Daily temperature range (DTR), max minus min, some ramblings

Philip B commented on “Climate predictions “right only half the time””

Warwick you wrote:

Since the nighttime temperatures are rising three times as fast as the daytime temperatures (Karl et al., 1993), it implies a non-climatic signal in the nighttime data equal to about one half of the total warming. It implies the reported global warming of 0.6 C in the twentieth century should be reduced to about 0.3 C.

Have you seen the analyses of Australia temperature data at Gust Of Hot Air?

It shows that rising minimum temperatures are giving a false impression of rising nighttime temperatures, which are rising much less than the minimum, in a number cases there is no rise at all even though the minimum is rising.

It is hard to avoid the conclusion that rising minimum temperatures reflect increased daytime warming and not increasing nighttime temperatures. As well as that increasing minimum and maximum temperatures are showing more heat gain to the system than there is.

After replying, I thought we needed a new thread

You had me searching for that quote Philip. It is on a page written by Dr Doug Hoyt, just above his references.

I agree with his thrust there as I have thought for years now that IPCC supportive scientists have attributed DTR closure to a greenhouse signal when in fact it is exactly a UHI signal – which they always manage to either ignore, trivialise or minimise in some way.

In the early 1990’s I assembled data from various Southern Hemisphere remote locations and oceanic Islands and found no DTR closure.

I have just posted a page listing reviews with links to comments of mine on some papers by the “great and good” of IPCC climate science. Coincidentally the Karl et al 1993 paper in BAMS is on the list.

Naturally I am very interested in Jonathon Lowe’s detailed analyses of Australian data and his finding that what we have thought of as warming minimums is in fact from increased warming in early morning sunshine.

Hope I have not got that wrong.

I have this on my list of things to do and need to clear my decks and devote at least half a day to going through what he has done step by step. Then seek out some long time series of T logging at frequent intervals through the day and examine some data myself.

Here are just three links to some of Jonathon’s posts on the subject from last month.

Statistical Proof of sun caused global warming in South Australia Part II

May 04, 2007

Statistical Proof of sun caused global warming in South Australia Part I, May 03, 2007

Maximums and Minimums, May 2, 2007

Thanks for your comment Philip and if people want to comment on Jonathon’s posts they should do so over at Gust of Hot Air.

2 thoughts on “Daily temperature range (DTR), max minus min, some ramblings”

  1. Warwick

    I just got the faulty T logger back and can record some data here at Halls Creek if you want.

  2. Hope I have not got that wrong.

    You have it right.

    Apart from the fact there is a false impression of warming, it begs the question what could cause increased daytime warming especially in the early morning together with increased nighttime cooing.

    I think it has to be the atmosphere is more transparent to radiation both incoming amd outgoing, especially solar radiation passing obliquely through the atmosphere. Clouds and particles/aerosols are the obvious candidates.

    What is especially interesting about some of Jonathan’s sites (such as those in outback Western Australia) is they are remote from any urbanisation effect and human land use changes.

    While, I can’t say the record isn’t being affected by someone parking their ute next to the recording station, they should be free of the problems they are finding over at Climate Audit.

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