Revisiting the observed correlation between weekly averaged Indian monsoon precipitation and Arabian Sea aerosol optical depth

Sharma, Deepti; Miller, Ron

doi:10.1002/2017gl074373

Cited by 25 publications

(13 citation statements)

References 78 publications

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“…Moreover, sea salt should be also taken into account in the studies of the interactions between aerosols over the Arabian Sea and the ISM system. Recently, Sharma and Miller (2017) reproduced the observed correlation between AOD over the Arabian Sea and the ISM rainfall even when omitting dust aerosols' radiative effects (i.e., dust AOD calculated as a diagnostic) in their simulations.…”

Section: Conclusion and Discussionmentioning

confidence: 86%

“…Moreover, sea salt should be also taken into account in the studies of the interactions between aerosols over the Arabian Sea and the ISM system. Recently, Sharma and Miller () reproduced the observed correlation between AOD over the Arabian Sea and the ISM rainfall even when omitting dust aerosols' radiative effects (i.e., dust AOD calculated as a diagnostic) in their simulations. They hypothesized that such observed correlation is caused by the effects of the ISM rainfall on the emission and transport of dust aerosols over the remote dust source regions within the Arabian Peninsula.…”

Section: Conclusion and Discussionmentioning

confidence: 96%

“…Aerosols over the Arabian Sea and the Middle East play important roles in modulating the IMS system, reducing visibility, and degrading air quality; therefore, more and more attention has been paid to these aerosols (Jin et al, , , , ; Kaskaoutis et al, ; Sanap & Pandithurai, ; Solmon et al, ; Vinoj et al, ), including an ongoing discussion on the impacts of Indian monsoon circulation on dust emissions in the Middle East (Attada et al, ; Sharma & Miller, ). This study thoroughly examines the compositions, transport pathways, and trends of these aerosols over the Arabian Sea in the summer, and thus has important implications for future studies of dust‐regional climate interaction.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

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High Summertime Aerosol Loadings Over the Arabian Sea and Their Transport Pathways

Jin

Wei

et al. 2018

JGR Atmospheres

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Satellite observations show high aerosol loadings over the Arabian Sea in boreal summer, which have great impacts on the Indian monsoon due to absorbing dust aerosols. However, the compositions, origins, transport pathways, and decadal trends of these aerosols have not been well studied. In this study, using multiple satellite retrievals, a back trajectory model, and reanalysis data, we found that (1) aerosol optical depth (AOD) over the Arabian Sea and Arabian Peninsula have a summer peak and dust aerosols dominate the AOD; aerosol reanalysis data tend to considerably underestimate dust AOD compared to satellite data, indicating challenges of extracting dust from total AOD; (2) aerosols over the Arabian Sea are largely transported from South and East Arabian Peninsula by cyclonic winds in the lower troposphere (850 hPa) and from Iran–Afghanistan–Pakistan by anticyclonic winds in the middle troposphere (500 hPa); (3) both case studies and composite analyses show that extremely high aerosol loadings over the Arabian Sea is associated with an abnormally low pressure over the Arabian Sea and the Middle East; and (4) significant positive trends in AOD over the Arabian Peninsula and the Arabian Sea exist during 2000–2011 but disappear during 2000–2016, indicating a strong interdecadal variability of dust activities. This study revealed pathways linking dust emissions in the Middle East to high summertime AOD over the Arabian Sea and identified the atmospheric conditions favorable for dust emissions and transport.

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Section: Conclusion and Discussionmentioning

confidence: 86%

Section: Conclusion and Discussionmentioning

confidence: 96%

Section: Conclusion and Discussionmentioning

confidence: 99%

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High Summertime Aerosol Loadings Over the Arabian Sea and Their Transport Pathways

Jin

Wei

et al. 2018

JGR Atmospheres

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“…Studies have shown that the radiative effect of dust can affect a wide range of environmental processes. Dust is shown to modulate West African (e.g., Miller and Tegen, 1998;Miller et al, 2004;Mahowald et al, 2010;Strong et al, 2015) and Indian (e.g., Jin et al, 2014;Vinoj et al, 2014;Jin et al, 2015;Jin et al, 2016;Solmon et al, 2015;Kim et al, 2016;Sharma and Miller, 2017) monsoonal precipitation. During severe droughts in North America, there is a positive feedback between dust and the hydrological cycle (Cook et al, 2008(Cook et al, , 2009.…”

