Presentation is loading. Please wait.

Presentation is loading. Please wait.

Satellite Observations of Enhanced Pre- Monsoon Aerosol Loading and Tropospheric Warming over the Gangetic-Himalayan Region Ritesh Gautam 1, N. Christina.

Published byRicardo Ingham Modified over 9 years ago

Similar presentations

Presentation on theme: "Satellite Observations of Enhanced Pre- Monsoon Aerosol Loading and Tropospheric Warming over the Gangetic-Himalayan Region Ritesh Gautam 1, N. Christina."— Presentation transcript:

1 Satellite Observations of Enhanced Pre- Monsoon Aerosol Loading and Tropospheric Warming over the Gangetic-Himalayan Region Ritesh Gautam 1, N. Christina Hsu 2, W. Lau 2 1 GEST/University of Maryland Baltimore County 2 NASA Goddard Space Flight Center Biomass Burning Dust Anthropogenic Pollution Gangetic Plains

2 Motivation In recent past years, model studies have suggested the importance of aerosol solar absorption in modulating the monsoon rainfall distribution (for e.g., Menon et al., 2002; Ramanathan et al., 2005; Lau et al., 2006; Meehl et al., 2008; Randles and Ramaswamy, 2008). Pre-monsoon period marks the reversal of tropospheric temp. gradient and is crucial to the summer monsoon onset and rainfall. Dust mixed with soot over northern India has been hypothesized in intensifying the early summer monsoon circulation and rainfall (Lau et al., 2006, Lau and Kim, 2006). MODIS, 9 June 2003  Climate modeling can benefit from an indepth characterization of spatio-temporal- vertical characterization of the regional aerosol loading and associated radiative impacts.

3 Strong seasonal variations of Aerosols over the IGP Pre-monsoon AOD Climatology 2003-2009 (Aqua MODIS Dark Target w/Deep Blue) Kanpur/AERONET

4 Altitude (km) CALIOP cloud-screened mean backscatter profile for April-May 2008 Vertically extended aerosols over northern India, aerosol layer top ~ 5 km CALIOP Over 70% of mean AOD in northern India associated with higher depolarization ratio suggesting greater contribution of non-spherical particulates Pre-monsoon Aerosol Characterization from CALIPSO Gautam, Liu, Singh, Hsu, GRL (2009)

5  Model calculated column SSA (@550nm) in the IGP over Kanpur is 0.89±0.01 during pre-monsoon period.  Diurnally averaged surface forcing efficiency: - 70Wm -2 and mean forcing value (-44Wm -2 ) ranges from -11 to -79.8Wm -2. Aerosol Solar Absorption and Radiative Forcing

6 Enhanced Tropospheric Warming during Pre-Monsoon Season 1979-2007MayMarch-April-May Strengthened land-sea thermal gradient Microwave Sounding Unit (MSU) data, corrected for stratospheric cooling influence - Fu et al., 2004 (Nature) Gautam, Hsu, Lau, Tsay, Kafatos, Geophys. Res. Lett. (2009)

7 Annual Mean Trend (1979-2007)

8 After correcting for stratospheric cooling influence (Fu et al., 2004) Directly from RSS data Trends for Annual Mean and May Tropospheric Temperature (1979-2007) over the Himalayas  Aerosol solar absorption effects/EHP mechanism, in addition to global warming, could potentially be amplifying the enhanced western Himalayan warming.  The western Himalayan warming significantly exceeds other surrounding elevated regions of the Himalayas and Tibetan Plateau. *Trends in °C/year; RSS (Remote Sensing Systems) data portal Gautam, Hsu, Lau, JGR (in press)

9 Summary Progressive buildup of aerosol loading over the Gangetic region from April through June (pre-monsoon) observed from MODIS, with enhanced dust loading indicated by CALIOP-derived depolarization ratios and AERONET retrievals of optical properties. Vertically extended aerosols upto 5km with enhanced aerosol solar absorption (SSA: 0.89) and large impact on regional radiation budget (surface forcing efficiency: -70Wm -2 and mean forcing value ranges from -11 to -79.8Wm -2 ). Tropospheric temperatures observed from MSU (1979-2007) indicate accelerated warming over western Himalayas (0.19-0.26°C/decade), most pronounced in the pre-monsoon period, suggesting the plausible role of absorbing aerosols in amplifying the observed warming trend. Acknowledgements: satellite data production teams (MODIS, CALIPSO, MSU) and AERONET.

Download ppt "Satellite Observations of Enhanced Pre- Monsoon Aerosol Loading and Tropospheric Warming over the Gangetic-Himalayan Region Ritesh Gautam 1, N. Christina."

Similar presentations

Boundary Layer Clouds & Sea Spray Steve Siems, Yi (Vivian) Huang, Luke Hande, Mike Manton & Thom Chubb.

Boundary Layer Clouds & Sea Spray Steve Siems, Yi (Vivian) Huang, Luke Hande, Mike Manton & Thom Chubb.
Global, Regional, and Urban Climate Effects of Air Pollutants Mark Z. Jacobson Dept. of Civil & Environmental Engineering Stanford University.

Global, Regional, and Urban Climate Effects of Air Pollutants Mark Z. Jacobson Dept. of Civil & Environmental Engineering Stanford University.
1 Effects of solar activity, co-rotating interaction regions, and climate change on thermospheric density during the solar cycle 23/24 minimum Stan Solomon.

