Recent changes in climate in the far western equatorial Pacific and their relationship to the Southern Oscillation; oxygen isotope records from massive corals, Papua New Guinea

Tudhope, Alexander W.; Shimmield, Graham; Chilcott, Colin P.; Jebb, Matthew; Fallick, Anthony E.; Dalgleish, A. N.

doi:10.1016/0012-821x(95)00156-7

Cited by 114 publications

(55 citation statements)

References 25 publications

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“…1). The oxygen isotope ratio (δ 18 O) from living coral at the three sites is found to be strongly correlated with ENSO activity due to cooler (warmer) SSTs and decreased (increased) precipitation during El Niño (La Niña) events (Tudhope et al, 1995(Tudhope et al, , 2001. Selected modern and fossil coral oxygen isotope records from the mid-and late Holocene are shown in Fig.…”

Section: Mid-holocene Coral Recordsmentioning

confidence: 98%

“…While SST and precipitation vary together for modern ENSO events at the coral site (e.g. Tudhope et al, 1995), this relationship may differ for past climates. For example, Gagan et al (2004) examine coral oxygen isotope ratios and Sr/Ca Tudhope et al (2001)).…”

Section: Mid-holocene Coral Recordsmentioning

confidence: 99%

“…ratios at 6.2 ka from Great Barrier Reef fossil corals and find that SST variability associated with ENSO was reduced by 20% while precipitation variability was reduced by around 70% compared with late 20th century values. It is possible that changes in ENSO precipitation teleconnections may contribute to the large reduction in amplitude in the Huon Peninsula records, as the signal at the Papua New Guinea site is predominantly influenced by precipitation rather than SST for modern coral records (Tudhope et al, 1995). We therefore investigate the changes in modelled ENSO precipitation and SST variability in comparison with the proxy record.…”

Section: Mid-holocene Coral Recordsmentioning

confidence: 99%

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Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records

2006

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Abstract. The sensitivity of El Niño-Southern Oscillation (ENSO) to changes in mean climate is investigated for simulations of pre-industrial and mid-Holocene (6000 years before present) climate using the Hadley Centre coupled atmosphere-ocean model, HadCM3. Orbitally-forced changes in insolation in the mid-Holocene produce changes in seasonality which may alter ENSO amplitude and frequency. The model simulations are compared with midHolocene fossil coral oxygen isotope records from the western Pacific Warm Pool. The coral records imply a reduction of around 60% in the amplitude of interannual variability associated with ENSO in the mid-Holocene, while the model simulates a smaller reduction in ENSO amplitude of around 10%. The model also simulates a slight shift to longer period variability and a weakening of ENSO phase-locking to the seasonal cycle in the mid-Holocene. There is little change in the pattern of ENSO tropical precipitation teleconnections in the simulated mid-Holocene climate.

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Section: Mid-holocene Coral Recordsmentioning

confidence: 98%

Section: Mid-holocene Coral Recordsmentioning

confidence: 99%

Section: Mid-holocene Coral Recordsmentioning

confidence: 99%

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Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records

2006

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“…period of reduced ENSO amplitude seen both here and in other records within and beyond the tropical Paci"c. In addition, corals from Papua New Guinea and Indonesia reveal interannual variability in O that is strongly correlated with the Southern Oscillation (Tudhope et al, 1995;Fairbanks et al, 1997).…”

Section: Decadal Variability and Ensomentioning

confidence: 99%

New views of tropical paleoclimates from corals

Gagan

Ayliffe

Beck

et al. 2000

Quaternary Science Reviews

453

287

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Corals o!er a rich archive of past climate variability in tropical ocean regions where instrumental data are limited and where our knowledge of multi-decadal climate sensitivity is incomplete. In the eastern equatorial Paci"c, coral isotopic records track variations in ENSO-related changes in sea-surface temperature; further west, corals record variability in sea-surface temperature and rainfall that accompanies zonal displacement of the Indonesian Low during ENSO events. These multi-century records reveal previously unrecognised ENSO variability on time scales of decades to centuries. Outside the ENSO-sensitive equatorial Paci"c, long-term trends towards recent warmer/wetter conditions suggest the tropics respond to global forcings. New coral paleothermometers indicate that surface-ocean temperatures in the tropical southwestern Paci"c were depressed by 4}63C during the Younger Dryas climatic event and rose episodically during the next 4000 yr. High temporal-resolution measurements of Sr/Ca and O in corals provide information about the surface-ocean hydrologic balance and can resolve the seasonal balance between precipitation and evaporation. Radiocarbon measurements in corals, coupled with ocean circulation models, may be used to reconstruct near-surface ocean circulation, past mixing rates, and the distribution of fossil fuel CO in the upper ocean. Most recently, seasonal to interannual variations in the radiocarbon of corals from the equatorial Paci"c have been linked to the redistribution of surface waters associated with the ENSO.

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“…Nevertheless, several centuries-long reconstructions of ENSO and PDO have been reported. Paleo-ENSO records are based on the oxygen isotopic (δ 18 O) composition of coral aragonite (Tudhope et al, 2001(Tudhope et al, , 1995 or on the carbon isotopic (δ 13 C) composition of stalagmite calcite (Frappier et al, 2002), as well as on tree ring data (D'Arrigo et al, 2005;Stahle et al, 1998). These records share a significant common variance and suggest that El Niño events of past centuries share a relatively Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

confidence: 99%

Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917–2004

2009

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Abstract. The varved sedimentary AD 1917 record from the depositional center of the Santa Barbara Basin (SBB, California) was analyzed with monthly to triannual resolution to yield relative abundances of six coccolithophore species representing at least 96% of the coccolithophore assemblage. Seasonal/annual relative abundances respond to climatic and surface hydrographic conditions in the SBB, whereby (i) the three species G. oceanica, H. carteri and F. profunda are characteristic of the strength of the northward flowing warm California Counter Current, (ii) the two species G. ericsonii and G. muellerae are associated with the cold equatorward flowing California Current, (iii) and E. huxleyi appears to be endemic to the SBB. Spectral analyses on relative abundances of these species show that all are influenced by the El Niño Southern Oscillation (ENSO) and/or by the Pacific Decadal Oscillation (PDO). Increased relative abundances of G. oceanica and H. carteri are associated with warm ENSO events, G. muellerae responds to warm PDO events and the abundance of G. ericsonii increases during cold PDO events. Morphometric parameters measured on E. huxleyi, G. muellerae and G. oceanica indicate increasing coccolithophore shell carbonate mass from ∼1917 until 2004 concomitant with rising pCO 2 and sea surface temperature in the region of the SBB.

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Recent changes in climate in the far western equatorial Pacific and their relationship to the Southern Oscillation; oxygen isotope records from massive corals, Papua New Guinea

Cited by 114 publications

References 25 publications

Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records

Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records

New views of tropical paleoclimates from corals

Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917–2004

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