Desperate Deniers head for the clouds at WUWT

My last article was a report of the latest surface temperature, from NASA. This one is about the lower troposphere changes - and denier dross from WUWT.

I've not spent much time at WUWT in recent months (or here at HotWhopper). The articles there have changed a bit since Anthony Watts took time off. There are a lot more political articles and fewer science articles. Charles the Moderator is in charge but doesn't have a lot of people to write - it's mainly childish Eric Worrall and a petrol-head called David Middleton. Most of the regular WUWT contributors from days gone by have disappeared (justthefacts, Bob Tisdale, Tim Ball etc., and Anthony Watts himself.)

These days, when Charles copies and pastes a press release about a scientific publication, he doesn't have to add the dog-whistling word "claim" at the front of the headline. WUWT readers are now very well trained and understand that if there's a scientific press release it means they are expected to add comments along the lines of "climate science is a hoax" (repeated 100 times or they are put in detention).

Global warming is in the air, in the UAH lower troposphere

The UAH data for October is out. John Christy and Roy Spencer from the University of Arizona Huntsville have a contract with NOAA to analyse temperature changes in the atmosphere. Each month they publish the latest data.

Deniers dislike it less than other data sets, especially since John and Roy revised the latest version considerably downwards, making their data an anomaly!

I came across a chart I prepared a few years ago and thought I'd do it over again using the latest UAH data.

Not as hot June troposphere temperatures, with a new version from RSS

The troposphere temperatures for June 2017 are out. This report covers the lower troposphere as recorded in UAH v6 and the new RSS TLT v4, and RSS TTT v4 for the troposphere (without the "lower"). It follows pretty much the same format as previous monthly updates.

The troposphere is the part of the atmosphere directly above the surface. The temperatures are estimated from measurements recorded by satellites orbiting the earth.  They are not direct temperature measurements (the satellites don't record thermometer readings). And they are of an average of a depth of the atmosphere - up to several kilometres above the surface. The different versions of reported satellite temperature data tend to vary more than different versions of surface temperature.

For all three different temperature data sets shown, the 12 months to June 2017 is the second hottest 12 months in the record (comparing similar July-June periods).

• For RSS TTT (troposphere), June itself was the just the eighth hottest June, with June 1998 the hottest.
• For RSS TLT (lower troposphere), June was the equal fifth hottest June (with June 2014). June 2016 was the hottest.
• The lower troposphere (UAH v6) June was the eighth hottest June on record. June 1998 was the hottest.

Trending troposphere temperatures to May 2017

The troposphere temperatures for May 2017 are out. This report covers the lower troposphere as recorded in UAH v6 and RSS TTT for the troposphere (without the "lower"). It follows pretty much the same format as previous monthly updates.

For RSS TTT (troposphere), the 12 months to May 2017 is the second the hottest 12 months in the record (comparing similar June-May periods). Now that last year's intense El Nino has dissipated, May itself was the just the fourth hottest May, with May 2016 the hottest.

The lower troposphere (UAH v6) also showed the 12 months to May as the second hottest on record. However, in the UAH record, May was the third hottest May on record, after May 1998 and May 2016.

Second hottest April on record

According to GISS NASA, the average global surface temperature anomaly for April was 0.88 °C, which is 0.18 °C lower than the hottest April in 2016, making April 2017 the second hottest April in the record.

Here is a chart of the average of 12 months to April each year. The 12 months to April 2017 averaged 0.91 °C above the 1951-1980 mean, which was 0.07 °C cooler than the 12 months to April 2016,. This makes it the second hottest April to April 12 month period on record.

Figure 1 | Global mean surface temperature anomaly for the 12 months to April each year. The base period is 1951-1980. Data source: GISS NASA

Second hottest March on record - NASA global temperature update with year to date comparison

According to GISS NASA, the average global surface temperature anomaly for March was 1.12 °C, which is 0.16 °C lower than the hottest March in 2016, making March 2017 the second hottest March in the record.

Here is a chart of the average of 12 months to March each year. The 12 months to March 2017 averaged 0.93 °C above the 1951-1980 mean and was almost identical to the 12 months to March 2016, being just 0.02 °C cooler. This makes it the second hottest April to March 12 month period on record.

Figure 1 | Global mean surface temperature anomaly for the 12 months to March each year. The base period is 1951-1980. Data source: GISS NASA

Second hottest February on record - is another El Niño on the way already?

According to GISS NASA, the average global surface temperature anomaly for February was 1.10 °C, which is 0.22 °C lower than the hottest February in 2016 and the second hottest February in the record.

Here is a chart of the average of 12 months to February each year. The 12 months to February 2017 averaged 0.94 °C above the 1951-1980 mean and was almost identical to the 12 months to February 2016, being just 0.01 °C hotter. This makes it the hottest March to February 12 month period on record.

Figure 1 | Global mean surface temperature anomaly for the 12 months to February each year. The base period is 1951-1980. Data source: GISS NASA

Not the hottest January in the troposphere, but way hotter than normal in the Arctic

The troposphere temperatures for January 2017 were released earlier this month. The lower troposphere is recorded in UAH v6 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower") and follows pretty much the same format as previous monthly updates.

