Quantitative estimation of global mean precipitation throughout the Phanerozoic era  

作　　者：Xiujuan BAO Yongyun HU 

机构地区：[1]Laboratory for Climate and Ocean-Atmospheric Studies,Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871,China

出　　处：《Science China Earth Sciences》2024年第5期1616-1624,共9页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.41888101);the China Postdoctoral Science Foundation(Grant No.2023T160005)。

摘　　要：Quantitatively estimating the global mean precipitation(GMP)throughout Earth's history is crucial for enhancing our understanding of long-term climate evolution and the hydrological cycle.However,currently there is no established methodology for estimating global mean paleoprecipitation.Here,we present the first study that estimates GMP in the Phanerozoic era.The relationship between GMP and global mean surface temperature(GMST)is investigated by analyzing data from 23 models in the Coupled Model Intercomparison Project phase 6(CMIP6).The result reveals consistent and significant impact of temperature on precipitation,with a sensitivity range of 2–3%K^(-1).Additionally,we propose a method for accessing latitudinal variations in precipitation caused by land area distributions and paleo-Koppen climatic belts.These climatic belts are determined based on geological indicators such as coals,evaporites,and glacial deposits.The GMP is thus quantitatively estimated by combining variations in GMST,land area distributions,and paleo-koppen climatic belts,spanning from 540 Ma to the present day.The quantitative GMP curve demonstrates fluctuations in GMP about 500 mm yr^(-1),with values ranging from 948 to1442 mm yr-1over the Phanerozoic era.This curve aligns closely with findings derived from numerical simulations.The presented paleoprecipitation variations facilitate a more comprehensive understanding of the interconnected geological and paleoclimatic developments.

关 键 词：Paleoprecipitation PALEOCLIMATE K?ppen climatic belts Global mean precipitation Hydrological cycle 

分 类 号：P532[天文地球—古生物学与地层学] P534.4[天文地球—地质学]