Accent Plus Symposium, Urbino, Italy, 17-20 Sep2013 Observations of Enhanced Black Carbon radiative forcing over an Urban Environment A.S.Panicker, G.

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Presentation transcript:

Accent Plus Symposium, Urbino, Italy, Sep2013 Observations of Enhanced Black Carbon radiative forcing over an Urban Environment A.S.Panicker, G. Pandithurai, P.D.Safai, S.Dipu Indian Institute of Tropical Meteorology Pashan, Pune , India

Objectives  To estimate Composite (total) aerosol direct radiative forcing in short wavelength region using chemical composition data  To Estimate direct radiative forcing solely due to Black Carbon (BC)  To find the contribution of BC to total aerosol radiative forcing Accent Plus Symposium, Urbino, Italy, Sep2013

Experimental site

Observations and Models Used for study… Instruments Instruments ► Aethalometer ► High volume sampler ► Sun/Sky radiometer Models ► OPTICAL PROPERTIES OF AEROSOLS AND CLOUDS (OPAC) ► SANTA BARBARA DISCRETE ORDINATE RADIATIVE TRANSFER MODEL (SBDART)

Aethalometer, High Volume sampler, Sun/Skyradimeter AethalometerHigh volume sampler Prede Sun/Skyradiometer

OPAC (Optical Properties of Aerosols and Clouds) ► OPAC Estimates Optical properties of aerosols from µm (AOD,SSA,ASP, Extinction coeff etc.). ► Uses atmospheric chemistry data sets as Input ► Data sets from High volume sampler ( water soluble and acid soluble components) and Aethalometer (Black carbon) MODELS

SBDART (SANTA BARBARA DISCRETE ORDINATE RADIATIVE TRANSFER MODEL) ► 1-dimensional model – Incorporates aerosol observations ► Plane parallel atmosphere ► Line-by-Line integration ► Default Temperature & water vapor profiles: TROPICAL, MID- LATITUDE SUMMER, MID-LATITUDE WINTER, SUB-ARCTIC SUMMER, SUB-ARCTIC WINTER.

SBDART.....  Aerosol Optical Depth  Aerosol Single Scattering Albedo  Asymmetry Parameter  Derived from Observations  Surface Albedo (From MODIS)  Water vapor column (From MODIS)  Column ozone(From TOMS/OMI) Fluxes at different levels (Surface & TOA)  Downward, Upward, and Direct Fluxes

Methodology  Aerosol Short wave radiative forcing estimation for composite aerosols  Water soluble, Acid soluble componets and BC data as inputs in OPAC  OPAC derived Composite aerosol optical properties: AOD, SSA and ASP from μm as inputs in SBDART  Short wave radiative forcing at Surface, TOA and Atmosphere by total aerosol mass  Aerosol Short wave radiative forcing estimation for Black Carbon (BC) aerosols  Black carbon data alone as input in OPAC  OPAC derived BC aerosol AOD, SSA and ASP from μm as inputs in SBDART  Short wave radiative forcing at Surface, TOA and Atmosphere byBC aerosols Aerosol Radiative forcing = Fluxes with aerosols- Fluxes with out aerosols

Comparison of aerosol properties by OPAC and Sky radiometer

Months Mass fraction (μg/m3) Water-Insoluble Water Soluble BC % BC mass to TSP October -04 November-04 January-05 February-05 March-05 April WS/WIS and BC mass

SW radiative forcing by Composite and BC aerosols at surface and TOA

Seasonal averages of shortwave atmospheric forcing for composite and for BC aerosols over Pune

Summary OPAC derived aerosol optical properties for composite aerosols and for BC fraction alone has been incorporated in SBDART to derive composite and BC only aerosol forcing respectively for different seasons The atmospheric forcing derived for composite aerosols were found to be +35.5, +32.9, Wm-2 and for BC fraction alone these were found to be +18.8, and Wm-2 during post-monsoon, winter and pre-monsoon, respectively. The study suggests that eventhogh BC contributes 1.6-5% by mass in total aerosols loading, on an average, it contributes to around 55% of the total atmospheric aerosol radiative forcing due to strong radiative absorption by BC.

Acknowledgements  Prof. Michele Maione, ACCENT plus, W.M.O for supports  Director IITM