shift, followed by OMZ-associated faunal and density patterns. This analysis strengthens the quantitative assessment of oxygen concentrations involved in deglacial OMZ change and reveals the unexpected, remarkable shallowness of OMZ influence during the B/A.

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Persistent millennial‐scale climate variability in the eastern tropical North Pacific over the last two glacial cycles

et al. 2015

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High-resolution sediment records from the eastern tropical North Pacific (ETNP) spanning the last~240 ka B.P. were studied to document the nature of millennial-scale climatic events in the tropical Pacific and to investigate teleconnection mechanisms. We present organic carbon (%OC) and diffuse spectral reflectivity records as indicative of upwelling and productivity changes off NW Mexico over the middle to late Pleistocene. The new productivity records document the persistence of abrupt millennial-scale changes over the last two glacial cycles. Detailed spectral and wavelet time series analyses show the predominance of longer climatic cycles (2-6 ka) during the last and the penultimate glacial periods. The persistence of millennial variability during the penultimate glacial, in absence of large ice rafted debris events in the North Atlantic, suggests that freshwater input through ice sheet dynamics is not essential for millennial-scale climate variability. Given the worldwide emerging picture of remarkable similar millennial-scale records over long time periods, we suggest that the pacing of this climate variability may represent a natural resonance in the climate system, amplified by a tightly coupled oceanic and atmospheric teleconnection processes. We present a schematic scenario of millennial-scale climate change depicting the role of the tropical Pacific in this global teleconnection system by linking productivity and upwelling changes in the ETNP with shifts in the position of the Intertropical Convergence Zone and the strength of the subtropical North Pacific High.

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Latest Quaternary North Pacific surface-water responses imply atmosphere-driven climate instability

Cited by 165 publications

References 9 publications

Evidence for Millennial-Scale Climate Change During Marine Isotope Stages 2 and 3 at Little Lake, Western Oregon, U.S.A.

Evidence for Millennial-Scale Climate Change During Marine Isotope Stages 2 and 3 at Little Lake, Western Oregon, U.S.A.

Vertical oxygen minimum zone oscillations since 20 ka in Santa Barbara Basin: A benthic foraminiferal community perspective

Persistent millennial‐scale climate variability in the eastern tropical North Pacific over the last two glacial cycles

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