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热带西太平洋是全球海-气相互作用最强烈的区域,在地球气候系统中极为重要。为获得该海区末次冰盛期(LGM)海洋表层温度(SST)变化,以Ontong-Java海台WP7浮游有孔虫G.ruber为材料,结合其他站位,通过求解由G.ruber壳体镁钙元素比值(Mg/Ca)、壳体氧同位素(δ18Oc)和SST相互关系组成的方程组,排除了海水盐度对G.ruber壳体Mg/Ca的影响,对SST降幅进行了估算。结果表明,热带西太平洋LGM时期SST较晚全新世(LH)降幅达到了4.5℃,其中西太平洋暖池核心区(29℃等温线以内)约3.9℃,远大于以前的估算结果,但小于热带印度洋约5.8℃的结果,接近热带东太平洋约3.6℃的SST降幅,这可能是LGM时期西太暖池规模向东缩小的结果。
The tropical western Pacific Ocean is the region with the strongest sea-air interaction in the world and is extremely important in the Earth’s climate system. In order to obtain the change of ocean surface temperature (SST) at last ice age (LGM) in the sea area, Onto-Java WP7 planktonic foraminifera G.ruber was used as material in combination with other stations. The equations of Ca / Mg ratio, δ18Oc / SST relationship of the shell excludes the effect of seawater salinity on the Mg / Ca of G. ruber shell, and estimates the SST drop. The results show that the Late SST of the LGM during the tropical western Pacific reaches a 4.5 ° C decline. The core area of the western Pacific warm pool (within the 29 ° C isotherm) is about 3.9 ° C, which is much larger than the previous estimates but smaller than the tropical The result of the Indian Ocean about 5.8 ° C is close to the SST drop of about 3.6 ° C in the tropical eastern Pacific, which may be the result of an eastward shrinkage of the western Pacific warm pool during the LGM.