| YAN Hong,WANG Yuhong,SUN Liguang. 2014. High resolution oxygen isotope and grayscale records of a medieval fossil giant clam (Tridacna gigas) in the South China Sea：physiological and paleoclimatic implications. Acta Oceanologica Sinica, 33(8):18－25 |
| High resolution oxygen isotope and grayscale records of a medieval fossil giant clam (Tridacna gigas) in the South China Sea：physiological and paleoclimatic implications |
| High resolution oxygen isotope and grayscale records of a medieval fossil giant clam (Tridacna gigas) in the South China Sea：physiological and paleoclimatic implications |
| Received:December 26, 2012 Revised:June 16, 2013 |
| DOI：10.1007/s13131-014-0399-4 |
| Key words:Tridacna gigas oxygen isotope blue color intensity Medieval Warm Period sea surface temperature El Niño-Southern Oscillation |
| 中文关键词: Tridacna gigas oxygen isotope blue color intensity Medieval Warm Period sea surface temperature El Niño-Southern Oscillation |
| 基金项目:The National Basic Research Program of China (973 Program) under contract Nos 2010CB428902 and 2013CB955900;the National Natural Science Foundation of China under contract No. 41176042;the West Light Foundation of The Chinese Academy of Sciences under contract No. 29Y42909101;the Key Programs of the Chinese Academy of Sciences under contract No. 55ZZBS1304101. |
| Author Name | Affiliation | E-mail | | YAN Hong | State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China | | | WANG Yuhong | Advanced Management Research Center, Ningbo University, Ningbo 315211, China | | | SUN Liguang | Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China | slg@ustc.edu.cn |
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| Abstract: |
| Mollusks are well known for their detailed recording of paleoenvironmental and paleoclimatic changes in their carbonate shells. In this study, we constructed 18-year blue color intensity and oxygen isotope profiles of a 14C dated (AD 990±40) fossil giant clam, Tridacna gigas, from Shidao Island, South China Sea. The δ18O profile of the T. gigas specimen displayed regular annual cycles and was probably controlled by seasonal variations of the climatic parameters. The blue color intensity profile showed good agreement with the δ18O series, and both had 18 clear annual cycles in accordance with the 18 visually identified annual growth bands. The annual shell growth rate determined from the blue color intensity and oxygen isotope profiles indicated that the annual shell increment of the Tridacna specimen was stable after the onset of sexual maturity. Spectral analysis of the δ18O and blue color intensity time series suggested that the El Niño-Southern Oscillation (ENSO) period observed in the instrumental temperature and precipitation records of the South China Sea during the past 50 years also existed in medieval times. Our results showed that fossil giant clams could provide a good archive of historical intra-seasonal to decadal climate variations. |
| 中文摘要: |
| Mollusks are well known for their detailed recording of paleoenvironmental and paleoclimatic changes in their carbonate shells. In this study, we constructed 18-year blue color intensity and oxygen isotope profiles of a 14C dated (AD 990±40) fossil giant clam, Tridacna gigas, from Shidao Island, South China Sea. The δ18O profile of the T. gigas specimen displayed regular annual cycles and was probably controlled by seasonal variations of the climatic parameters. The blue color intensity profile showed good agreement with the δ18O series, and both had 18 clear annual cycles in accordance with the 18 visually identified annual growth bands. The annual shell growth rate determined from the blue color intensity and oxygen isotope profiles indicated that the annual shell increment of the Tridacna specimen was stable after the onset of sexual maturity. Spectral analysis of the δ18O and blue color intensity time series suggested that the El Niño-Southern Oscillation (ENSO) period observed in the instrumental temperature and precipitation records of the South China Sea during the past 50 years also existed in medieval times. Our results showed that fossil giant clams could provide a good archive of historical intra-seasonal to decadal climate variations. |
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