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Northen hemisphere ice and snow area, first look

September 7, 2013 Leave a comment
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Figure 1

Hemisphere area coverage of snow and ice for land and ocean. Early data has been excluded after discovering an anomaly with early daily sea ice data, excluded is early part which is every other day data.[1]

This is an experimental first attempt at creating a hemisphere ice coverage dataset.

Why? I don’t like hidden information, want to see for myself and perhaps shed more light on whatever is going on.

As with sea ice data there is a distinct increase in the amplitude of the annual cycle in recent years. No attempt has been made to produce a more regular annual cycle exclusion.

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Categories: analysis, sea ice

Sea ice oddity on ratio of extent to area

July 20, 2013 1 comment

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Whilst looking at other things I checked the monthly data ratio of sea ice extent to area. This might interest others so here it is.

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Categories: sea ice

Dubious Arctic ice data does not support the official storyline

July 12, 2013 Leave a comment
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Figure 1

Figure 1 is demonstrating the impossibility of the commonly provided assertions by the scientific community of an exponential or similar melt away of Arctic ice. A very precise (13 term) annual cycle has been hindcast from daily data back into detrended monthly data. The model was rebased to monthly and subtracted from actual monthly data.

Any curvature must appear in one or both of the straight line trend or residual. It does not.

Figure 1 also exhibits the satellite usage timeline. Each one of these satellites occupied a different orbit, all but one definitely a decaying orbit leading to Nyquist issues which are liable to alias to a long term trend. The instruments carried were all different and used different processing software. All instruments had a different observation field geometry. Human judgement has been used to attempt filling in where sensing surface polorisation destroys contrast, sea surface and ice looking the same. Modelling is used where there is unknown data. And other issues.

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Categories: sea ice

JAXA inserted new AMSR2 into A-Train orbit

June 16, 2013 Leave a comment

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Image from JAXA press release

I’m late to this news from Japan. Middle 2012 JAXA launched SHIZUKU satellite where a major feature is an AMSR2 instrument, which I assume is a replacement for the highly successful instument which failed (scan bearing failure). Insertion into the A-Train string of satellites makes this orbit compatible.

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Categories: Satellites, sea ice

How polar ice is modulated by the sun

April 30, 2011 9 comments

What follows here is a demonstration of how earth orbit shapes Arctic ice and in a later post I intend to show how this may well relate to palaeoclimatology shown in ice cores.

You will have seen the plots of Arctic sea ice. I am going to use one dataset here, which one is unimportant, others give the same answer.

Arctic sea ice extent, monthly data

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Categories: analysis, filtering, sea ice, solar

Arctic UAH TLT polar temperature plots

November 28, 2010 Leave a comment

Discussion on the Bishop’s blog could useful use plots of UAH lower troposphere data and since I can do this, two plots follow.

http://www.bishop-hill.net/blog/2010/11/27/the-arctic-gap.html

Both the following are rotated to roughly match the plots cited in the other blog.

Actually used, looks like 90,30 which is 30 degree clockwise, plot range +-4C, disc is for whole earth equal area:

lua query.lua uahtlt render year=2010 month=10 centre=90,30 size=1024,768 range=4 lamaz

Sept 2010

Sept 2010

Oct 2010

Oct 2010

This was all done quickly and I couldn’t remember how to do it! No doubt could be improved.

I am not looking for comments here.

Categories: sea ice, UAH