# Presentation: 252252

## Gridded historical MSLP products: existing and future plans

- Tara Ansell
- Hadley Centre, Met Office, UK
- WMO AOPC /OOPC Surface Pressure Working Group
- Met Office, Exeter, October 2005

## New MSLP gridded products : EMSLP

**EMSLP :**** **
-  North Atlantic – Europe **daily** product
-  Blend of **86** stations + marine obs   from **1850-2003**
-  5x5 degree resolution
-  available from www.cru.uea.ac.uk/cru/projects/emulate
-   and www.hadobs.org
-  see Ansell et al, J. Climate (accepted)

## EMSLP problems: 

- Smoothing /damping
- marine gridding system (effects number of observations)
- RSOI
- Greenland
- Variance problems
- RSOI
- Correction to 24 hour
- Daily rather than synoptic fields

## Grid pt vs. station data (daily data)

**Paris**

## Grid point vs Station data (monthly analysis)

**NAO**

## New MSLP gridded products : HadSLP2

**HadSLP2: **
-  Global, **monthly** product (update of HadSLP1)
-  Blend of **1502** stations + marine obs from **1850-2004**
-  5x5 degree resolution
**updated** in near real time with NCEP/NCAR reanalyses
- See **Allan and Ansell, J. Climate (submitted)**

## HadSLP problems: 

- Southern Hemisphere mid-latitudes
- Interpolate or not south of 60oS?
- Required by the user??
- Things to work on:
- Error estimates
- EOFs (Use of NCEP data + obs)

## HadSLP2p coverage

## Northern Hemisphere daily product

**Potential to achieve similar coverage with daily data**

## Digitised European sources to include

- Swiss daily data (not included in EMSLP)
- Requires homogenisation
- UK 3-hourly MSLP observations
- Work in progress (L. Alexander)
- Paris / London?
- Extend beyond 1881

## Dataset index for Northern Hemisphere historical daily MSLP compilation – CDC 100 year Historical Reanalysis

- Name	                           Description	                                   Period of Record

| ICOADS | Global Marine | 1784-2002 |
| --- | --- | --- |
| ICOADS add ons | Kobe, Japanese Whaling, Russian RV | 1889-1940, 1946-1984, 1937-1991 |
| Integrated Surface Hourly | Global Land | 1901-2005 |
| CDMP WBAN 1001 | US Land | 1892-1948 |
| CDMP SAO | US Land | 1928-1948 |
| Russian Empire  | Russian Land | 1849-2000 |
| NCEP/NCAR BUFR | Global UA and Surface | 1948-2005 |
| USSR  | Russian Land (3 hourly) | 1935-1986 |
| WASA | Northern Europe + Greenland | 1871-1996 |
| EMULATE | North Atlantic-Europe | 1850-2004 |
| Environment Canada | Canadian Land | 1842-2005 |
| Hong Kong | Hong Kong Observatory | 1885-1939 |
| Batavia/Jakarta | Royal Dutch Observatory | 1866-1944 |

## Known and/or potential daily MSLP data sources to be tapped – inside and outside of Europe (I)

**China (Beijing, Shanghai, Hong Kong, Macao)**** – ****Nicolas Central Physical Observatory 1850-1912; ****Hong Kong Government Gazette 1861-1941; ****Shanghai, Inspectorate General of Customs, 1877-1905; China Coast Meteorological Register 1885-1912; ****Direccao dos Servicos Meteorologicos e Geofisicos, 1901-2000**
**Caribbean ****– Caribbean Meteorological Institute, ????**
**Greenland ****- Danish Meteorological Institute, 1870s->**
**Middle East, Egypt, Sudan, Mediterranean (eg. Cairo, Alexandria, Beirut, Khartoum, Malta, Trieste, Brindisi, Athens, Limassol)**** –**** ****Abbassia Observatory, 1900-1947; Survey Department, Cairo, 1907-1957; ****Zentralanstalt fur Meteorologie und Geodynamik, Year Books, 1854-1984**

## Known and/or potential daily MSLP data sources to be tapped – inside and outside of Europe (II)

**French Colonial (North Africa, Caribbean, Middle East, SE Asia)**** ****- ****Bureau Central Meteorologique, Bulletin International, 1869-1881; Bureau Central Meteorologique, Annales, 1880-1913 **
**Portuguese Colonial (North Atlantic Islands, Guinea, Goa)**** ****- ****Servico Meteorologico Nacional, Anais meteorologicas das colonias,***** *****1915-1951**
**German Colonial (Labrador, North Africa, Iraq, Iran, Korea)**** - ****Deutsche Seewarte, Deutsche Ueberseeische Meteorologische Beobachtungen*****,***** ****1883-1914**
**Northern Hemisphere**** - ****Washington, Signal Office, 1875-1883**
**Bermuda**** ****–**** ****Bermuda Weather Service, 1981-2000**
**DWR (Daily Weather Reports)**** – UK, French, Spanish, Algerian, Italian, Austro-Hungarian, Russian**

## NH MSLP for March 1881 - International simultaneous meteorological observations, Washington, Signal Office

**Isobars in black**,
**Isotherms in red**