International Journal of Current Research and Review
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IJCRR - 4(10), May, 2012

Pages: 87-95

Date of Publication: 25-May-2012


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SEASONAL VARIATIONS OF AEROSOL OPTICAL DEPTH OVER INDIAN SUBCONTINENT

Author: T. Kiran Kumar, S. Vijay Bhaskar Rao

Category: General Sciences

Abstract:Atmospheric aerosols are considered to be one of most complex and important parameter affecting the climate change. According to IPCC Scientific understanding of Atmospheric Aerosol forcing on climate change is very low. Estimating the impact of Atmospheric Aerosols on climate is very complex as they
differ in chemical composition and optical properties viz. Scattering and absorbing. Precipitation
phenomena is influenced by aerosols hence study of atmospheric aerosols over Indian sub continent is
necessary as the Indian economy is highly dependent on Monsoon rainfall. AOD (Aerosol Optical Depth)
from MODIS (MODerate Resolution Imaging Spectroradiometer) onboard Terra and Aerosol Index (AI)
from OMI (Ozone Monitoring Instrument) onboard Aqua to study the seasonal variation of Aerosols. Study of Aerosols during Monsoon is highlighted to investigate their behaviour during this season. Aerosol loading is found to be more in the study region during Monsoon(June, July, August, September) and less in Post monsoon (October, November). Effect of Topography on Aerosol loading is observed and Aerosol loading is less over elevated regions. The COV (Coefficient of Variation of AOD is high over elevated regions showing high variability. High Aerosol Index over Arabian Sea and western India, and wind direction during monsoon indicates high aerosol loading transported through westerlies. This also supports the statement that the high values of AOD is not due to cloud contamination but due to presence of high amount of Aerosols and most of them are found to be transported from Arabian desert and Africa through Arabian sea.

Full Text:

INTRODUCTION
The Indian sub continent comprises of a wide range of weather across a large geographic scale and varied topography. India has extraordinary variety of climatic regions, viz. tropical wet and tropical dry in the south, semiarid in the central part of southern peninsular India, arid and semi arid regions in the west, temperate and cold winter climate near the Himalayas (Lohmann et al, 1993).

The region's climate is strongly influenced by the Himalayas and the Thar Desert. The Indo Gangetic plain is the most densely populated region. The river Ganges is a perennial river, owing to this lot of polluting industries are established near by the river. Most of the thermal power stations are situated in this region due to the availability of water throughout the year (http://www.cpcb.nic.in , 2012). The North western part of India is also affected by dust plumes due to the presence of Great Indian Desert in Rajasthan and this dust is transported with wind to northern part of India. 

Southern peninsular India is comparatively less polluted and the reason may be transport from and towards the water bodies surrounding it (Niranjan et al, 2008). The air quality is highly affected by the emission from the transportation vehicles, Industries and household cooking hence observations of atmospheric aerosols throughout the subcontinent are necessary. As the present ground based observation sites are limited, Satellite observations has to be used for studying the whole region. Seasonal variation of Atmospheric aerosols over India is taken up in this study using MODIS aboard Terra and OMI aboard Aura satellites. The economy of India depends heavily on agriculture and agriculture depends mainly on the monsoon rainfall which occurs in the period between June and September. Atmospheric aerosols over a region can affect precipitation [Ramanathan et al., 2001], and thus aerosol research is very important in the Indian context. Many groups are actively involved in the aerosol research in India with ground based as well as satellite observations. A review of aerosol measurements in India was described by Dey and Girolamo, (2010). Efforts have been put by different groups in India to measure Physical, Chemical and optical properties of atmospheric aerosols. We studied seasonal variation of aerosols over India using MODIS AOD and Aerosol Index from Ozone Monitoring Instrument. MODIS AOD is used for study of Aerosol loading over the region whereas Aerosol Index is used to study the absorbing aerosols.

DATA AND METHODOLOGY
The region, within 40° N and 5° N and 65°E and 99°E is selected for the study and it is subdivided into 7225 grids each of size 0.4° × 0.4°. Level 2 of Collection 5 MODIS aboard Terra AOD data for a period of Five years (2005-2010) has been used for this study (MODIS Website 2012).

The resolution of the actual data is 0.1° × 0.1° (approximately 10Km) at nadir (Satvencho et al 2004). The quality of MODIS AOD has been well documented by Levy et al. (2007), (2010) and Remer et al. (2005). The data has been separated for each season namely Summer (March, April and May), Monsoon (June, July, August and September), Post monsoon (October and November) and winter (December, January and February). AOD over each grid is averaged to represent the aerosol loading over the study region during that season. A statistical parameter 'Coefficient of variation (COV) is used to analyse the temporal variability of aerosol optical depth. COV is a ratio of standard deviation to the mean of the data set. COV normalizes the standard deviation and makes them comparable across the region.

