ENSO与火山活动的共同作用对大气CO2浓度年际变化的影响
投稿时间: 2016-11-25  最后修改时间: 2017-05-02  点此下载全文
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作者单位E-mail
陈中笑 南京信息工程大学大气科学学院 czxchen@nuist.edu.cn 
魏文豪 南京信息工程大学海洋学院  
基金项目:南京信息工程大学科研基金;海洋公益行业专项2015g016-2
中文摘要:作为全球碳循环研究的重要信号,大气CO2浓度的年际变化主要与厄尔尼诺和南方涛动(ENSO)有关,而火山活动的影响多关注Pinatubo火山喷发后的变化。本文利用Mauna Loa和南极站点月均观测大气CO2和13C资料分析了大气CO2浓度的年际变化特征,发现大气CO2浓度年际变化与ENSO呈正相关而与火山喷发指数呈负相关,大规模火山喷发能够降低强ENSO对大气CO2浓度的年际变化的影响,不仅与喷发强度有关,还与喷发规模和持续作用时间有关。ENSO与火山喷发共同影响大气CO2浓度年际变化,而分析期间内的El Chichon和Pinatubo喷发后大气CO2和13C年际变化的差异则受ENSO和火山喷发的强度以及两者的相对起始时间的影响。13C 分析结合Keeling Plot计算表明ENSO对大气CO2浓度年际变化的影响主要通过影响陆地生态系统生产量变化,而火山喷发对其影响则通过因温度降低和海洋施肥效应引起的海洋吸收增加。
中文关键词:大气CO2  ?13C  年际变化  ENSO  火山喷发
 
The Combined Impacts of ENSO and Volcanic Eruptions on the Interannual Fluctuations of Atmospheric CO2
Abstract:The interannual fluctuations of atmospheric CO2 (IFAC), as an important signal of global carbon cycle researches, is highly related to the El Niño-Southern Oscillation (ENSO). But most studies on the impact of volcanic activities merely focus on the post-Pinatubo eruption. By using monthly observational data of atmospheric CO2 and 13C at Mauna Loa and South Pole from 1959 to 2008, this study analyzes the features of IFAC. Positive correlation is found between IFAC and ENSO, and negative correlation between IFAC and volcanic eruption index. The massive eruptions could reduce the impact from strong ENSO on IFAC. The influence of volcanic activities is not only related to the eruption intensity, but related to the magnitude of eruptions and duration of eruption effects. ENSO and volcanic eruption work together on the IFAC. During analyzing periods, the diversity of atmospheric CO2 and 13C variations after El Chichon and Pinatubo eruptions are related to the relative beginning time of the both events. Using 13C analysis and Keeling Plot calculation, ENSO exerts influence on IFAC through the changes of terrestrial biosphere, and volcanic eruption, through oceanic uptake enhanced by the cooling and fertilization effects.
keywords:Atmospheric CO2, ?13C, Interannual fluctuations, ENSO, Volcanic eruption
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