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Author Topic: NOAA ESRL Global CH4 Trends  (Read 1339 times)

Apocalypse4Real

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NOAA ESRL Global CH4 Trends
« on: February 25, 2018, 09:50:17 PM »
NOAA ESRL global methane (CH4) concentration hit a new high of 1860.1 ppb in November, 2017.

This puts us on a trend of about a 9 ppb increase annually. The five year change was about 44 ppb, and the decadal change is about 70 ppb. There is more on the Apocalypse4Real blog.

Apocalypse4Real

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Re: NOAA ESRL Global CH4 Trends
« Reply #1 on: July 03, 2018, 11:28:14 PM »
March 2018 NOAA ESRL Global CH4 hit 1859.1 ppb up 11.2 ppb over 2017, up 46.1 ppb over 2013 and 73.6 ppb above 2008. See: https://www.megiddo666.apocalypse4real-globalmethanetracking.com/2018/07/march-2018-global-mean-ch4-up-112-ppb.html

ReverendMilkbone

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Re: NOAA ESRL Global CH4 Trends
« Reply #2 on: July 04, 2018, 08:43:21 PM »
Apocalypse4real can you break that graph down "barney style" for me?  I don't understand it.

SteveMDFP

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Re: NOAA ESRL Global CH4 Trends
« Reply #3 on: July 05, 2018, 12:34:36 AM »
Apocalypse4real can you break that graph down "barney style" for me?  I don't understand it.

A4R's image seems to show *rate of change* of methane levels, with three different moving average periods, and smoothing curves. It's confusing to me, too.  But these differing curves are all apparently calculated from monthly average measurements shown in a single, more easily understood graph of absolute methane levels, attached.

Apocalypse4Real

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Re: NOAA ESRL Global CH4 Trends
« Reply #4 on: July 11, 2018, 10:23:14 PM »
NOAA ESRL April 2018 global mean methane concentration was 1858 ppb. This is an increase of 10.2 ppb over April 2017. It has increased 45.2 ppb over five years, since April 2013. It is up 71.5 ppb since April 2008.

The chart with the single red line is the monthly mean methane of the entire NOAA ESRL record since 1983.

The second chart shows three trends. The blue line is the monthly change from the prior year concentration for that month. The red line shows the change in concentration from the same month five years before. The green line shows the change in concentration from the same month ten years before. The ploynomial trends are added to provide an idea of how far above or below the trend the three means are moving.