20 June 2016

How to load .nc files into Matlab

Much climate data comes in the form of NetCDF files which have an .nc suffix.

This post is as much for my own reference in case I forget how to do it, as it is for anyone else interested in opening a NetCDF file in Matlab.

Here's a list of the current climate NetCDF files I am interested in:

  • ·       Satellite Temperature Lower Troposphere

(Note that the name suffix changes slightly with each month)

  •     NCEP Reanalysis 2 of Upward longwave radiation flux at nominal top of atmosphere

29 May 2016

Why the "missing heat" of AGW can't be going in the ocean

The reason "missing heat" can't be going in the ocean is that the ocean is warming. A warmer ocean makes it less likely that heat will be drawn in from the atmosphere, not more.

Here is the global sea surface temperature anomaly, and it's on the rise:

(Source. Many more graphs here. Also here.)

14 May 2016

Circular axis unfairly weights more recent years

In the latest deception by Team Consensus, Ed Hawkins converts temperatures that are normally displayed on an X-Y plane to a circular axis.

This has the effect of increasing the area occupied by recent years and cramming past years into a little dot in the middle. The resulting spiral, made scarier by employing a violet to red rainbow colour, gives the impression of an out of control temperature rise.

27 March 2016

Recent uptick in AGW concern epitomises ignorance of fears

The recent uptick in polls of the public's concern of AGW epitomise the public's ignorance regarding AGW (and frankly most issues scientific or technical).

16 February 2016

AGW water-vapour-feedback theory disproved by satellite observations

AGW theory says that CO2 can cause some warming, for example 1C for a doubling of CO2; but that the resulting water vapour feedback will cause an extra 2C or so of warming, which is where the real AGW danger comes from. (Scared yet?)

Climate models [1, 2, 3] and observations show that each 1C of warming causes about a 7% increase in water vapour, which in turn causes a further 2C of warming.

Well, water vapour did just increase by about 7% over course of the year of 2015, but little happened to earth's average temperature; maybe a 0.2C warming at most over the same period:

23 January 2016

2015 is 3rd hottest on satellite record since 1979, not 1st

I put RSS data into calendar year bins & graphed it (Excel file). 2015 is 3rd hottest calendar year since 1979 according to satellite, not 1st hottest ("evah") as some claim.

15 December 2015

Deforestation has same 'fingerprint' as fossil fuel combustion

Several climate metrics are claimed to be fingerprints showing that human fossil fuel combustion caused the recent atmospheric carbon dioxide rise [1, 2]. These are:

1) Rising CO2 and falling oxygen
2) Falling 13C/12C ratio
3) CO2 is highest in ~800,000 years

04 December 2015

Decline in 13C/12C ratio not keeping pace with fossil fuel combustion emissions

One of the key "fingerprints" of human influence in the rise of atmospheric carbon dioxide is the declination in d13C, the ratio between 13C/12C.

Fossil fuels are supposed to have more of the carbon-12 isotope in comparison to the carbon-13 isotope compared to what's "average" in the atmosphere prior to burning. Hence burning fossil fuels should decrease the 13C/12C ratio. And this is what's found.

But while human emissions of CO2 from fossil fuel combustion are only increasing with time (you should see what China's doing)...

29 November 2015

Torturing the data to get the trend you want

"The cherries are picked mainly on the plains..."

Feldman et al 2015 (link) [1, 2] is supposed to be one of these 'smoking guns' of CO2-induced doom Team Consensus likes to refer to [3, 4]. Here's a graph from that paper.

At first glance a few things seemed odd:

28 November 2015

Harries et al 2001 corrected graphs

The labels were switched on graph 1a. So I switched them back to correct them. You can verify that the graph is now correct considering the difference graph figure 1b:


27 November 2015

The broken pea shooter

I've been looking into so-called smoking gun of greenhouse gas absorption: Harries et al 2001, and came across a rather hard to obtain, obscure 2003 follow-up paper by Harries co-authored with Brindley that basically nullifies the 2001 finding.

The paper is called Observations of the Infrared Outgoing Spectrum of the Earth from Space: The Effects of Temporal and Spatial Sampling by Brindley and Harries (hereafter B & H 2003).

Turns out sampling limitations (etc) in the later 1997 IMG instrument gave rise to errors that effectively nullify the following graph (as depicted on the SkS website):

17 November 2015

RSS Satellite Temperature Lower Troposphere Australia

Now that I can open NetCDF files in Matlab I can look at various climate-related data files and reveal data by longitude and latitude, kind of like Steven Goddard does only not as good.

You can get the data for RSS TLT here:



Using the file:
"uat4_tb_v03r03_anom_chtlt_197812_201509.nc3.nc" I can dial in any latitude and longitude or area.

First, for comparison sake here's what I get averaging the whole earth:

31 October 2015

Difference in longwave radiation between top and bottom of atmosphere

I downloaded data from 1979 to today of NCEP reanalysis-2 of upward longwave radiation from this page. Look for the files that are about 30MB in size.