Climatic trends and interdecadal variability from south‐central Pacific coral records

Boiseau, Muriel; Ghil, Michael; Juillet-Leclerc, A.

doi:10.1029/1999gl900595

Cited by 33 publications

(21 citation statements)

References 18 publications

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“…For example, no sharp transition in D 14 C occurs in the mid-1940s at Hawaii (Druffel et al 2001), Australia (Druffel and Griffin 1993), Nauru (Guilderson and Schrag 1998b), or the Galapagos (Druffel 1981). However, in the south Pacific gyre, the 140-yr d 18 O record from a Moorea (17°30¢S, 149°50¢W) coral shows a strong interdecadal signal with warmer and/or less saline water in the SPG between 1940 and 1960 (Boiseau et al 1999). A D 14 C record from this site is not available.…”

Section: Synthesismentioning

confidence: 99%

“…The limited 1950-55 D 14 C record from the same Rarotonga coral is too short to discern a clear signal prior to 1955 (Guilderson et al 2000). In the available D 14 C coral records, (Boiseau et al 1999;Linsley et al 2000;Dunbar, unpublished). These findings suggest that decadal scale climate fluctuations may be more easily detected in the central Pacific than at its periphery.…”

Section: Synthesismentioning

confidence: 99%

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Decadal Timescale Shift in the ¹⁴C Record of a Central Equatorial Pacific Coral

Grottoli

Gille²,

Druffel³

et al. 2003

Radiocarbon

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ABSTRACT. Coral skeletal radiocarbon records reflect seawater D 14 C and are useful for reconstructing the history of water mass movement and ventilation in the tropical oceans. Here, we reconstructed the inter-annual variability in central equatorial Pacific surface water D 14 C from 1922-1956 using near-monthly 14 C measurements in a Porites sp. coral skeleton (FI5A) from the windward side of Fanning Island (3°54¢32²N, 159°18¢88²W). The most pronounced feature in this record is a large, positive shift in the D 14 C between 1947 and 1956 that coincides with the switch of the Pacific Decadal Oscillation (PDO) from a positive to a negative phase in the mid-1940s. Although the absolute D 14 C values from 1950-1955 in FI5A differ from the D 14 C values of another coral core collected from the opposite side of the island, both records show a large, positive shift in their D 14 C records at that time. The relative increase in the D 14 C of each record is consistent with the premise that a common mechanism is controlling the D 14 C records within each coral record. Overall, the Fanning D 14 C data support the notion that a significant amount of subtropical seawater is arriving at the Equator, but does not allow us to determine the mechanism for its transport.

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Section: Synthesismentioning

confidence: 99%

Section: Synthesismentioning

confidence: 99%

Decadal Timescale Shift in the ¹⁴C Record of a Central Equatorial Pacific Coral

Grottoli

Gille²,

Druffel³

et al. 2003

Radiocarbon

View full text Add to dashboard Cite

show abstract

“…Therefore, in order to estimate climatic variations over the last millennium, several temperature series have been constructed, using a single type of proxy, such as tree rings (Luckman et al, 1997;Esper et al, 2002), or using multi-proxy records (Jones et al, 1998;Mann et al, 1999;Crowley, 2000). Multi-proxy records extend the spatial coverage of climate reconstructions, typically using ice cores (Jones, 1996) for high latitudes, tree rings (Luckman et al, 1997;Esper et al, 2002) for mid-latitudes, and corals (Boiseau et al, 1999;Crowley, 2000) for low latitudes. Each of these proxies, however, reflects a different combination of temperature and precipitation effects and thus the interpolation and averaging over multi-proxy records (Jones et al, 1998;Mann et al, 1999;Crowley, 2000) may lead to spurious variations in the reconstructions (Jones, 1996;Esper et al, 2004;Von Storch et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Two millennia of climate variability in the Central Mediterranean

et al. 2009

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Abstract. This experimental work addresses the need for high-resolution, long and homogeneous climatic time series that facilitate the study of climate variability over time scales of decades to millennia. We present a high-resolution record of foraminiferal δ 18 O from a Central-Mediterranean sediment core that covers the last two millennia. The record was analyzed using advanced spectral methods and shows highly significant oscillatory components with periods of roughly 600, 350, 200, 125 and 11 years. Over the last millennium, our data show several features related to known climatic periods, such as the Medieval Optimum, the Little Ice Age and a recent steep variation since the beginning of the Industrial Era. During the preceding millennium, the δ 18 O series also reveals a surprising maximum at about 0 AD, suggesting low temperatures at that time. This feature contradicts widely held ideas about the Roman Classical Period; it is, therefore, discussed at some length, by reviewing the somewhat contradictory evidence about this period.We compare the δ 18 O record with an alkenone-derived sea surface temperature time series, obtained from cores extracted in the same Central-Mediterranean area (Gallipoli Terrace, Ionian Sea), as well as with Italian and other European temperature reconstructions over the last centuries. Based on this comparison, we show that the long-term trend and the 200-y oscillation in the records are temperature driven and have a dominant role in describing temperature variations over the last two millennia.

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“…To make up for the deficiency, other alternative data, such as tree rings and coral records, are used to study the climate change across the world. Boiseau and Ghil [3] studied the interdecadal climate change as described by the series of δ 13 C and δ 18 O records in coral. Cobb et al [4] probed into the relationship between the coral in the tropical central Pacific and interdecadal climate change over the equatorial Atlantic, Indian Ocean and Atlantic Ocean.…”

mentioning

confidence: 99%