结合大气反演模型和动态全球植被模型, Schimel等人[324]认为CO2施肥效应对当前碳汇贡献可高达60%. Fernández-Martínez等人[325]进一步发现在1995~2014年间, 大气CO2浓度升高使全球陆地NEP增加3.1~8.1 Pg C/100 ppm. 最近的一项研究认为, 1982~2015年间CO2施肥效应对全球大部分陆地生态系统总初级生产力(...
Francis Menton It was only a few weeks ago when the UN’s International Energy Agency issued its Report on“CO2 Emissions in 2021.”(The Report does not bear a precise date, but only “March 2022.”) I covered the IEA’s Report inmy previous post a few days ago. The Report gi...
(2019) revealed that elevated atmospheric CO2 concentrations increased global terrestrial NEP by 3.1–8.1 Pg C/100 ppm during 1995–2014. In contrast, a recent study suggested that the effect of CO2 fertilization on gross primary productivity (GPP) decreased in most terrestrial ecosystems ...
London’s plan (updated in 2022) when the choice of whether to build decarbonized heat grids or a massive roll out of heat pumps may emerge by 2025. San Francisco’s
(by month) and to plot them. To calculate the trends by 2050AD, the derived slope for each month and each time-span trend was multiplied by 424 months (after August 2014, there are only 424 full months until January 1, 2050AD). HadCRUT4 global dataset and CO2 (ppm) datasets used ...
Global warming is accelerating – the facts • Since the Industrial Revolution, which introduced machinery powered by coal and gas, atmospheric CO2 concentration has increased by about 40%, to above 400 parts per million (ppm).11 Current CO2 levels are 100 ppm higher than at any time in ...
Human emissions of greenhouse gases have increased atmospheric concentrations of CO2, methane and nitrous oxide to their highest levels in at leasta few million years— if not longer. The figure below shows concentrations of these greenhouse gases — inparts per million(ppm) for CO2 (blue line)...
2011). CO2 is also produced through the combustion of carbon products such as fuel. The global average outdoor CO2 concentration was reported to be around 415 ppm in 2021 (NOAA, 2023). CO2 concentrations in occupied indoor spaces are higher due to occupants’ respiration and other CO2 ...
ArticleOpen access19 April 2022 Introduction Since 2007, when a seminal publication1highlighted the relevance of inland waters for the global carbon cycle, estimates of CO2evasion fluxes from the world’s streams, rivers, and lakes to the atmosphere have continuously moved upwards2. Current estimates...
in the past 100 years. Notice, however, the spike at 1998, when the El Niño event took place in the Pacific Ocean, and then the subsequent drop in sea level that persisted for the next five years. Obviously, factors other than CO2levels were responsible for both the sp...