Climate Conversation Group

Professor de Freitas from time to time advises the NZ Climate Science Coalition, but he does not speak for it. Nevertheless, this op-ed in today’s Herald gives such a clear view of the issues touching our court case that it deserves a hearing here.

– by Chris de Freitas, Associate Professor, School of Environment, University of Auckland.

One assumes scientific analysis is objective, so it may come as a surprise that this was challenged in a New Zealand High Court case, the results of which were released last week.

The New Zealand Climate Science Education Trust (NZCSET) contested the claim by the National Institute of Water and Atmospheric Research (Niwa) that New Zealand air temperatures had climbed by 0.9°C over the past century. The trust maintains that objective analysis of the data shows a trend closer to 0.3°C per 100 years. Read more… »

Professor Chris de Freitas

This post could be considered tardy. However Donna Laframboise’s illuminating comments lose nothing with the passage of time. They deserve circulation and Auckland’s possibly best-known sceptical climate scientist deserves her thoughtful and eloquent support.

Four weeks ago, on July 16, the Herald published Chris Barton’s attack on Chris de Freitas’s integrity. The next day I posted a defence of a scientist who has given a lot of help to any number of keen climate amateurs like myself and has the courage to say out loud that things are not scientific if to him they appear in fact to be unscientific.

About a week later the uncompromising Laframboise posted a perceptive analysis of Barton’s attempted “critical thinking”. I encourage you to read the whole thing if you have a few minutes. Read more… »

de Freitas feeds his students sceptic propaganda …

So says the radical Renowden, he of the non-sceptical “believe everything they say” warmist persuasion. But read what he says about Chris de Freitas’ crimes and you’ll realise he says nothing, because no crimes exist.

Gareth Renowden is himself guilty of attempting to abridge the academic freedom to study and teach inconvenient facts.

It’s all arm-waving, and Renowden cites nothing in the Geography 101 course that’s untrue. He says many unkind things about the graphs and their provenance, but he never says they’re wrong, and that’s a strange thing to forget, which means he didn’t forget it — he omitted it, because they’re not wrong. Read more… »

What is weather?

(h/t Bob D for most of the references)

Journalist Chris Barton has a story in yesterday’s Herald titled The climate dissenter holds his ground. After looking at Barton’s alarmist arguments I’ll stand with Chris de Freitas on the solid ground.

The story begins with the implication (not that the journalist says it this plainly) that, even with the planet battling weather extremes, that is not enough to convince an Auckland climate scientist (Associate Professor Chris de Freitas, at the University of Auckland) of the truth of human-induced global warming. We’re supposed to feel exasperation: “What will it take to get that man to see sense?”

But Barton is dead wrong. For why should “extreme” weather be an indication of man-made global warming? How could we get more extreme weather out of global warming? Read more… »

From the pen of Chris de Freitas comes this short but compelling narrative, inspired and inspiring, and calming, like a cool balm on an inflammation. Read it and watch the heat from the global warming debate dissipate and important issues clarify. Reprinted here with Chris’ kind permission.

Chris de Freitas: Emotion clouding underlying science of global warming

First published in the NZ Herald, 5:30 a.m. Wednesday Jan 5, 2011

by Dr Chris de Freitas

Professor de Freitas

Unlike most other hot-button environmental issues, global warming is widely misunderstood. As a climate scientist, thinking about this, it struck me that it was not surprising, since accounts of the scientific basics of global warming almost never appear anywhere in the press.

There is not space here to include all the charts and numbers that might accompany such an account. In their place is a necessarily brief summary.

Most people are not shocked to learn that global warming discussions evoke polarised views, but many are surprised to discover that the scientific basics are not contentious. An awareness of these is helpful in building an understanding of the extent to which there is a problem and how it might be addressed. Read more… »

Chris de Freitas takes aim at decision-makers who should know, but apparently don’t know, what they’re doing. If they don’t squirm on reading this stinging criticism, then surely they possess no conscience. Let us hope they’re strong enough to honestly re-evaluate their position. I’m posting his article in toto; crafted with the best possible reasoning, it deserves the widest possible circulation.

