Temporal Structure and Episode Characteristics of Atmospheric Stagnation in Balıkesir (2000–2024)

Öz

Atmospheric stagnation is a meteorological phenomenon characterized by low wind speeds and weak atmospheric dispersion conditions, promoting air pollutant accumulation and influencing local climate processes. This study investigates the long-term characteristics of atmospheric stagnation over Balıkesir in the South Marmara Region of Türkiye using hourly meteorological observations for 2000–2024. Atmospheric stagnation was identified using a wind speed threshold-based approach at hourly, daily, and episode scales, without applying any gap-filling procedure. Stagnation episodes were defined as periods lasting at least one day and consisting of consecutive stagnation days. Stagnation hours, stagnation days, and multi-day stagnation episodes were identified, and their temporal trends were evaluated using the non-parametric Mann–Kendall test and Sen's slope estimator. In addition, the diurnal variation of stagnation conditions was examined. Approximately 48% of the valid hourly observations and 45% of the analyzed days were classified as stagnation conditions. No statistically significant long-term trends were detected in annual stagnation hours or stagnation days, whereas stagnation episode frequency showed a significant increasing trend. No significant trend was observed in episode duration. Diurnal analysis indicated that stagnation conditions occurred predominantly during nighttime and early morning hours. These findings suggest that the temporal structure and organization of atmospheric stagnation have changed over time, despite little variation in its overall duration.

Anahtar Kelimeler

• Atmospheric stagnation
• Temporal structure
• Stagnation episodes
• Wind speed
• Balıkesir

Destekleyen Kurum

We would like to express our sincere gratitude to the Scientific Research Projects Unit of Balıkesir University for their valuable contributions to the realization of this study.

Proje Numarası

Balıkesir Üniversitesi Bilimsel Araştırma Projeleri Birimi. Proje No: 2025/146

Etik Beyan

Ethical approval is not required for this study.

Teşekkür

We would also like to thank the Balıkesir Regional Directorate of Meteorology for their valuable collaboration and contributions to the completion of this study.

BALIKESİR’DE ATMOSFERİK DURGUNLUĞUN ZAMANSAL YAPISI VE EPİZOT ÖZELLİKLERİ (2000–2024)

Öz

Atmosferik durgunluk, düşük rüzgâr hızları ve zayıf atmosferik dağılım koşulları ile karakterize edilen, hava kirliliği birikimi ve yerel iklim süreçleri üzerinde önemli etkilere sahip bir meteorolojik olgudur. Bu çalışmada, Türkiye’nin Güney Marmara Bölgesi’nde yer alan Balıkesir ili için 2000–2024 dönemini kapsayan saatlik meteorolojik gözlemler kullanılarak atmosferik durgunluk koşullarının uzun dönemli özellikleri incelenmiştir. Atmosferik durgunluk, rüzgâr hızı temelli bir eşik yaklaşımı kullanılarak saatlik, günlük ve epizot ölçeklerinde tanımlanmış; analizler herhangi bir veri doldurma işlemi uygulanmadan gerçekleştirilmiştir. Durgunluk epizotları, en az bir gün süreyle devam eden ve ardışık durgun günlerin birleşimi olarak tanımlanmıştır. Durgun saatler, durgun günler ve çok günlük durgunluk epizotları belirlenmiş; bu göstergelerin zamansal eğilimleri parametrik olmayan Mann–Kendall testi ve Sen’in eğim kestiricisi ile değerlendirilmiştir. Ayrıca, durgunluk koşullarının gün içindeki dağılımı analiz edilmiştir. Sonuçlar, Balıkesir’de geçerli saatlerin yaklaşık %48’inin durgun saat, günlerin ise yaklaşık %45’inin durgun gün olarak sınıflandırıldığını göstermektedir. Yıllık toplam durgun saat ve durgun gün sayılarında anlamlı bir uzun dönemli eğilim tespit edilmezken, durgunluk epizotlarının sayısında istatistiksel olarak anlamlı bir artış belirlenmiştir. Epizot sürelerinde ise anlamlı bir değişim gözlenmemiştir. Gün içi analizler, durgunluk koşullarının gece ve erken sabah saatlerinde yoğunlaştığını ortaya koymaktadır. Bu bulgular, atmosferik durgunluğun toplam süresinden ziyade zamansal yapısında ve organizasyonunda değişimler yaşandığını göstermektedir.

Anahtar Kelimeler

• Atmosferik durgunluk
• Zamansal yapı
• Durgunluk epizotları
• Rüzgâr hızı
• Balıkesir

Destekleyen Kurum

Bu çalışmanın gerçekleşmesinde değerli katkılarından dolayı Balıkesir Üniversitesi Bilimsel Araştırma Projeleri Birimine teşekkürlerimizi sunarız.

Proje Numarası

Balıkesir Üniversitesi Bilimsel Araştırma Projeleri Birimi. Proje No: 2025/146

Etik Beyan

Bu çalışma için etik kurul onayına gerek yoktur.

Teşekkür

Bu çalışmanın gerçekleşmesinde değerli işbirliği ve katkılarından dolayı Balıkesir İl Meteoroloji Bölge müdürülüğüne teşekkürlerimzi sunarız.

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