在哪種位置可能會發現更多或更少的臭氧?


1

我一直在查看臭氧的空氣質量監測結果,並試圖理解為什麼兩個地點之間會有這種差異。在繁忙的道路,大海,工廠附近?

不過我很困惑!

Salford監控-監控器位於20米處,靠近高速公路(M60),並靠近其他一些大型道路和交叉路口。它的年平均為31(相當低)。

倫敦的臭氧含量非常低(21、25、30、32、38、45、48),曼徹斯特·皮卡迪利(29)也是如此

諾福克郡的西伯頓(Sibton)臭氧含量高,它遠離繁忙的道路,離大海11公里,處於非常農村的地區(58)。

伯明翰阿科克斯格林(Bockingham Acocks Green)的臭氧含量也很高(51),它遠離大海,海拔134m(對於英國城鎮而言是相當高的!),在郊區,與中等A公路相距500m。

海洋之間似乎存在某種相關性,但與交通無關,即使每個人都說來自臭氧的交通產生的二氧化氮。

即使倫敦看上去還很低,結果也很奇怪,肯辛頓(Kensington)有48個,但馬里波恩(Marylebone)有22個(相距僅4公里)。塔姆哈姆雷特米爾沃爾公園就在公園附近,泰晤士河是45,而塔姆哈姆雷特黑牆在繁忙的馬路旁邊是25(它們之間只有2.9公里)。

2

In what type of location is it likely to find larger or smaller amounts of ozone?

Using data from the 2017 Tropospheric Ozone Assessment Report we can answer the first part of the question. There's a massive database of images and plots available, from which I pulled just a few.

Here's a full image to include the legend and caption:

50th percentile ozone value, annual average 2010 to 2014

Now I'll focus just on the UK since that's what you've asked about. From left to right:

  • Rural, high elevation sites
  • Rural, low elevation sites
  • Urban sites
  • Non-urban sites

50th percentile ozone value, annual average 2010 to 2014, UK

Based on these maps, the higher concentrations appear to be in rural, coastal sites. There is only one high-elevation site in the UK, but it also has a higher relative concentration, consistent with high-elevation sites in other countries.

Why is the concentration different between locations?

According to Wikipedia:

Motor vehicle exhaust, industrial emissions, and chemical solvents are the major anthropogenic sources of these ozone precursors. Although the ozone precursors often originate in urban areas, winds can carry NOx hundreds of kilometers, causing ozone formation to occur in less populated regions as well.

In the UK, the prevailing winds are from the south and west (source), and population is densest roughly in the south and east:

Night-time map of the UK

This means we'd expect to see ozone concentrations roughly north and east of population centers, which is consistent with the maps.