Identification of aerosol type over the Arabian Sea in the premonsoon season during the Integrated Campaign for Aerosols, Gases and Radiation Budget (ICARB)

Kalapureddy, M. C. R.; Kaskaoutis, Dimitris G.; Raj, P. Ernest; Devara, P. C. S.; Kambezidis, H. D.; Kosmopoulos, Panagiotis; Nastos, Panagiotis T.

doi:10.1029/2009jd011826

Cited by 95 publications

(77 citation statements)

References 73 publications

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“…During the past decades, a series of studies on aerosol optical properties and associated direct radiative effects continue to emerge over Amazonia [3,17], Southeast Asia [18,19], Northeast India [11,20,[23][24][25][26][27][28][29], Central India [12], and global land [2,[30][31][32][33] and ocean [4,5,21]. The results showed that the averaged ADRE at TOA was negative at global scale [4][5][6], but it varied regionally probably due to the comprehensive effects of aerosol optical properties and underlying surface characteristics.…”

Section: Introductionmentioning

confidence: 82%

Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Wang

Lin

et al. 2017

Remote Sensing

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Abstract:The spatiotemporal variation of aerosol optical depth at 550 nm (AOD 550 ), Ångström exponent at 470-660 nm (AE ), water vapor content (WVC), and shortwave (SW) instantaneous aerosol direct radiative effects (IADRE) at the top-of-atmosphere (TOA) in clear skies obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) and Clouds and the Earth's Radiant Energy System (CERES) are quantitatively analyzed over the Yangtze River Basin (YRB) in China during [2001][2002][2003][2004][2005][2006][2007][2008][2009][2010][2011][2012][2013][2014][2015]. The annual and seasonal frequency distributions of AE and AOD 550 reveal the dominance of fine aerosol particles over YRB. The regional average AOD 550 is 0.49 ± 0.31, with high value in spring (0.58 ± 0.35) and low value in winter (0.42 ± 0.29). The higher AOD 550 (≥0.6) is observed in midstream and downstream regions of YRB and Sichuan Basin due to local anthropogenic emissions and long-distance transport of dust particles, while lower AOD 550 (≤0.3) is in high mountains of upstream regions. The IADRE is estimated using a linear relationship between SW upward flux and coincident AOD 550 from CERES and MODIS at the satellite passing time. The regional average IADRE is −35.60 ± 6.71 Wm −2 , with high value (−40.71 ± 6.86 Wm −2 ) in summer and low value (−29.19 ± 7.04 Wm −2 ) in winter, suggesting a significant cooling effect at TOA. The IADRE at TOA is lower over Yangtze River Delta (YRD) (≤−30 Wm −2 ) and higher in midstream region of YRB, Sichuan Basin and the source area of YRB (≥−45 Wm −2 ). The correlation coefficient between the 15-year monthly IADRE and AOD 550 values is 0.63, which confirms the consistent spatiotemporal variation patterns over most of the YRB. However, a good agreement between IADRE and AOD is not observed in YRD and the source area of YRB, which is probably due to the combined effects of aerosol and surface properties.

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Section: Introductionmentioning

confidence: 82%

Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Wang

Lin

et al. 2017

Remote Sensing

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“…spectral variation of α, was introduced to provide additional information about the aerosol size distribution and their types as well as the potential sources. Several studies have been thus performed to classify the aerosol types over the globe, based upon the values of these three parameters (Eck et al, , 2003Schuster et al, 2006;Kalapureddy et al, 2009;Kaskaoutis et al, 2007Kaskaoutis et al, , 2009Kaskaoutis et al, , 2010Kaskaoutis et al, , 2011. Gobbi et al (2007) proposed a graphical framework to visualise the contribution of fine aerosols to AOD, reveal the modal radius of the fine particles (R f ) and segregate the aerosol growth by humidification and cloud contamination.…”

Section: Methodsmentioning

confidence: 99%

Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques

et al. 2012

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Abstract. 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 theÅngström exponent (α) in the 440-870 nm range and the difference in α values [dα = α (440-675 − α(675-870)] including the size of finemode particles (R f ) 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.

