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Stephan

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Trends in Atmospheric SF6
« on: October 04, 2019, 07:27:49 PM »
NOAA has created a new site "Trends in Atmospheric SF6" on its website.
It reports monthly about the actual SF6 concentrations at sea level. SF6 is a very powerful GHG and per kg 26,087-fold more intense than CO2; converted into molar activity the factor is 86,678. I translated the CO2 equivalent into the concentration graph. It is not much (we talk about ppt concentrations), but more than nothing, and constantly increasing (higher than linearly = acceleration).

The latest value is for May 2019:
May 2019:     9.90 ppt
May 2018:     9.55 ppt
Last updated: September 18, 2019

The annual increase is 0.35 ppt, above all average annual increase rates (see below)
Annual increase rates (averaged over 5 years):
1998-2003: 0.20 ppt
2003-2008: 0.24 ppt
2008-2013: 0.29 ppt
2013-2018: 0.33 ppt
See attached graphs (concentration and increase rates, expressed as percentage)

Link to the website: https://www.esrl.noaa.gov/gmd/ccgg/trends_sf6/
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blumenkraft

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Re: Trends in Atmospheric SF6
« Reply #1 on: October 04, 2019, 08:43:17 PM »
Quote
Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, non-flammable, non-toxic but extremely potent greenhouse gas, and an excellent electrical insulator. SF 6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule. Typical for a nonpolar gas, it is poorly soluble in water but quite soluble in nonpolar organic solvents. It is generally transported as a liquefied compressed gas. It has a density of 6.12 g/L at sea level conditions, considerably higher than the density of air (1.225 g/L).

Link >> https://en.wikipedia.org/wiki/Sulfur_hexafluoride
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kassy

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Re: Trends in Atmospheric SF6
« Reply #2 on: October 04, 2019, 10:03:04 PM »
Quote from: kassy on September 15, 2019, 01:27:27 AM
This is also related to renewable energy:

Quote from: AbruptSLR on September 14, 2019, 12:42:11 AM
Per the linked article, sulfur hexafluoride, is the most powerful GHG known to man, and its emissions have been rising rapidly in recent years:

Title: "Climate change: Electrical industry's 'dirty secret' boosts warming"

https://www.bbc.com/news/science-environment-49567197

Extract: "It's the most powerful greenhouse gas known to humanity, and emissions have risen rapidly in recent years, the BBC has learned.

Sulphur hexafluoride, or SF6, is widely used in the electrical industry to prevent short circuits and accidents.

But leaks of the little-known gas in the UK and the rest of the EU in 2017 were the equivalent of putting an extra 1.3 million cars on the road."

See the artice for details but here is a further quote:

Quote
Are there alternatives - and are they very expensive?
The question of alternatives to SF6 has been contentious over recent years.

For high-voltage applications, experts say there are very few solutions that have been rigorously tested.

"There is no real alternative that is proven," said Prof Manu Haddad from the school of engineering at Cardiff University.

"There are some that are being proposed now but to prove their operation over a long period of time is a risk that many companies don't want to take."

However, for medium voltage operations there are several tried-and-tested materials. Some in the industry say that the conservative nature of the electrical industry is the key reason that few want to change to a less harmful alternative.

"I will tell you, everyone in this industry knows you can do this; there is not a technical reason not to do it," said Louis Shaffer from Eaton.

"It's not really economic; it's more a question that change takes effort and if you don't have to, you won't do it."
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #3 on: November 07, 2019, 09:19:21 PM »
The averages for July 2019 have been published:
July 2019:     9.97 ppt
July 2018:     9.61 ppt
Last updated: November 05, 2019
The annual increase of 0.36 ppt is a tiny bit higher than in May.
The relative increase of 3.7% is remarkable. If you put that relation onto CO2 concentrations, the annual increase would be around 15 ppm (calculation based on 410 ppm). But in contrast to CO2 SF6 has no natural sinks.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #4 on: December 08, 2019, 08:42:09 PM »
Finally, SF6 also received an update.

