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- W1648771871 abstract "Abstract The sea surface temperature (SST) of the tropical Indian Ocean is a major component of global climate teleconnections. While the Holocene SST history is documented for regions affected by the Indian and Arabian monsoons, data from the near‐equatorial western Indian Ocean are sparse. Reconstructing past zonal and meridional SST gradients requires additional information on past temperatures from the western boundary current region. We present a unique record of Holocene SST and thermocline depth variations in the tropical western Indian Ocean as documented in foraminiferal Mg/Ca ratios and δ 18 O from a sediment core off northern Tanzania. For Mg/Ca and thermocline δ 18 O, most variance is concentrated in the centennial to bicentennial periodicity band. On the millennial time scale, an early to mid‐Holocene (~7.8–5.6 ka) warm phase is followed by a temperature drop by up to 2°C, leading to a mid‐Holocene cool interval (5.6–4.2 ka). The shift is accompanied by an initial reduction in the difference between surface and thermocline foraminiferal δ 18 O, consistent with the thickening of the mixed layer and suggestions of a strengthened Walker circulation. However, we cannot confirm the expected enhanced zonal SST gradient, as the cooling of similar magnitude had previously been found in SSTs from the upwelling region off Sumatra and in Flores air temperatures. The SST pattern probably reflects the tropical Indian Ocean expression of a large‐scale climate anomaly rather than a positive Indian Ocean Dipole‐like mean state." @default.
- W1648771871 created "2016-06-24" @default.
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- W1648771871 date "2014-05-01" @default.
- W1648771871 modified "2023-10-06" @default.
- W1648771871 title "Holocene tropical western Indian Ocean sea surface temperatures in covariation with climatic changes in the Indonesian region" @default.
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- W1648771871 doi "https://doi.org/10.1002/2013pa002555" @default.
- W1648771871 hasPublicationYear "2014" @default.
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