Section: Introductionmentioning

confidence: 99%

Retrieving the global distribution of threshold of wind erosion from satellite data and implementing it into the GFDL AM4.0/LM4.0 model

Ginoux

Guo

et al. 2019

Preprint

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Abstract. Dust emission is initiated when surface wind velocities exceed the threshold of wind erosion. Most dust models used constant threshold values globally. Here we use satellite products to characterize the frequency of dust events and surface properties. By matching this frequency derived from Moderate Resolution Imaging Spectroradiometer (MODIS) Deep Blue aerosol products with surface winds, we are able to retrieve a climatological monthly global distribution of wind erosion threshold (Vthreshold) over dry and sparsely-vegetated surface. This monthly two-dimensional threshold velocity is then implemented into the Geophysical Fluid Dynamics Laboratory coupled land-atmosphere model (AM4.0/LM4.0). It is found that the climatology of dust optical depth (DOD) and total aerosol optical depth, surface PM10 dust concentrations, and seasonal cycle of DOD are better captured over the <q>dust belt</q> (i.e. North Africa and the Middle East) by simulations with the new wind erosion threshold than those using the default globally constant threshold. The most significant improvement is the frequency distribution of dust events, which is generally ignored in model evaluation. By using monthly rather than annual mean Vthreshold, all comparisons with observations are further improved. The monthly global threshold of wind erosion can be retrieved under different spatial resolutions to match the resolution of dust models and thus can help improve the simulations of dust climatology and seasonal cycle as well as dust forecasting.

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“…However, the lead-lag relation shows that the rainfall and dust vary over a time scale of about 1-2 weeks (Jin et al, 2014;Vinoj et al, 2014). Sharma and Miller (2017) illustrated that the radiative property of dust is not the sole reason for the short scale temporal variability of the ISM. The interrelation between Middle East dust and the ISM has also been related on an interannual to interdecadal time scale (Solmon et al, 2015).…”

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confidence: 99%

Redistribution of Indian summer monsoon by dust aerosol forcing

Maharana

Dimri

Choudhary

2019

Meteorological Applications

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Previous studies based on models and observations show that dust aerosols have an impact on the timing and distribution of the Indian summer monsoon but the transition of various Indian summer monsoon‐associated atmospheric features which unfolds in the process is still not clear. Through regional climate simulations, this study identifies the different phases of the change in the mean distribution of monsoon related characteristics in response to local dust forcing. The deposition of dust along the slopes of the Tibetan Plateau results in a heated atmospheric column (elevated heat pump) over there starting from May. This drags the monsoonal flow towards the foothills of the Himalayas before the conventional monsoon onset over India, which tends to decrease the rainfall over central India and increase it along the foothills of the Himalayas during May and June. July is the period of transition during which the reversal of various atmospheric conditions takes place. The elevated heat pump completely vanishes with the wet deposition of dust, which reduces the vertical wind over the Tibetan Plateau. The removal of dust increases the temperature over the Indo‐Gangetic plain, which efficiently drags the moisture carrying southwesterly towards central India. Meanwhile, stronger horizontal divergence of moisture towards the Bay of Bengal reduces the rainfall over central India and these atmospheric conditions further intensify during August. These results provide strong evidence of the role of dust aerosols in shaping the Indian summer monsoon distribution over India.

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Revisiting the observed correlation between weekly averaged Indian monsoon precipitation and Arabian Sea aerosol optical depth

Cited by 25 publications

References 78 publications

High Summertime Aerosol Loadings Over the Arabian Sea and Their Transport Pathways

High Summertime Aerosol Loadings Over the Arabian Sea and Their Transport Pathways

Retrieving the global distribution of threshold of wind erosion from satellite data and implementing it into the GFDL AM4.0/LM4.0 model

Redistribution of Indian summer monsoon by dust aerosol forcing

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