Assessing the Spatiotemporal Applicability of IsoGSM2 for Simulating Precipitation Isotope Compositions: A Multi-Timescale Analysis

IF 3.2 3区 地球科学 Q1 Environmental Science
Haichen Zhao, Liangju Zhao, Cong Xie, Keke Ma, Yuye Qin
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引用次数: 0

Abstract

Stable isotope in precipitation plays a crucial role in comprehending the water cycle. Isotope-enabled General Circulation Models (iGCMs) can continuously simulate the compositions of stable hydrogen and oxygen isotopes (δ2H and δ18O) in precipitation. The Isotope-incorporated Global Spectral Model Version 2 (isoGSM2), one of the iGCMs, has been widely used in related research. Here, we use the measured δ18O records (δ18OO) of 21 long-term monitoring stations from the Global Network of Isotopes in Precipitation and modelled δ18O (δ18OM) from isoGSM2 to compare δ18OM with δ18OO at different time intervals (monthly, annual) for the whole year (MD, AD), rainy season (RSM, RSA) and dry season (DSM, DSA). The results showed that isoGSM2 has good performance in the northern part of Oceania, southeastern Asia, central Europe, eastern North America, Greenland and northern South America across all temporal scales, but the correlations at the other stations vary depending on the timescale. The RMSE and correlation between δ18OM and δ18OO were better for the rainy season than for the dry season. The relationship between δ18OM and temperature was consistent with δ18OO for both the MD and RSM, as well as the relationship between δ18OM and precipitation amount for the MD. The deviation between simulated and observed values is associated with the accuracy of the model's simulation of rainfall and temperature, as well as the real environmental conditions. In addition, isoGSM2 may have a high correlation at sites where AO and ENSO are significantly affected. These findings are valuable for understanding isoGSM2's applicability and enhance the understanding and knowledge of stable isotopes in the water cycle.

Abstract Image

基于多时间尺度分析的IsoGSM2模拟降水同位素组成的时空适用性评估
降水中的稳定同位素在理解水循环中起着至关重要的作用。同位素支持环流模式(iGCMs)可以连续模拟降水中稳定的氢、氧同位素(δ2H和δ18O)的组成。同位素结合全球谱模型(isoogsm2)是igcm中的一种,已广泛应用于相关研究。本文利用全球降水同位素网络21个长期监测站的实测δ18O记录(δ18OO)和isoGSM2模拟的δ18O (δ18OM),比较了全年(MD、AD)、雨季(RSM、RSA)和旱季(DSM、DSA)不同时间间隔(月、年)的δ18OM和δ18OO。结果表明,isoGSM2在大洋洲北部、东南亚、中欧、北美东部、格陵兰岛和南美洲北部各时间尺度上均有较好的表现,但其他台站的相关性因时间尺度而异。雨季的RMSE和δ18OM与δ18OO的相关性好于旱季。MD和RSM的δ18OM与温度的关系与δ18OO的关系基本一致,MD的δ18OM与降水量的关系也基本一致。模拟值与观测值的偏差与模式对降水和温度的模拟精度以及实际环境条件有关。此外,在AO和ENSO受到显著影响的位置,isoGSM2可能具有较高的相关性。这些发现对于理解isoGSM2的适用性,增强对水循环稳定同位素的认识和认识具有重要意义。
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
Hydrological Processes
Hydrological Processes 环境科学-水资源
CiteScore
6.00
自引率
12.50%
发文量
313
审稿时长
2-4 weeks
期刊介绍: Hydrological Processes is an international journal that publishes original scientific papers advancing understanding of the mechanisms underlying the movement and storage of water in the environment, and the interaction of water with geological, biogeochemical, atmospheric and ecological systems. Not all papers related to water resources are appropriate for submission to this journal; rather we seek papers that clearly articulate the role(s) of hydrological processes.
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