基于GCM的蒙古高原降水稳定同位素模拟

doi:10.13866/j.azr.2024.09.06

Abstract

Abstract:

This study used five atmospheric circulation models (GCM) from SWING2 and the second stable water isotope comparison group, to analyze the atmospheric water line equations of precipitation isotopes, spatial and temporal variations, and temperature relationships in the Mongolian Plateau. They were compared with the data from the Global Network for Isotope Observation and Information on Precipitation (GNIP), to provide detailed precipitation isotope information for the Mongolian Plateau, which lacks measurement stations. The results show that the local atmospheric water equation δD=7.783δ¹⁸O+3.011 simulated by LMDZ (ECMWF) was closer to the measured values; the δ¹⁸O and δD simulated by the five GCM models had significant seasonal variations, and the best simulation of their average monthly values were LMDZ (free) and LMDZ (ECMWF); and the results are based on the latitudinal effect. Only the CAM2 (free), LMDZ (ECMWF) and MIROC (free) models demonstrated the latitudinal effect in the Mongolian Plateau. In terms of longitude, the LMDZ (ECMWF) and isoGSM (NCEP) models showed that the δ¹⁸O values during precipitation in the western section of the region (87°-107°E) were higher than those in the eastern section (107°-127°E). Except for LMDZ (free), which demonstrated a weak temperature effect, others showed a robust impact. The LMDZ (ECMWF) model simulated the highest correlation coefficient between δ¹⁸O and temperature during precipitation in the two areas, with the strongest temperature effect.

Key words: GCM, precipitation, isotopes, Mongolian Plateau

LU Wenjing, QU Deye, YANG Mingyue, HUANG Hanlin, YANG Shanquan. GCM-based stable isotope modelling of precipitation in the Mongolian Plateau[J].Arid Zone Research, 2024, 41(9): 1491-1502.

Figures/Tables 12

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References 44

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GNIP站点	时期	δ¹⁸O记录数/个	δD记录数/个	δ¹⁸O/‰	δD/‰
乌兰巴托	1990—2001年	44	44	-14.10	-108.82
包头	1986—1992年	61	60	-8.27	-57.10

GCM模式	模式来源	空间分辨率	模拟方法
CAM2（free）	美国国家大气研究中心	2.81°×2.81°	AMIP标准
LMDZ（free）	法国气象动力实验室	3.75°×2.54°	AMIP标准
LMDZ（ECMWF）	法国气象动力实验室	3.75°×2.54°	ECMWF张弛逼近
isoGSM（NCEP）	日本东京大学	1.88°×1.90°	NCEP张弛逼近
MIROC（free）	日本东京气候系统研究中心	2.81°×2.79°	AMIP标准

	δ¹⁸O/‰				δD/‰
	最小值	月份	最大值	月份	最小值	月份	最大值	月份
GNIP	-21.90	12月	-5.22	5月	-170.13	12月	-42.15	5月
CAM2（free)	-28.23	12月	-5.69	6月	-223.56	1月	-43.43	4月
LMDZ（free)	-32.57	1月	-1.61	9月	-277.40	1月	-3.93	5月
LMDZ（ECMWF)	-28.11	12月	-1.07	5月	-204.71	12月	-15.19	6月
isoGSM（NCEP)	-41.01	1月	-18.47	6月	-311.38	1月	-136.46	6月
MIROC（free)	-29.57	12月	-5.02	5月	-236.56	12月	-36.50	4月

	乌兰巴托		包头
	温度效应	R	温度效应	R
GNIP	δ¹⁸O=0.45T-15.89	0.79	δ¹⁸O=0.39T-11.44	0.61
CAM2（free）	δ¹⁸O=0.29T-16.50	0.88	δ¹⁸O=0.23T-16.36	0.69
LMDZ（free）	δ¹⁸O=0.47T-14.94	0.91	δ¹⁸O=0.23T-10.69	0.75
LMDZ（ECMWF）	δ¹⁸O=0.44T-14.56	0.93	δ¹⁸O=0.38T-10.98	0.87
isoGSM（NCEP）	δ¹⁸O=0.43T-28.38	0.92	δ¹⁸O=0.34T-29.92	0.86
MIROC（free）	δ¹⁸O=0.33T-16.97	0.90	δ¹⁸O=0.33T-16.40	0.77

GCM-based stable isotope modelling of precipitation in the Mongolian Plateau

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