水合物与湿地对晚第四纪大气甲烷浓度变化影响的模型比较

doi:10.11978/j.issn.1009-5470.2012.05.008

Abstract

Abstract: There exist the widely accepted wetlands hypothesis and a new hydrate gun hypothesis, for the periodic changes of atmospheric methane concentration recorded in the Antarctic and Greenland ice cores. O'Hara tried to identify the probability of methane sources between gas hydrate and wetlands by model simulations with first-order kinetics. The results suggested that it is not wetlands but gas hydrate that may be the major source of the atmospheric CH₄. This paper checked the mathematical derivation and the model mechanism, then corrected the model and came up with distinguished new results. The best-fit modified model requires the methane concentration of 10 kg?m^-3 for marine gas hydrates or that of 1600 kg?m^-3 for wetlands. But no methane source with so high content is found in gas hydrate or wetlands. The results did not eliminate gas hydrate or wetlands as the primary CH4 source, but reflected that the model was a closed system for the CH4 source, which so needs high initial methane concentration. This model mechanism conflicts with the fact that both gas hydrates and wetlands develop as open systems.

Key words: gas hydrate, wetland, ice core, methane, model

CLC Number:

P736.41

ZHANG Hui,YAN Pin. Model comparison of the effect of gas hydrates and wetlands on the atmospheric methane concentration variation in late Quaternary[J].Journal of Tropical Oceanography, 2012, 31(5): 57-61.

References

[1] PETIT J R, JOUZEL J, RAYNAUD D, et al. Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica [J]. Nature, 1999, 399(6735): 429-436.
[2] BROOK E J, SOWERS T, ORCHARDO J. Rapid variations in atmospheric methane concentration during the past 110,000 years [J]. Science, 1996, 273(5278): 1087-1091.
[3] SPAHNI R, CHAPPELLAZ J, STOCKER T F, et al. Atmospheric methane and nitrous oxide of the late Pleistocene from Antarctic ice cores [J]. Science, 2005, 310(5752): 1317-1321.
[4] LOULERGUE L, SCHILT A, SPAHNI R, et al. Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years [J]. Nature, 2008, 453(7193): 383-386.
[5] CHAPPELLAZ J, BLUNIER T, RAYNAUD D, et al. Synchronous changes in atmospheric CH4 and Greenland climate between 40 and 8 ka [J]. Nature, 1993, 366: 443-445.
[6] KVENVOLDEN K A, LORENSON T D. The global occurrence of natural gas hydrates [M]// PAULL C K, DILLON W P. Natural gas hydrates, occurrence, distribution and detection. Washington D C: AGU, 2001: 3-18.
[7] KENNETT J P, CANNARIATO K G, HENDY I L, et al. Methane hydrates in Quaternary climate change: The clathrate gun hypothesis [M]. Washington D C: AGU, 2003: 216.
[8] BUFFETT B, ARCHER D. Global inventory of methane clathrate: Sensitivity to changes in the deep ocean [J]. Earth Planet Sci Lett, 2004, 227(3-4): 185-199.
[9] HESTER, K C, BREWER P G. Clathrate hydrates in nature [J]. Annu Rev Mar Sci, 2009, 1: 303.
[10] O'HARA K D. A model for late quaternary methane ice core signals: Wetlands versus a shallow marine source [J]. Geophys Res Lett, 2008, 35(2): L02712.
[11] VAGHJIANI G L, RAVISHANKARA A R. New measurement of the rate coefficient for the reaction of OH with methane [J]. Nature, 1991, 350: 406-408.
[12] MATTHEWS E. Wetlands [M]//KHALIL M A K. Atmospheric methane, its role in the environment. New York: Springer, 2000: 202-233.
[13] MILKOV A V, CLAYPOOL G E, LEE Y J, et al. In situ methane concentrations, at Hydrate Ridge, offshore Oregon: New constraints on the global gas hydrate inventory from an active margin [J]. Geology, 2003, 31(10): 833-836.
[14] 卢博, 李赶先, 黄韶健, 等. 中国黄海、东海和南海北部海底浅层沉积物声学物理性质之比较[J]. 海洋技术, 2005, 24(2): 28-33.
[15] DAVIE M K, BUFFETT B A. A numerical model for the formation of gas hydrate below the seafloor [J]. J Geoph Res, 2001, 106(B1): 497-514.
[16] BHATNAGAR G, CHAPMAN W G, DICKENS G R, et al. Generalization of gas hydrate distribution and saturation in marine sediments by scaling of thermodynamic and transport processes [J]. Am J Sci, 2007, 307(6): 861-900.
[17] DENMAN K L, BRASSEUR G, CHIDTHAISONG A, et al. Couplings between changes in the climate system and biogeochemistry [M] // SOLOMON S, QIN D, MANNING M, et al. Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge: Cambridge Univ Press, 2007: 499-587.

