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Rob Allan - Met Office Hadley Centre for Climate Prediction and Research (co-convenor)
Tara Ansell - Met Office Hadley Centre for Climate Prediction and Research
Theo Brandsma - KNMI
Manola Brunet - Climate Change Research Group, University Rovira i Virgili
Michele Brunetti - ISAC, CNR
Gil Compo - NOAA Earth System Research Lab (co-convenor)
Joe Elms - NOAA NCDC
Malcolm Haylock - CRU, UEA
Julie Jones - GKSS Research Centre
Phil Jones - CRU, UEA
Masao Kanamitsu - Scripps Institute of Oceanography
Alexey Kaplan - Lamont-Doherty Earth Observatory of Columbia University
Maurizio Maugeri - Istituto di Fisica Generale Applicata, Milan University
Shawn Smith - Center for Ocean-Atmosphere Prediction Studies, Florida State Univ
Ag Stephens - British Atmospheric Data Centre (and also Met Office)
Val Swail - Environment Canada
Bridget Thomas - Environment Canada
Dennis Wheeler - University of Sunderland
Clive Wilkinson - NOAA (currently at CRU, UEA)
Kate Willett - CRU, UEA, and also Met Office Hadley Centre for Climate Prediction and Research
Scott Woodruff - NOAA Earth System Research Lab
Philip Woodworth - Proudman Oceanographic Laboratory
Masumi Zaiki - Kobe University (currently at CRU, UEA)
Xukai Zou - National Climate Center, China Meteorological Administration (currently at Met Office Hadley Centre for Climate Prediction and Research)
Rob Allan opened the meeting by thanking all those for attending. Discussion then centred around nine main themes:
- The GCOS AOPC/OOPC Surface pressure working group WWW site (http://www.esrl.noaa.gov/psd/Pressure/)
- International Surface pressure data bank
- Data archaeology, digitisation
- Gridded historical MSLP products
- Historical Reanalysis
- Extension and reconstruction of long MSLP series and indices
- Discussion of inclusion of winds in our remit
- Some recent analyses using MSLP data
- Work plan
Gil Compo provided a tour of the new web site, requesting feedback from all present. The issues of whether to provide software on the site was discussed and it was agreed that providing some sample code (e.g. snippet of Fortran) would help prevent mis-understandings. Phil Jones noted that the start date for the Azores series was wrong (should be 1865).
Other issues included whether the site is OPeNDAP (Open-source Project for a Network Data Access Protocol)/ DODS (Distributed Oceanographic Data System) compatible (it is). Shawn Smith suggested that to get around the issue of not being able to readily click back to the main page, we could have a separate pop up of the page.
It was also decided that it would be important to pursue a GCOS proposal to maintain the web site.
Daily fields at this stage have not yet been included on the website.
Gil Compo introduced the concept of ISPD, whose main aim is to include every single pressure observation for as far back in time as possible in the data bank (from sub-daily to monthly and from land and ocean). The goal is traceability. Two main issues were discussed: the data format and regional co-ordinators to help further ISPD.
There were 7 presentations given in this section, 5 of which are available from the AOPC web page. General comments are described below; a list of all presentations and Q&A (not noted here in the general comments) are provided in section 5.
Gil Compo raised the issue of the missing sources that went into creating the '1899' hand drawn North Hemisphere synoptic charts: There is a table of sources used to create this map (handed out) and all these sources were originally in the NOAA library, but now they have been lost. Gil Compo/ Rob Allan asked for regional co-coordinators to help find these records.
Maurizio Maugeri said a complete inventory is needed of Jesuit records (see Manola Brunet's presentation). Rob Allan suggested that the work already undertaken by Agust'n Ud'as may be a good start (see references).
Alexey Kaplan is happy to pass on his Optical Character Recognition (OCR) software to those interested. He reported good success using printed monthly data from Russian volumes (see presentation).
Environment Canada has a number of digitization priorities, however they are open to proposals for the digitisation of any specific stations, periods or regions of interest - please let Val Swail know.