August 2019:     9.98 ppt
August 2018:     9.63 ppt
Last updated: December 05, 2019

The annual increase of 0.35 ppt is comparable to the values we saw the last months.
Interestingly, the relative increase (0.35 ppt = 3,6 %) is much higher than that of the other greenhouse gases. It is probably the lack of natural sinks that causes this effect.
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Tom_Mazanec

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Re: Trends in Atmospheric SF6
« Reply #5 on: December 16, 2019, 12:55:35 AM »
Quote
It is probably the lack of natural sinks that causes this effect.
Could it also be that the baseline is so small, just a few ppt?
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #6 on: December 19, 2019, 09:50:33 PM »
I think that SF6 would be completely absent without humans on this planet. It is no naturally formed molecule, but a product of chemical industry.
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Re: Trends in Atmospheric SF6
« Reply #7 on: December 20, 2019, 08:18:49 AM »
I found this interesting:

https://en.wikipedia.org/wiki/Sulfur_hexafluoride#Greenhouse_gas

According to the Intergovernmental Panel on Climate Change, SF6 is the most potent greenhouse gas that it has evaluated, with a global warming potential of 23,900[28] times that of CO2 when compared over a 100-year period. Sulfur hexafluoride is inert in the troposphere and stratosphere and is extremely long-lived, with an estimated atmospheric lifetime of 800–3,200 years.[29]

Measurements of SF6 show that its global average mixing ratio has increased by about 0.2 ppt (parts per trillion) per year to over 9 ppt as of February 2018.[30][31] Average global SF6 concentrations increased by about seven percent per year during the 1980s and 1990s, mostly as the result of its use in the magnesium production industry, and by electrical utilities and electronics manufacturers. Given the small amounts of SF6 released compared to carbon dioxide, its overall contribution to global warming is estimated to be less than 0.2 percent.
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Re: Trends in Atmospheric SF6
« Reply #8 on: December 20, 2019, 08:42:33 PM »
SF6 is included in the "15 minor" trace gases shown in red in the graph below.  All greenhouse gases are tracked by NOAA at this website:

https://www.esrl.noaa.gov/gmd/aggi/aggi.html

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Stephan

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Re: Trends in Atmospheric SF6
« Reply #9 on: January 10, 2020, 04:59:24 PM »
The monthly average for September 2019 is available:

September 2019:     10.00 ppt
September 2018:     9.66 ppt
Last updated: January 05, 2020

The annual increase of 0.34 ppt is comparable to the values we saw the last months.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #10 on: January 23, 2020, 10:36:05 PM »
Quote from: Stephan on January 10, 2020, 04:59:24 PM
The monthly average for September 2019 is available:

September 2019:     10.00 ppt
September 2018:     9.66 ppt
Last updated: January 05, 2020

The annual increase of 0.34 ppt is comparable to the values we saw the last months.
However, SF6 ppt has increased by 150% since 1997.

Using the 20 year GWP** of 16,300 gives a CO2e of just on 0.16 ppm, i.e. marginal but becoming of significance.
________________________________________________________
** I used the 20 year GWP as I will certainly be dead befor 50 years (and may well not make 20)
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #11 on: February 08, 2020, 10:37:17 PM »
NOAA's October values for SF6 are available:

October 2019:     10.03 ppt
October 2018:     9.71 ppt
Last updated: February 05, 2020

After September broke the limit of 10.00 ppt, here comes a further increase.
The annual increase of 0.32 ppt is at the lower end of the range (since about 2012 the annual increase lies between 0.30 and 0.37 ppt, peaking in 2017).

The NOAA history of atmospheric SF6 goes back to July 1997. If I set an index in Jan 2000 at 100, then October 2019 has a relative value of 223. This is more than a doubling since then!!
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #12 on: March 06, 2020, 08:27:45 PM »
NOAA has updated its report on atmospheric SF6:

November 2019:     10.07 ppt
November 2018:       9.75 ppt
Last updated: March 05, 2020

This value represents a CO2 eq. of about 0.58 / 0.78 ppm. (20 y / 100 y)

The annual increase of 0.32 ppt is at the lower end of the range (since about 2012 the annual increase lies between 0.30 and 0.37 ppt, peaking in 2017).

The NOAA history of atmospheric SF6 goes back to July 1997. If I set an index in Jan 2000 at 100, then November 2019 has a relative value of 224.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #13 on: April 06, 2020, 08:47:00 PM »
NOAA has updated its report on atmospheric SF6:

December 2019:     10.09 ppt
December 2018:       9.78 ppt
Last updated: April 05, 2020

The 2019 average is thus 9.94 ppt, 0.34 ppt above the 2018 average.

This value represents a CO2 eq. of about 0.59 / 0.78 ppm. (20 y / 100 y)

The annual increase of 0.31 ppt is at the lower end of the range (since about 2012 the annual increase lies between 0.30 and 0.37 ppt, peaking in 2017).

The NOAA history of atmospheric SF6 goes back to July 1997. If I set an index in Jan 2000 at 100, then December 2019 has a relative value of 224.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #14 on: May 05, 2020, 10:31:20 PM »
It is the fifth of the new month and so the average values of the "NOAA gases" are available.
Here is the value of SF6:

January 2020:     10.12 ppt
January 2019:     9.80 ppt
Last updated: May 05, 2020

This value represents a CO2 eq. of about 0.59 / 0.79 ppm. (20 y / 100 y)

The annual increase of 0.32 ppt is at the lower end of the range (since about 2012 the annual increase lies between 0.30 and 0.37 ppt, peaking in 2017).

