Modelling Hourly Variability of Meteorological Parameters Using FPCA in the Western Himalayas: Evidence from Srinagar (1972–1989 & 1991–2024)

Modelling Hourly Variability of Meteorological Parameters Using FPCA in the Western Himalayas: Evidence from Srinagar (1972–1989 & 1991–2024) | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Modelling Hourly Variability of Meteorological Parameters Using FPCA in the Western Himalayas: Evidence from Srinagar (1972–1989 & 1991–2024) Preeti This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8377189/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract In this work, Functional Principal Component Analysis (FPCA), first time is applied to study the variability in meteorological parameters over Western Himalayan Region (Srinagar), particularly hourly rainfall, during the two wet seasons: winter (December-January-February, DJF) and the southwest monsoon (June-July-August-September, JJAS). The analysis covers two periods: 1972-1989 (Pre-1990, henceforth) and 1991-2024 (Post-1990, henceforth). The analysis revealed that the DJF rainfall between 1972 and 1990 (pre-1990) was primarily characterized by synoptic-scale circulation patterns and associated cloud bands. However, between 1991 and 2024 (post-1990), it became more closely tied to cloud type & its formation, as well as relative humidity dynamics (moisture fields), with a limited dependence on wind fields over the Srinagar region. The pre-1990 summer monsoon (JJAS) rainfall pattern is found to be convective cloud-driven. However, a temperature-driven convective instability, the primary mechanism, dominated the post-1990 monsoonal rainfall activity over Srinagar. FPCA3 reveals a significant change in the structural behavior of MSLP variability, although the post-1990 period is marked by diminished midday peaks & modified morning patterns. The analysis suggested that post-1990 temperature variability during JJAS occurred more frequently but tended toward the weaker anomalies, accompanied by notable adjustments in both the timing (FPCA2) and the form (FPCA3) of the diurnal temperature cycle. Overall, these findings imply that winter temperature variability after 1990 became more frequent, less balanced, and structurally more intricate. FPCA Western Himalaya (Srinagar) Autographic (hourly) meteorological data Climate Variability Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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