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VaughnA

I have mentioned the Air Pollution in World: Real-time Air Quality Index Visual Map previously on this blog.

https://aqicn.org/map/world/

One thing that I have particularly noticed is how much cleaner the air over China has become during the past 4 years. Yes, the air is cleaner in the summer but when I have compared seasonal data the winter data shows dramatic improvement with improvement during all seasons (sorry I do not have access to previous data at this time.)

Might this cleaner air also be a contributing factor to the heatwaves this summer?

I also need to mention the Arctic Sea Ice Forum for the continuing discussion on this topic: https://forum.arctic-sea-ice.net/index.php/topic,1384.0.html

Rob Dekker

Thanks Neven, and congrats on getting quoted in that article !
That's really cool !

I'd alway thought that aerosol had mostly a local cooling effect, so it is surprising that these guys (Mueller et al) find the signature of aerosol forcing in a regression model of Arctic sea ice decline. Very interesting, so it is unfortunate that their paper is under paid access.

Also, do you know if there is an overview of world wide aerosol emissions over the past 4 decades ? Has it reduced ? Or increased ? or stayed the same as the West reduced emissions while the East increased them ?

michael sweet

This is a free copy of Mueller et al:
https://dspace.library.uvic.ca/bitstream/handle/1828/7669/Mueller_Bennit_MSc_2016.pdf?sequence=1
Google Scholar shows free copies listed to the right hand side.

Neven, I rarely post here anymore but I read all the OP's and most of the comments. I think you do a great job of describing the main points of the melt season. If I want more detail I look at the forum. Keep up the good work!

michael sweet

This is a free copy of Mueller et al:
https://dspace.library.uvic.ca/bitstream/handle/1828/7669/Mueller_Bennit_MSc_2016.pdf?sequence=1
Google Scholar shows free copies listed to the right hand side.

Neven, I rarely post here anymore but I read all the OP's and most of the comments. I think you do a great job of describing the main points of the melt season. If I want more detail I look at the forum. Keep up the good work!

Rob Dekker

Thank you much, Michael, for finding that free copy of the paper.

I did not have enough time to read the paper in full yet, but just glancing over it, it seems to be a modeling exercise in CMIP5 models. Nothing wrong with that, but I wonder how they link it to actual observed sea ice decline (which is steeper than CMIP5 models predicted).

Allow me some time to read the rest of the paper and I will report back.

Rob Dekker

I reviewed the Mueller et al paper that is the basis of this ASIB post.
Here are the details :

https://forum.arctic-sea-ice.net/index.php/topic,1384.msg166919.html#msg166919

In summary : overall a great paper, with the notion that maybe they overestimated the influence of aerosols on Arctic Sea Ice extent by a factor of 1.7 - 1.8.

Zakelwe

If aerosols offset 23% of the value what percentage do more and more planes flying over Greenland and the Arctic do by making contrails /clouds ?

Is it bigger or smaller factor than aerosols?

Also planes emit a large amount of CO2 currently at the same time, so that has to be examined too.

Diablobanquisa

"Why six decades? Well the authors wanted to go back as far as they could while still accessing high-quality records of the ice extent. They used three different sets of data that record the extent of ice in the region."

One of the three data sets used by Mueller et al. is the one we published two years ago and that Neven kindly reblogged here: https://neven1.typepad.com/blog/2016/01/september-arctic-sea-ice-extent-1935-2014.html

(Journal article: https://doi.org/10.5281/zenodo.44756 , NetCDF file with the gridded data: https://doi.org/10.5281/zenodo.44757 , CSV file with the extent values: https://doi.org/10.5281/zenodo.44758)

Glad to see that our data are useful!

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