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Palaeoclimatic data refers to information about the Earth's past climate, which helps scientists understand long-term climate variability, natural climate drivers, and the context of current climate change. Since direct measurements of climate parameters such as temperature, precipitation, or atmospheric composition are available only for the past century or so, palaeoclimatic studies rely on indirect evidence or proxy data. These proxies provide insights into climate conditions over timescales ranging from decades to millions of years. The sources of palaeoclimatic data are diverse and can be broadly categorized into natural archives and geochemical records, each providing unique information about past climates. One important source of palaeoclimatic data is ice cores extracted from glaciers and polar ice sheets, particularly in Greenland and Antarctica. Ice cores preserve a chronological record of snowfall, which compacts into ice over thousands of years. Trapped within the ice are air bubbles containing ancient atmospheric gases such as carbon dioxide, methane, and nitrous oxide, which allow reconstruction of past greenhouse gas concentrations. Isotopic analysis, particularly of oxygen isotopes, enables estimation of past temperatures, as the ratio of heavy to light oxygen isotopes varies with ___ ______ ________ _____ ____ _____.
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