Insights into the Australian mid-Holocene climate using downscaled climate models

IF 3.8 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Climate of The Past Pub Date : 2024-05-08 DOI:10.5194/egusphere-2024-1211

Andrew L. Lowry, Hamish A. McGowan

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Abstract

Abstract. The mid-Holocene climate of Australia and the equatorial tropics of the Indonesian–Australian monsoon region is investigated using the Community Earth System Model (CESM) and the Weather Research and Forecasting (WRF) model. Each model is used to simulate the pre-industrial (1850) and the mid-Holocene (6000 years before 1950) climate. The results of these four simulations are compared to existing bioclimatic modelling of temperature and precipitation. The finer resolution WRF simulations reduce the bias between the model and bioclimatic data results for three of the four variables available in the proxy dataset. The model results show that temperatures over southern Australia at the mid-Holocene and pre-industrial period were similar, and temperatures were slightly warmer during the mid-Holocene over northern Australia and into the tropics, compared to the pre-industrial. During the mid-Holocene precipitation was generally reduced over northern Australia and in the Indonesian–Australian monsoon region, particularly during summertime. The results highlight the improved value of using finer resolution models such as WRF to simulate the palaeoclimate.

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利用降尺度气候模型洞察澳大利亚全新世中期气候

摘要利用群落地球系统模式（CESM）和天气研究与预报模式（WRF）研究了澳大利亚和印度尼西亚-澳大利亚季风区赤道热带地区的全新世中期气候。每个模型都用于模拟工业化前（1850 年）和全新世中期（1950 年前的 6000 年）的气候。这四种模拟的结果与现有的温度和降水生物气候模型进行了比较。在代用数据集提供的四个变量中，分辨率更高的 WRF 模拟减少了模型与生物气候数据结果之间的偏差。模型结果表明，全新世中期澳大利亚南部的气温与工业化前期相似，全新世中期澳大利亚北部和热带地区的气温比工业化前期略高。在全新世中期，澳大利亚北部和印度尼西亚-澳大利亚季风区的降水量普遍减少，尤其是在夏季。这些结果凸显了使用 WRF 等更精细分辨率模型模拟古气候的更高价值。

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来源期刊

Climate of The Past 地学-气象与大气科学

CiteScore

7.40

自引率

14.00%

发文量

120

审稿时长

4-8 weeks

期刊介绍： Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.