Seasonal variability in aeolian dust deposition fluxes and their mineralogical composition over the Northeastern Arabian Sea

Suresh, K.; Kumar, Ashwini; Ramaswamy, V.; Babu, C. Prakash

doi:10.1007/s13762-021-03503-y

Cited by 12 publications

(10 citation statements)

References 63 publications

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“…The average Fe/Al ratios for SSD-40 (0.81 ± 0.38) and SSD-55 (0.61 ± 0.15) are found to be relatively higher than those reported by Kumar et al , for samples collected during the intermonsoon period (Fe/Al = 0.51 ± 0.05). However, recently, Suresh et al reported a relatively uniform and enriched Fe/Al ratio (0.78) for the dust collected from rainwater samples during SWM months over the northeastern Arabian Sea, which is comparable to our values. Based on the geochemical proxies (clay mineralogy and radiogenic isotopic composition), Suresh et al , identified the Arabian Peninsula and NE Africa as major sources during SWM months, particularly during August.…”

Section: Resultssupporting

confidence: 91%

“…However, recently, Suresh et al reported a relatively uniform and enriched Fe/Al ratio (0.78) for the dust collected from rainwater samples during SWM months over the northeastern Arabian Sea, which is comparable to our values. Based on the geochemical proxies (clay mineralogy and radiogenic isotopic composition), Suresh et al , identified the Arabian Peninsula and NE Africa as major sources during SWM months, particularly during August. Our varying Fe concentrations during this study period indicate the large heterogeneity of iron content at the major source regions, which have significant implication to the supply of this micronutrient to the surface waters of the Arabian Sea.…”

Section: Resultssupporting

confidence: 91%

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Aeolian Dust and Sea Salt in Marine Aerosols over the Arabian Sea during the Southwest Monsoon: Sources and Spatial Variability

Aswini

Tiwari

Singh

et al. 2022

ACS Earth Space Chem.

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The nutrient supply to the oceanic surface water is largely regulated by the extrinsic and intrinsic ambient atmospheric aerosol properties, particularly chemistry. In this context, we measured the comprehensive chemical composition (inorganic ions and major elements) of atmospheric aerosols and studied their spatial distribution over the Arabian Sea during the southwest monsoon (SWM) period for 2 consecutive years (2017 and 2018). We found that the water-soluble ionic concentration (WSIC) is dominated by Na+ and Cl– ions followed by Ca2+ and SO4 2– with a minor contribution of Mg2+ and NO3 –. The relative contribution of ionic species to WSIC remained similar for both the monsoon seasons with higher WSIC during 2018 (69.3 ± 63 μg m–3) compared to 2017 (40.6 ± 33 μg m–3). Sea salt (estimated from Na+ and Cl– ions) and mineral dust (calculated from the Al concentration) are dominant constituents of aerosols, with negligible contribution from anthropogenic species found to be temporally and spatially consistent during both the campaigns. The mineral dust is characterized by a uniform Nd isotopic signature during both campaigns, indicating its source to the Arabian Peninsula during the study period. Source apportionment of mineral dust using the Nd isotope is supported by back-trajectory analyses as well as satellite retrieved (MODIS and CALIPSO) data. The Cl– deficit, which is mainly attributed to the interaction of sea salt with acidic species, is found to be relatively low (10–12%) compared to that during continental outflow over the Arabian Sea, indicating the insignificant contribution from anthropogenic emissions during the SWM months.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 91%

Aeolian Dust and Sea Salt in Marine Aerosols over the Arabian Sea during the Southwest Monsoon: Sources and Spatial Variability

Aswini

Tiwari

Singh

et al. 2022

ACS Earth Space Chem.

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“…Previous studies have reported the role of episodic Shamal winds and Levar winds, which are derived over the Arabian Peninsula and can contribute to enhanced dust concentration over the North ARS. 46,49,51 We observe a relatively higher dust concentration in these campaigns (mean of SSD-40 and 55: 16 ± 12.3 μg m −3 ) compared to those reported by Pease et al 46 (average = 8 μg m −3 ) two decades back. One of the possible reasons might be attributed to the sampling area being nearer to the source region (in this study) than those during JGOFS, wherein it was mostly sampled in open ocean regions.…”

Section: Spatial Distribution Of Mineral Dust and Total Tesupporting

confidence: 43%

“…The higher Mn % (range = 6−87%, average = 43%) in other sectors may be attributed to the impact of Mn enriched dust from the Arabian Peninsula and Iran. 70 Suresh et al 51 have shown that the Arabian Peninsula is a dominant dust source over the Arabian Sea, based on Sr−Nd isotopic composition, during SWM. This dust derived from the Arabian Peninsula is enriched in Mn-bearing carbonates, 70 which can further enhance soluble Mn contribution.…”