COV of AOD is proportional to its variability over the region. NCEP/NCAR Reanalysis data has been used to investigate the Relative Humidity and wind pattern over the study region. Relative humidity influences the size as well as life time of Aerosols and wind influences the amount of Aerosols through transportation.

Aerosol Index (AI) from Ozone Monitoring Instrument aboard Aura satellite has been used to study the absorbing aerosols over the study region. OMI Aerosol index Level 2 data has been used for the study. The resolution of the data is 0.25° × 0.25°.Values of Aerosol Index greater than 0.5 indicates presence of absorbing aerosols. Negative values indicate non absorbing aerosols or clouds. Our objective in using AI data is to study absorbing aerosols. As Aerosol Index is retrieved in UV region, Absorbing aerosols can be detected even in the presence of clouds, snow and ice. In fact the retrieval will be more effective in presence of clouds (Torres et al, 2007, Manoj et al, 2010).

OBSERVATIONS AND RESULTS
Climatology of Wind over the study region:
The 10 year (2001-2010) monthly mean Humidity and vector wind data from NCEP/NCAR reanalysis data available at a resolution 2.5 º x 2.5 º has been used in this present study to assess the aerosol loading in Indian region. The wind vectors over the study region for each month are plotted with humidity as background. During winter season (DJF) the winds are North easterlies and humidity is less over the central part of India, continuing up to the April month. During May and June the summer monsoon arrives with persistent south westerly?s, which bring a lot of moisture to the Indian subcontinent, resulting in high humidity (i.e., 90%) over south peninsular and central part of India. This continues up to the end of September. It is well known that the meridional circulation over the Indian region reverses direction from summer to winter. As the south west monsoon retreats from the Indian region, the north easterlies prevail over south peninsular India with the commencing of North east monsoon. During the month of October it is clearly noticed that the south westerly?s are slowly turned in to north easterlies prevailed over the southern peninsular India, and persists up to the month of December. In the month of October, high humidity is confined to southern peninsular i.e.70%, and slowly decreases as the NE monsoon recedes, which indicates fair weather.

Seasonal variation of Aerosol Optical Depth over India:
Seasonal variation of Aerosol optical depth is studied by plotting Aerosol optical depth over India in different seasons. All the AOD over the study period has been averaged to investigate the Average Aerosol loading over each region in the Indian Sub-continent. The Indian Sub-Continent has different geographic regions with many mountain ranges, Great Plains and plateaus. Figure.1 shows the mean AOD for the study period. The northern part of India, North Western India, Indo Gangetic plain and some of the eastern parts of India are found to have high AOD. The south peninsular India seems to have less AOD when compared to that of the North India and it may be due to the transport of Aerosols due to the Land-Sea winds. The population density is also more in North India when compared to that of the south (Census 2010) which may be contributing to high anthropogenic emissions. More number of industries and thermal power stations are concentrated in the North India. The topography of the indo Gangetic plain does not allow the aerosols to get transported easily (Himalayas on the North and Vindhya range on the south obstructing the wind to transport Aerosols).

The figure also shows that there is transport of dust from Rajasthan and other western parts of India (Pandithurai et al, 2008). Major part of Punjab, Chandigarh and Rajasthan also show high Aerosol content in par with that of IndoGangetic plain and this may be due to the transport of desert dust from the Great Indian Thar desert. Major part of Maharashtra, region around Hyderabad in Andhra Pradesh and some parts of Jharkand show a moderate level of Aerosol Loading.

