Miocene fire intensification linked to continuous aridification on the Tibetan Plateau
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Geology (2019) 47 (4): 303-307
Although fire is considered an important factor in global vegetation evolution and climate change, few high-resolution Miocene fire records have been obtained worldwide. Here, two independent micro-charcoal–based fire records from the northern Tibetan Plateau were analyzed; both show similar trends in micro-charcoal concentrations through time, with low abundances in the warmer Middle Miocene Climate Optimum (18–14 Ma) followed by a continuous increase throughout the late Miocene (14–5 Ma) cooling. Our detailed statistical analyses show that the micro-charcoal concentration trend is highly positively correlated to the trend in oxygen isotopes (δ18O, r = 0.94) and xerophytic species (%Xero, r = 0.95). We propose that the intensified fire frequency on the Tibetan Plateau mainly originated from the forest-steppe ecotone as a result of the continuous aridification in winter driven by the global cooling and decreased atmospheric pCO2 that occurred during 18–5 Ma, with a secondary control by the tectonic activity of the northern Tibetan Plateau.
文章链接:https://pubs.geoscienceworld.org/gsa/geology/article-abstract/569037/miocene-fire-intensification-linked-to-continuous?redirectedFrom=fulltext
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