the Air Vent

Because the world needs another opinion

Posts Tagged ‘global’

Evidence of Sea Contamination In Antarctic Sat Data

Posted by Jeff Id on March 16, 2009

Know your data!

It’s the first rule of any engineering project you undertake. Mistakes often happen at the base level of data collection, errors in the early stages propagate through a project once the data is accepted, the effects of which are often misunderstood or unquantified. Nobody is immune to this of course, it’s just a point I want to make. From an engineering standpoint, it means heavy verification, often multiple times until you’re sure that your answer is reasonable. In my world if I’m wrong, things don’t work and big money is flushed down the toilet. In climatology if they are wrong and it is pointed out, there is little recourse or concession of the mistake. It would just be another messed up science if the politicians and polyscienticians weren’t forcing ridiculous policies down our throats, but that’s another story.

Jeff C found a site on the NSIDC where they provide AVHRR satellite data from 1982 to 2004. This data is monthly data which means daily cloud masking and error correction have already occurred. The masking is different than Steig used in his Antarctic paper and it may have had a substantial impact but at least we have a point of reference. There are several questions to answer, are 3 pc’s enough to represent the data, are the trends similar to the presented trends, are there other problems in the data.

Honestly, I’ve spent many hours now looking at the data and while I don’t have the answers to all these questions, there will be some interesting things over the next week or two. I really need to send Christmas cards to the team for all the entertainment they provide.

Jeff C deserves enormous credit for accessing and processing the data, we did work on it together but there were big hours spent in analysis and verification. Anyway, instead of getting too far ahead of myself and into some of the incomplete but still interesting finds I’ve decided to catch my readers up.

Below is a movie of the skin surface temperature of the Antarctic. Watch the video a couple of times and you may see some interesting features.

sat-data-movie

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Antarctic Temperature RegEm Forensics

Posted by Jeff Id on February 13, 2009

Thanks to Molan Labe who was quite helpful in identifying what I believe is the correct coefficient into regparm for the purposes of recreating the RegEm calculations. After some considerable time I am still not able to recreate the results of Steig’s paper perfectly, but as you can see below, I am fairly close.

First let’s look at the mean trend of the reconstructed AWS station data by Steig. All data used was from the Climate Audit directory (thanks to Steve McIntyre) so the updated reconstructions and data are not involved.

steig-recon-trend-a

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Surface Station Data

Posted by Jeff Id on February 12, 2009

Surface stations were used in the Antarctic with RegEm to infill satellite and AWS data for the establishment of the warming trend.  This is the data used in the final reconstruction.  It is much more complete than the AWS data so I plotted all of the trends to see what they look like.  I had to calculate my own anomaly this time so I used a monthly mean method and subtracted it from the temp data to create the black curves below.  These plots are typical to the data and represent the set  pretty well as far as completeness.

surface-anomaly-vs-surf-dat-89022

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Arctic Sea Ice Increases at Record Rate

Posted by Jeff Id on February 3, 2009

Something I’ve been interested in for the last several months is sea ice data. What makes it interesting is that as I understand it, models demonstrate the poles should be most sensitive to global warming leading the planet temp, especially in the Arctic. Recently I have been able to process the monthly and daily gridded arctic data as provided by NSIDC. The daily values allow a better analysis of trend than can be provided by the monthly data.

If you’re like me you recall the claims of fastest melt rate ever were made about 2007 , I fully believed them, because the graphs showed a much more negative value than in the previous 30 years as shown in Figure 1 below.

06-07-ice-area1

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Satellite Temp. Homoginization Using GISS

Posted by Jeff Id on January 19, 2009

RSS and UAH have differing 30 year trends which lie outside my calculated measurement error for the data. Subtraction of the two measures leaves a step located at about 1992. Since they both use the same dataset, the question becomes. Which series is right?

After reading several papers and some short emails to some smart people, I have come to understand the bulk of the trend difference to this single step point in the data which corresponds to the time when satellite NOAA-12 began adding data into the trend.

Below is a graph of the RSS-UAH data where the step is quite visible. The flatness of the slope on either side fo the step is a good indicator that most of the data is in good agreement between the satellite processing algorithms.

rss-uah-data

The graph below is a plot of the raw data and a filtered difference and the overall trends of the data. You can see the trends are crossed and divergent.

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NSIDC Issues Corrections to Webpage

Posted by Jeff Id on December 24, 2008

Based on The Air Vent post carried by Watts Up With That, the National Snow Ice Data Center has issued several corrections to the documentation of their sea ice area time series.