Interior parts of Kerala, Tamil-Nadu, Andhra Pradesh and major part of Karnataka are found to have less AOD but the coastal regions of the above said states have a moderate level of Aerosol loading and this may be due to the transport of Aerosols from the surrounding water bodies. The important finding is that the AOD seems to be related with the topography. Most of the elevated regions viz. Major part of Karnataka, southern Maharashtra, and western Andhra Pradesh show low AOD. This fact cannot be considered as an artefact as ground based AOD observations in those regions are agreeing with those of MODIS Ganesh et al 2008,2009; Saha et al 2005. The reason may be immediate transport due to winds at higher altitudes. The Aerosol optical depth over the oceans far away from the land has less AOD when compared to those nearer to the land indicating high Anthropogenic loading over the land. It is difficult to study the temporal variation of each location in the study region directly, hence we used a statistical parameter Coefficient of variation (Here after referred to as COV) to study the variability of Aerosol optical depth over the study region. As the COV represents the variability regions of high and low variability of AOD can be figured out. The IndoGangetic plain represents a region of low COV obviously as the region is loaded with aerosols throughout the year irrespective of the season. Most of the elevated regions show high COV indicating high variability of Aerosols over the region. This may be due to the quick transport of Aerosols due to the wind. This indicates that topography is also factor influencing the aerosol loading over a region and it cannot be considered as an artefact as topography is taken care in the MODIS algorithm (Levy et al, 2007) and ground based observations are agreeing with that of MODIS observations. Ganesh et al, 2008 and 2009 and Saha et al, 2005, have reported a maximum value of AOD as 0.327 over Mysore. Vinoj et al, 2004 have shown a high annual variability of aerosols for the period 2001 to 2003 over Bangalore. Singh et al, 2004 showed that the frequency distribution of AOD over Kanpur (located in Indo Gangetic plain) is almost similar in all seasons which indicate that aerosol variability is less and there is a constant source of aerosols in the region. High population density and more industries in this region are sources of aerosols. The aerosol optical depth is separated for each season viz. Summer (March, April and May), Monsoon (June, July, August and September), Post monsoon (October and November) and winter (December, January and February) and plotted separately (figure 3). During summer and Monsoon winds are westerlies. Hence the dust may be transported from the Arabian desert. We have plotted Aerosol index for different seasons for the same region to check whether they are due to high aerosol loading or presence of clouds. Aerosol Index can be measured even in the presence of clouds. Positive values of Aerosol Index indicate desert dust and we find Aerosol Index (Figure.4) is high over the north western part of India and Indo Gangetic plain during summer and monsoon. Hence it can be interpreted that large amount of dust is transported towards north India through the north western part of India. The Great Indian Desert is also a source of dust. This feature is not pronounced in post monsoon and winter. Hence most of the aerosols may be due to transport through wind and the wind direction from Figure.1 also strengthens this statement.

AOD is almost greater than or equal to 0.3 in the southern part of India. The Arabian Sea and Bay of Bengal show high AOD during monsoon. AOD is more over Arabian Sea than over Bay of Bengal which supports the fact that aerosols during monsoon are brought by westerlies. High AOD during monsoon can also be attributed to presence of clouds. This doubt can be cleared by using the Aerosol Index data as it can be retrieved even in the presence of cloud and a cloudy sky will give a more amplified signal (Torres et al, 2007, Manoj et al, 2010).The Aerosol Index also found to be high in monsoons similar to that of AOD supporting MODIS observation of high AOD during monsoon. High Aerosol index values over the Northern India suggest the presence of absorbing aerosols in that region. In the summer north eastern part of India and Bay of Bengal show high AI values whereas north western part of India and Arabian Sea show high AI values during Monsoon.AI values are less in south peninsular India throughout the period of study. This may be due to transport from land to sea. The presence of Absorbing aerosols is evident as AI values are greater than 0.5 over a major region. High Aerosol Index over Arabian sea during Monsoon indicates the presence of dust (dust being Absorbing aerosol) Figure.3. shows that the sub continent is highly loaded with Aerosols in the monsoon when compared with other seasons. The Bay Bengal, Arabian Sea and Indian Ocean seem to be highly loaded in the monsoon.

The Indo Gangetic plain and the north western part of India show high concentration of Aerosols throughout the year. It has considerable aerosol amount even in post monsoon where most of the Aerosols are supposed to be washed out by monsoon rainfall. This strengthens the fact that the aerosols are mainly due to the constant sources present in this region. The population density has increased in states like Bihar, West Bengal Orissa and Tamil Nadu when compared to that of 2001(Census, 2010).The cause for the high aerosol content is presence of industries, mainly coal based thermal power plants (http://www.cpcb.nic.in ,2011)., anthropogenic activity due to dense population.

CONCLUSIONS
Seasonal variations of Aerosol optical depth is studied over Indian Sub continent using MODIS AOD and OMI AI. Aerosol loading is more over North India when compared to that of South India. AOD is more in monsoons and less in winter for the whole study region. Aerosol Index is also high during monsoons which support the presence of high AOD as AI can be retrieved in the presence of clouds. Major part of Karnataka show low AOD throughout the year. In the summer and monsoon season AOD and AI are high and the winds are westerlies indicating the transport of dust from Arabian Desert and Africa. The Arabian Sea shows more AOD than that of Bay of Bengal which strengthens the above statement. AOD is less in winter and the winds are easterlies. As the land is far way from Indian region there is less transport towards India. AOD is less over the high altitude regions and the reason is immediate transport through winds as COV plot shows high variability of AOD over high altitude regions. Aerosol loading is less over elevated regions and the reason may be immediate transport due to wind.

