SIMULATED OBSERVATION OF TROPOSPHERIC OZONE AND CO WITH TES

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Presentation transcript:

SIMULATED OBSERVATION OF TROPOSPHERIC OZONE AND CO WITH TES Ming Luo, R. Beer, D.J. Jacob, J.A. Logan, C.D. Rodgers (with thanks to Mark Schoeberl) OBJECTIVES: Optimize TES data collection strategy for 50% duty cycle Assess TES global mapping capability APPROACH: use global 3-D model fields (GEOS-CHEM model) as a synthetic atmosphere

TES OBSERVATIONAL CHARACTERISTICS Sun-synchronous polar orbit, noon-3 p.m. observation Nadir and limb (along-track) views 0.5x5 km nadir pixel size (8x5 km for 16 stacked pixels) 16-day orbit repeat cycle, 233 orbits per cycle (14-15 orbits/day)

TEMPORAL VARIABILITY IN GEOS-CHEM MODEL Time series of surface O3 at Mace Head, Ireland (1996) Observed (Simmonds) Model (Li)

SPATIAL VARIABILITY IN GEOS-CHEM MODEL: forecast vs SPATIAL VARIABILITY IN GEOS-CHEM MODEL: forecast vs. observed CO concentrations in TRACE-P (DC-8 Hong Kong local 1, 7 March 2001) Observed (G.W. Sachse, NASA/LaRC) OBSERVED (Sachse) Lifting ahead of front Boundary layer outflow behind front Cold front GEOS-CHEM forecast (D.J. Jacob, Harvard) GEOS-CHEM (Bey, Liu, Yantosca)

OPTIMIZING THE TES DUTY CYCLE: autocorrelation of global GEOS-CHEM fields for ozone (results for CO are similar) Global autocorrelation coefficient (r2) vs. time lag CONCLUSION: Adopt a 1-day on, 1-day off duty cycle

SAMPLE 500 hPa OZONE FIELD VIEWED BY TES GEOS-CHEM data for Aug. 15, 1994 …sampled on TES orbit track … and filtered for clouds (55% of scenes)

RETRIEVAL OF GEOS-CHEM VERTICAL PROFILES WITH SIMPLIFIED LINEAR ALGORITHM gain Averaging kernel Retrieved profile measurement noise True profile (GEOS-CHEM) a priori Error covariance on a priori Measurement noise covariance Jacobian from TES forward model

GEOS-CHEM for different latitudinal bands Averaging kernels RETRIEVAL ELEMENTS 100 hPa 1000 hPa A priori profiles: yearly means from GEOS-CHEM for different latitudinal bands Averaging kernels

ERRORS ON A PRIORI AND RETRIEVED PROFILES

TES RETRIEVAL OF GEOS-CHEM ATMOSPHERE: 500 hPa ozone on 15 Aug. 1994 Level 2 Level 3 (Gaussian interpolator)

% RETRIEVAL ERROR: 500 hPa ozone on 15 Aug. 1994

OTHER SAMPLE RETRIEVALS Ozone, 800 hPa CO, 700 hPa GEOS-CHEM TES level 3 retrieval