date: 23 Dec 1996 16:20:33 -0700
from: Tom Wigley <Tom_Wigley@qgate.ucar.edu>
subject: Re: MAG Output
to: Mike Hulme <m.hulme@uea.ac.uk>

                      RE>>MAG Output                               12/23/96

Dear Mike,

The CO2HIST.IN file I sent, which says "as used by IPCC1995" is the correct
one to use.  The Etheridge file is an updated (and better data set)---but this
is not the one you should use.

Happy Christmas and best wishes,
Tom

--------------------------------------
Date: 12/20/96 5:41 PM
To: Tom Wigley
From: Mike Hulme
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Date: Sat, 21 Dec 1996 00:31:57 +0000
To: Tom Wigley <Tom_Wigley@qgate.ucar.edu>
From: Mike Hulme <m.hulme@uea.ac.uk>
Subject: Re: MAG Output

Tom,

Sorry about the output size.  Mike is using a compressed format o/p to save
paper - it is obviously too compressed!

Looking through your data files there is a difference between the CO2HIST.IN
files pre-1964.  Your concs. are lower than ours (sometimes by 2-3ppmv) over
most of the pre-1964 period.  Your file states 'as used by IPCC1995' whereas
ours says 'as given in Etheridge et al. and merged with IPCC1995 data, March
1996.'  Also, MAG.F was altered 26 February 1996 to read CO2 history from
the file CO2HIST.IN rather than from a DATA statement.  These differences
would explain the different CO2 forcing in your and our runs, a difference
which diminshes to near zero during the 21st century (consistent with the
fact noted above that i/p CO2 concentrations after 1964 are identical).
Should we be using your CO2HIST.IN file or the one we have?

The other difference I can find is, as you say, due to Mike having ITAUMETH
set at 2 rather than 3.  This alters the CH4 and TROPO3 forcing after 1990.

I now have the MAG code from Mike and the other matters now seem clearer to
me.  If you can confirm this is the likely difference then please email me
your CO2HIST.IN file and we can test it (the one in the email has lots of
carriagecontrols in it) or else you can try get our results using our
CO2HIST.IN file below.

We will change ITAUMETH to 3.

I hope this resolves the issue.

Merry Christmas to you and Astrid and the children.  We say Helen Dorday the
other day and she sent her greetings to you and Astrid.

MIke


  1764   277.487
  1765   277.607
  1766   277.732
  1767   277.862
  1768   277.997
  1769   278.137
  1770   278.282
  1771   278.432
  1772   278.586
  1773   278.744
  1774   278.905
  1775   279.070
  1776   279.237
  1777   279.405
  1778   279.575
  1779   279.745
  1780   279.915
  1781   280.087
  1782   280.261
  1783   280.439
  1784   280.621
  1785   280.809
  1786   281.001
  1787   281.195
  1788   281.392
  1789   281.590
  1790   281.788
  1791   281.985
  1792   282.179
  1793   282.371
  1794   282.559
  1795   282.743
  1796   282.921
  1797   283.093
  1798   283.257
  1799   283.411
  1800   283.556
  1801   283.691
  1802   283.817
  1803   283.933
  1804   284.041
  1805   284.141
  1806   284.233
  1807   284.317
  1808   284.392
  1809   284.459
  1810   284.518
  1811   284.573
  1812   284.625
  1813   284.675
  1814   284.725
  1815   284.775
  1816   284.825
  1817   284.875
  1818   284.925
  1819   284.973
  1820   285.017
  1821   285.055
  1822   285.080
  1823   285.089
  1824   285.076
  1825   285.040
  1826   284.981
  1827   284.898
  1828   284.795
  1829   284.675
  1830   284.541
  1831   284.393
  1832   284.231
  1833   284.059
  1834   283.885
  1835   283.730
  1836   283.600
  1837   283.495
  1838   283.420
  1839   283.385
  1840   283.395
  1841   283.445
  1842   283.535
  1843   283.660
  1844   283.810
  1845   283.975
  1846   284.145
  1847   284.320
  1848   284.495
  1849   284.659
  1850   284.810
  1851   284.945
  1852   285.075
  1853   285.210
  1854   285.350
  1855   285.500
  1856   285.659
  1857   285.825
  1858   285.990
  1859   286.150
  1860   286.305
  1861   286.445
  1862   286.575
  1863   286.700
  1864   286.815
  1865   286.930
  1866   287.050
  1867   287.170
  1868   287.300
  1869   287.445
  1870   287.610
  1871   287.795
  1872   288.000
  1873   288.235
  1874   288.510
  1875   288.825
  1876   289.175
  1877   289.575
  1878   290.020
  1879   290.490
  1880   290.970
  1881   291.450
  1882   291.915
  1883   292.355
  1884   292.760
  1885   293.120
  1886   293.435
  1887   293.705
  1888   293.930
  1889   294.115
  1890   294.270
  1891   294.395
  1892   294.505
  1893   294.610
  1894   294.710
  1895   294.825
  1896   294.965
  1897   295.140
  1898   295.360
  1899   295.625
  1900   295.935
  1901   296.280
  1902   296.650
  1903   297.040
  1904   297.445
  1905   297.855
  1906   298.265
  1907   298.675
  1908   299.080
  1909   299.480
  1910   299.865
  1911   300.235
  1912   300.590
  1913   300.925
  1914   301.250
  1915   301.570
  1916   301.890
  1917   302.215
  1918   302.545
  1919   302.880
  1920   303.225
  1921   303.580
  1922   303.950
  1923   304.340
  1924   304.750
  1925   305.180
  1926   305.620
  1927   306.070
  1928   306.535
  1929   307.005
  1930   307.470
  1931   307.930
  1932   308.385
  1933   308.825
  1934   309.230
  1935   309.590
  1936   309.895
  1937   310.130
  1938   310.290
  1939   310.365
  1940   310.370
  1941   310.325
  1942   310.250
  1943   310.175
  1944   310.120
  1945   310.100
  1946   310.130
  1947   310.220
  1948   310.375
  1949   310.600
  1950   310.913
  1951   311.315
  1952   311.787
  1953   312.313
  1954   312.883
  1955   313.495
  1956   314.135
  1957   314.795
  1958   315.474
  1959   316.172
  1960   316.881
  1961   317.600
  1962   318.331
  1963   319.083
  1964   319.865
  1965   320.692
  1966   321.574
  1967   322.517
  1968   323.525
  1969   324.594
  1970   325.716
  1971   326.883
  1972   328.086
  1973   329.311
  1974   330.555
  1975   331.834
  1976   333.163
  1977   334.544
  1978   335.965
  1979   337.415
  1980   338.885
  1981   340.371
  1982   341.880
  1983   343.420
  1984   344.992
  1985   346.601
  1986   348.193
  1987   349.768
  1988   351.335
  1989   352.865
  1990   354.407
  YEAR      CONC
  END OF YEAR CONCS AS GIVEN IN ETHERIDGE ET AL
   AND MERGED WITH IPCC95 DATA SET, MARCH 1996






At 17:35 19/12/96 -0700, you wrote:
>If you want me to check your MAG output, please think about whether I will be
>able to read what you fax me.  The MAG.OUT data you sent me were too small
>(reduced size) for me to read.  Also, as I've said before, please read the
>code.  There is one obvious error you have made --- in the value of ITAUMETH
>in MAGUSER.CFG.  If you read the bottom of this file, it tells you what to
use
>(viz. 3, not 2).  I flagged problems in methane (as used in the IPCC
>calculations) to you in a previous message.
>
>When I run MAG with your wrong ITAUMETH, I still don't get your numbers.  As
>far as I can see, we have different forcings too --- but I can't read your
>output so I can't say this for sure.
>
>Since I get the correct IPCC numbers using your version of MAG.FOR, and since
>(when corrected) we have the same .CFG files, the difference must be in the
>other input details.  Some of these files are attached; plus others to help
>you see what the correct numbers should be.
>
>Cheers,
>Tom
>
>
><<<<<< Attached TEXT file named "ABRKDN.DAT" follows >>>>>>
>Emissions profile: IS95A                                    Date:  9 Sep 1995
>
>
>
-----------------------------------------------------------------------------
Dr Mike Hulme				tel: +44 1603 593162
Climatic Research Unit			fax: +44 1603 507784
School of Environmental Sciences	email:  m.hulme@uea.ac.uk
University of East Anglia		web site: http://www.cru.uea.ac.uk/~mikeh/
Norwich  NR4  7TJ


Mean temps. in C.England during 1996:  about 0.2degC below the 1961-90
average.
The maximum temperature in Norwich:    Wednesday 18 December:  8.1degC.