Section: Fractional Solubility Of Te and Controllingmentioning

confidence: 99%

“…An increased frequency of dust storms as well as high dust activity has been reported from the Arabian Peninsula during the months of July−September in contrast to other seasons. 49,51 The favorable meteorological condition (particularly strong SW monsoon winds) has potential to bring a significant amount of dust to the ARS. 50 This may lead to a relatively higher DF for Fe and Al over the ARS during this study.…”

Section: Fractional Solubility Of Te and Controllingmentioning

confidence: 99%

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Bioactive Trace Elements’ Composition and Their Fractional Solubility in Aerosols from the Arabian Sea during the Southwest Monsoon

Panda

Aswini

Bhatt

et al. 2022

ACS Earth Space Chem.

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Atmospheric dust deposition supplies a significant amount of macro-and micronutrients to surface ocean water, thus playing a vital role in modulating phytoplankton growth. In this context, we measured soluble and total bioactive trace elements (TEs; Fe, Mn, and Cu) along with eolian dust concentration in aerosol samples collected over a wide area of the Arabian Sea during the southwest monsoon (SWM) month of two consecutive years (2017 and 2018). Our objective in this study is to assess the spatial variability of TEs and quantify their fluxes over the Arabian Sea. Relatively higher mineral dust concentrations were observed during the campaign period compared to earlier studies over the Arabian Sea. A large spatial variability in total Fe (91−2830 ng m −3 ) and soluble Fe (0.3−32.7 ng m −3 ) concentrations was observed in contrast to Mn and Cu. However, the operational fractional solubility (defined as the fraction of soluble metal leached using ultrapure deionized water out of the total metal) is relatively low (less than 3.6%) for Fe as compared to Mn (range: 6−87%) and Cu (4−79%). Higher enrichment factors were observed for Mn (range: 1−37) and Cu (range: 6−96), particularly in the northern sector, suggesting the partial contribution of TEs from the anthropogenic emissions that is further corroborated by air-mass back trajectory analyses. An inverse hyperbolic relationship between fractional solubility and total metal concentration is observed for Fe (similar to previous observations); however, no such association is found in case of Mn and Cu. The dry deposition fluxes of Fe, Mn, and Cu to surface water of the Arabian Sea were estimated as 757, 38.8, and 1.4 μg m −2 day −1 , respectively. These fluxes are on the higher side compared to those reported from other oceanic regions of the globe.

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Elemental ratios as tracers of the sources of mineral dust in north-eastern Sahara

Boraiy,

El-Metwally,

Borbon

et al. 2023

Int. J. Environ. Sci. Technol.

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The objective of this study is to confirm the possibility of tracing sources of airborne mineral dust using elemental ratios. The region of study is the north-eastern part of the Sahara where dust compositional data were lacking; 272 mineral dust samples collected at 3 experimental stations of Egypt were analyzed by X-ray fluorescence. Based on the mineral dust concentration, 65% of the samples correspond to moderate (3–10 μg m−3), 22% to medium (10–25 μg m−3), and 13% to intense (> 25 μg m−3) dust events. The Ca/Al and (Mg + Ca)/Fe ratios were found to be strongly correlated and their ranges of variation to cover are more than one order of magnitude, which confirms their interest for the tracing of the dust sources. Using a combination of MODIS satellite observations, HYSPLIT back-trajectory analysis, and simulations with dust emission models, the large (> 6) and intermediate (2–6) Ca/Al ratios were shown to correspond to dust originating from saline playas (chotts) and calcareous surfaces, respectively. Conversely, the lowest (< 2) ratios correspond to dust emitted by siliceous sand seas (ergs). Therefore, a classification of the dust in 3 categories (erg-like, calcareous, and chott-like) based on Ca/Al is proposed. The events of moderate to medium intensity are dominated by chott-like and calcareous dust, which suggests that these sources are activated during erosion events of limited (local) extension. Conversely, the fact that the dust composition is more likely to be of the erg-like type during intense events underlines the dominant role played by sand dune fields during major erosion events.

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Seasonal variability in aeolian dust deposition fluxes and their mineralogical composition over the Northeastern Arabian Sea

Cited by 12 publications

References 63 publications

Aeolian Dust and Sea Salt in Marine Aerosols over the Arabian Sea during the Southwest Monsoon: Sources and Spatial Variability

Aeolian Dust and Sea Salt in Marine Aerosols over the Arabian Sea during the Southwest Monsoon: Sources and Spatial Variability

Bioactive Trace Elements’ Composition and Their Fractional Solubility in Aerosols from the Arabian Sea during the Southwest Monsoon

Elemental ratios as tracers of the sources of mineral dust in north-eastern Sahara

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