DOI: 10.1175/JCLI-D-11-00533.1
Scopus记录号: 2-s2.0-84871902468
论文题名: Damage of land biosphere due to intense warming by 1000-fold rapid increase in atmospheric methane: Estimation witha climate-carbon cycle model
作者: Obata A. ; Shibata K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 24 起始页码: 8524
结束页码: 8541
语种: 英语
Scopus关键词: Agricultural productions
; Atmospheric CO
; Atmospheric methanes
; Biosphere-atmosphere interaction
; Boreal forests
; Carbon cycles
; Cycle model
; Global carbon cycle
; Heat stress
; High Latitudes
; Land biosphere
; Land plants
; Methane content
; Methane hydrates
; Net primary production
; Plant maintenance
; Surface air temperatures
; Tropical forest
; Wet conditions
; Atmospheric chemistry
; Biospherics
; Carbon
; Carbon dioxide
; Climate change
; Experiments
; Forestry
; Gas hydrates
; Global warming
; Hydration
; Maintenance
; Methanation
; Methane
; Tropics
; Vegetation
; Climate models
; atmosphere-biosphere interaction
; carbon cycle
; carbon dioxide
; climate change
; climate modeling
; global warming
; methane
; Carbon Dioxide
; Climates
; Estimation
; Experimentation
; Hydration
; Land Use
; Mathematical Models
; Methane
; Plants
; Tropics
; Embryophyta
英文摘要: Decadal-time-scale responses of climate and the global carbon cycle towarming associated with rapid increases in atmospheric methane from a massive methane release from marine sedimentary methane hydrates are investigated with a coupled climate-carbon cycle model.A 1000-fold methane increase (from<1 to 1000 ppmv) causes surface air temperatures to increase with a global warming of >6°C within 80 yr. The amount of carbon stored in the land biosphere decreases by >25%. This is mostly due to a large decrease in tropical net primary production during the first few years (~-40%), which is caused by a decrease in photosynthesis and an increase in plant maintenance respiration with the early warming of ~3°C, leading to tropical forest dieback (>20%) and the largest decrease in vegetation carbon of >50% (>80% of the decrease in global vegetation carbon). The decrease in global land carbon is also partly due to forestdiebacks (mainly boreal forest dieback by heat stress) at northern middle latitudes. In contrast, vegetation increases by>50% at northern high latitudes because of the amelioration to warm and wet conditions. Sensitivity experiments show that the warming of>6°C consists mainly of>5°C by the 1000-fold atmospheric methane and an additionalincrease of 1°C by the atmospheric CO2 increase due to the land CO2 release and that the CO2 fertilization of land plants prevents further warming of 1°C by limiting the atmospheric CO2 increase. The large decrease in land biomass estimated in this study suggests a critical situation for the land ecosystem or agricultural production, especially in the tropics. Because global methane content of marine methane hydrates is estimated at ~10 000 Gt, more intense warming leading to greater damage to the land biomass than the authors' experiment (~2000 Gt) is possible in the future methane release event that would be caused by the ongoing anthropogenic warming. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52117
Appears in Collections: 气候变化事实与影响
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作者单位: Meteorological Research Institute, 1-1 Nagamine, Tsukuba 305-0052, Japan
Recommended Citation:
Obata A.,Shibata K.. Damage of land biosphere due to intense warming by 1000-fold rapid increase in atmospheric methane: Estimation witha climate-carbon cycle model[J]. Journal of Climate,2012-01-01,25(24)