For RSS TTT (troposphere), the 12 months to January 2017 remain the hottest 12 months in the record (comparing similar Feb-Jan periods). January itself was the just the fifth hottest January, with January 2016 the hottest.

The lower troposphere (UAH v6) also showed the 12 months to January as the hottest on record. However, January was only the seventh hottest January on record, with January 2016 the hottest.

2016 was the hottest year on record for the troposphere

For the troposphere, 2016 was the hottest year on record!

The troposphere temperatures for December 2016 have been released. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower") and follows pretty much the same format as previous monthly updates.

For RSS TTT (troposphere), 2016 was the hottest year in the record. Last month was the second hottest December on record.

The lower troposphere (UAH beta v6.05) also showed 2016 as the hottest year in the record. However, December was only the sixth hottest December on record, with 2015 the hottest.

Insignificant record warming and other climate remarkables from deniersville

Despite climate science deniers thinking global warming will stop on 20 January, there is little changed in climate conspiracy land. It's just more of the same old denier memes that have been circulating for years. At WUWT they've had John Christy going on about CO2 being plant food, and some very detailed work to try to prove something or the other about the medieval climate anomaly (see the interactive map and references here).

Deniers still enraptured with medieval warming

Regarding the latter, I'm not sure that deniers know that it was climate scientists who did the hard work to determine the extent and timing of warmer and cooler periods in recent history. (In climate terms, the Holocene is recent history.)  Many of them have some odd notion that climate scientists, who've been the ones finding out about the past, have also been trying to "cover up" what they've found.

Deniers are a odd bunch.

Hottest November on record for the troposphere - with a comment on Trumped Up Courage

Despite what David Rose, the Global Warming Policy Foundation, the fake press (Breitbart), WUWT, and the US House Science Committee will try to claim - global warming is real and happening now. There is no ice age about to arrive.

For the troposphere, November was the hottest November on record!

The troposphere temperatures for November 2016 have been released. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower") and follows pretty much the same format as previous monthly updates.

For RSS TTT (troposphere), last month was the hottest November on record. For 2016 to be colder than the previous hottest year (1998), the troposphere would have to average a negative anomaly:- less than -1.57 °C for the remaining month. It's an understatement to say that is unlikely.

The lower troposphere (UAH beta v6.05) was also the hottest November on record with 2015. For 1998 to remain the hottest year in the UAH lower troposphere record, the anomaly for December would need to be below minus 0.21 °C. That's not likely but not impossible.

Troposphere temperatures for October 2016 - another hottest on record

The troposphere temperatures for October 2016 have been released. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower") and follows pretty much the same format as previous monthly updates.

For RSS TTT (troposphere), last month was the hottest October on record. For 2016 to be colder than the previous hottest year (1998), the troposphere would have to average a negative anomaly:- less than -0.41 °C for the remaining months.

The lower troposphere (UAH beta v6.05) was the equal hottest October on record with 2015. For 1998 to remain the hottest year in the UAH lower troposphere record, the average for the next two months would need to be below 0.21 °C.

Anthony Watts makes a huge fuss about miniscule changes in atmospheric temperature data

A few days ago an astute reader wrote to me, asking if I knew why the RSS historical temperatures for the lower atmosphere varied month to month. I in turn asked Dr Carl Mears, who is the scientist behind the RSS temperature analysis (among other things).

To see what changes month to month, compare the charts for RSS TLT v3.3, which is just of the lower troposphere. The data is from that provided in November 2013, March 2016, July 2016 and October 2016:

Figure 1 | Lower troposphere temperature RSS v3.3. The chart shows data as reported in November 2013, March 2016, July 2016 and October 2016. Source: RSS

Do you see the big changes? No? So what is all the fuss about at WUWT (archived here) you might wonder.

Another "hottest month": Troposphere temperatures for September 2016

The troposphere temperatures for September 2016 have been released. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower") and follows pretty much the same format as previous monthly updates.

In all records, the September global anomaly was higher than it was in August but lower than earlier this year as El Niño is now over.

For RSS TTT (troposphere), last month was the hottest September on record. For 2016 to be colder than the previous hottest year (1998), the troposphere would have to average a negative anomaly:- less than -.025 °C for the remaining months.

The lower troposphere (UAH beta v6.05) was the equal hottest September on record with 1998. For 1998 to remain the hottest year in the UAH lower troposphere record, the average for the next three months would need to be below 0.28 °C, which could happen. (Roy and John changed the August 2016 temperature, dropping it from 0.44 °C to 0.43 °C.)

Troposphere temperatures for August 2016

The troposphere temperatures for August 2016 have been released. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower") and follows pretty much the same format as previous monthly updates.

In all records, the August global anomaly was higher than it was in July but lower than earlier this year as El Niño is now over.

For RSS TTT (troposphere), last month was the hottest August on record. For 2016 to be colder than the previous hottest year (1998), the troposphere would have to average less than 0.19 °C for the remaining months.

In the lower troposphere (UAH beta v6.05) last month is the second hottest August on record, lower than it was in 1998. For 1998 to remain the hottest year in the UAH lower troposphere record, the average for the next four months would need to be below 0.32 °C.

