A Discussion on TEMPO Draft CH2O Validation Plan

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Presentation transcript:

A Discussion on TEMPO Draft CH2O Validation Plan Jim Szykman, Jay Herman, & all interested in CH2O May 27-28, 2015 3rd TEMPO Science Team Meeting UAH-NSSTC Huntsville, AL

Proposed Approach for validation (presented at 1st STM) Validation conducted from commissioning till end of Phase E (end of operations) Mission duration, subject to instrument availability Baseline 20 months Threshold 12 months Level Product Definition Approach Raw instr. Sci. and HK data Quality flags for duplicates, missing files, checksums 1b Level 1 geo-located, calibrated spectral radiances Comparisons with measured and modeled radiances based on coincident column measurements 2 Retrieved gas columns and profiles, aerosol, clouds, UVB Comparisons with ground-based, balloon-borne, sub-orbital, and satellite remote-sensed products 2 NRT Retrieved gas, aerosols, clouds, UVB Comparison with L2 normal delivery products 3† Gridded monthly means of L2 data Comp. with correlative measurements and climatologies

(Selected Scenes) Baseline only PLRA 4.1.1 and 4.1.2 Baseline and threshold data products Species/Products Required Precision Temporal Revisit 0-2 km O3 (Selected Scenes) Baseline only 10 ppbv 2 hour Tropospheric O3 1 hour Total O3 3% Tropospheric NO2 1.0 × 1015 molecules cm-2 Tropospheric H2CO 1.0 × 1016 molecules cm-2 3 hour Tropospheric SO2 Tropospheric C2H2O2 4.0 × 1014 molecules cm-2 Aerosol Optical Depth 0.10 PLRA Table 1 Across Greater North America (GNA): 19°N to 57.5°N near 100°W, 67°W to 125°W near 42°N Data products at urban-regional spatial scales Baseline ≤ 60 km2 at center of Field Of Regard (FOR) Threshold ≤ 300 km2 at center of FOR Temporal scales to resolve diurnal changes in pollutant distributions Collected in cloud-free scenes Geolocation uncertainty of less than 4 km 11/29/2018

Validation Challenges Validation challenges for TEMPO CH2O column measurements: Adequacy (or lack) of correlative measurements - vertical distribution (especially within the BL) Impact a priori vertical diurnal profiles Aerosols and clouds Albedo changes and spatial gradients Sources of independent sources of CH2O measurements: Satellite data sets from independent sensors: TropOMI Aircraft observations; GCAS, GeoTASO, Aircarft in-situ profiles Ground-based measurements; Pandora For CH2O a-priori vertical profile shapes have the largest systematic impact on the satellite column errors due to the strong decrease of the satellite UV measurement sensitivity near the surface.

DISCOVER-AQ P-3 Median CH2O Profiles 5

Daily CH2O P-3 Spirals (Profiles) DISCOVER-AQ Baltimore, MD July 2011