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

Kaskaoutis, D. G.; Rashki, Alireza; Houssos, E. E.; Legrand, Michel; François, Philippe; Bartzokas, A.; Kambezidis, H. D.; Dumka, U. C.; Goto, Daisuke

doi:10.1002/joc.5053

Cited by 35 publications

(21 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The seasonal upper atmospheric systems indicated that while in winter, the Arabian Peninsula is affected by the trough of the northern cyclone, it is affected by the ridge of the subtropical anticyclone during the other seasons. In addition, the wind patterns associated with atmospheric systems influence the area change from the anticyclonic wind in winter, represented by the wind systems associated with dust, as described in previous studies (Barkan and Alpert, ; Shalaby et al ., ), to the north‐northeastern wind in summer and spring, represented by what is called the Shamal system (Hamidi et al ., ; Houssos et al ., ; Kaskaoutis et al ., ), and then shifting to an anticyclonic wind in autumn.…”

Section: Discussionmentioning

confidence: 97%

“…At the same time, the western anticyclone has a strong effect on the region (summer season) or exhibits a pronounced ridge (autumn season). In addition, the atmospheric systems in the summer pattern interact and form a northerly wind over the eastern Arabian Peninsula (Hamidi et al ., ; Houssos et al ., ; Kaskaoutis et al ., ) and an anticyclonic wind pattern over the southeastern Arabian Peninsula, which is in agreement with the results reported by Rezazadeh et al . (), Barkan and Alpert (), and Shalaby et al .…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Monthly and seasonal variability of dust events over northern Saudi Arabia

Mashat

Awad

Alamoudi

et al. 2019

Intl Journal of Climatology

View full text Add to dashboard Cite

The monthly and seasonal variability and distribution of dust events over northern Saudi Arabia were studied using ground‐based measurements from 11 surface stations for the period of 1978–2010. Additionally, to study the synoptic climatology of the dust variability, the aerosol index (AI) data from the Total Ozone Mapping Spectrometer (TOMS) satellite and meteorological data from the National Center for Environmental Prediction and National Center for Atmospheric Research (NCEP/NCAR) reanalysis datasets were used. The dust types observed at the surface stations are classified into two categories: weak dust and dust storms. A statistical study of the ground measurements demonstrated that weak dust category events are prevalent in the cold months, whereas storm category events are prevalent in the hot months. Additionally, the annual distribution distinguishes two periods for dust observations, before and after 1989, where the number of events in the first period is lower than the annual average but increases during the second period. The synoptic climate study indicated that two main atmospheric wind patterns, anticyclonic and northerly (shamal) patterns, accompany the dust events in the study area. The dust in winter and autumn is mainly affected by the anticyclonic pattern, while that in spring and summer is mainly affected by the shamal pattern. In addition, a synoptic study of selected cases confirmed the climate results and demonstrated the existence of two atmospheric patterns corresponding to winter and summer. Both patterns include troughs over the Red Sea and Arabian Gulf and a ridge or high‐pressure cell over the eastern Mediterranean region during the summer atmospheric pattern and over the mid‐Arabian Peninsula during the winter atmospheric pattern. The characteristic of non‐dust storm composition demonstrated that the storms exhibit pronounced synoptic systems (winter and summer) with the highest pressure/geopotential gradient near the Arabian Peninsula.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Monthly and seasonal variability of dust events over northern Saudi Arabia

Mashat

Awad

Alamoudi

et al. 2019

Intl Journal of Climatology

View full text Add to dashboard Cite

show abstract

“…In their classification of dust systems, Hamidi et al (2013) found that the local extent of the SH is related to the development of the frontal dust system regime over the region. Moreover, Kaskaoutis et al (2016Kaskaoutis et al ( , 2017 developed a meteorological index based on the differences in sea level pressure (SLP) anomalies between high-pressure systems over the Caspian Sea region and low-pressure systems over the Hindu Kush area, as the intensities of these systems are related to the production of strong northerly winds and an increase in dust activity over southwest Asia.…”

