Assessing the Influence of the Scandinavian Teleconnection Pattern on Precipitation and Relative Humidity Across Climatically Diverse Regions of Iran

Abstract

The Earth system comprises several interlinked spheres—namely the atmosphere, lithosphere, biosphere, hydrosphere, and cryosphere—each of which plays an integral role in the generation of diverse meteorological and climatological phenomena, including but not limited to precipitation, snowfall, droughts, pluvial, and other events. Among the pivotal elements modulating such interactions are teleconnection indices, which encapsulate large-scale climate variability across different geographical domains. One such index, the Scandinavian Pattern, constitutes the focal point of the present investigation.

This study employs a multivariate analytical framework to assess the simultaneous influence of the SCAND index on 2 primary climatic parameters—precipitation and relative humidity—across 21 synoptic weather stations distributed throughout various climatic zones of Iran. A (P.C.A) was conducted to discern the relative magnitude of teleconnection impacts on each parameter, highlighting the spatial heterogeneity of SCAND-related influences.

The highest positive correlations were observed in Rasht for precipitation (r = 0.40) and in Kerman for relative humidity (r = 0.47). In contrast, the stations located in Tabriz and Yazd exhibited statistically insignificant correlations with the SCAND index in terms of humidity. Furthermore, the influence of the polar front jet stream—amplified by the passage of Rossby waves—was found to be more pronounced across the northern synoptic stations, underscoring the significance of the SCAND pattern in modulating upper-level circulation dynamics.

Given the increasing urgency posed by anthropogenic climate change, it is imperative that future investigations incorporate projected climate scenarios to consider for their behavior.



Keywords

Scandinavian Islands, Climatic Parameter, Celsius