编辑-地球科学江南体育网页版堆栈交换江南电子竞技平台

你不是登录。你的编辑将被放置在一个队列,直到同行评议。

我们欢迎编辑,使读者更容易理解和更有价值。因为社区成员审查编辑,请尽量使文章更好比你怎么发现,例如,通过修正语法或添加额外的资源和超链接。

是农村的可见性(空气透明度)长在前工业化时期?

我的意思是气象能见度(根据维基百科,“衡量一个物体的距离或光线能够清晰把握。”)

之前,我想知道如果现代工业(pre -公元1800年)说,农村地区的能见度是超过今天(当然,在晴天条件下)。如果是这样的话,多少钱?

(当然在烟雾弥漫的城市能见度明显受到污染。我问关于农村地区。)

回答

工业化前就意味着大量的能源使用将木材燃烧的高效使用。我记得巴赫的付款在他的一个帖子是他的雇主提供的柴火,类似于“2 8白桦木材的绳索,绳索的桤木分裂....厨房使用我认为这个列表是大约15木一年的绳索。巴赫有一个很大的家庭,但即便如此。另一面:当然可以使用煤炭工业时代之初大幅笼罩了空气。看到伦敦的豌豆汤雾的记录。煤是用来在农场,但农场会稀释它的分散性质。我住在一个乡村地区许多人热冬天用木头,和一些煤。在这一点上,平均每平方英里的一个家庭就没什么影响。6英里之外是一个燃煤发电厂。 On a really bad day I can just barely see it's plume. The dust collection is pretty good. In pre-industrial times, farms averaged about 5 acres per family unit, about 100 times the current Alberta farm density, and 1000 times Saskatchewan's farm density. Ok: What are the contributors to visibility reduction: * Plant transpiration -- water vapour is a big one, but plants also put significant amounts of complex organics into the air. Most of the 'Blue Ridge" mountain haze is the result of plant activity. This will change depending on ground cover. Deciduous trees are more prone to this than grasses and forbs. * Dust from natural activities. Only occurs in climates dry enough that ground cover is incomplete. * Man made dust. Tillage in agriculture is the main cause of this, but watch any gravel road too. * Smoke from combustion. Much depends on how stuff is burned. Large particulates (e.g. diesel soot) fall out of the air column fairly quickly. My wild ass guess is that average visibility hit a minimum somewhere between 1930 and 1970 when tillage and coal use was at it's peak, but has since increased due to both less coal being burned, and better combustion design, along with increasing use of zero or minimal tillage in agriculture. You could get one check on this by looking at particulate measures in glacial ice.

编辑总结

取消

\ begingroup美元可能感兴趣的:nature.com/articles/041060c0,从1889年。(免费的PDF)。如果我理解正确的话,在农村(低人口、低污染)地区,能见度也可能不会恶化。 \ endgroup美元
- - - - - -nerdfever.com
2018年6月12日19:33

添加一个评论 |

正确的小错误或错误
澄清的意思,而不更改它
添加相关资源或链接
总是尊重作者的意图
不使用编辑与作者回复

创建代码用引号”或式子~篱笆
' ' '
像这样
' ' '
添加语言标识符来突出显示的代码
”“python
def函数(foo):
打印(foo)
' ' '
把段落之间的回报
在结束linebreak添加2个空间
_italic_或* *的* *
报价将>开始的
做链接(尽量使用https)
< https://example.com >
(例子)(https://example.com)
< a href = " https://example.com " > < / >示例
MathJax方程罪\ \ ^ 2θ美元

格式帮助»
回答帮助»

MathJax帮助»