古气候模拟中古地理边界条件重建的不确定性研究<sup>*</sup>

doi:10.7605/gdlxb.2024.06.090

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Abstract

As climate models are increasingly applied in palaeoclimate studies,the reconstruction of more accurate palaeogeographic boundary conditions has become a key factor in understanding deep-time climate change mechanisms. However,the uncertainty in this reconstruction process has received little attention. This study investigates this uncertainty and its impact on model simulation results,based on reconstruction methods and data selection for palaeo-sea-land distribution,palaeo-sea depth,and palaeo-topography. Our results show that: (1)When reconstructing sea-land distribution,choice of reference plate movement models significantly affects the latitude and longitude of the reconstructed plates,so this demonstrate that model selection should align with research goals. Moreover,accurate correction of sea-land distribution requires multiple palaeoenvironmental proxy indicators,considering their uncertainties. (2)The reconstruction of palaeo-sea depth is more uncertain due to its complex process. Updating the oceanic crust age,choosing a depth-crust age relationship model,selecting a sediment model,and adjusting depth in key areas can all lead to different ocean depth reconstruction results. In particular,special attention should be paid to critical areas like sea channels,the state of this areas directly affect ocean current patterns and temperature-salinity changes in some ocean basins. (3)The uncertainty of palaeo-topography reconstruction is mainly influenced by factors such as the richness and uncertainty of height proxy indicators. (4)Correcting sea-land distribution and reconstructing sea depth leads to differences in basin size and seabed topography. These differences directly impact ocean currents and air-sea exchanges. In summary,uncertainty arises at every step of the palaeogeographic boundary conditions reconstruction process,which will greatly affect the accuracy of model output. To mitigate this,optimizing reconstructions by adding more proxy indicators will be required. Additionally,using multi-model results and geological records for verification is critical when analyzing climate model output,involving palaeogeographic boundary uncertainty.

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	Articles by authors
	ZHU Guangkun
	ZHANG Yurui
	QIN Guojin

Key words： palaeoclimate climate model palaeogeographic reconstruction palaeoclimate boundary conditions palaeoclimate modelling

Received: 07 October 2023

ZTFLH:

P532

Fund:

Natural Science Foundation Project of Xiamen Science and Technology Bureau(No.3502Z20227021)and the Special Project for Basic Research Business Expenses of Central Universities(No.20720210079)

Corresponding Authors: ZHANG Yurui,born in 1988,is an associate professor from Xiamen University. She is mainly engaged in research on palaeoclimate-palaeoocean. E-mail: yuruizhang@xmu.edu.cn.

About author: ZHU Guangkun,born in 1996,is a master degree candidate from Xiamen University. He is mainly engaged in research on palaeoclimate-palaeoocean simulation. E-mail: 22320211151395@stu.xmu.edu.cn.

Cite this article:

ZHU Guangkun,ZHANG Yurui,QIN Guojin. Uncertainty in reconstructing palaeogeographic boundary conditions in palaeoclimate modelling[J]. JOPC, 2025, 27(1): 195-208.

URL:

http://www.gdlxb.cn/EN/10.7605/gdlxb.2024.06.090 OR http://www.gdlxb.cn/EN/Y2025/V27/I1/195

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