Most will remember my earlier post which plotted global sea ice trends. After initially concluding that the global ice level wasn’t decreasing measurably Tamino pointed out a problem in my analysis. After issuing my corrections, thanks and apologies to Tamino and the um…..thousands of readers of Watts Up With That, I went back to work investigating what was really happening to the ice area time series.

It was actually quite lucky that Tamino mentioned the step in the data and criticized me for not reading carefully (something which was mentioned in several comments on the various threads). When I first learned of it, I found the criticism was based on an entirely different set of ice area data with different source documentation. Still, I checked closely and found the tiny step in the time series and was convinced that I had missed something. I had spent a huge amount of time learning the data before I made my post so it was frustrating to say the least. Understand, I used several resources to check my work; not the least of which was the National Snow Ice Data Center (NSIDC) anomaly graph which has the same shape as the one I generated.

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Here Comes the Snow

Posted by Jeff Id on December 21, 2008

Yeah, you can tell from the title I live on the topside of the world. A bit egocentric for sure but the winter is setting in here and it’s looking cold. Anthony Watts did a post on PDO (Pacific Decadal Oscillation) which has recently shifted colder. A lesser known form of la nina the PDO is yet another regular oscillation in the weather system. One which doesn’t get the press it deserves simply due to its longer timescale.

pdo

Click on the picture to link to watts up.

The blue wedge region surrounded by the green is apparently the typical signature of the PDO cold cycle. What didn’t get enough attention IMO is the trend. By the trend we should have been expecting this event for some time. Fortunately for us, digital diatribes (link on right) kept up with the trend and laid it out several days before the main stream media and Watts Up picked it up. Take a close look at this graph.

raw-pdo

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Left Turn Clyde

Posted by Jeff Id on December 20, 2008

What three things do these three people have in common?

steven-chujohn-holdrenjane-lubchenco

1 – They all have extremist left wing global warming backgrounds.

2 – They all support hard CO2 caps.

3 – They all have been recently nominated to top positions in Obama’s administration.

Click on the pictures for some bio information.

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Satellites Quantify Rainfall/Temp – 5 Times More than IPCC predicions.

Posted by Jeff Id on December 19, 2008

NASA: Global warming to increase severe storms, rainfall

PASADENA, Calif. (AP) — The frequency of extremely high clouds in Earth’s tropics — the type associated with severe storms and rainfall — is increasing as a result of global warming, according to a study by scientists at NASA’s Jet Propulsion Laboratory, Pasadena, Calif.

In a presentation today to the fall meeting of the American Geophysical Union in San Francisco, JPL Senior Research Scientist Hartmut Aumann outlined the results of a study based on five years of data from the Atmospheric Infrared Sounder (AIRS) instrument on NASA’s Aqua spacecraft.

For every 1.8-degree (F) increase in average ocean surface temperature, the team observed a 45-percent increase in the frequency of the very high clouds. At the present rate of global warming of 0.23 degrees per decade, the team inferred the frequency of these storms can be expected to increase by six percent per decade.

Everything was going fine until this last paragraph. Point two three, you sure big guy. Who says point two three, even GISS data only says 0.18/decade. The last decade showed little or no warming whatsoever. A flat line.

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Blogging is Great!

Posted by Jeff Id on December 19, 2008

I’ve thoroughly enjoyed this experience so far. What amazing entertainment, brilliant commentators and excellent drama. It was actually the Digital Diatribes of a Random Idiot which got me to start blogging. Joe’s site, with unique comments and truthful analysis encouraged my start.

I started blogging about energy and ice cores in August. I looked at how different forms of alternative energy have so many problems as related to oil, coal, natural gas and nuclear. After a short time Climate Audit posts led me to dig in to Mann 08 where I discovered deeply (and simplistically) flawed statistics.

Let’s look at some of the bigger events which have happened to the Id.

- Discovery that biofuels, wind power and solar are not technologically ready to replace existing energy sources.

- Uncovering multiple flaws in Mann08. A huge adventure for sure, after all this guy created Albert Gore’s hockey stick graph.

- I found that Mann 08 infilled data, pasting on a hockey stick on the end of 90% of the proxies.

The All Important Blade of the Stick Uses Less Than 5% of the Data

- I learned that Mann 08 used a correlation to temperature to sort proxies and throw out the data which didn’t fit his assumptions. Since this time I learned that this has been proven statistically incorrect by many authors.

Simple Statistical Evidence Why Hockey Stick Temp Graphs are Bent!!

