Spatial and seasonal variations of sand-dust events and their relation to atmospheric conditions and vegetation cover in semi-arid regions of central Iran

Khusfi, Zohre Ebrahimi; Khosroshahi, Mohammad; Roustaei, Fatemeh; Mirakbari, Maryam

doi:10.1016/j.geoderma.2020.114225

Cited by 45 publications

(8 citation statements)

References 82 publications

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“…Touré, et al [35] highlighted the sensitivity of wind erosion to vegetation, showing that even a low cover rate has a strong impact on wind erosion. In Iran, Khusfi et al [36] and Khusfi et al [37] observed a significant negative relationship between the Enhanced Vegetation Index (EVI) and Dust Storm Index (DSI) changes in the spring season. Based on observations and wind tunnel tests, Cheng et al [38] quantitatively established the relationship between the wind erosion rate and its effect on vegetationcovered soil surfaces.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Characteristics of Sediments Found in Typical Landscapes in the Playa of Ebinur Lake, Arid Central Asia

Abuduwaili

2021

Land

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A playa usually refers to a salt desert landscape mainly composed of loose and fine lacustrine sediments. Severe wind erosion on a playa causes the playa to become a source of dust and salt dust and poses a threat to vast areas downwind. Currently, little is known about the impact of wind erosion on the particle size distribution of sediments in different landscapes in the playa. In the present study, six dominant different landscapes in a natural state with the same sedimentary environment in the playa of Ebinur Lake were selected to provide insights into the different characteristics of particle size distribution under the effect of long-term wind erosion. The results reveal that the grain-size composition clearly differed among different landscapes. All samples had a common dominant size group consisting of very fine sand and sand. The very fine sand and sand content of Haloxylon ammodendron desert zone (LS5) was the lowest, while the clay and silt content was the highest at both depths among the six landscapes. The lowest clay and silt fraction and highest sand fraction appeared in the herbal desert zone (LS3) at both depths. Almost all of the sediment samples were of a bimodal distribution mode, with significant differences. The cumulative curve showed a similar S-shape, while the probability cumulative curve showed an inverted S-shape with three subpopulations of granularity characteristics. The smallest mean particle diameter appeared in LS5. The majority of the sediments were moderately to poorly sorted. The mean particle size of the sediments from the six landscapes was significantly different (p < 0.05), while no significant difference was observed among the other three parameters. Generally, it can be inferred that LS5 can reduce wind speed effectively, probably due to the smaller leaves and dense branches of Haloxylon ammodendron, which results in a high level of coverage. The results of the present study will have some implications for the grain size characteristics for changes in intensity in regional wind erosion environment and will also have some basis for wind erosion prevention and control in the playa of Ebinur Lake.

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Section: Introductionmentioning

confidence: 99%

Grain Size Characteristics of Sediments Found in Typical Landscapes in the Playa of Ebinur Lake, Arid Central Asia

Abuduwaili

2021

Land

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“…It may be due to the changes in soil moisture, amount of rainfall and temperature which are minimum in winter and maximum in summer as revealed by (Alavi et al, 2016) or it may be due to amount of dust-fall which is maximum in winter and minimum in summer, dust carry heavy metals and deposit them on soil according to the study of (Sun et al, 2020) on dust pollution. On temporal scale dust in maximum concentration was recorded in winter followed by autumn, higher dust concentration may be due to low rainfall, high humidity, low temperature, cool wind and dust storms as revealed by (Khus et al, 2020). Minimum dust concentration was recorded in spring followed by summer, lower dust concentration may be due high rainfall, low humidity and high temperature as studied by (Behrouzi et al, 2019;Khus et al, 2020) in their study on seasonal variations in dust pollution.…”

Section: Soil and Dust Analysismentioning

confidence: 89%

The impact of Heavy dust pollution reduces biodiversity by altering the metabolism and biochemical characteristics of Fagonia indica

Sultan,

Ahmad,

Abbas

et al. 2024

Preprint

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Present study was conducted to explore the population dynamics in vegetation of Kirana Hills, Sargodha growing under extreme dust pollution of stone crushing industry. Through extensive survey study sites were selected and floristic composition of the area was also completed. Heavy metal analysis of the dust revealed that all heavy metals were higher at extreme dust sites particularly in winter. The soil at each site and at each season varies based on the soil analysis. Vegetation data was collected by using quadrate method. Density, frequency, coverage and importance value of vegetation was significantly decreased at extreme dust sites specifically in winter. Fagonia indica was collected throughout the study sites and evaluated for morpho-anatomical, biochemical, and physiological characteristics. Metabolic and morpho-anatomical features of all plants were severely affected at extreme dust sites, however high metabolic rate, high sclerification in leaf, root and stem along with presence of large aerenchyma cells in roots were also noticed at extreme dust sites, and these modifications help to survive in such harsh dust polluted environment. In biochemical parameters reactive oxygen species (H2O2) production was increased at extreme dust sites, furthermore activity of enzymatic antioxidants, non-enzymatic antioxidants and osmoprotectant were increased at extreme dust sites in F. indica. Metabolic rate and concentration of heavy metals in selected ecotype also increased at extreme dust sites.

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“…Furthermore, extreme dryness in recent years (Ashraf et al 2021 ) led to unstable soil as a result of groundwater depletion, more soil erosion, and dust storms with local sources (Ebrahimi Khusfi et al 2020 ) will be expected to happen. They will be brought to the city by high potential VC in the southwest of the city, since the gap of PM 10 and PM 2.5 have increased in the period of the polluted episode.…”

Section: Discussionmentioning

confidence: 99%

Role of urban boundary layer dynamics and ventilation efficiency in a severe air pollution episode in Tehran, Iran

Azargoshasbi,

Ashrafi,

Ehsani

2023

Meteorol Atmos Phys

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Tehran faces a significant health challenge due to severe air pollution episodes during wintertime, which are associated with high concentrations of fine particulate matter with a diameter less than 2.5 µm (PM 2.5 ). In this study, we investigated meteorology conditions of one of the severe air pollution episodes, occurred from 27th December 2020 to 15th January 2021, using the Weather Research and Forecasting (WRF) model. To gain insights into this episode, we also modeled a clean episode for comparison. Model validation of land surface temperature using remote sensing showed acceptable performance as well as ground observations for other parameters. We then calculated the ventilation coefficient (VC) from the WRF outputs and analyzed the results statistically. Results indicate the severe reduction in both VC and planetary boundary layer height (PBLH) during the polluted episode. We further linked the decrease in PBLH and VC of the polluted episode to a high-pressure system above 1020 hPa. In contrast, the results for the clean episode indicate that the low-pressure system as low as 1010 hPa led to higher PBLH and VC than during the polluted episode. This low-pressure system favors the reduction of PM 2.5 levels to lower than 21 μgm −3 .

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Spatial and seasonal variations of sand-dust events and their relation to atmospheric conditions and vegetation cover in semi-arid regions of central Iran

Cited by 45 publications

References 82 publications

Grain Size Characteristics of Sediments Found in Typical Landscapes in the Playa of Ebinur Lake, Arid Central Asia

Grain Size Characteristics of Sediments Found in Typical Landscapes in the Playa of Ebinur Lake, Arid Central Asia

The impact of Heavy dust pollution reduces biodiversity by altering the metabolism and biochemical characteristics of Fagonia indica

Role of urban boundary layer dynamics and ventilation efficiency in a severe air pollution episode in Tehran, Iran

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