Global stratospheric aerosol distribution as measured by the OMPS/LP

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Presentation transcript:

Global stratospheric aerosol distribution as measured by the OMPS/LP Didier Rault, GSFC GESTAR / Morgan State University Pawan Bhartia, NASA Goddard Space Flight Center SSAI processing team, Science Systems & Applications Inc, Lanham, MD 20706, USA OMPS LP Science Team Metting 5 December 2013, SSAI

OUTLINE Stratospheric aerosol product Observations - Brief review of OMPS/LP stratospheric product Aerosol extinction Angstrom coefficient (particle size) - Quality assessment : comparison with CALIPSO, GOMOS files Observations - Chelyabinsk meteor aftermath - Aerosol “bubbles” - Time evolution of aerosol layer (over 1.5 year of operation) - Brewer Dobson Circulation signature - ATAL Future development Aerosol Scattering Ratio (from radiance measurement)

Aerosol curtains Stratospheric aerosol product (1) 3 measurements every 19 s (1° lat sampling) 7000 measurements per day 4-5 days revisit time I km vertical sampling 2 km vertical resolution 2 week Zonal Mean 3

Aerosol Angstrom vertical profile Stratospheric aerosol product (2) Median aerosol layer Median Junge layer. Extinction OMPS at 524 nm (orbit #1055, January 10, 2012) OMPS at 524 nm (orbit #1055, January 10, 2012) Aerosol Angstrom vertical profile (Daily mean) Median Junge layer. Angstrom coefficient NH BDC CALIPSO at 532 nm (averaged over first two weeks in Jan 2012, result by J.-P. Vernier)

Comparison with CALIPSO Comparison with CALIPSO and GOMOS Stratospheric aerosol product (3) Monthly statistics Comparison with CALIPSO Bias < 7%, Variance = 27 % Comparison with GOMOS Bias < 10%, Variance = 30 % 5

Chelyabinsk meteor

Aerosol size (Angstrom) Observation of Chelyabinsk meteor aftermath (1) Descent rate = -1 mm /sec Aerosol scattering ratior Aerosol size (Angstrom)

Aerosol bubbles

Additional features: Aerosol bubbles (1) 10-4.5 Red circle = meteor dust White circle = aerosol bubble OMPS/LP aerosol curtain Height [km] Monthly median Junge layer Event number along orbit 10-4.5

Observation of Aerosol bubbles (2) Meridional velocity at 7hpa (MERRA) Mean speed: 35 deg lat in 32 days = 1.4 m /s Bubble flight time vs latitude

Observation of Aerosol bubbles (3)

Observation of Aerosol bubbles(4)

Time evolution of stratospheric aerosol

Evolution of stratospheric aerosol over OMPS/LP mission (3) February 2012 – August 2013 Fen

Evolution of stratospheric aerosol over OMPS/LP mission (4) February 2012 – August 2013 Fen Annual variation Polewards In NH winter Polewards In SH winter

Evolution of stratospheric aerosol over OMPS/LP mission (5) Annual Variation and QBO? February 2012 – August 2013 Fen

Brewer Dobson circulation (1)

Brewer Dobson circulation (2) Ascent rates compiled by J. Urban

Aerosol particle size (Angstrom) coefficient

Angstrom coefficient (1) Aerosol particle size Angstrom coefficient (1) Feb 2012 – Aug 2013

Brewer Dobson circulation (7)

Angstrom coefficient (3) Aerosol particle size Angstrom coefficient (3) NH BDC Median Junge layer. Extinction Median Junge layer. Angstrom coefficient

Angstrom coefficient (3) Aerosol particle size Angstrom coefficient (3) NH BDC Median Junge layer. Extinction Median Junge layer. Angstrom coefficient Larger particles in NH, finer in SH

Angstrom coefficient (4) Aerosol particle size Angstrom coefficient (4) Median Junge layer. Extinction Median Junge layer. Angstrom coefficient Maximal altitude for R>0.1μm particles: Vterminal = Vupdraft = 0.3mm/sec NH BDC NH BDC

Angstrom coefficient (5) Aerosol particle size Angstrom coefficient (5) Median Junge layer. Extinction Median Junge layer. Angstrom coefficient Maximal altitude for R>0.1μm particles: Vterminal = Vupdraft = 0.2mm/sec NH BDC SH BDC No NH BDC

Asian Tropopause Aerosol Layer [ATAL]

Aerosol Scattering Ratio Future development Aerosol Scattering Ratio (from radiance measurement)

Concept Aerosol Scattering Ratio (1) - ASR = aerosol scattering / Rayleigh scattering - Similar to backscatter ratio for Lidar: Aerosol / Molecular - Can be derived directly from radiance data. (No retrieval, no need for assumption of particle size) - Use 350nm channel as a proxy for Rayleigh ASR ≈ where λ0 = 350 nm and THnorm = High altitude reference I[λ,TH] / I[λ,THnorm] I[λ0,TH] / I[λ0,THnorm]

Aerosol Scattering Ratio (ASR) Evaluated directly from measured radiance (2)

Aerosol Scattering Ratio (ASR) Evaluated directly from measured radiance (3)

Lessons learnt from OMPS/LP stratospheric aerosol assessment: Conclusion Lessons learnt from OMPS/LP stratospheric aerosol assessment: -Quantitative: Within 10% bias, 30% variance wrt CALIPSO, GOMOS -Qualitative: Contains signature of volcano, meteor, BDC (bubbles, extinction profiles, Angstrom). QBO effect TBD(<2 years of data) -Observations: 30% Decrease of stratospheric aerosol from Feb 2012 to Aug 2013 BDC downdraft BDC updraft 35 km 30 km 25 km 20 km 15km Tropopause Surf zone Tropical pipe Vortex Equator Winter pole 1 2 3