ENSO variability around 2000 years ago recorded by Tridacna gigas δ 18 O from the South China Sea

Yan, Hong; Liu, Chengcheng; Zhang, Wenchao; Li, Ming; Zheng, Xiaoxu; Wei, Gangjian; Xie, Li; Deng, Wenfeng; Sun, Liguang

doi:10.1016/j.quaint.2016.05.011

Cited by 28 publications

(13 citation statements)

References 51 publications

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“…For the modern Tridacna sample, the δ 18 O values of 209 data points range from −3.31‰ to −1.92‰, with an average of −2.25 ± 0.20‰. These δ 18 O values are more negative than those from other Tridacna sample used in our previous study 23,35 , and this is caused by several outliers of δ 18 O values for the modern Tridacana XSN (Fig. 2a).…”

Section: Resultsmentioning

confidence: 68%

Holocene ENSO variability in the South China Sea recorded by high-resolution oxygen isotope records from the shells of Tridacna spp.

Shao

Mei

Yang

et al. 2020

Sci Rep

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The El Niño-Southern Oscillation (ENSO) is the principal climatic system in the modern Pacific Ocean, and it potentially influences the global climate. The South China Sea (SCS), in the western tropical Pacific, is significantly affected by ENSO activity. We have conducted a high-resolution oxygen isotope study of the shells of one modern and four fossil Tridacna from the Xisha islands in the ScS. the results for the modern sample reveal that the shells of Tridacna are a good proxy of enSo variability. We used the results of the oxygen isotope composition of four fossil Tridacna to produce high-resolution records of enSo activity during four time slices in the Holocene. the results indicate that enSo variability in the early Holocene was comparable to that of today, and that a minimum in the frequency and intensity of ENSO activity occurred in the mid Holocene. These findings are consistent with paleoclimatic results from corals, mollusks and sedimentary records. However, the observed extremely low frequency and moderate ENSO intensity at 4.7 ka indicate an anomalous pattern of ENSO changes within this interval of climatic transition. In addition, seasonal temperature variations during the Holocene were different from those of today and extreme seasonality may also occur during warmer periods.

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Section: Resultsmentioning

confidence: 68%

Holocene ENSO variability in the South China Sea recorded by high-resolution oxygen isotope records from the shells of Tridacna spp.

Shao

Mei

Yang

et al. 2020

Sci Rep

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“…Interannual climate changes in the Xisha Islands were likely dominated by ENSO activity, and the local SST anomalies may have reflected 76.47 % and 79.41 % on moderate El Ninõ and La Niña events, respectively (Liu et al, 2016). Previous studies demonstrated that the marine biogenic carbonate-based SST reconstructions in the northern South China Sea likely responded to ENSO activity (Sun et al, 2005;Yan et al, 2017). Warm/cold SST anomalies were related to El Ninõ/La Niña events.…”

Section: Enso Activity Recorded By Tridacna δ 18 Omentioning

confidence: 97%

“…Analyses on the Tridacna species were later introduced to make up this imperfection, due to their denser shells, negligible diagenetic alteration, and oxygen isotopic equilibrium with seawater. Recently, Yan et al (2014) proved that Tridacna species in the Xisha Islands could respond to ENSO activity, and then used fossil Tridacna δ 18 O in Dongdao Island (one of the islands in the Xisha Islands) to reconstruct ENSO variability around 2000 years ago (Yan et al, 2017).…”

Section: Enso Activity Recorded By Tridacna δ 18 Omentioning

confidence: 99%

Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago

Sun

Cheng

et al. 2019

Preprint

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Abstract. Tridacna is the largest marine bivalves in the tropical ocean, and its carbonate shell can shed light on high-resolution paleoclimate reconstruction. In this contribution, δ18Oshell was used to estimate the climatic variation in the Xisha Islands of the South China Sea. We first evaluate the sea surface temperature (SST) and sea surface salinity (SSS) influence on modern rehandled monthly (r-monthly) resolution Tridacna gigas δ18Oshell. The obtained results reveal that δ18Oshell seasonal variation is mainly controlled by SST and appear insensitive to local SSS change. Thus, the δ18O of Tridacna shells can be roughly used as a proxy of the local SST: a 1 ‰ δ18Oshell change is roughly equal to 4.41 °C of SST. R-monthly δ18O of a 40-year Tridacna squamosa (3673 ± 28 BP) from the North Reef of Xisha Islands was analyzed and compared with the modern specimen. The difference between the average δ18O of fossil Tridacna shell (δ18O = −1.34 ‰) and modern Tridacna specimen (δ18O = −1.15 ‰) probably implies a warm climate with roughly 0.84°C higher in 3700 years ago. The seasonal variation in 3700 years ago was slightly decreased compared with that suggested by the instrument data, and the switching between warm and cold-seasons was rapid. Higher amplitude in r-monthly and r-annual reconstructed SST anomalies implies an enhanced climate variability in this past warm period. Investigation of the El Ninõ-Southern Oscillation (ENSO) variation (based on the reconstructed SST series) indicates a reduced ENSO frequency but more extreme El Ninõ events in 3700 years ago.

