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Decadal to interdecadal variability in TEX86 temperature on the inner shelf of the East China Sea over the last 3.7 kyr
Organic Geochemistry ( IF 2.6 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.orggeochem.2020.104000 Yang Zhou , Xiuning Wu , Rong Xiang , Lei Xing
Organic Geochemistry ( IF 2.6 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.orggeochem.2020.104000 Yang Zhou , Xiuning Wu , Rong Xiang , Lei Xing
Abstract To understand the long-term environmental evolution of the East China Sea (ECS) and adjacent areas, the variation in TEX 86 H -derived sea surface temperature (SST) at site T08 collected from the mud area on the inner continental shelf of the ECS over the last 3725 years was reconstructed. The core-top TEX 86 H SST is 23.2 °C, close to the annual mean SST (22.9 °C) at site T08. The branched and isoprenoid tetraether (BIT) index, which is a proxy for soil organic matter, ranges from 0.029 to 0.059, indicating that the influence of terrestrial input on the TEX 86 H SST proxy is negligible. The ratio between glycerol dialkyl glycerol tetraethers (GDGTs) GDGT-0 and GDGT-5 (R0/5), which is used to indicate the contribution of methanogenic archaea to the GDGT pool, varies between 0.04 and 0.62, suggesting a minor influence of methanogens on the TEX 86 H proxy. During the past 3725 years, variation in TEX 86 H SST can be divided into three periods with an overall increasing trend. During Period I (3725–2500 yr BP), TEX 86 H SST ranged from 19.0 to 20.6 °C with a mean of 20.1 °C. The values were generally relatively low but with marked fluctuation, attributed to increased input of cold coastal water caused by a strengthened East Asian winter monsoon (EAWM) and a weakened Kuroshio Current (KC). During Period II (2500–750 yr BP), after a low-temperature period at 2400–2200 yr BP, TEX 86 H SST increased gradually from 19.2 to 23.5 °C. During this period, an intensified East Asian summer monsoon (EASM) and a strengthened KC and Taiwan Warm Current (TWWC) transported warm water from low-latitude areas to ECS coastal areas. During Period III (750 yr BP to present), TEX 86 H SST increased gradually and reached a maximum (24.2 °C) at ∼565 yr BP. Subsequently, TEX 86 H SST decreased and reached a low value (21.9 °C) at ∼279 yr BP. During the period ( TEX 86 H SST values were caused mainly by intensified KC, whereas lower values corresponded to the Little Ice Age. Spectral analysis reveals that variation in TEX 86 H SST exhibits periodicities of 175, 80, and 68 years, consistent with the periodicities of solar activity.
更新日期：2020-04-01
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