JISAO data
"Global Warming" time series and analyses
This page provides WWW addresses for time series of global, hemispheric, or regional surface temperatures so that users can perform their own analyses of recent and historical changes in surface temperature.




Time Series






Surface temperatures


Layer-mean atmosphere temperatures









Analyses







The following three analyses are from the National Academy of Sciences report "Reconciling observations of
global temperature change."  You could update the first and most of the second
analysis using data at the above the URLs.  The balloon (also known as
radiosonde) data and
tropical means in general do not seem to be easily available on the
WWW.  If you do make an updated version of one of these analyses,
please send it along, preferably as a PostScript or JPEG file, and
I'll add it to the page.




Global-mean surface temperature anomalies, 1880-1999



PostScript | JPEG


The time series is the average of both land and sea measurements, and
the values are averages for 4 seasons each year (December-January-February,
March-April-May, June-July-August, and September-October-November).
The ordinate tick interval is 0.3C.  
This analysis is Figure 2.1 in "Reconciling observations of
global temperature change."

An ASCII file with the data used for this plot
is linked here.  NaN is no data, so no
value is given for December1879-January1880-February1880.  The first
season with data is the average for March-April-May 1880 (-0.15C) and the last
season with data is September-October-November2000 (0.41C).







Global-mean temperature anomalies, 1979-99



PostScript | JPEG


Seasonal-mean lower atmosphere (troposphere) temperatures from satellites (red) and
balloons (green), and surface air temperatures (black).  The ordinate
tick interval is 0.25C.  The satellite data are the microwave sounding
unit (MSU) "2lt" estimates.  
This analysis is Figure 2.3 in "Reconciling observations of
global temperature change."

An ASCII file with the data used for this plot
is linked here.  The columns are ordered: satellite (MSU),
balloon, and surface temperatures (C).  NaN is no data, so no
values are given for December1978-January1979-February1979.  The first
season with data are the averages for March-April-May 1979
(-0.106, -0.206, -0.240 C) and the last
season with data are the averages for December1998-January1999-February1999.







Tropics-mean temperature anomalies, 1979-99



PostScript | JPEG


As in above figure but for means of the tropics (20N-20S).  This analysis is Figure 2.4 "Reconciling observations of
global temperature change."

ASCII file with the data.






The following analysis was motivated by a similar analysis by James Hansen (jhansen@giss.nasa.gov) and
collaborators at the NASA Goddard
Institute for Space Studies.



Mean December through April Surface Temperature Anomalies, 1979-80 through 1996-97



PostScript | JPEG


Northern Hemisphere Winter-Spring surface temperature anomalies for
the previous 18 winters, and the mean of the 18 winters (last panel).
Blue (red) shading indicates temperatures cooler (warmer) than the
1950-80 climatology.
The data is available online.
NetCDF files of the DJFMA-mean digital values are available for the individual years and the  mean for 1979-97 (both <1 Mbyte).  It
would be fun to update this analysis, and I will update it eventually.









Mean December through April Surface Temperature Anomalies, 1979-97



PostScript | JPEG


This is just an enlargement of the last panel of the preceding figure.












June 2001
Todd Mitchell (mitchell@atmos.washington.edu)


JISAO  data