Model comparison of the effect of gas hydrates and wetlands on the atmospheric methane concentration variation in late Quaternary

PDF (PC)

Like

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Metrics

Comments

Recommended 0

[1]	ZHENG Fa, HUANG Fulin, CHEN Zeheng, DING Weipin. Mangrove wetland dynamics in Shankou, Guangxi based on LUCC and landscape pattern change [J]. Journal of Tropical Oceanography, 2024, 43(4): 165-173.
[2]	LI Junjie, QU Ke, WANG Xu. Three-dimensional numerical simulation of the influence of excavation pit on the hydrodynamic characteristics of solitary wave on fringing reef [J]. Journal of Tropical Oceanography, 2023, 42(6): 42-51.
[3]	WU Tongren, LIU Pei, YU Jitao, WEN Tingting. Comparative study on different tide level correction methods in remote sensing extraction of coastline under balanced profile model^* [J]. Journal of Tropical Oceanography, 2023, 42(6): 52-62.
[4]	CHEN Bo, QIN Zidong, WANG Feng, CAI Pingxiong, ZHANG Shengyin. Coupling characteristics of reduced inorganic sulfur and reactive iron in coastal acidic sulfate soil wetland and its environmental significance [J]. Journal of Tropical Oceanography, 2023, 42(5): 45-55.
[5]	LI Niu, DI Pengfei, FENG Dong, CHEN Duofu. The impact of cold seepage on geochemical indices for redox conditions of marine sediments ―Site F active seep site in the northeastern South China Sea^* [J]. Journal of Tropical Oceanography, 2023, 42(5): 144-153.
[6]	WANG Weiqiang, ZHANG Xiya, XU Kang, LI Junling, MIAO Haoyu. Assessment of El Niño diversity simulations using CMIP6 and CMIP5 models^* [J]. Journal of Tropical Oceanography, 2023, 42(2): 21-33.
[7]	YAN Jing, WEI Xing. Geomorphological changes and dynamic responses of the Huangmaohai Estuary in the Pearl River Delta [J]. Journal of Tropical Oceanography, 2023, 42(2): 9-20.
[8]	ZHANG Qi, LIAN Tao. Low-frequency wind stress forcing reduces El Niño diversity in numerical model [J]. Journal of Tropical Oceanography, 2023, 42(1): 1-9.
[9]	WANG Zihan, ZENG Cong, JIANG Ziyu, CAO Ling. Conservation gap analysis of threatened fish in the East China Sea and adjacent sea areas [J]. Journal of Tropical Oceanography, 2023, 42(1): 66-86.
[10]	LYU Hongke, GONG Yuanfa, WANG Guihua. A linear Markov model for the forecast of sea surface salinity in the Indian Ocean and its improvement method [J]. Journal of Tropical Oceanography, 2022, 41(6): 151-158.
[11]	SU Jinzhu, ZOU Jiashu, SU Yuping, ZHANG Mingfeng, WENG Zhenzhou, Yang Xiaoqiang. Study on the early warning model of red tide in the offshore area of Pingtan, Fujian province [J]. Journal of Tropical Oceanography, 2022, 41(4): 172-180.
[12]	DENG Guotong, LIU Mincong, XING Jiuxing, SHENG Jinyu, ZHOU Kai, CHEN Shengli. Analysis on the influencing factors of storm surges near Shenzhen [J]. Journal of Tropical Oceanography, 2022, 41(3): 91-100.
[13]	CHEN Kehai, XIE Xuetong, ZHANG Jinlan, ZHENG Yan. An SST dependent geophysical model function for HY-2A scatterometer [J]. Journal of Tropical Oceanography, 2022, 41(2): 90-102.
[14]	ZHANG Haoyu, QIU Xuelin, HUANG Haibo. Automatic search and non-uniqueness analysis of shear wave models from active Ocean Bottom Seismometer data [J]. Journal of Tropical Oceanography, 2022, 41(1): 194-203.
[15]	HONG Xiaofan, CHEN Zuozhi, ZHANG Jun, JIANG Yan’e, GONG Yuyan, CAI Yancong, YANG Yutao. Analysis of ecological carrying capacity of reef organisms in Qilianyu Islands based on Ecopath model [J]. Journal of Tropical Oceanography, 2022, 41(1): 15-27.