Trends in Aerosol Optical Depth over IndianTrends in Aerosol Optical Depth over Indian region: Potential causes and Impacts

S. Suresh BabuSpace Physics Laboratory

Vikram Sarabhai Space CentreThiruvananthapuram, INDIAp ,s_sureshbabu@vssc.gov.in/

sureshsplvssc@gmail.com

An Integrated Approach

Campaigns

Ground based observationsNetwork observatories

SatelliteSatellite measurements

Models

ARFINET

Soot on Snow/Glaciers

BC near Sathopanth

Aerosol over HimalayasHanle (32.78 N, 78.96 E, 4520 amsl)

Babu et al., J Geophys. Res., 2011

Hanle (32.78 N, 78.96 E, 4520 amsl) vs NCOP(27.95 N, 86.82 E, 5079 amsl)

Evidence of free troposphere warming by absorbing aerosol: Do BC build ‘their own homes’ up in the atmosphere?

Babu et al.,Geophys. Res. Lett., 2011

Evidence of free troposphere warming by absorbing aerosol: Do BC build ‘their own homes’ up in the atmosphere?

Babu et al.,Geophys. Res. Lett., 2011

Elevated aerosol layers & Meridional gradientsElevated aerosol layers & Meridional gradients

O C lOver Central India > 70% of aerosols reside above the clouds during pre-g pmonsoon

D l t d b bi lDo elevated absorbing aerosol layers build their ‘own homes’?If h d th ff tIf so, how do they affect regional climate?

Satheesh et al.,Geophys. Res. Lett., 2008

Regional Aerosol Warming Experiment (RAWEX)(RAWEX)

Integrated Campaign for Aerosols gases and

Radiation Budget ICARBRadiation Budget , ICARB

Moorthy et al., 2009

Spatial Heterogeneity in aerosol properties over

i ioceanic regions

(Moorthy et al.,QJRMS, 2009

Anthropogenic Radiative Forcing

(Nair et al.,J. Geophys.Res., 2010)

Aerosol Radiative Forcing & Efficiency over BoB during Winter

(Babu et al.,J. Geophys.Res., 2012)

(Babu et al.,J. Geophys.Res., 2012)

Do models simulate BC accurately?

(Moorthy et al.,Atmos. Env., 2013)

RegCM Simulations of BC

(Nair et.al., J. Geophys.Res., 2012)

T d i AODTrends in AOD

Multi Wavelength Radiometer

Moorthy et al., 1991; Saha et al., 2004;Babu et al., 2007; Gogoi et al., 2009;

Trend in Regional Mean AOD

Geophys. Res. Lett., 2013

Anthropogenic Influence

Geophys. Res. Lett., 2013

Trend in Stratospheric AOD

0.0001 year-1

0.0002 year-1

0 00007 10.00007 year-1

(Vernier J, P., et al., 2011, GRL)

Thank youThank you