Holocene changes in eastern tropical Pacific climate inferred from a Galápagos lake sediment record

Conroy, Jessica L.; Overpeck, Jonathan T.; Cole, Julia E.; Shanahan, T. M.; Steinitz‐Kannan, Miriam

doi:10.1016/j.quascirev.2008.02.015

Cited by 650 publications

(718 citation statements)

References 76 publications

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“…Their interpretation, connecting climate to lake sediments is similar to our interpretation, i.e. an increase in storms tracking across the study site increases the contribution of coarse sediment into the lake basin (Moy et al 2002;Conroy et al 2008). Interestingly, our comparison to Moy et al (2002) and Conroy et al (2008) indicates that changes in the frequency of El Niño events is not driving the sand signal in Lake Elsinore (Fig.…”

Section: A Comparison To Paleo-enso Reconstructionssupporting

confidence: 86%

“…10, 12). If changes in the frequency of El Niño events were driving the sand signal in Lake Elsinore, it is reasonable to assume that our record should look similar to the Moy et al (2002) and the Conroy et al (2008) records. Because of the significant differences between the latter two records and our new sand data, we conclude that changes in the frequency and occurrence of El Niño events is not the predominant forcing behind the sand signal at Lake Elsinore, at least at multi-decadal to centennial scales.…”

Section: A Comparison To Paleo-enso Reconstructionsmentioning

confidence: 93%

“…Recently, Parris et al (2010) reconstructed a history of storm activity in the NE USA using changes in grain size. Conroy et al (2008) used grain size to infer changes in lake level and El Niño-Southern Oscillation variability in a small lake in the Galapagos Islands. Anderson (1977Anderson ( , 2001b demonstrated that enhanced river discharge and changes from dry to wet climates increase the sand content in arid-environment lakes.…”

Section: Age Controlmentioning

confidence: 99%

“…14). For comparison, we selected the Moy et al (2002) and Conroy et al (2008) paleo-ENSO reconstructions, which are centered on regions where the ENSO signal is robust and unequivocal. Both records use their sediment's physical properties to infer changes in the frequency of past El Niño events.…”

Section: A Comparison To Paleo-enso Reconstructionsmentioning

confidence: 99%

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A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

et al. 2010

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High-resolution terrestrial records of Holocene climate from Southern California are scarce. Moreover, there are no records of Pacific Decadal Oscillation (PDO) variability, a major driver of decadal to multi-decadal climate variability for the region, older than 1,000 years. Recent research on Lake Elsinore, however, has shown that the lake's sediments hold excellent potential for paleoenvironmental analysis and reconstruction. New 1-cm contiguous grain size data reveal a more complex Holocene climate history for Southern California than previously recognized at the site. A modern comparison between the twentieth century PDO index, lake level change, San Jacinto River discharge, and percent sand suggests that sand content is a reasonable, qualitative proxy for PDO-related, hydrologic variability at both multi-decadal-to-centennial as well as event (i.e. storm) timescales. A depositional model is proposed to explain the sand-hydrologic proxy. The sand-hydrologic proxy data reveal nine centennial-scale intervals of wet and dry climate throughout the Holocene. Percent total sand values [1.5 standard deviation above the 150-9,700 cal year BP average are frequent between 9,700 and 3,200 cal year BP (n = 41), but they are rare from 3,200 to 150 cal year BP (n = 6). This disparity is interpreted as a change in the frequency of exceptionally wet (high discharge) years and/or changes in large storm activity. A comparison to other regional hydrologic proxies (10 sites) shows more then

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Section: A Comparison To Paleo-enso Reconstructionssupporting

confidence: 86%

Section: A Comparison To Paleo-enso Reconstructionsmentioning

confidence: 93%

Section: Age Controlmentioning

confidence: 99%

Section: A Comparison To Paleo-enso Reconstructionsmentioning

confidence: 99%

See 2 more Smart Citations

A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

et al. 2010

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“…We pretreated sediment samples for grain size analysis using a laser-diffraction particle size analyzer (Malvern Mastersizer, 2000) coupled to a Hydro 2000S sample dispersion accessory. We report results as volume percent clay (<4.0 m diameter), fine silt (4.0-16.0 m diameter), middle silt (16.0-32.0 m diameter), coarse silt (32.0-64.0 m diameter) and sand-sized (>64.0 m diameter) particles for each sample (Conroy et al, 2008). The concentration of total organic carbon (TOC) is a fundamental parameter for describing the abundance of organic matter in sediments.…”

Section: Chemical Analysismentioning

confidence: 99%

Primary consumers as bioindicator of nitrogen pollution in lake planktonic and benthic food webs

Zhang

2012

Ecological Indicators

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ITCZ and ENSO pacing on East Asian winter monsoon variation during the Holocene: Sedimentological evidence from the Okinawa Trough

Zheng

Wan

et al. 2014

JGR Oceans

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Deep-sea fan sediments provide an excellent geological archive for paleoenvironment reconstruction. Grain size, clay mineral and elemental (Ti, Fe, Ca) compositions were measured for a core retrieved from a submarine fan in the Okinawa Trough. Varimax-rotated Principal Component Analysis (V-PCA) on time-evolution of grain size spectrum reveals that, since the Holocene, sediment was transported mainly by the benthic nepheloid layer (33%) and upper layers (33%) which is driven by the East Asian winter monsoon (EAWM). The intensification of the Kuroshio Current during the Holocene, masks the fluvial signal of the summer monsoon and obstructs clay minerals derived from the Yellow River, a major contributor prior to 12 ka BP. A new grain size index (GSI), which represents the EAWM well, exhibits a negative correlation with the d 18 O record in Dongge Cave, China during the Holocene when sea level was relatively steady. This anticorrelation suggests the southward migration of the Intertropical Convergence Zone (ITCZ). The consistency among our records and rainfall records in Peru, Ti counts in the Cariaco Basin, monsoon records in Oman and the averaged summer insolation pattern at 30 N further support the ITCZ's impact on monsoon systems globally. Cross-Correlation Analyses for GSI and log(Ti/Ca) against d 18 O record in Dongge Cave reveal a decoupling between the East Asian winter and summer monsoon during 5500-2500 cal yr BP, with greater complexity in the last 2500 years. This can be attributed to exacerbated ENSO mode fluctuations and possibly anthropogenic interference superimposed on insolation and ITCZ forcing.

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Holocene changes in eastern tropical Pacific climate inferred from a Galápagos lake sediment record

Cited by 650 publications

References 76 publications

A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

A Holocene record of Pacific Decadal Oscillation (PDO)-related hydrologic variability in Southern California (Lake Elsinore, CA)

Primary consumers as bioindicator of nitrogen pollution in lake planktonic and benthic food webs

ITCZ and ENSO pacing on East Asian winter monsoon variation during the Holocene: Sedimentological evidence from the Okinawa Trough

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