Respuesta :
Scientists use proxy methods to study past climates, using climate proxies to reconstruct climates that extend back further than our present instrumentation allows.
are historical physical traits that have been retained. They can be used in place of actual meteorological observations to help researchers reconstruct past climatic conditions over a longer period of Earth's history. Proxy measurements are the only way for scientists to identify climatic patterns prior to the establishment of reliable global climate records in the 1880s.
Many different geologic contexts have been used to study a huge number of climate proxies. Species composition of sub-fossil pollen in lake sediment or foraminifera in ocean sediments, temperature profiles of boreholes, stable isotope readings from ice cores, growth rates in tree rings, stable isotopes and mineralogy of corals, and carbonate speleothems are a few examples of proxies. Each time, the proxy indicator's growth or deposition was influenced by a specific seasonal climate parameter (such as summer temperature or monsoon severity). The calibration of the proxy's sensitivity to climate and cross-verification of proxy indicators are just two of the ancillary studies needed for the interpretation of climate proxies.
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