ACKNOWLEDGEMENT
Authors gratefully acknowledge the MODIS and OMI mission scientists and associated NASA personnel for the production of the data used in this research effort. One of the authors (T. Kiran Kumar) thanks Advanced Centre for Atmospheric Sciences for providing junior research fellowship and laboratory facilities for carrying out this work. Authors acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. The authors are also grateful to authors / editors / publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed.

References:

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2. Dey, S., and Di Girolamo, L. (2010). Climatology of aerosol optical and microphysical properties over the Indian subcontinent from 9 years (2000–2008) of Multiangle Imaging Spectroradiometer (MISR) data.J. Geophys. Res., 115(D15), 1- 22. doi: 10.1029/2009JD013395.

3. Ganesh, K. E. (2009). Aerosol Optical Thickness Measurements on Tsunami Day at a Continental Station, Mysore. Aerosol and Air Quality Research, 9(1), 94-104. doi: 10.4209/aaqr.2008.08.0035.

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A Study by M. Muthu Uma Maheswari et al. entitled "A Study on C-reactive Protein and Liver Function Tests in Laboratory RT-PCR Positive Covid-19 Patients in a Tertiary Care Centre – A Retrospective Study" is awarded Best Article of Vol 13 issue 06 Special issue Modern approaches for diagnosis of COVID-19 and current status of awareness
A Study by Gainneos PD et al. entitled "A Comparative Evaluation of the Levels of Salivary IgA in HIV Affected Children and the Children of the General Population within the Age Group of 9 – 12 Years – A Cross-Sectional Study" is awarded Best Article of Vol 13 issue 05 Special issue on Recent Advances in Dentistry for better Oral Health
A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" is awarded Best Article of Vol 13 issue 06
A Study by Chen YY and Ghazali SRB entitled "Lifetime Trauma, posttraumatic stress disorder Symptoms and Early Adolescence Risk Factors for Poor Physical Health Outcome Among Malaysian Adolescents" is awarded Best Article of Vol 13 issue 04 Special issue on Current Updates in Plant Biology to Medicine to Healthcare Awareness in Malaysia
A Study by Kumari PM et al. entitled "Study to Evaluate the Adverse Drug Reactions in a Tertiary Care Teaching Hospital in Tamilnadu - A Cross-Sectional Study" is awarded Best Article for Vol 13 issue 05
A Study by Anu et al. entitled "Effectiveness of Cytological Scoring Systems for Evaluation of Breast Lesion Cytology with its Histopathological Correlation" is awarded Best Article of Vol 13 issue 04
A Study by Sharipov R. Kh. et al. entitled "Interaction of Correction of Lipid Peroxidation Disorders with Oxibral" is awarded Best Article of Vol 13 issue 03
A Study by Tarek Elwakil et al. entitled "Led Light Photobiomodulation Effect on Wound Healing Combined with Phenytoin in Mice Model" is awarded Best Article of Vol 13 issue 02
A Study by Mohita Ray et al. entitled "Accuracy of Intra-Operative Frozen Section Consultation of Gastrointestinal Biopsy Samples in Correlation with the Final Histopathological Diagnosis" is awarded Best Article for Vol 13 issue 01
A Study by Badritdinova MN et al. entitled "Peculiarities of a Pain in Patients with Ischemic Heart Disease in the Presence of Individual Combines of the Metabolic Syndrome" is awarded Best Article for Vol 12 issue 24
A Study by Sindhu Priya E S et al. entitled "Neuroprotective activity of Pyrazolone Derivatives Against Paraquat-induced Oxidative Stress and Locomotor Impairment in Drosophila melanogaster" is awarded Best Article for Vol 12 issue 23
A Study by Habiba Suhail et al. entitled "Effect of Majoon Murmakki in Dysmenorrhoea (Usre Tams): A Standard Controlled Clinical Study" is awarded Best Article for Vol 12 issue 22
A Study by Ghaffar UB et al. entitled "Correlation between Height and Foot Length in Saudi Population in Majmaah, Saudi Arabia" is awarded Best Article for Vol 12 issue 21
A Study by Siti Sarah Binti Maidin entitled "Sleep Well: Mobile Application to Address Sleeping Problems" is awarded Best Article for Vol 12 issue 20
A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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