Radiative effect of dust aerosols on cloud microphysics and meso-scale dynamics during monsoon breaks over Arabian sea

Harikishan, G.; Padmakumari, B.; Maheskumar, R. S.; Kulkarni, J. R.

doi:10.1016/j.atmosenv.2015.01.037

Cited by 21 publications

(8 citation statements)

References 40 publications

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“…In contrast, other model simulations showed increase in rainfall over northern India (Vinoj et al, 2014) for higher dust activity. The dustrainfall interactions over south Asia is a complex phenomenon, even difficult to be simulated, since indirect aerosol effects on warm and ice clouds, cloud albedo, lifetime and convective precipitation have not been simulated; all these have a strong regional impact that is difficult to be assessed (Padmakumari et al, 2013;Harikishan et al, 2015).…”

Section: Cashki Variation and Indian Summer Monsoonmentioning

confidence: 99%

The Caspian Sea–Hindu Kush Index (CasHKI): A regulatory factor for dust activity over southwest Asia

Kaskaoutis

Houssos

Rashki

et al. 2016

Global and Planetary Change

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Section: Cashki Variation and Indian Summer Monsoonmentioning

confidence: 99%

The Caspian Sea–Hindu Kush Index (CasHKI): A regulatory factor for dust activity over southwest Asia

Kaskaoutis

Houssos

Rashki

et al. 2016

Global and Planetary Change

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“…Several studies (Barkan et al, 2005;Washington et al, 2006;Todd et al, 2008;Basart et al, 2012;Ben-Ami et al, 2012;Israelevich et al, 2012;Pey et al, 2013;Fiedler et al, 2014;Salvador et al, 2014) have revealed that emission, vertical distribution and transport of Saharan dust over the Atlantic Ocean and the Mediterranean Basin are strongly interlinked with meteorological variations and climate dynamics. Although atmospheric circulation patterns associated with dust storms are also well known over the Middle East (Awad and Mashat, 2013;Hamidi et al, 2013;Najafi et al, 2014;Saeed et al, 2014), lack of specific knowledge still exists over SW Asia, where changes in the continental dust emissions and transport over the Arabian Sea may modify dust-cloud-precipitation interactions (Padmakumari et al, 2013;Harikishan et al, 2015) and ISM rainfall (Rahul et al, 2008;Gautam et al, 2009;Vinoj et al, 2014;Solmon et al, 2015;Jin et al, 2016). Therefore, although the major dust sources over SW Asia and their seasonality are very well known (Middleton, 1986;Prospero et al, 2002;Ginoux et al, 2012;Rashki et al, 2014;Cao et al, 2015), the atmospheric circulation and meteorological processes modulating the dust activity have not been evaluated so far.…”

Section: Introductionmentioning

confidence: 99%

Assessment of changes in atmospheric dynamics and dust activity over southwest Asia using the Caspian Sea–Hindu Kush Index

Kaskaoutis

Rashki

Houssos

et al. 2017

Intl Journal of Climatology

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This study examines the influence of the Caspian Sea–Hindu Kush Index (CasHKI) on local and synoptic meteorology as well as on dust emissions over southwest (SW) Asia by means of National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP‐NCAR) re‐analysed mean sea‐level pressure (MSLP), geopotential height at 700 hPa and surface meridional wind, along with meteorological data at Zabol, east Iran and Meteosat/Infrared Difference Dust Index (IDDI) retrievals. The analysis focuses on the summer period (June to September) of 2000–2014 and the winter period (November to March) of 1963–2014. The CasHKI values are mostly controlled by the MSLP anomalies over the Caspian Sea (CS) domain, varying from approximately −25 to +35 hPa in winter and from approximately−10 to +14 hPa in summer, but without a clear annual pattern. The CasHKI values are classified into four modes for each month depending on their intensity. In the summer months, the high CasHKI mode is associated with enhanced MSLP over central Asia and deepening of the Indo‐Pakistan thermal low associated with the Indian summer monsoon. At 700‐hPa level, the high CasHKI mode shows an enhancement of the Arabian ridge, expanding it to the north over Iran and the CS, with a concurrent strengthening of the Indian trough, leading to intensification of northerly winds along east Iran. This results in significant increase in dust activity over SW Asia, which is also apparent in the winter months. Furthermore, the intensification of the northerly flow associated with the high CasHKI modes drops the temperature and increases the relative humidity over Zabol, especially during winter. The SPRINTARS‐model simulations also show increased dust emissions and concentrations for the high CasHKI values, confirming that the CasHKI variations modulate the dust activity over SW Asia throughout the year.

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“…However, over the WG region, precipitation continuously increases with an increasing AOD. During the monsoon, the dust that originated as an aerosol, such as quartz, calcite, dolomite and clay minerals (Mishra et al, 2010;Harikishan et al, 2015), from Arabian desert regions entered the mixed-phase region through the warm region of shallow convective cloud over the WG region. These dust aerosols will act as efficient ice nuclei and contribute to ice formation (Maheskumar et al, 2018).…”

Section: Correlation Between Cloud and Aerosol Parametersmentioning

confidence: 99%

Evaluation of convective storms using spaceborne radars over the Indo‐Gangetic Plains and western coast of India

Mangla

Indu

Lakshmi

2020

Meteorological Applications

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Monsoonal convective systems are examined using four years (2014)(2015)(2016)(2017) of radar reflectivity data from the Precipitation Features (PFs) database of the Global Precipitation Measurement (GPM) Microwave Imager (GMI) and Dual Precipitation Radar (DPR). The study classifies the cumulonimbus tower (PF-CbT) at 12 km, and intense convective clouds at both 3 km (PF-ICC3) and 8 km (PF-ICC8) based on PFs' reflectivity threshold at a reference height over the Indo-Gangetic Plains (IGP) and Indian Western coastal (WG) region, including the Arabian Sea and the Western Ghats. Results show that the regional variations are more enhanced for the PF-ICC3 clouds with high occurrence over the IGP region. In the mixed-phase regime, the median maximum reflectivity is greater for all cloud types over the IGP region. The occurrences of 20 and 40 dBZ echo the top height > 5 km is higher in the IGP region, indicating the deep and intense convection. The aerosol-cloud interaction is examined for warm and mixed-phase clouds. The vertical structure of aerosols shows the suppression of warm rainfall over the IGP region. However, rainfall intensity increases in mixed-phase clouds because of the dominancy of ice processes. The significant positive (negative) correlation is observed between the echo top height and aerosol concentrations over the IGP (WG) region. The value of the novel findings clearly states the region-specific demand for a closer examination of the radar reflectivity-aerosol interaction on regime-dependent clouds over the IGP region as well as contrasts against other regions for similar and contrasting cloud-aerosol-radiation interactions.

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Radiative effect of dust aerosols on cloud microphysics and meso-scale dynamics during monsoon breaks over Arabian sea

Cited by 21 publications

References 40 publications

The Caspian Sea–Hindu Kush Index (CasHKI): A regulatory factor for dust activity over southwest Asia

The Caspian Sea–Hindu Kush Index (CasHKI): A regulatory factor for dust activity over southwest Asia

Assessment of changes in atmospheric dynamics and dust activity over southwest Asia using the Caspian Sea–Hindu Kush Index

Evaluation of convective storms using spaceborne radars over the Indo‐Gangetic Plains and western coast of India

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