RClimate Script: Arctic Sea Ice Extent Trend By Month

This RClimate Script lets users retrieve and plot the latest data on Arctic Sea Ice Extent  trends by month from 1979 to latest completed month. The trend chart shows National Snow and Ice Data Center’s (NSIDC)  monthly Arctic Sea Ice extent data.

Arctic Sea Ice Trend by Month

I’ve discussed the Arctic sea ice extent trends in this earlier post.

Here’s NSIDC’s Arctic  sea ice extent trend by month chart  since 1979.

This chart shows the 12 monthly sea ice extent trends, with the latest completed month highlighted in red.

Here are the data and RClimate Script links:

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3 responses to “RClimate Script: Arctic Sea Ice Extent Trend By Month

  1. Pingback: Tracking JAXA Arctic Sea Ice Extent Trends « Climate Charts & Graphs

  2. Pingback: Meteorologist Misreads Arctic Sea Ice Extent Trends « Climate Charts & Graphs

  3. Olly Burnett-Hall

    Plotting the sea ice trend broken out by month is the correct thing to do here, but I feel that having the lines close together and overlapping reduces the chart’s clarity.

    An alternative is to use a cycle plot/month plot — something like this (which uses the ‘sie’ dataframe from your script):

    # add NA values for missing Dec-1987 and Jan-1988 readings
    sie.continuous <- rbind(sie[sie$yr_frac1988,])

    sie.ts <- ts(sie.continuous$ext, frequency=12, start=c(1979,1))
    monthplot(sie.ts, ylim=c(0,17), base=function(x) { mean(x, na.rm=T) } )

    - olly

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