Published in Energy New Zealand, Sept 2009.
by Chris de Freitas

Bias or blindness… emission targets

THE KYOTO PROTOCOL, an icon of the global environmental movement, is soon to be replaced by a more radical international treaty to curb greenhouse gas emissions.

What it will involve depends on the outcome of negotiations that begin this December in Copenhagen. In preparation, the Government has committed New Zealand to cut up to a third of current emissions by 2020.

The economic, social and moral implications are immense, since carbon taxes and tradable emissions alone cannot make such a massive reduction. Sweeping legislation restricting the use of oil, coal and natural gas would be required, along with far-reaching reforms in pastoral farming to cut methane release. Read more… »

Now the cat is put among the pigeons.

Research recently completed by two Kiwis and an Aussie reveals that natural forces are the dominant influence on climate. They say little or none of the late 20th century global warming and cooling can be attributed to human activity.

John McLean, Chris de Freitas and Bob Carter published their paper, “Influence of the Southern Oscillation on tropospheric temperature”, in the prestigious Journal of Geophysical Research on July 23, 2009.

“The surge in global temperatures since 1977 can be attributed to a 1976 climate shift in the Pacific Ocean that made warming El Niño conditions more likely than they were over the previous 30 years and cooling La Niña conditions less likely” says co-author de Freitas, quoted at Climate Depot.

“We have shown that internal global climate-system variability accounts for at least 80% of the observed global climate variation over the past half-century. It may even be more if the period of influence of major volcanoes can be more clearly identified and the corresponding data excluded from the analysis.”

That’s all for now; more later.

UPDATE: 24 July 2009, 23:59

This is one of those (apparently) rare things in the climate debate: a peer-reviewed paper that casts doubt on the theory of strong anthropogenic global warming. Here’s hoping the alarmists note this new paper and grant it the respect it deserves without heaping the authors with ad hominem insults, though I’m not holding my breath. Please note that by ‘respect’ I mean refuting it with observation and reason, not hyperbole and obfuscation.

Abstract

J. D. McLean, C. R. de Freitas, and R. M. Carter
Received 16 December 2008; revised 23 March 2009; accepted 14 May 2009; published 23 July 2009.

Time series for the Southern Oscillation Index (SOI) and global tropospheric
temperature anomalies (GTTA) are compared for the 1958–
2008 period. GTTA are
represented by data from satellite microwave sensing units (MSU) for the period
1980–2008 and from radiosondes (RATPAC) for 1958–2008. After the removal from the
data set of short periods of temperature perturbation that relate to near-equator volcanic
eruption, we use derivatives to document the presence of a 5- to 7-month delayed close
relationship between SOI and GTTA. Change in SOI accounts for 72% of the variance
in GTTA for the 29-year-long MSU record and 68% of the variance in GTTA for the
longer 50-year RATPAC record. Because El Niño
Southern Oscillation is known to
exercise a particularly strong influence in the tropics, we also compared the SOI with
tropical temperature anomalies between 20
S and 20
N. The results showed that SOI
accounted for 81% of the variance in tropospheric temperature anomalies in the tropics.
Overall the results suggest that the Southern Oscillation exercises a consistently dominant
influence on mean global temperature, with a maximum effect in the tropics, except
for periods when equatorial volcanism causes ad hoc cooling. That mean global
tropospheric temperature has for the last 50 years fallen and risen in close accord with
the SOI of 5–7 months earlier shows the potential of natural forcing mechanisms to
account for most of the temperature variation.

Citation: McLean, J. D., C. R. de Freitas, and R. M. Carter (2009), Influence of the Southern Oscillation on tropospheric temperature, J. Geophys. Res., 114, D14104, doi:10.1029/2008JD011637.