The NOAA history of atmospheric SF6 goes back to July 1997. If I set an index in Jan 2000 at 100, then January 2020 has a relative value of 225.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #15 on: June 05, 2020, 09:37:55 PM »
It is the fifth of the new month and so the average values of the "NOAA gases" are available.
Here is the value of SF6:

February 2020:     10.15 ppt
February 2019:     9.82 ppt
Last updated: June 05, 2020

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. February 2020 has the relative value compared to that index of 1,197 (= almost 12-fold; imagine that would be the increase rate of CO2!)
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #16 on: July 06, 2020, 09:05:00 PM »
It is the sixth of the new month and so the average values of the "NOAA gases" are available.
Here is the value of SF6:

March 2020:     10.18 ppt
March 2019:       9.85 ppt
Last updated: July 05, 2020

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. March 2020 has now passed the relative value compared to that index of 1,200 (= 12-fold; imagine that would be the increase rate of CO2!)
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #17 on: August 06, 2020, 07:24:23 PM »
It is the sixth of the new month and so the average values of the "NOAA gases" are available.
Here is the value of SF6:

April 2020:     10.20 ppt
April 2019:       9.88 ppt
Last updated: August 05, 2020

The annual increase is 0.32 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. April 2020 is at 1,202.

Attached a graph of the SF6 development. I added a linear trend line - not because I think the growth is linear, but more to show its exponential nature.
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oren

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Re: Trends in Atmospheric SF6
« Reply #18 on: August 07, 2020, 05:53:56 PM »
Thank you Stephan for the regular updates and for the chart, which helps visualize the situation.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #19 on: September 10, 2020, 08:35:39 PM »
With a little delay also the latest monthly average for SF6 is available from NOAA:

May 2020:     10.23 ppt
May 2019:       9.90 ppt
Last updated: September 05, 2020

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. May 2020 is at 1,206.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #20 on: October 06, 2020, 08:33:38 PM »
The latest monthly average for SF6 is available from NOAA:

June 2020:     10.26 ppt
June 2019:       9.92 ppt
Last updated: October 05, 2020

The annual increase is 0.34 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. June 2020 is at 1,210.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #21 on: November 06, 2020, 07:13:54 PM »
The latest monthly average for SF6 is available from NOAA:

July 2020:     10.29 ppt
July 2019:       9.96 ppt
Last updated: November 05, 2020

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. July 2020 is at 1,213.

See attached graph. Click to enlarge. Please note that before 1999 I had to use a separate data source which has a slightly different slope
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #22 on: December 08, 2020, 09:41:21 PM »
The latest monthly average for SF6 is available from NOAA:

August 2020:     10.30 ppt
August 2019:       9.98 ppt
Last updated: December 05, 2020

The annual increase is 0.32 ppt. It is about average of what has been observed in the last decade.

I set an index of 100 for the year 1980 [0.848 ppt]. August 2020 is at 1,214.
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Tom_Mazanec

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Re: Trends in Atmospheric SF6
« Reply #23 on: December 08, 2020, 10:48:31 PM »
I think that is only a few thousand tons of SF6 in the whole atmosphere, right?
And yet it is significant.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #24 on: January 12, 2021, 10:19:17 PM »
Almost a week later than usual here are the latest Data from NOAA concerning SF6:

September 2020:     10.33 ppt
September 2019:     10.00 ppt
Last updated: January 05, 2021

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade (0.325 ppt/a).

I set an index of 100 for the year 1980 [0.848 ppt]. September 2020 is at 1,218.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #25 on: February 05, 2021, 08:48:03 PM »
It is the fifth of the month, which means NOAA has updated their monthly averages.

October 2020:     10.36 ppt
October 2019:     10.03 ppt
October 2010:       7.10 ppt
Last updated: February 05, 2021

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade (0.326 ppt/a).

I set an index of 100 for the year 1980 [0.848 ppt]. October 2020 is at 1,221.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #26 on: March 05, 2021, 08:06:17 PM »
The latest monthly average of SF6 concentration has been published by NOAA.

November 2020:     10.39 ppt
November 2019:     10.06 ppt
November 2010:       7.13 ppt
Last updated: March 05, 2021

The annual increase is 0.33 ppt. It is about average of what has been observed in the last decade (0.326 ppt/a).

