Dr. Mannil Mohan Profile

Dr. Mannil Mohan

at Vikram Sarabhai Space Ctr

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 3 May 2016 Paper

Genesis of elevated aerosol loading over the Indian region

S. S. Prijith, P. V. N. Rao, Mannil Mohan

Proceedings Volume 9882, 988208 (2016) https://doi.org/10.1117/12.2223480

KEYWORDS: Aerosols, MODIS, Minerals, Convection, Atmospheric particles, Earth observing sensors, Earth's atmosphere, Solar radiation

Read Abstract +

Elevated aerosols assume importance as the diabatic heating due to aerosol absorption is more intense at higher altitudes where the atmosphere becomes thinner. Indian region, especially its central and northern latitudes, experiences significant loading of elevated aerosols during pre-monsoon and summer months. Genesis of elevated aerosol loading over Indian region is investigated in the present study, using multi-year satellite observations from Cloud Aerosol Lidar with Orthogonal Polarization (CALIOP) and Moderate Resolution Imaging Spectroradiometer (MODIS) along with reanalysis winds from MERRA. Central India is observed to have prominent aerosols loading at higher altitudes during pre-monsoon season, whereas it is during summer months over north-west India. Further analysis reveals that the elevated aerosols over Indian region in pre-monsoon and summer months are significantly contributed by transported mineral dust from the arid continental regions at west. In addition to the mineral dust advection, aerosols at higher altitudes over Indian region are enriched by strong convection and associated vertical transport of surface level aerosols. Vertical transport of aerosols observed over Indian region during pre-monsoon and summer months is aided by intense convergence at the surface level and divergence at the upper level. Moreover, aerosol source/sink strength estimated using aerosol flux continuity equation show significant aerosol production over central India during pre-monsoon. Strong vertical transport prevails during pre-monsoon uplifts the locally produced aerosols, with considerable anthropogenic fraction, to higher altitudes where their impacts would be more intense.

Proceedings Article | 8 December 2006 Paper

Aerosol optical depth modulations by lower tropospheric meteorological fields

Marina Aloysius, M. Mohan, K. Parameswaran

Proceedings Volume 6408, 640815 (2006) https://doi.org/10.1117/12.694082

KEYWORDS: Aerosols, MODIS, Meteorology, Ocean optics, Atmospheric particles, Modulation, Satellites, Minerals, Clouds, Aluminum

Read Abstract +

The role of local production and transport in governing the spatial distribution of aerosol loading over the Indian subcontinent and adjoining oceanic regions are examined using satellite derived aerosol optical depth (AOD) and wind speed obtained from National Centre for Environmental Prediction (NCEP) reanalysis for the year 2004 (study domain: 20S°-40°N, 40°-120°N). The association of AOD with wind speed, wind convergence, vorticity and vertical velocity are examined for the Arabian Sea, Bay of Bengal, equatorial Indian Ocean as well as over the land surface in central India for different seasons. This analysis shows that the AOD dependence on these dynamical variables are significantly different for different seasons. Introducing MODIS derived AOD and the NCEP winds into an aerosol flux continuity equation, the locations of aerosol generation are identified and their strengths estimated for different months.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years