Total Ozone Data Base for COST-726 MCM7: Stockholm, September 11-12, 2006 Janusz Krzyścin Institute of Geophysics Polish Academy of Sciences Warsaw, Poland.

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Presentation transcript:

Total Ozone Data Base for COST-726 MCM7: Stockholm, September 11-12, 2006 Janusz Krzyścin Institute of Geophysics Polish Academy of Sciences Warsaw, Poland

Total Ozone Input Model of reconstruction of daily total ozone Examples of the reconstructed time series Structure of the COST-726 Ozone Data Base

Total Ozone Input National Institute of Water and Atmosphere Research (NIWA), Lauder, New Zeland, Assimilated Total Ozone Data Base (Bodeker et al., 2005) Version 8 Nimbus 7 and Earth Probe TOMS GOME version 3.1 KNMI TOGOMI Version 8 SBUV from NIMBUS 7, NOAA9, NOAA 11, and NOAA 16 satellite Dobson Stations (30°-60°N) Bias < 1% ± 2-3%

Dobson-NIWA Comparison

Total Ozone Reconstruction Two Steps Regression Model 1- Ozone(month)= Regression_A (Indices of Global Atm. Circulation, Monthly Mean Meteo. Variables) 2. Ozone (day) - Ozone(month) = Regresion_B( Daily Meteo Variables– Monthly Mean Meteo Variables) Training period : Ozone(month), Ozone(day) from NIWA Data Base Model Total Ozone since beginning of proxy data ! Model Ozone = Regression_A + Regression_B

Dobson-NIWA Comparison

Dobson- Reconstructed Ozone Comparison

* Model Skill * X(Model)= (Dobson-Model)/Model Skill Coeff(Model) = Var (X(Simple))/Var(X(Model )) SKILL COEFFICIENT t<1979 (EARLY DOBSON) COST ERA-40 S E A S O N AROSA OXFORD LERWICK UPPSALA SIMPLE MODEL

General Comments Performance of the COST model (warm period) for t <1979 long-term bias ± 2%, standard dev. 3%-7% (larger standard errors probably due to uncertainties of the Dobson measurements in cloudy conditions, see Lerwick) COST reconstructed ozone almost equivalent ERA-40 Ozone usually bias smaller for COST but smaller standard dev for ERA-40 COST and ERA-40 model better than simplified model using constant daily ozone values derived from NIWA data COST model = quality control tool for the Dobson ozone

COST-726 Total Ozone Data Base Area and Resolution (30°-70°N, 15°W-30°E) - area as defined by MCM6 (1°.0 (latitude)×1°.25(longitude) – as in NIWA Base) Start and End date: Jan Dec 1978 : COST model Jan Dec 2004 : NIWA + COST/ERA (if no NIWA) Jan Dec ???? : OMI on AURA spacecraft Time Table to be completed before next MCM Meeting (December 2006)