1 Effects of solar activity, co-rotating interaction regions, and climate change on thermospheric density during the solar cycle 23/24 minimum Stan Solomon.
Enhanced surface warming and accelerated snow melt in the Himalayas and Tibetan Plateau induced by absorbing aerosols William K-M Lau (NASA/GSFC) Kyu-Myong.

Enhanced surface warming and accelerated snow melt in the Himalayas and Tibetan Plateau induced by absorbing aerosols William K-M Lau (NASA/GSFC) Kyu-Myong.
Warm Indian Ocean Weak Asian Monsoon

Warm Indian Ocean Weak Asian Monsoon
Applications of satellite measurements on dust-cloud-precipitation interactions over Asia arid/semi-arid region Jianping Huang Key Laboratory for Semi-Arid.

Applications of satellite measurements on dust-cloud-precipitation interactions over Asia arid/semi-arid region Jianping Huang Key Laboratory for Semi-Arid.
Geophysical Fluid Dynamics Laboratory Review June 30 - July 2, 2009 Geophysical Fluid Dynamics Laboratory Review June 30 - July 2, 2009.

Geophysical Fluid Dynamics Laboratory Review June 30 - July 2, 2009 Geophysical Fluid Dynamics Laboratory Review June 30 - July 2, 2009.
MET 12 Global Climate Change – Lecture 8

MET 12 Global Climate Change – Lecture 8
The Role of Aerosols in Climate Change Eleanor J. Highwood Department of Meteorology, With thanks to all the IPCC scientists, Keith Shine (Reading) and.

The Role of Aerosols in Climate Change Eleanor J. Highwood Department of Meteorology, With thanks to all the IPCC scientists, Keith Shine (Reading) and.
Satellite Remote Sensing of Surface Air Quality

Satellite Remote Sensing of Surface Air Quality
Radiation’s Role in Anthropogenic Climate Change AOS 340.

Radiation’s Role in Anthropogenic Climate Change AOS 340.
1 Impact of Air Pollution on the South Asian Monsoon A Paper Review Siv Balachandran 04/26/07.

1 Impact of Air Pollution on the South Asian Monsoon A Paper Review Siv Balachandran 04/26/07.
ANTHROPOGENIC AND VOLCANIC CONTRIBUTIONS TO THE DECADAL VARIATIONS OF STRATOSPHERIC AEROSOL Mian Chin, NASA Goddard Space Flight Center Plus: Thomas Diehl,

ANTHROPOGENIC AND VOLCANIC CONTRIBUTIONS TO THE DECADAL VARIATIONS OF STRATOSPHERIC AEROSOL Mian Chin, NASA Goddard Space Flight Center Plus: Thomas Diehl,
1 Satellite Remote Sensing of Particulate Matter Air Quality ARSET Applied Remote Sensing Education and Training A project of NASA Applied Sciences Pawan.

1 Satellite Remote Sensing of Particulate Matter Air Quality ARSET Applied Remote Sensing Education and Training A project of NASA Applied Sciences Pawan.
Direct Radiative Effect of aerosols over clouds and clear skies determined using CALIPSO and the A-Train Robert Wood with Duli Chand, Tad Anderson, Bob.

Direct Radiative Effect of aerosols over clouds and clear skies determined using CALIPSO and the A-Train Robert Wood with Duli Chand, Tad Anderson, Bob.
Dust Detection in MODIS Image Spectral Thresholds based on Zhao et al., 2010 Pawan Gupta NASA Goddard Space Flight Center GEST/University of Maryland Baltimore.

Dust Detection in MODIS Image Spectral Thresholds based on Zhao et al., 2010 Pawan Gupta NASA Goddard Space Flight Center GEST/University of Maryland Baltimore.
Direct aerosol radiative forcing based on combined A-Train observations – challenges in deriving all-sky estimates Jens Redemann, Y. Shinozuka, M.Kacenelenbogen,

Direct aerosol radiative forcing based on combined A-Train observations – challenges in deriving all-sky estimates Jens Redemann, Y. Shinozuka, M.Kacenelenbogen,
AQUA AURA The Berkeley High Spatial Resolution(BEHR) OMI NO2 Retrieval: Recent Trends in NO2 Ronald C. Cohen University of California, Berkeley $$ NASA.

AQUA AURA The Berkeley High Spatial Resolution(BEHR) OMI NO2 Retrieval: Recent Trends in NO2 Ronald C. Cohen University of California, Berkeley $$ NASA.
Black Carbon in Snow: Treatment and Results Mark Flanner 1 Charlie Zender 2 Jim Randerson 2 Phil Rasch 1 1 NCAR 2 University of California at Irvine.

Black Carbon in Snow: Treatment and Results Mark Flanner 1 Charlie Zender 2 Jim Randerson 2 Phil Rasch 1 1 NCAR 2 University of California at Irvine.
Application of Satellite Data to Particulate, Smoke and Dust Monitoring Spring 2015 ARSET - AQ Applied Remote Sensing Education and Training – Air Quality.

Application of Satellite Data to Particulate, Smoke and Dust Monitoring Spring 2015 ARSET - AQ Applied Remote Sensing Education and Training – Air Quality.

Similar presentations

Ads by Google