末次间冰期早期植被对气候反馈作用的模拟研究  

MODELLING THE IMPACT OF BIOGEOPHYSICAL FEEDBACKS IN THE EARLY LAST INTERGLACIAL

作　　者：李焕 陈春珠 杨子腾 夏宇欣 张以恒 赵文伟 LI Huan;CHEN Chunzhu;YANG Ziteng;XIA Yuxin;ZHANG Yiheng;ZHAO Wenwei(School of Geographic Science,Nantong University,Nantong 226019,Jiangsu)

机构地区：[1]南通大学地理科学学院,江苏南通226019

出　　处：《第四纪研究》2023年第4期989-998,共10页Quaternary Sciences

基　　金：国家重点研究发展计划项目(批准号:2022YFF0801504);国家自然科学基金项目(批准号:42101146);江苏省自然科学基金项目(批准号:BK20210848)共同资助。

摘　　要：准确理解地质历史时期气候变化的现象和机制,对预测未来气候变化有重要的启示意义。末次间冰期早期是研究未来气候变化可参考的典型暖期。目前,基于气候模式模拟的末次间冰期早期温度低于气候记录重建的结果。这一现状的一个潜在原因在于,这些气候模拟研究中采用的植被数据为工业革命前水平,忽略了植被动态对气候的反馈作用。本研究利用iLOVECLIM气候模式耦合植被模块VECODE和LPJ-GUESS开展末次间冰期早期(125 ka B. P.)植被动态对气候反馈作用的模拟分析。模拟结果显示,相比基于工业革命前植被条件模拟得到的温度水平,耦合动态植被模拟的全球气候更温暖,但仍略低于记录重建的温度。在大陆/亚大陆尺度,高纬和北非地区模拟的125 ka B. P.植被覆盖度明显高于工业革命前水平,增温幅度也显著高于其他地区;此外,末次间冰期早期北非植被覆盖对区域气温的正反馈通过增强的大气环流使低纬地区输送到高纬地区热量增加,从而表现出对全球气温的正反馈作用。Understanding the phenomena and mechanisms of climate change in geological history is crucial for accurately predicting future climate change.The early last Interglacial is a typical warm period that can be referred to studies of future climate change.Previous climate model simulations of the early Last Interglacial(LIG)underestimated reconstructed temperature.One potential reason for this underestimation is that vegetation was prescribed to a pre⁃industrial state in most of previous simulations,thereby ignoring the impacts of dynamic vegetation feedbacks on climate.In this study,we performed a series of model experiments using the iLOVECLIM climate model,in which either VECODE or LPJ⁃GUESS model was coupled as vegetation component to simulate the effect of vegetation dynamics on climate in the early LIG.Our results suggest dynamic vegetation increases the consistency of temperature between simulations and proxy⁃based reconstructions in the early LIG,although the simulated temperature is still slightly lower than that reconstructed from proxy records.The simulated 125 ka B.P.vegetation covers are significantly greater than the pre⁃industrial level in northern high latitudes and North Africa,and temperature anomalies are larger in both regions due to positive vegetation feedbacks comparing to other regions.In addition,compared to desert,the vegetated Sahara positively affects global climate via enhanced atmospheric circulation during the early LIG,leading to increased heat transported from low latitudes to high latitudes.

关 键 词：末次间冰期 植被反馈作用 iLOVECLIM LPJ-GUESS 气候模拟 

分 类 号：P467[天文地球—大气科学及气象学]