Category Archives: Climatechange

Mapping Temperature Anomalies with R: UPDATE 12/17/13

In this post I show how to map NASA GISS’s  2×2 degree temperature anomaly data using R mapping tools. Rather than rely on a single value to reflect monthly global temperature anomaly, this map shows the anomalies  in each of the 16,200 cells in a  2 degree lon/lat grid. This lets us see the details that make up the global mean, we can see which areas are warmer and which are cooler.  I provide a link to my RClimate script and data file so that interested R users can make their own maps.

Here’s my R Climate map of NASA’s July 2010 2×2 degree data set. (Click map to check out the enlargement )

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Global Warming in My Lifetime – July’s Story

NASA GISS has a great web application that let’s users generate  maps of global monthly temperature anomalies in 2 degree grids.  I’ve made a 27 second video of 7 decade maps for July to see how global temperature anomalies have progressed through my life so far.

Here’s the link to NASA GISS’s map application page. It’s very easy to use.

My video shows 7 maps, each showing the July average for each of the 16,200 grid cells (2×2 lat/lon).
Click to play


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Enhanced UAH Channel 5 Temperature Anomaly Trend Chart: Update 1

This post discusses my updated and enhanced UAH Channel 5 daily trend chart. Updated 3/29/11

Update 1: 3/29/11

Since I have received a number of comments and questions about this post, I am updating it to address these comments and improve the chart.

I plot the Channel 5 data because it is available in rear real time so that readers can get a sense for how the monthly global temperature anomaly is shaping up. However, the comments tell me that there is some confusion about Channel 5 and how it compares to the UAH TLT data.

Lucia at The Blackboard has a detailed discussion of UAH TLT and Channel 5 here. Bob Illis has an interesting chart that shows the differences between UAH TLT and Channel 5 here.

Dr. Roy Spencer discussed tracking daily global temperature anomalies here.

I have revised my chart to show both the UAH TLT 5.4 and Channel 5 monthly trends as well as the daily Channel 5 data for the current month.

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Original Post

I’ve added this UAH Channel 5 trend chart to my sidebar:  (Click to enlarge)

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Comparing 2010 and 2007 Arctic Sea Ice Extent Trends

See my Arctic Update Page for daily updates on Arctic Sea Ice Extent

In this post I present a chart that tracks the daily Arctic Sea ice Extent (SIE) for 2007 and 2010. I chose 2007 as the comparison year because it had the record minimum and I wanted to be able to directly compare 2010 with the record minimum year to get a quick comparison of 2010 with the minimum year.

I will update this chart regularly on my Arctic Update page to help Arctic Sea Ice observers  get a quick sense of the 2010 – 2007 comparison.

2010 – 2007 Comparison Chart

Here’s my R based 2010 – 2007 Arctic SIE extent chart. (Click image to enlarge)

I’ve added a number of features to this chart to help me quickly asses the situation:

Arctic Sea Ice Extent Update – June, 17, 2010: Update 2

See my Arctic Update Page for daily updates on Arctic Sea Ice Extent

We are at the half way point in June, 2010 and the Arctic Sea Ice Extent is melting at a record-breaking pace. Please note I have adjusted my post based on JAXA’s 6/15/10 data update.

I have added a new page – Arctic Update where I will regularly have the latest JAXA day of year chart, my month to date data table and my month to date Sea Ice Extent chart. 6/17/10

Here’s the JAXA day-of-year chart which clearly shows how ASIE has dropped dramatically in May and so far in June. The mid June levels are the lowest in JAXA’s 2003-2010 period.

Here’s my JAXA data trend chart which shows the daily June values for each year. The blue dots reflect the daily values and the red dots reflect the ASIE values for the latest data date for each year. The green line is intended to assist reader in comparing the same values for the same data in each year.

Clearly the June 2010 ASIE is dropping rapidly, with the 6/15/2010 value significantly less than the values on this data in previous years.

This table provides additional information on the magnitude of the June ASIE decrease.

June, 2010 started at the lowest point in the 2003-2010 period, 32,000 km^2 less than the previous June 1 low in 2003.  So far in the first half of June, 2010, ASIE has decreased 0.898 million km^2, beating the previous full June record of 0.797 million km^2.  The mid June 2010 rate of  decrease has been 60,000 million km^2 per day, considerably greater than the previous maximum mid June rate of 53,000  in 2008. (Corrected 7/7/10 based on Derek McCreadie comment)

Details on my RClimate script are available in this previous post.

Tracking JAXA Arctic Sea Ice Extent Trends

See my Arctic Update Page for daily updates on Arctic Sea Ice Extent

Arctic Sea Ice Extent (SIE) follows an annual cycle, with maximum levels usually in March and minimum values in September.  Many analysts use day-of-year charts to compare the SIE cycle by years so that they can assess the current years trend with previous years. In this post, I present an alternative to the day-of-year chart which shows the daily values a calendar month previous years and the current year.

Arctic Sea Ice Extent (SIE)

I have discussed Arctic Sea Ice Extent (SIE) here and here. Both of those posts used the NSDIC monthly Arctic SIE data. In this post, I use the Japan Aerospace Exploration Agency (JAXA) daily data series, available at this link.

Here’s the JAXA day-of-year chart . Click image to enlarge.

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Climate Oscillations and GISS Temperature Anomaly Trends

In this post, I examine the combined impacts of Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO) and El Nino – Southern Oscillation (ENSO)   on the long-term GISS Land and Ocean Temperature Anomaly (LOTA) trend.

Introduction

Professor Don Easterbrook of Western Washington University  has stated …

“The PDO cool mode has replaced the warm mode in the Pacific Ocean, virtually assuring us of about 30 years of global cooling, perhaps much deeper than the global cooling from about 1945 to 1977.”  source

Easterbrook’s PDO theory is repeated  here and here. Clearly he believes that the shift in PDO phase from warm to cool will have a significant impact on global temperatures for the next 30 years.

In this post I take a closer look at PDO, AMO and ENSO indexes to see how they are related to the GISS anomaly trends.

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