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

D. G. Kaskaoutis, E. E. Houssos, A. Rashki, P. Francois, M. Legrand, D. Goto, A. Bartzokas, H. D. Kambezidis, Toshihiko Takemura

    Research output: Contribution to journalArticle

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    Abstract

    This work investigates the modulation in dust activity over southwest (SW) Asia attributed to changes in the mean sea level pressure (MSLP) between the Caspian Sea (CS) and Hindu Kush (HK) during the summer months (June-July-August-September, JJAS) of the period 2000-2014. The MSLP anomalies obtained via NCEP/NCAR re-analysis are evaluated via a new climatology index, the Caspian Sea-Hindu Kush Index (CasHKI), which is defined as CasHKI=MSLPanom.CS-MSLPanom.HK, over specific domains taken over the CS and HK. The changes in CasHKI intensity are examined against dust activity and rainfall distributions over south Asia. The satellite remote sensing (Meteosat, OMI, MODIS) analyses show that high CasHKI values corresponding to enhanced pressure gradient between the CS and the HK, are associated with intensification of northerly winds, increased dust emissions and transportation over SW Asia and north Arabian Sea. In contrast, variations in CasHKI intensity do not seem to have a significant effect on the Indian summer monsoon. Only a slight decrease of precipitation over the southern Indian peninsula and the neighboring oceanic areas and an increase of precipitation along the Ganges Basin and Himalayan range are found to be related to high CasHKI values. Model (MIROC-SPRINTARS) simulations of dust concentration and dust AOD (Aerosol Optical Depth) over SW Asia are consistent with the satellite observations, highlighting for the first time the modulation of the SW Asian dust activity by CasHKI.

    Original languageEnglish
    Pages (from-to)10-23
    Number of pages14
    JournalGlobal and Planetary Change
    Volume137
    DOIs
    Publication statusPublished - Feb 1 2016

    Fingerprint

    dust
    sea level pressure
    Asia
    Caspian Sea
    index
    Meteosat
    summer
    pressure gradient
    optical depth
    MODIS
    climatology
    monsoon
    aerosol
    remote sensing
    anomaly
    rainfall
    basin
    simulation

    All Science Journal Classification (ASJC) codes

    • Global and Planetary Change
    • Oceanography

    Cite this

    The Caspian Sea-Hindu Kush Index (CasHKI) : A regulatory factor for dust activity over southwest Asia. / Kaskaoutis, D. G.; Houssos, E. E.; Rashki, A.; Francois, P.; Legrand, M.; Goto, D.; Bartzokas, A.; Kambezidis, H. D.; Takemura, Toshihiko.

    In: Global and Planetary Change, Vol. 137, 01.02.2016, p. 10-23.

    Research output: Contribution to journalArticle

    Kaskaoutis, DG, Houssos, EE, Rashki, A, Francois, P, Legrand, M, Goto, D, Bartzokas, A, Kambezidis, HD & Takemura, T 2016, 'The Caspian Sea-Hindu Kush Index (CasHKI): A regulatory factor for dust activity over southwest Asia', Global and Planetary Change, vol. 137, pp. 10-23. https://doi.org/10.1016/j.gloplacha.2015.12.011
    Kaskaoutis, D. G. ; Houssos, E. E. ; Rashki, A. ; Francois, P. ; Legrand, M. ; Goto, D. ; Bartzokas, A. ; Kambezidis, H. D. ; Takemura, Toshihiko. / The Caspian Sea-Hindu Kush Index (CasHKI) : A regulatory factor for dust activity over southwest Asia. In: Global and Planetary Change. 2016 ; Vol. 137. pp. 10-23.
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    AU - Rashki, A.

    AU - Francois, P.

    AU - Legrand, M.

    AU - Goto, D.

    AU - Bartzokas, A.

    AU - Kambezidis, H. D.

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    AB - This work investigates the modulation in dust activity over southwest (SW) Asia attributed to changes in the mean sea level pressure (MSLP) between the Caspian Sea (CS) and Hindu Kush (HK) during the summer months (June-July-August-September, JJAS) of the period 2000-2014. The MSLP anomalies obtained via NCEP/NCAR re-analysis are evaluated via a new climatology index, the Caspian Sea-Hindu Kush Index (CasHKI), which is defined as CasHKI=MSLPanom.CS-MSLPanom.HK, over specific domains taken over the CS and HK. The changes in CasHKI intensity are examined against dust activity and rainfall distributions over south Asia. The satellite remote sensing (Meteosat, OMI, MODIS) analyses show that high CasHKI values corresponding to enhanced pressure gradient between the CS and the HK, are associated with intensification of northerly winds, increased dust emissions and transportation over SW Asia and north Arabian Sea. In contrast, variations in CasHKI intensity do not seem to have a significant effect on the Indian summer monsoon. Only a slight decrease of precipitation over the southern Indian peninsula and the neighboring oceanic areas and an increase of precipitation along the Ganges Basin and Himalayan range are found to be related to high CasHKI values. Model (MIROC-SPRINTARS) simulations of dust concentration and dust AOD (Aerosol Optical Depth) over SW Asia are consistent with the satellite observations, highlighting for the first time the modulation of the SW Asian dust activity by CasHKI.

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