I set an index of 100 for the year 1980 [0.848 ppt]. November 2020 is at 1,225.
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #27 on: May 05, 2021, 08:39:21 PM »
It is the fifth of the month. Therefore a new monthly average of SF6 has been published by NOAA:

January 2021:     10.47 ppt
January 2020:     10.12 ppt
January 2011:       7.18 ppt
Last updated: May 05, 2021

The annual increase is 0.35 ppt. It is a little above the average of what has been observed in the last decade (0.329 ppt/a).
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. January 2021 is at 1,234.

PS: No December 2020 average has been published on April 5. I have extrapolated a monthly average of 10.43 ppt and I will correct it as soon as possible.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #28 on: May 05, 2021, 09:14:06 PM »
Quote from: Stephan on May 05, 2021, 08:39:21 PM
It is the fifth of the month. Therefore a new monthly average of SF6 has been published by NOAA:

January 2021:     10.47 ppt
January 2020:     10.12 ppt
January 2011:       7.18 ppt
Last updated: May 05, 2021

The annual increase is 0.35 ppt. It is a little above the average of what has been observed in the last decade (0.329 ppt/a).
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. January 2021 is at 1,234.

PS: No December 2020 average has been published on April 5. I have extrapolated a monthly average of 10.43 ppt and I will correct it as soon as possible.
You got it right again, Stephan
2020      12      2020.958         10.43

graph attached

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Re: Trends in Atmospheric SF6
« Reply #29 on: June 08, 2021, 07:26:51 PM »
A new monthly average of SF6 has been published by NOAA:

February 2021:     10.49 ppt
February 2020:     10.15 ppt
February 2011:       7.20 ppt
Last updated: June 07, 2021

The annual increase is 0.34 ppt. It is a little above the average of what has been observed in the last decade (0.329 ppt/a).
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. February 2021 is at 1,237.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #30 on: June 09, 2021, 12:32:26 AM »
and a graph
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Re: Trends in Atmospheric SF6
« Reply #31 on: July 07, 2021, 08:21:04 AM »
A new monthly average of global SF6 has been published.

March 2021:     10.52 ppt
March 2020:     10.18 ppt
March 2011:       7.23 ppt
Last updated: July 05, 2021

The annual increase is 0.34 ppt. It is a little above the average of what has been observed in the last decade (0.329 ppt/a).
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. March 2021 is at 1,240.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #32 on: July 07, 2021, 05:50:02 PM »
And a graph...
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Re: Trends in Atmospheric SF6
« Reply #33 on: August 05, 2021, 06:54:10 PM »
A new monthly average of global SF6 has been published.

April 2021:     10.56 ppt
April 2020:     10.20 ppt
April 2011:       7.26 ppt
Last updated: August 05, 2021

The annual increase is 0.36 ppt. It is above the average of what has been observed in the last decade (0.33 ppt/a). Only August and September 2017 had higher increase rates!
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. April 2021 is at 1,245.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #34 on: August 06, 2021, 03:25:13 PM »
And I attach a graph
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Stephan

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Re: Trends in Atmospheric SF6
« Reply #35 on: August 06, 2021, 04:14:13 PM »
Hi gero,
thanks for the attached graphs in the four "NOAA gases" threads.
Stephan
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Re: Trends in Atmospheric SF6
« Reply #36 on: September 07, 2021, 09:48:34 PM »
Please find the latest monthly average of global SF6:

May 2021:     10.59 ppt
May 2020:     10.23 ppt
May 2011:       7.28 ppt
Last updated: September 07, 2021

The annual increase is 0.36 ppt. It is above the average of what has been observed in the last decade (0.33 ppt/a). Only August and September 2017 had higher increase rates!
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. May 2021 is at 1,248.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #37 on: September 07, 2021, 10:21:13 PM »
and here is the graph

Probably the first time I have posted a quadratic trend R2 coefficient of 1.000.

click to enlarge
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Re: Trends in Atmospheric SF6
« Reply #38 on: September 07, 2021, 10:27:57 PM »
This "perfect" trend line might not be too unlikely as there are no natural sources and no natural sinks for SF6. The production and use of this molecule might even be more or less independent from economical cycles.
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kassy

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Re: Trends in Atmospheric SF6
« Reply #39 on: September 08, 2021, 06:13:23 PM »
One of it´s main uses is in high power electrical transmission so we are bound to use more. We should just replace it where we can and manage it well were we use it (see my post above).
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Re: Trends in Atmospheric SF6
« Reply #40 on: October 06, 2021, 03:42:05 PM »
The latest monthly average of global SF6 has been published by NOAA:

June 2021:     10.62 ppt
June 2020:     10.26 ppt
June 2011:       7.30 ppt
Last updated: October 05, 2021

The annual increase is 0.36 ppt. It is above the average of what has been observed in the last decade (0.33 ppt/a). Only August and September 2017 had higher increase rates!
No question, it is the highest SF6 concentration in human's, probably in earth's history.

