Quantifying the equatorial climate shifts in the Indo-Burma range using late Eocene–early Oligocene leaf fossils

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-04-03 DOI:10.1016/j.palaeo.2025.112931

Harshita Bhatia , Kapesa Lokho , Gaurav Srivastava , O. Chonchibeni Ezung

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Abstract

The late Eocene–early Oligocene geological time span saw significant Antarctic glaciation, which played a crucial role in shaping global climate patterns and influencing regional climates and ocean circulation changes. In this study, we quantitatively reconstructed the climate of a low latitude site using fossil leaf morphological traits recovered from the Laisong Formation (late Eocene–early Oligocene) of the Indo-Burma range. The Climate Leaf Analysis Multivariate Program was used to quantify the climate, suggesting a mean annual temperature of 25.3 ± 2.3 °C and a cold month mean temperature of 19.2 ± 3.5 °C. The length of the growing season extended throughout the year, with a mean annual precipitation of 244.2 ± 64.3 cm, showing clear rainfall seasonality between rainy summers (130 ± 40 cm) and dry winters (21.7 ± 9.8 cm). The study further reveals that high rainfall in the low latitude region resulted from the northward migration of the intertropical convergence zone due to Antarctic glaciation.

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用晚始新世-早渐新世叶片化石量化印缅地区赤道气候变化

始新世晚期至渐新世早期，南极冰川作用显著，对塑造全球气候格局、影响区域气候和海洋环流变化具有重要作用。本文利用印缅山脉晚始新世-早渐新世莱松组化石叶片形态特征，定量重建了该地区低纬度地区的气候。气候叶片分析多变量程序对气候进行量化，表明年平均气温为25.3±2.3°C，寒月平均气温为19.2±3.5°C。生长季节常年延长，年平均降水量为244.2±64.3 cm，夏季多雨（130±40 cm）和冬季干燥（21.7±9.8 cm）之间具有明显的降水季节性。研究进一步揭示了低纬度地区的高降水是由于南极冰川作用导致热带辐合带向北迁移所致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.