Latest update (see below for earlier updates) 24 May 2017:
Cornes et al. (2012a) recovered, quality controlled and homogenized a >300-year daily series of sea-level pressure (SLP) for the city of London (1692-2007). Cornes et al. (2012b) digitized and corrected a number of records to create another very long daily series of SLP for Paris (1670-2007). Both series contain some data gaps, notably 1726-1747 for Paris. Cornes et al. (2012a,b) also assessed the homogeneity of the final series, and data users should refer carefully to these papers when using these data, to take residual concerns into account.
Cornes et al. (2013) used monthly means of the Paris and London SLP series to construct a monthly Paris-London Westerly index from 1692 onwards. This can be used as an estimate of the North Atlantic Oscillation (NAO). See Cornes et al. (2013) for a description of how the Paris-London index is calculated and for a comparison with NAO indices.
When using the Paris-London westerly index, please cite:
|Paris-London Westerly Index|
|paris_london_westerly_index.csv||Monthly and seasonal data, csv format, missing values are "NA"|
|paris_london_westerly_index.xlsx||Monthly and seasonal data, xlsx format (Microsoft Excel spreadsheet), missing values are "NA"|
|Paris and London monthly SLP series|
|paris_monthly.csv||Monthly data, csv format, missing values are "NA", units: hPa (millibars)|
|london_monthly.csv||Monthly data, csv format, missing values are "NA", units: hPa (millibars)|
|Paris and London daily SLP series|
|paris_MSLP_1670_2007.txt||Daily data, plain text format, see README for details of raw and homogenized SLP and quality codes|
|london_MSLP_1692_2007.txt||Daily data, plain text format, see README for details of raw and homogenized SLP and quality codes|