为什么高海拔的飞机排放对气候的影响更大?-地江南体育网页版球科学堆栈交换江南电子竞技平台 最近30个来自www.hoelymoley.com 2023 - 03 - 27 - t15:01:32z //www.hoelymoley.com/feeds/question/9818 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/9818 9 为什么高海拔的飞机排放对气候的影响更大? 怀驹的 //www.hoelymoley.com/users/7619 2017 - 03 - 03 - t01:01:29z 2017 - 04 - 05 - t07:07:59z 我正在试着了解一架飞机的足迹。首先,维基百科说(没有引用来源):

目前认为,无论海拔高度如何,二氧化碳排放的水平和影响大致相同。< / p >

But then there are numerous references to radiative forcing, which is supposedly almost doubling the effects of the emissions (at this point only co2, or also NOx and others?). These are never explained (it says "see below" once, but there follows no explanation below.

The article on radiative forcing says that

Typically, radiative forcing is quantified at the tropopause in units of watts per square meter of the Earth's surface.

However this does not seem to explain why quantifying it "at the tropopause" makes sense, or what that means, since the measure given is measured on the surface. Does this imply that emissions below / above the tropopause are not considered contributing to radiative forcing? (I presume they are.)

Also, how come that emissions at greater heights force more? After all, at lower heights the same amount can cover a greater surface area at the same thickness / density. Maybe, the change in wavelength of incoming radiation is greater since the traveled distance is greater, and thus more is absorbed?

Lastly, does CO2 not ascend after being emitted at surface level, such that it will enter the stratosphere just as well as if it is emitted there? Or are there further factors partially mitigating this?

You can see I have too many questions, and find the Wikipedia articles very unrevealing / lacking.

Thank you!

//www.hoelymoley.com/questions/9818/-/9819#9819 1 为什么飞机在高海拔地区排放的废气对气候的影响更大? f.thorpe //www.hoelymoley.com/users/543 2017 - 03 - 03 - t06:11:39z 2017 - 03 - 03 - t06:11:39z

检查https://en.wikipedia.org/wiki/Environmental_impact_of_aviation。平流层附近/空中飞机上的氮氧化物增加了臭氧的形成,加上气溶胶有助于形成尾迹……这两者都加剧了气候变暖。如果飞机的排放不在平流层,那么那些非二氧化碳排放的化学物质和寿命就不会那么强大。< / p >

//www.hoelymoley.com/questions/9818/-/10056#10056 4 为什么飞机在高海拔地区排放的废气对气候的影响更大? user7733 //www.hoelymoley.com/users/7733 2017 - 04 - 05 - t07:07:59z 2017 - 04 - 05 - t07:07:59z 最初的大气层理论假设它是“混合良好的”。你会在许多文章中看到这个术语,也会看到它是一个假设。历史上对二氧化碳浓度的测量非常零星,除了莫纳罗亚火山。从该观测站获得的原始数据和为产生平滑曲线而进行的调整是有指导意义的,以查看每年的变化。还要注意因植物而产生的每日变化。美国宇航局于2014年发射了一颗卫星来测量大气中的二氧化碳含量,因此现在有证据表明二氧化碳没有很好地混合,但我们没有足够的数据来观察长期趋势,因为它甚至还没有给我们3年的数据。似乎有人声称,燃烧化石燃料产生的约40%的二氧化碳会随着二氧化碳浓度的增加而显现出来。其余的必须去其他地方(或者我们计算错了!)。通常认为有30-40%进入了海洋。虽然我看到有人声称地球在过去40年里变绿了约18%(集约化农业的增加),但在计算大气中二氧化碳增加的比例时,我还没有看到这一来源增加的二氧化碳被考虑在内。 At a first examination this would seem to be quite important. If the 18% greening is responsible for a significant percentage of CO2 increase then clearly fossil fuel CO2 is less important. This looks like an important area that needs to be looked at. Maybe careful study of satellite data over green areas compared to deserts/ice will reveal something.

Baidu
map