I set an index of 100 for the year 1980 [0.848 ppt]. June 2021 is at 1,252.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #41 on: October 06, 2021, 04:56:12 PM »
Graph attached

click image to enlarge
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Re: Trends in Atmospheric SF6
« Reply #42 on: November 05, 2021, 10:29:40 PM »
On the fifth of a new month NOAA has published the latest monthly average of four selected greenhouse gases. Here is the value for SF6:

July 2021:     10.64 ppt
July 2020:     10.28 ppt
July 2011:       7.30 ppt
Last updated: November 05, 2021

The annual increase is 0.36 ppt. It is above the average of what has been observed in the last decade (0.33 ppt/a). Only August and September 2017 had higher increase rates!
No question, it is the highest SF6 concentration in human's, probably in earth's history, and its value rises continuously.

I set an index of 100 for the year 1980 [0.848 ppt]. July 2021 is at 1,254.
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Re: Trends in Atmospheric SF6
« Reply #43 on: November 06, 2021, 06:00:48 PM »
& here is the graph

click image to enlarge
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Re: Trends in Atmospheric SF6
« Reply #44 on: December 06, 2021, 10:06:58 PM »
On the fifth of a new month NOAA has published the latest monthly average of four selected greenhouse gases. Here is the value for SF6:

August 2021:     10.66 ppt
August 2020:     10.30 ppt
August 2011:       7.31 ppt
Last updated: December 05, 2021

The annual increase is 0.36 ppt. It is above the average of what has been observed in the last decade (0.335 ppt/a). Only August and September 2017 had higher increase rates!
No question, it is the highest SF6 concentration in human's, probably in earth's history, and its value rises continuously.

I set an index of 100 for the year 1980 [0.848 ppt]. August 2021 is at 1,257.
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gerontocrat

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Re: Trends in Atmospheric SF6
« Reply #45 on: January 06, 2022, 03:24:10 PM »
https://gml.noaa.gov/ccgg/trends_sf6/

September 21 graph attached. The only way is up.

click image to enlarge
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Re: Trends in Atmospheric SF6
« Reply #46 on: January 06, 2022, 07:10:43 PM »
Thanks for the graph, gero. The R² is still at 1.000  ;)

Please find the latest monthly average of global SF6:

September 2021:     10.69 ppt
September 2020:     10.33 ppt
September 2011:       7.33 ppt
Last updated: January 05, 2022

The annual increase is 0.36 ppt. It is above the average of what has been observed in the last decade (0.335 ppt/a). Only August and September 2017 had higher increase rates!
No question, it is the highest SF6 concentration in human's, probably in earth's history, and its value rises continuously.

I set an index of 100 for the year 1980 [0.848 ppt]. September 2021 is at 1,260.
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Re: Trends in Atmospheric SF6
« Reply #47 on: January 07, 2022, 06:01:55 PM »
To the bold yes it is:

Quote
According to the Intergovernmental Panel on Climate Change, SF6 is the most potent greenhouse gas that has been evaluated, with a global warming potential of 23,900 times that of CO2 when compared over a 100-year period.[40] Sulfur hexafluoride is inert in the troposphere and stratosphere and is extremely long-lived, with an estimated atmospheric lifetime of 800–3,200 years.[41]

Measurements of SF6 show that its global average mixing ratio has increased from a steady base of about 54 parts per quadrillion[12] prior to industrialization, to over 10 parts per trillion (ppt) as of April 2020

https://en.wikipedia.org/wiki/Sulfur_hexafluoride

Very hard to get rid of too. This should be way more regulated then it is. Don´t use it when there are alternatives or when it is not needed.
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Re: Trends in Atmospheric SF6
« Reply #48 on: February 08, 2022, 10:24:17 PM »
With a short delay here are the latest averages for atmospheric SF6:

October 2021:     10.74 ppt
October 2020:     10.36 ppt
October 2011:       7.37 ppt
Last updated: February 05, 2022

The annual increase is 0.38 ppt. It is higher than what has been observed in the last decade (0.337 ppt/a). It ties with September 2017 being the highest increase rate ever!
No question, it is the highest SF6 concentration in human's, probably in earth's history, and its value rises continuously.

I set an index of 100 for the year 1980 [0.848 ppt]. October 2021 is at 1,266.
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Re: Trends in Atmospheric SF6
« Reply #49 on: February 09, 2022, 02:18:12 PM »
And here is the graph
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