Пространственная реконструкция климата востока Азии в раннем эоцене

Abstract

Using the Coexistence Approach, climatic zones were identified for the Early Eocene of East Asia. Data for reconstruction include 48 palynofloras from the East Asia's Lower Eocene continental deposits from 75° to 19° N. The climatic inferences obtained are consistent with global trends, showing high values of mean annual temperature (MAT) and mean annual precipitation (MAP). According to our results, there is a weakly expressed latitudinal temperature gradient from the north to the south, showing an increasing trend for MAT values, while a very weakly expressed latitudinal gradient of precipitation demonstrates a decreasing trend for MAP values. Based on MAT and MAP values, three regional climatic zones are distinguished. The warm moderate climate zone (north of ≈ 55° paleolatitude) is characterized by low values for temperature (14.2-16.2 °C) and high ones for precipitation (1158-1334 mm). In the transition zone (≈ 45-55° paleolatitude), MAT values vary from 15.9 to 19.0 °C, and MAP values range from 874 to 1352 mm. The subtropical climate zone (south of ≈ 45° paleolatitude) is characterized by high values for temperature (16.5-19.1 °C) and low, for precipitation (874-1263 mm).