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“…ENSO events are represented by a cold phase (La Niña) and a warm phase (El Niño), both responsible for considerable changes in the hydrological cycle. For example, changes in the frequency and intensity of intraseasonal or seasonal large‐scale events, such as monsoon and tropical cyclogenesis, may affect social, economic, and health dynamics worldwide (Beckage et al, ; Hilden, Huuki, Kivisaari, & Kopsakangas‐Savolainen, ; Palmer, ; Sánchez‐Murillo, Durán‐Quesada, Birkel, Esquivel‐Hernández, & Boll, ; Trenberth, Caron, Trenberth, & Caron, ; Tsonis, Hunt, & Elsner, ; Wrzesien & Wise, ; Yan et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…ENSO intensity has largely varied over time both in recent events as shown by the existing hydrometeorological networks worldwide (Fan, Meng, Ashkenazy, Havlin, & Schellnhuber, ; Mcphaden, ; Pezzi & Cavalcanti, ; Rao & Ren, ; Saulo, Nicolini, & Chou, ; Ward et al, ) as well as in palaeo‐archives (Cobb, Charles, Cheng, & Edwards, ; Deng et al, ; Driscoll et al, ; Wahl, Viscaino, Dunbar, & Anderson, ; Yan et al, ). These studies highlighted the need for a better understanding of hydrometeorological similarities and differences during different ENSO events, including their genesis, development, and the resulting impacts.…”

Section: Introductionmentioning

confidence: 99%

Isotopic composition of precipitation during strong El Niño–Southern Oscillation events in the Southeast Region of Brazil

Santos

Oliveira

Boll

et al. 2018

Hydrological Processes

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Equatorial Pacific sea surface temperature variations interact with processes of atmospheric circulation, creating conditions for the occurrence of El Niño-Southern Oscillation (ENSO). ENSO events represent the most important interannual phenomena affecting climate patterns worldwide and causing significant socio-economic impacts. In the Brazilian territory, ENSO leads to an increase in drought episodes in the north-eastern region and an increase in precipitation in the southern region, whereas the effects over the south-east region are yet not well understood. The main goal of this study is to compare variations of isotopic composition in precipitation across the south-east portion of the Brazilian territory during two very strong ENSO events: 1997-1998 (ENSO 1) and 2014-2016 (ENSO 2). Daily isotopic records, available from the Global Network of Isotopes in Precipitation database for ENSO 1, and samples collected during ENSO 2 were used to compare the influence of both events on the isotopic composition of precipitation. Seasonal variations indicated more depleted precipitation during the wet seasons (δ 18 O = −5.4 ± 4.0‰) and enriched precipitation during the dry seasons (δ 18 O = −2.8 ± 2.3‰). Observed rainfall variations were associated with atmospheric large-scale processes and moisture transport from the Amazon region, whereas extreme values (enriched or depleted) appear to be associated with particular convective and stratiform precipitation events. Overall, more depleted isotopic composition of precipitation (δ 18 O = −4.60‰) and higher d-excess (up to +15‰) were observed during the dry season of ENSO 1 when compared with ENSO 2 dry season (δ 18 O‰ = −2.80‰, d-excess lower than +14‰). The latter is explained by greater atmospheric moisture content, particularly associated with recycling of transpiration fluxes from the Amazon region, during dry season of ENSO 1. No significant differences for δ 18 O and δ 2 H were observed during the wet season; however, d-excess from ENSO 2 was greater than ENSO 1, due to the slightly greater atmospheric moisture content and very strong upward motion observed. Our findings highlight the opportunity that environmental isotopes offer towards understanding hydrometeorological processes, particularly, the evolution of extreme climatic events of global resonance such as ENSO.

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ENSO variability around 2000 years ago recorded by Tridacna gigas δ 18 O from the South China Sea

Cited by 28 publications

References 51 publications

Holocene ENSO variability in the South China Sea recorded by high-resolution oxygen isotope records from the shells of Tridacna spp.

Holocene ENSO variability in the South China Sea recorded by high-resolution oxygen isotope records from the shells of Tridacna spp.

Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago

Isotopic composition of precipitation during strong El Niño–Southern Oscillation events in the Southeast Region of Brazil

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ENSO variability around 2000 years ago recorded by Tridacna gigas δ 18 O from the South China Sea

Cited by 28 publications

References 51 publications

Holocene ENSO variability in the South China Sea recorded by high-resolution oxygen isotope records from the shells of Tridacna spp.

Holocene ENSO variability in the South China Sea recorded by high-resolution oxygen isotope records from the shells of Tridacna spp.

Evidence of intense climate variation and reduced ENSO activity from δ&lt;sup&gt;18&lt;/sup&gt;O of &lt;i&gt;Tridacna&lt;/i&gt; 3700 years ago

Isotopic composition of precipitation during strong El Niño–Southern Oscillation events in the Southeast Region of Brazil

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Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago