Various version of GISS Reykjavik temperatures I have collected over the years.
Data.GISS: GISS Surface Temperature Analysis
Data.GISS: GISS Surface Temperature Analysis
Data.GISS: GISS Surface Temperature Analysis (v4)
The person in charge at the Icelandic Met Office said in 2012 : The GHCN “corrections” are grossly in error in the case of Reykjavik.
From: Trausti Jónsson
To: paul homewood
Cc: Halldór Björnsson
Sent: Monday, 23 January 2012, 17:40
Subject: Re: monthly temperatures
Hi Paul.We have sent a questions to the GHCN database regarding this and they will look into the problem. Regarding your questions:
a) Were the Iceland Met Office aware that these adjustments are being made?No we were not aware of this.
b) Has the Met Office been advised of the reasons for them?No, but we are asking for the reasons
c) Does the Met Office accept that their own temperature data is in error, and that the corrections applied byGHCN are both valid and of the correct value? If so, why?
The GHCN “corrections” are grossly in error in the case of Reykjavik but not quite as bad for the other stations. But we will have a better look. We do not accept these “corrections”.
d) Does the Met Office intend to modify their own temperature records in line with GHCN?No.
No changes have been made in the Stykkisholmur series since about 1970, the Reykjavík and Akureyri series that I sent you have been slightly adjusted for major relocations and changes in observing hours. Because of the observing hour changes, values that where published before 1924 in Reykjavík and before 1928 in Akureyri are not compatible with the later calculation practices. For other stations in Iceland values published before 1956 are incompatible with later values except at stations that observed 8 times per day (but the differences are usually small). The linked paper outlines these problems (in English):
http://www.vedur.is/media/vedurstofan/utgafa/greinargerdir/1995/Climatological1960.pdf
The monthly publication Vedrattan 1924 to 1997 (in Icelandic) is available at:
http://timarit.is/view_page_init.jsp?pubId=278&lang=is&navsel=666
and earlier data (in Icelandic and Danish – with a summary in French) at:
http://timarit.is/view_page_init.jsp?pubId=240&lang=is&navsel=666
http://timarit.is/view_page_init.jsp?pubId=241&lang=is&navsel=666
Monthly data from all stations from 1961 onwards :
http://www.vedur.is/Medaltalstoflur-txt/Manadargildi.html
Best wishes,
Trausti J.