Troposphere temperatures for July 2016

The troposphere temperatures are out for July 2016. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower"). This report follows pretty much the same format as previous monthly updates. It's my fault that it's a bit later than usual. (I was away most of last week.)

In all records, the July global anomaly was a bit higher than it was in June but lower than earlier this year as El Niño is now over. In the lower troposphere (UAH beta v6.05) last month is the second hottest July on record, lower than it was in 1998. For RSS TTT (troposphere), last month was the hottest July on record.

Troposphere temperature (RSS TTT v4) chart

First here is RSS TTT with the latest dataset, version 4. TTT seems to be measure more of the troposphere than TLT (that is, it has a greater vertical profile) with less of the stratosphere than the mid-troposphere data (TMT). It shows a higher rate of warming than RSS v3.3 and higher than UAH. Hover the cursor (arrow) over the plots to see the data points, trend etc.

The chart below is the average of the 12 months to July, from August 1979 to July 1980, through to August 2015 to July 2016.

Figure 1 | Troposphere temperature for 12 months to July (TTT). Anomaly is from the 1979-1998 mean. Data source: RSS

Troposphere temperatures for June 2016

The troposphere temperatures are out for June 2016. The lower troposphere is recorded in UAH v6 beta 5 and RSS TLT v3.3. This report also covers RSS TTT for the troposphere (without the "lower").

In all records, the June global anomaly dropped again, as El Nino dissipated. In the lower troposphere (UAH beta v6.05) and the troposphere (RSS TTT) the June anomaly is lower than it was in 1998. The drop was greater than most people expected, particularly for UAH TLT. Anthony Watts called it "spectacular". However it was still the second hottest June in the UAH record and the third hottest in RSS TTT.

Troposphere temperature (RSS TTT v4) chart

First here is RSS TTT with the latest dataset, version 4. TTT seems to be measure more of the troposphere than TLT (that is, it has a greater vertical profile) with less of the stratosphere than the mid-troposphere data (TMT). It shows a higher rate of warming than RSS v3.3 and higher than UAH.

Hover the cursor (arrow) over the plots to see the data points, trend etc.

The chart below is the average of the 12 months to June, from July 1979 to June 1980, through to July 2015 to June 2016.

Figure 1 | Troposphere temperature for 12 months to June (TTT). Anomaly is from the 1979-1998 mean. Data source: RSS

Troposphere temperatures for May 2016

The troposphere temperatures are out for May 2016. The lower troposphere as UAH v6 beta 5 and RSS TLT v3.3. As last month, this report also covers RSS TTT for the troposphere.

In all records, the May global anomaly dropped again, as El Nino dissipated. In the lower troposphere (UAH beta v6.05) and the troposphere (RSS TTT) the May anomaly is lower than it was in 1998.

Troposphere temperature (RSS TTT v4) chart

First here is RSS TTT with the latest dataset, version 4. TTT seems to be measure more of the troposphere than TLT (that is, it has a greater vertical profile) with less of the stratosphere than the mid-troposphere data (TMT). It shows a higher rate of warming than RSS v3.3 and higher than UAH.

Hover the cursor (arrow) over the plots to see the data points, trend etc.

The chart below is the average of the 12 months to May, from June 1979 to May 1980, through to June 2015 to May 2016.

Figure 1 | Troposphere temperature for 12 months to May (TTT). Anomaly is from the 1979-1998 mean. Data source: RSS

Troposphere temperatures for April and muttered excuses from deniers at WUWT

The troposphere temperatures are out for April 2016. The lower troposphere as UAH v6 beta 5 and RSS TLT v3.3. As last month, this report also covers RSS TTT for the troposphere.

In all records, the April global anomaly is lower than it was for February and March. In the lower troposphere (UAH and RSS TLT only) the April data is lower than it was in 1998. In RSS TTT, April is the hottest April in the record.

Troposphere temperature (RSS TTT v4) chart

Last month I posted the TTT data from RSS which is now at version 4. TTT seems to be more of the troposphere than TLT (that is, it has a greater vertical profile) with less of the stratosphere than the mid-troposphere data (TMT). Hover the cursor (arrow) over the plots to see the data points, trend etc.

The chart below is the average of the 12 months to April, from May 1979 to April 1980, through to May 2015 to April 2016. Some caution is warranted because months to the end of 2016 are likely to be cooler on average than the first months of this year (2016).

Figure 1 | Troposphere temperature for 12 months to April (TTT). Anomaly is from the 1979-1998 mean. Data source: RSS

Lower troposphere temperatures March 2016

The lower troposphere temperatures are out for March 2016, as UAH v6 beta 5 and RSS v3.3. In both cases the global anomaly is lower than it was for February, but the hottest March in the record. Below are charts for the month of March only for each year going back to 1979. First is RSS lower troposphere. The anomaly was 0.842 °C above the 1979-1998 mean, which was 0.26 °C higher than the previously hottest March in 2010 and 1998 (equal at 0.585 °C):

Figure 1 | Lower troposphere temperature for March only. Data source: RSS