Poster Number 87
See more from this Division: General Discipline Sessions
See more from this Session: Paleontology (Posters) III - Sclerochronology: Geoarchaeology, Climate and Environment
Abstract:
The δ13C and δ18O values of NW_M shell are between 0.57 and 1.61 (1.12 ± 0.19; mean ± 1σ; N = 143) and between -2.88 and -0.94 (-1.69 ± 0.40), respectively. The δ18O values of NW_M shell are generally in equilibrium with ambient seawater between 2000 and 2001. Four exceptions with lower δ18O values (< mean - 2σ) of NW_M shell can be related to heavy rainfall events during typhoons that affected southern Taiwan between 2000 and 2001. The δ18Oshell records observed in summer of 2002 are 0.3 greater than the expected δ18Oshell values for normal years. In addition, seasonal amplitude in δ18Oshell values was reduced. This variation may indicate an enhanced Kuroshio Current which brought relatively 18O enriched seawater into Nawan Bay in association with ENSO events.
Based on NW_M study, we recognized heavy rainfall events in KT_S01 and KT_S02 δ18Oshell records and ENSO events in KS_S, KT_S01, KT_S02, and KT_S03 δ18Oshell records. According to the proxies for the strength of the Asia monsoon of Lake Huguang Maar (Yancheva et al., 2007: Nature, v. 445, p. 74), these archaeological shells lived during the wetter climate/stronger summer monsoon condition. It may imply that the prehistoric human activity in southern Taiwan were mainly under the stronger Asia summer monsoon condition.
See more from this Division: General Discipline Sessions
See more from this Session: Paleontology (Posters) III - Sclerochronology: Geoarchaeology, Climate and Environment