Section: Introductionmentioning

confidence: 99%

The variability of the Siberian high ridge over the Middle East

Labban

Mashat

Awad

2020

Intl Journal of Climatology

View full text Add to dashboard Cite

An objective method was developed to detect local cells of the Siberian high (SH) over the Middle East, and mean sea level pressure (SLP) data from the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis dataset were used to specify the centers of local SH cells and associated ridges. The results indicated that approximately 25.8% of winter SH cells influence the Middle East, and this influence diminishes from December to February. Synoptically, the area between the Black and Caspian Seas represents a remote area for sensing the influences of the SH on the Middle East. Although the SH is considered a shallow system, the variability of the effectiveness of the SH throughout the Middle East was estimated from the integration of atmospheric systems at the whole-atmosphere scale (from the surface to 200 hPa). Further, this study demonstrated that the westward extension of the SH over the Middle East is associated with weak cyclogenesis in the area between the Black and Caspian Seas; that is, the atmospheric systems are favourable for strengthening the upper-layer ridge in this area. However, the eastward retreat of the SH extension from the Middle East is associated with strong cyclogenesis in the area between the Black and Caspian Seas; that is, the atmospheric systems are unfavourable for strengthening the upper-layer ridge in this area. This study revealed the importance of the SH in the generation of the pressure gradient over the Arabian Peninsula and the associated development of dust storms and the Red Sea Trough.

show abstract

“…Aerosols are emitted into the Earth's atmosphere from various natural and anthropogenic sources. Aerosols from these heterogeneous sources are transported by wind and are distributed across the globe, depending on the prevailing meteorological conditions (Tanner and Law, ; Cheng et al ., ; Zhao et al ., ; Kaskaoutis et al ., ). The spatial distribution of atmospheric aerosols is important information required to assess their impact on the environment, which in turn necessitates a timely estimate of aerosol sources.…”

Section: Introductionmentioning

confidence: 97%

Satellite‐based top‐down Lagrangian approach to quantify aerosol emissions over California

Nizar

Dodamani

2020

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

Accurate forecasting of air quality demands better estimates of aerosol emissions. The accuracy of conventional bottom‐up approaches to estimate aerosol emissions depends on the degree to which various influencing parameters are estimated. The availability of satellite observations not only enhances the capability of determining various influencing parameters, but also provides alternate ways of assessing aerosol sources. The present study employs a Lagrangian approach to the Advection Diffusion Equation (ADE) to estimate the transported aerosols and hence the Aerosol Source Strength (ASS) using satellite‐measured Aerosol Optical Depth (AOD) and reanalysis wind data. This top‐down approach is based on the advection and diffusion of atmospheric aerosols considering wind circulation and atmospheric conditions rather than using indicative parameters. ASS was computed every 3 hr at a 0.25°×0.25° grid across California during July 2018. For the computation, AOD retrievals were obtained from the Geostationary Operational Environmental Satellite (GOES)‐16 with observations every 15 min. The data were resampled to the grid every 3 hr, and backward trajectories were run at every gridpoint to ascertain the initial aerosol concentration for the ADE. The final aerosol concentrations obtained from the ADE model were then compared with the observed AOD to obtain the ASS during that time period. The results are indicative of higher ASS around wildfire locations. The ASS values also show good correlation (R2=0.886) with Fire Radiative Power (FRP) obtained from Terra MODIS fire product. The method was further applied to investigate the spatial correlation of ASS with power plant density, which reveals a steady increase in ASS with power plant density (R2=0.82).

show abstract

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

Cited by 35 publications

References 83 publications

Monthly and seasonal variability of dust events over northern Saudi Arabia

Monthly and seasonal variability of dust events over northern Saudi Arabia

The variability of the Siberian high ridge over the Middle East

Satellite‐based top‐down Lagrangian approach to quantify aerosol emissions over California

Contact Info

Product

Resources

About