Looking back there are some problems with my statements in this post but the math result was completely accurate.

—-

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A Bit of Backlash to AP Propaganda

Posted by Jeff Id on December 17, 2008

These guys must read the air vent too.

Scientists Call AP Report on Global Warming ‘Hysteria’

Scientists skeptical of the assertion that climate change is the result of man’s activites are criticizing a recent Associated Press report on global warming, calling it “irrational hysteria,” “horrifically bad” and “incredibly biased.”

They say the report, which was published on Monday, contained sweeping scientific errors and was a one-sided portrayal of a complicated issue.

This mirrors my post earlier.

AP Drinkin’ the Global Warming Coolaid

Listen to some of these quotes from this article.

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How Do These Things Happen

Posted by Jeff Id on December 17, 2008

I took some flack on how I missed such an obvious problem in the data. Well, things are rarely as clear as they first seem. Let’s look at the facts, below is a plot of the uncorrected bootstrap data.

ice-area-nh-bootsrtap

See the offset at 1987, no how about the same graph zoomed in.

ice-area-nh-bootsrtap-zoomed-in

There it is, that little scribble after 1987.5. That’s the entire difference between my first and second posts. But it’s worse than just this, here is some text from the actual pages.

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Sea Ice Decreases Despite the Air Vent

Posted by Jeff Id on December 16, 2008

Well tonight I get the great pleasure of redoing a post in the face of an inconvenient truth. To add insult to injury the error in my ways was pointed out by none other than my favorite liberal – Tamino who pointed out this section of the NSIDC data center. How I missed it in the hours I spent reading the site is beyond me. He did owe me one, at least we know he’s reading.

Note that unlike ice extent, the Arctic values for ice area do not include the area near the pole not imaged by the sensor (the “pole hole”). This area is 1.19 million square kilometers for SMMR (from the beginning of the series through June 1987) and 0.31 million square kilometers for SSM/I (from July 1987 to present). Therefore, there is a discontinuity in the “area” data values in this file at the June/July 1987 boundary.

This means that the sea ice area prior to 1987 was actually 0.88 million kilometers higher than the dataset indicated (if we assume 100% filled). Why it isn’t corrected in the data is due to the fact that the actual fill level is less than 100%. This results in an exaggerated downslope. Anyway here’s the new graphs (with a somewhat exaggerated downslope).

Here’s an image from the IUIC cryosphere page first which shows global trend.

global-sea-ice-chart

Here’s the link check it out yourself. This isn’t that different from my original post but there is some down slope.

———————–Results from my exaggerated correction are below. ——————————–

Raw data looks like this after adding 880000 km^2 to the raw data before 1987.

global-sea-ice-nasateam-algorithm-area2

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AP Drinkin’ the Global Warming Coolaid

Posted by Jeff Id on December 15, 2008

It’s me mad again, these articles get worse every day the earth cools.

Obama left with little time to curb global warming

Since Clinton’s inauguration, summer Arctic sea ice has lost the equivalent of Alaska, California and Texas. The 10 hottest years on record have occurred since Clinton’s second inauguration. Global warming is accelerating. Time is close to running out, and Obama knows it.

Is global warming really accelerating?

uah-anomaly

Graph courtesy of Joe at digital diatribes (link on right).

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Global Sea Ice Increased Over 28 Years

Posted by Jeff Id on December 14, 2008

This post contains an error in data interpretation. The NSIDC provides the data in a continuous time series, in their well documented site they describe an upgrade in satellite at 1987 which resulted in an upward offset in the data prior to 1987. Despite hours reading the website I somehow missed this offset which makes my analysis incorrect. Sea ice totals have decreased as advertised although the trend is less than we hear. Sorry for the confusion.

Jeff Id

——————————————————————————–

I calculated a true global sea ice anomaly in this post using the National Snow Ice Data Center data. What would you say if I told you that over the last 30 years the sea ice area has stayed flat or even trended — Up!!!???

This isn’t a small deal. We have been told, well screamed at really, that CO2 is causing unprecedented rise of temperature on a global scale. We hear constantly that the ice is melting and the result will be dramatic flooding of the earth; movies have even been made. Those of us who pay attention to the scientists have heard that the most significant warming will be at the poles (according to the computer models). We also hear that the Antarctic has added ice during the same time the Arctic lost sea ice. This is explained in that the Antarctic ice increase is a local situation and the Arctic ice loss is a result of global warming. A unique form of cherry picking but should be treated with an open mind.

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