解读古气候记录

解释冰芯如何保存远古空气气泡、同位素比率和火山喷发标记，从而重建80万年前的温度和二氧化碳水平；说明树木年轮、海洋沉积物岩芯、珊瑚骨骼和花粉记录等额外的气候代用指标；解释气候模型如何构建并对照古气候记录进行验证；描述IPCC综合数千项研究的科学证据以形成共识评估的过程。

Explain how ice cores preserve ancient air bubbles, isotope ratios, and volcanic markers allowing reconstruction of temperature and CO2 going back 800,000 years; describe tree rings, ocean sediment cores, coral skeletons, and pollen records as additional climate proxies; explain how climate models are built and validated against the palaeoclimate record; describe the IPCC process of synthesising scientific evidence across thousands of studies to produce consensus assessments

评估问题 / Assessment

{{name}}能解释科学家如何知道50万年前的气候是怎样的吗？自然界中有哪些保存着远古空气和温度记录的“时间胶囊”，科学家又是如何解读它们的？

Can {{name}} explain how scientists know what the climate was like 500,000 years ago — what kind of 'time capsules' exist in nature that preserve ancient air and temperature records, and how do scientists read them?