Kokab Shahgholian

@utcan.ut.ac.ir

Department of irrigation and reclamation engineering



                    

https://researchid.co/nadiashahgholian

RESEARCH, TEACHING, or OTHER INTERESTS

Atmospheric Science, Earth and Planetary Sciences, Environmental Science, General Earth and Planetary Sciences

4

Scopus Publications

33

Scholar Citations

3

Scholar h-index

1

Scholar i10-index

Scopus Publications


  • Development of a Non-stationary Standardized Precipitation Evapotranspiration Index (NSPEI) for Drought Monitoring in a Changing Climate
    Javad Bazrafshan, Majid Cheraghalizadeh, and Kokab Shahgholian
    Springer Science and Business Media LLC

  • Introducing new climate indices for identifying wet/dry spells within an Madden-Julian Oscillation phase
    Mohammad Jafar Nazemosadat, Kokab Shahgholian, Habiballah Ghaedamini, and Elham Nazemosadat
    Wiley
    AbstractDaily values of precipitation in southwestern parts of Iran along with the corresponding Madden–Julian oscillation (MJO) phase are analysed to introduce some auxiliary indicators that can identify the wet and dry spells within a particular MJO phase. As a case study, the identification procedure focuses on phase 1 during the rainy season (Nov–Apr). The study shows that this phase contains two opposite spells, referred to as spells with pervasive precipitation (SWPP) and spells with widespread dryness (SWWD). Although the precipitation characteristics are essentially different between SWPP and SWWD, their associated MJO indices are found statistically identical. Therefore, the MJO–precipitation relationship fails to identify the wet/dry spells within an MJO phase. To resolve this deficiency, other climate indicators, which behave differently between these two spells, are introduced. The westward moisture flux over equatorial parts of the Indian Ocean and the northeastward moisture flux over the North African tropics are up to seven times stronger in the SWPP compared to SWWD. The dominance of a strong cyclonic (anticyclonic) circulation over the eastern side of the Mediterranean Sea and the negative (positive) west–east temperature gradient over southern parts of Iran are introduced as SWPP (SWWD) indicators. The study reveals that the SWPP (SWWD) coincides with a strong (weak) convection dipole that resembles the positive Indian Ocean dipole. The intensified (weakened) wind speed in the subtropical jet stream and persistence of the jet‐exit‐regions above Iran (Egypt and Saudi Arabia) are other SWPP (SWWD) indicators. Negative (positive) anomalies of sea surface temperature over the North Atlantic Ocean, the Black, Mediterranean, and Caspian Seas, as well as the Persian Gulf, signify the prevalence of the SWPP (SWWD). To the best of our knowledge, this is the first time that auxiliary indices are utilized to improve the MJO–precipitation relationship in southwestern Iran.


RECENT SCHOLAR PUBLICATIONS

  • Synoptic weather variables and data mining methods for predicting regional heavy precipitation over the southwest of Iran
    K Shahgholian, J Bazrafshan, P Irannejad
     2023

  • The wet and dry spells within the MJO-phase 8 and the role of ENSO and IOD on the modulation of these spells: A regional to continental-scales analysis
    MJ Nazemosadat, K Shahgholian, H Ghaedamini
    Atmospheric Research 285, 106631 2023

  • Development of a non-stationary standardized precipitation evapotranspiration index (NSPEI) for drought monitoring in a changing climate
    J Bazrafshan, M Cheraghalizadeh, K Shahgholian
    Water Resources Management 36 (10), 3523-3543 2022

  • Prediction of Regional Heavy Precipitation Occurrence in the Southwest Iran Using Synoptic Variables and Data Mining Methods
    K Shahgholian, J Bazrafshan, P Irannejad
    Iranian Journal of Soil and Water Research 53 (2), 317-332 2022

  • Introducing new climate indices for identifying wet/dry spells within an Madden‐Julian Oscillation phase
    MJ Nazemosadat, K Shahgholian, H Ghaedamini, E Nazemosadat
    International Journal of Climatology 41, E1686-E1699 2021

  • Heavy precipitation in the southwest of Iran: association with the Madden–Julian Oscillation and synoptic scale analysis
    M Jafar Nazemosadat, K Shahgholian
    Climate dynamics 49, 3091-3109 2017

  • A synoptic-scale analysis of the episodes with and without precipitation in the southwest of Iran during the phase 1 of the MJO
    MJ Nazemosadat, A ROSTAMPOUR, K Shahgholian
    IRANIAN JOURNAL OF GEOPHYSICS 10 (1), 73-87 2016

  • Formation of Heavy Precipitations in Southwestern Part of Iran and its Association with the Madden-Julian Oscillation
    MJ Nazemosadat, K Shahgholian
    Water and Soil 28 (5), 1072-1083 2015

  • The Wet and Dry Spells within the Mjo-Phase 8 and the Role of Enso and Iod on the Characteristics of These Spells: From Regional to Continental-Scales Analysis
    MJ Nazemosadat, K Shahgholian
    Available at SSRN 4188407

MOST CITED SCHOLAR PUBLICATIONS

  • Heavy precipitation in the southwest of Iran: association with the Madden–Julian Oscillation and synoptic scale analysis
    M Jafar Nazemosadat, K Shahgholian
    Climate dynamics 49, 3091-3109 2017
    Citations: 20

  • Development of a non-stationary standardized precipitation evapotranspiration index (NSPEI) for drought monitoring in a changing climate
    J Bazrafshan, M Cheraghalizadeh, K Shahgholian
    Water Resources Management 36 (10), 3523-3543 2022
    Citations: 5

  • Introducing new climate indices for identifying wet/dry spells within an Madden‐Julian Oscillation phase
    MJ Nazemosadat, K Shahgholian, H Ghaedamini, E Nazemosadat
    International Journal of Climatology 41, E1686-E1699 2021
    Citations: 5

  • The wet and dry spells within the MJO-phase 8 and the role of ENSO and IOD on the modulation of these spells: A regional to continental-scales analysis
    MJ Nazemosadat, K Shahgholian, H Ghaedamini
    Atmospheric Research 285, 106631 2023
    Citations: 2

  • Formation of Heavy Precipitations in Southwestern Part of Iran and its Association with the Madden-Julian Oscillation
    MJ Nazemosadat, K Shahgholian
    Water and Soil 28 (5), 1072-1083 2015
    Citations: 1