Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques
The present study focuses on analyzing the seasonal changes in aerosol characteristics using a classification scheme proposed by Gobbi et al. (2007). This scheme is based on the correlation between the Ångström exponent (α) in the 440–870 nm range and the difference in α values [<I>d</I...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/30/1393/2012/angeo-30-1393-2012.pdf |
| _version_ | 1829493701715427328 |
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| author | P. R. Sinha D. G. Kaskaoutis R. K. Manchanda S. Sreenivasan |
| author_facet | P. R. Sinha D. G. Kaskaoutis R. K. Manchanda S. Sreenivasan |
| author_sort | P. R. Sinha |
| collection | DOAJ |
| description | The present study focuses on analyzing the seasonal changes in aerosol
characteristics using a classification scheme proposed by Gobbi et al.
(2007). This scheme is based on the correlation between the Ångström
exponent (α) in the 440–870 nm range and the difference in α
values [<I>d</I>α = α (440–675 − α(675–870)] including
the size of fine-mode particles (<I>R</I><sub>f</sub>) and the fine-mode fraction (η). The classification scheme can therefore provide
information on the aerosol characteristics and their modification in
transit. Spectral aerosol measurements using the Microtops-II sun photometer
(MT-II) have systematically been conducted in Hyderabad, India during April
2009–March 2010 and analysed to study the seasonal effects. The results
reveal a seasonal dependence, i.e. the presence of fine-mode aerosols under
turbid atmospheres in winter and post-monsoon, a mixture of fine and coarse
aerosol types in pre-monsoon and a significant influence of marine mixed
with dust air masses during the monsoon season. The identification of the
aerosol source type and the modification processes are discussed along with
clustered air-mass trajectory analysis. Furthermore, we have also checked
the consistency of this scheme with the findings arrived from the columnar
size distributions (CSDs) computed by numerical inversion of spectral AOD
using King's inversion algorithm and the scatter plot between AOD and
spectral α. The comparison clearly demonstrates the usefulness of
the classification scheme and highlights its advantages for the monitoring
and study of seasonal variation of the aerosol types and the modification
processes in the atmosphere. |
| first_indexed | 2024-12-16T06:39:23Z |
| format | Article |
| id | doaj.art-76b85c36d81841bda83b8414f6dbe48f |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-16T06:39:23Z |
| publishDate | 2012-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-76b85c36d81841bda83b8414f6dbe48f2022-12-21T22:40:43ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762012-09-01301393141010.5194/angeo-30-1393-2012Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniquesP. R. Sinha0D. G. Kaskaoutis1R. K. Manchanda2S. Sreenivasan3National Balloon Facility, Tata Institute of Fundamental Research, ECIL Post 5, Hyderabad – 500 062, IndiaResearch and Technology Development Center, Sharda~University, Greater Noida, NCR – 201306, IndiaNational Balloon Facility, Tata Institute of Fundamental Research, ECIL Post 5, Hyderabad – 500 062, IndiaNational Balloon Facility, Tata Institute of Fundamental Research, ECIL Post 5, Hyderabad – 500 062, IndiaThe present study focuses on analyzing the seasonal changes in aerosol characteristics using a classification scheme proposed by Gobbi et al. (2007). This scheme is based on the correlation between the Ångström exponent (α) in the 440–870 nm range and the difference in α values [<I>d</I>α = α (440–675 − α(675–870)] including the size of fine-mode particles (<I>R</I><sub>f</sub>) and the fine-mode fraction (η). The classification scheme can therefore provide information on the aerosol characteristics and their modification in transit. Spectral aerosol measurements using the Microtops-II sun photometer (MT-II) have systematically been conducted in Hyderabad, India during April 2009–March 2010 and analysed to study the seasonal effects. The results reveal a seasonal dependence, i.e. the presence of fine-mode aerosols under turbid atmospheres in winter and post-monsoon, a mixture of fine and coarse aerosol types in pre-monsoon and a significant influence of marine mixed with dust air masses during the monsoon season. The identification of the aerosol source type and the modification processes are discussed along with clustered air-mass trajectory analysis. Furthermore, we have also checked the consistency of this scheme with the findings arrived from the columnar size distributions (CSDs) computed by numerical inversion of spectral AOD using King's inversion algorithm and the scatter plot between AOD and spectral α. The comparison clearly demonstrates the usefulness of the classification scheme and highlights its advantages for the monitoring and study of seasonal variation of the aerosol types and the modification processes in the atmosphere.https://www.ann-geophys.net/30/1393/2012/angeo-30-1393-2012.pdf |
| spellingShingle | P. R. Sinha D. G. Kaskaoutis R. K. Manchanda S. Sreenivasan Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques Annales Geophysicae |
| title | Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques |
| title_full | Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques |
| title_fullStr | Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques |
| title_full_unstemmed | Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques |
| title_short | Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques |
| title_sort | characteristics of aerosols over hyderabad in southern peninsular india synergy in the classification techniques |
| url | https://www.ann-geophys.net/30/1393/2012/angeo-30-1393-2012.pdf |
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