General recommendation: if we are going to digitise, then please digitize all variables
There were two presentations on gridded MSLP products by Tara Ansell and Alexey Kaplan, both of which are available on the AOPC web site. The main issues included the use of wind data in improving the analysis (Kaplan) and the Hadley Centre's plans to develop a sub-daily MSLP dataset over the Northern Hemisphere (Ansell).
Both were seen as important developments and work to pursue by the group.
Two presentations were given on this issue: one by Masao Kanamitsu on the role of pressure and SST observations in reanalysis and the other by Gil Compo on the feasibility of an historical reanalysis without soundings (both presentations are available). Gil Compo stressed the importance of getting all available sub-daily pressure observations. Even if it is not included in time for the reanalysis, it will still be important for validation.
There were 4 presentations given in this section (3 of which are available from the AOPC web page). General comments are described below; a list of all presentations and Q&A (not noted here in the general comments) are provided in section 5.
A large amount of daily SLP data has been collated at KNMI as part of the EC funded ENSEMBLES project (Brandsma presentation). Not all is freely available and so the Group decided to formally ask for the data. Plans to digitise the KNMI log books were raised by Rob Allan: the Dutch data have all been digitised (and freely available from KNMI site). The colonial data, however, have not yet been digitised.
Historical monthly Japanese data from the 19th Century has recently been recovered in KNMI log books and digitised (Masumi presentation). Sub-daily data is available in the 1870s, but not yet digitised.
Philip Woodworth stressed the importance of SLP gridded analyses for tide gauge and satellite altimeter sea level work. Both monthly and daily data is needed for studies of long time series, in addition to the higher frequency products available from the analysis projects for the study of more recent sea level data. He mentioned that Doug Luther's involvement with the Group probably originated from Luther's interest in processes such as 5 day waves in the atmosphere and ocean, and that in Doug's absence he had been happy to represent the sea level community at this meeting.
There were two presentations given on this issue: one by Julie Jones and the other by Malcolm Haylock (both are available). Julie's talk on AAO reconstructions, using HadSLP2, highlighted a number of problems with HadSLP2 in the high southern latitudes that will be looked into by Tara Ansell and Rob Allan.
Issues raised in General discussion were:
Theme 2: International Surface pressure data bank.
Gil Compo: 'International Surface Pressure Data Bank' (presentation available)
Rob Allan: 'International Pressure Data Bank' (presentation available)
Theme 3: data archaeology and digitization.
Val Swail said that Xiaolan Wang (Environment Canada) has found some Moravian data and that it appears to be in German museums. Dennis Wheeler said that Jim Fleming from the University of Maine would have more information and that a good contact in Germany would be Connie Luedecke at: email@example.com
Theme 4: gridded historical MSLP products.
Tara Ansell: 'Gridded historical MSLP products: existing and future plans' (presentation available)
Alexey Kaplan: 'Gridded Historical MSLP products' (presentation available)
Theme 5: historical reanalysis.
Masao Kanamitsu: 'The role of pressure and SST observations in reanalysis'
Gil Compo: 'The feasibility of a Reanalysis without soundings'
Details of the fields produced and what will be available: There will be the same fields as NCEP/NCAR and 13 key fields for the 100 members. An ensemble mean and ensemble spread will also be given. NCEP and NCAR have both offered to host an archive.
Theme 6: extension and reconstruction of long MSLP series and indices.
Theo Brandsma: 'Current research on historical air-pressures at KNMI (the Netherlands)' (presentation available)
Masumi Zaiki: 'The 19th century pressure data in Japan' (presentation available)
Rob Allan: 'Extension and reconstruction of long MSLP series and indices' (presentation available)
Philip Woodworth: 'MSLP data requirements for Tide gauge corrections' (no OHPs)
Theme 8: Some recent analyses using MSLP data.
Julie Jones: 'Instrumental AAOI reconstructions and comparison with the HadSLP1/2 AAOIs and pattern nudging for assimilation of instrumental/proxy data' (presentation available)
Malcolm Haylock: 'Interdecadal changes in 1870-2003 Northern Hemisphere winter sea level pressure variability and relationship with temperature' (presentation available)
Udias, A. (2003) 'Searching the heavens and the Earth: the history of Jesuit observatories', Dordrecht, Kluwer Academic Publishers.[an error occurred while processing this directive]