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“…A similar transition was seen during two cruises in the Arabian Sea with the RV Sagar Kanya during March-June 2003 Moorthy et al, 2005a), with a rapid decrease in BC mass fraction from ∼2.5% in March to 0.5% in June, and similar decreases in the anthropogenic influence over the Arabian Sea during the onset-MTP were seen during the ICARB cruise . ICARB observations of AOD and the Angstrom exponent (the wavelength dependence of the extinction of shortwave radiation by the aerosols) by Kaskaoutis et al (2010) and Kalapureddy et al (2009) indicated a very strong spatial heterogeneity in the Arabian Sea during this period. Highly polluted airmasses containing small urban particles were still observed near the coasts like in the winter monsoon; relatively high AOD values were also observed in the northern Arabian Sea, associated mainly with mineral dust.…”

Section: The Monsoon Transition Period Plumesmentioning

confidence: 99%

Atmospheric pollutant outflow from southern Asia: a review

2010

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Abstract. Southern Asia, extending from Pakistan and Afghanistan to Indonesia and Papua New Guinea, is one of the most heavily populated regions of the world. Biofuel and biomass burning play a disproportionately large role in the emissions of most key pollutant gases and aerosols there, in contrast to much of the rest of the Northern Hemisphere, where fossil fuel burning and industrial processes tend to dominate. This results in polluted air masses which are enriched in carbon-containing aerosols, carbon monoxide, and hydrocarbons. The outflow and long-distance transport of these polluted air masses is characterized by three distinct seasonal circulation patterns: the winter monsoon, the summer monsoon, and the monsoon transition periods. During winter, the near-surface flow is mostly northeasterly, and the regional pollution forms a thick haze layer in the lower troposphere which spreads out over millions of square km between southern Asia and the Intertropical Convergence Zone (ITCZ), located several degrees south of the equator over the Indian Ocean during this period. During summer, the heavy monsoon rains effectively remove soluble gases and aerosols. Less soluble species, on the other hand, are lifted to the upper troposphere in deep convective clouds, and are then transported away from the region by strong upper tropospheric winds, particularly towards northern Africa and the Mediterranean in the tropical easterly jet. Part of the pollution can reach the tropical tropopause layer, the gateway to the stratosphere. During the monsoon transition periods, the flow across the Indian Ocean is primarily zonal, and strong pollution plumes originating from both southeastern Asia and from Africa spread across the central Indian Ocean. This paper provides a review of the current state of knowledge based on the many observational and modeling studies over the last decades that have examined the southern AsianCorrespondence to: M. G. Lawrence (mark.lawrence@mpic.de) atmospheric pollutant outflow and its large scale effects. An outlook is provided as a guideline for future research, pointing out particularly critical issues such as: resolving discrepancies between top down and bottom up emissions estimates; assessing the processing and aging of the pollutant outflow; developing a better understanding of the observed elevated pollutant layers and their relationship to local sea breeze and large scale monsoon circulations; and determining the impacts of the pollutant outflow on the Asian monsoon meteorology and the regional hydrological cycle, in particular the mountain cryospheric reservoirs and the fresh water supply, which in turn directly impact the lives of over a billion inhabitants of southern Asia.

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Identification of aerosol type over the Arabian Sea in the premonsoon season during the Integrated Campaign for Aerosols, Gases and Radiation Budget (ICARB)

Cited by 95 publications

References 73 publications

Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Aerosol Optical Properties and Associated Direct Radiative Forcing over the Yangtze River Basin during 2001–2015

Characteristics of aerosols over Hyderabad in southern Peninsular India: synergy in the classification techniques

Atmospheric pollutant outflow from southern Asia: a review

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