< p >我看着这短暂,发现值得指出的几件事。首先,EPA表看起来是基于表8的EPA pdf: < / p > < p > < a href = " https://www.epa.gov/sites/production/files/2018-03/documents/emission-factors_mar_2018_0.pdf " rel = " noreferrer " > https://www.epa.gov/sites/production/files/2018-03/documents/emission-factors_mar_2018_0.pdf < / > < / p > < p >注意表中,< / p > < blockquote > < p >空中旅行因素从2017年指南Defra /气候变化的温室气体转换因素来公司报道。2017年8月1.0版本。< / p > < /引用> < p >,有一个可爱的讽刺,<强>这EPA航空数字取自英国能源与气候变化部/ Defra < / >强,这是可用的:< / p > < p > < a href = " https://www.gov.uk/government/publications/greenhouse -气体报告-转换-因素- 2017“rel = " noreferrer " > https://www.gov.uk/government/publications/greenhouse -气体报告-转换-因素- 2017 < / > < / p > < p >注意,他们翻译的名字空中旅行距离分类意义在美国市场:< / p > < ul > <李>我们短途(& lt;300英里)=英国国内英国(英国)< /李> <李>美国中途(300 - 2300)=英国短途(& lt;李李3700公里)< / > < >美国长途(> 2300 mi) =英国长途(> 3700公里)< /李> < / ul > < p >从美国短途/英国国内一些数字作为一个例子,二氧化碳排放,< / p > < p > 0.14002 kgCO2e /通过公里= 140.02 gCO2e /公里= 225.3 gCO2e /传球mi < / p > < p >也就是基本单位转换和同意你的EPA表和EPA pdf。也是如此的二氧化碳排放在其他类别的距离。注意<强> EPA使用二氧化碳排放量没有辐射强迫的数字反馈< /强>从水蒸气,尾迹,氮氧化物,等等,这是深蓝色的部分情节来自BBC的酒吧。你应该比较,部分的排放,不完整的酒吧包括浅蓝色。< / p > < p >有进一步问题你EPA的甲烷和一氧化二氮值表。拿上面的例子一样但对CH4的排放,< / p > < p > 0.00006 kgCO2e / = 0.097公里= 0.06 gCO2e /传球公里gCO2e / mi = 0.0039 gCH4 /传球mi < / p > < p >这在EPA pdf是正确的,但<强> mis-transcribed在EPA表< /强> 3.9 gCH4 / mi。哦! someone got confused between grams and kilograms, and they've made the same mistake in the CH4 and N2O entries for all modes of transport. They’ve then used this to calculate the overall GWP column, so their values are oversensitive to CH4 and N2O: GWP = 225*1 + 3.9*25 + 7.2*298 = 2468.1
The correct calculation is,
GWP = 225*1 + 3.9e-3*25 + 7.2e-3*298 = 227
The bottom line is that I think the GWP column in your EPA table is nonsense and the aircraft emissions factors have the same source (albeit the BBC are probably using more recent UK emission factors). The respective CO2 emissions for cars in the sources I've linked to aren't wildly different (297 gCO2/mi in UK, 343 gCO2/mi in US) and for motorcycles are almost identical (183 gCO2/mi in UK, 189 gCO2/mi in US).