The stable carbon isotope composition (δ¹³C) in coral skeletons can be used to reconstruct the evolution of the dissolved inorganic carbon (DIC) in surface seawater, and its long-term declining trend during the past 200 years (∼1800-2000) reflects the effect of anthropogenic Suess effect on carbonate chemistry in surface oceans. The global atmospheric CO₂ concentration still has been increasing since 2000, and the Suess effect is intensifying. Considering the coral’s ability of resilience and acclimatization to external environmental stressors, the response of coral δ¹³C to Suess effect may change and needs to be re-evaluated. In this study, ten long coral δ¹³C time series synthesized from different oceans were used to re-evaluate the response of coral carbonate chemistry to Suess effect under the changing environments. These δ¹³C time series showed a long-term declining trend since 1960s, but the declining rates slowed in eight time series since around 2000s. Considering that the declining rates of the DIC-δ¹³C in surface seawater from the Hawaii Ocean Time-series Station and Bermuda Atlantic Time-series Station has not changed since 2000 compared with those during 1960-1999, the change in the coral δ¹³C trends at eight of ten locations may indicate that the response of coral δ¹³C to the anthropogenic Suess effect has changed since around 2000s. This change may have resulted from coral acclimatization to external environmental stressors. To adapt to acidifying oceans, coral may have the ability to regulate the source of DIC in extracellular calcifying fluid and/or the utilization way of DIC, therefore the response of coral δ¹³C to anthropogenic Suess effect will change accordingly.

稳定的碳同位素组合物（δ ¹³在珊瑚骨骼C）可以被用来重建在表面海水中溶解的无机碳（DIC）的演化，并且在过去的200年的长期下降趋势（~1800-2000）反映了人为的Suess效应对表层海洋碳酸盐化学的影响。自2000年以来，全球大气中的CO ₂浓度仍在增加，而Suess效应正在加剧。考虑弹性和驯化至外部环境的压力的珊瑚的能力，珊瑚δ的响应¹³ ℃到休斯效果可能改变，并且需要被重新评估。在这项研究中，十户长珊瑚δ ¹³使用来自不同海洋的C时间序列重新评估了变化的环境下碳酸钙化学对Suess效应的响应。这些δ ¹³ C时间序列显示，20世纪60年代以来长期下降趋势，但自2000年左右在八个时间序列的下降速率减缓。考虑到DIC-δ的下降率¹³从夏威夷海洋时间序列站和百慕大大西洋时间序列站并没有因为2000年一九六〇年至1999年改变那些相比，表层海水C，在珊瑚δ变化¹³在十个位置的8架C趋势可能表明珊瑚δ响应¹³自2000年代以来，人为的Suess效应的C发生了变化。这种变化可能是由于珊瑚适应了外部环境压力而造成的。适应海洋酸化，珊瑚可能必须调节DIC的细胞外钙化流体和/或DIC的利用方式的源极的能力，因此珊瑚δ的响应¹³将相应地改变C到人为休斯效果。