TY - JOUR T1 - Annual Mean Total Precipitation Reconstruction of the Elmacık Mountain and Its Surroundings for 1858-2015 Using Scotch Pine Tree Rings TT - Sarıçam Yıllık Halkaları Kullanılarak Elmacık Dağı ve Yakın Çevresinin 1858-2015 Dönemi Yıllık Toplam Yağış Rekonstrüksiyonu AU - İrdem, Cemil AU - Coşkun, Mücahit PY - 2024 DA - January DO - 10.26650/JGEOG2023-1263882 JF - Journal of Geography PB - Istanbul University WT - DergiPark SN - 1305-2128 SP - 109 EP - 121 IS - 47 LA - en AB - The present study aims to use dendrochronological methods to reconstruct the precipitation history of Elmacık Mountain of Northwest Türkiye and its immediate surroundings. This research is the first dendroclimatological study in Türkiye regarding total annual precipitation reconstruction in the current literature. The study created three Scotch pine (Pinus sylvestris L. ssp. hamata) site chronologies (214-, 233-, and 248-year spans) using samples from Elmacık Mountain before combining the site chronologies into one regional chronology. The study calculated relations between this regional chronology and the total annual precipitation data of the Bolu, Düzce, and Sakarya meteorological stations using Pearson’s correlation coefficient. As the results are statistically suitable for reconstructing the total annual precipitation data in Bolu and Düzce, the total rainfall reconstruction of these stations was carried out over a 158 year span from 1858-2015. Low- and high-precipitation years were also revealed for 1858-1950 when the stations were not in operation. Accordingly, the years in which the annual total precipitation was at least one standard deviation unit below the average for both stations were 1860-1861, 1875, 1878, 1887, 1893, 1904-1905, 1907, 1909, 1935, 1942, 1945, and 1949. Meanwhile, 1865, 1873, 1877, 1885, 1910, 1912-1914, 1917, 1919, 1922, 1939-1940 were the years when the total annual rainfall was at least one standard deviation unit above the average. In 1901 and 1936, total annual rainfall was two standard deviations above average. KW - Dendrochronology KW - precipitation KW - Scotch pine N2 - Bu çalışma, Türkiye’nin kuzeybatısında yer alan Elmacık Dağı ve yakın çevresi için dendrokronolojik yöntemlerle yağışın geriye dönük yapılandırılımasını amaçlamaktadır. Bu çalışma, yapılan literatür taramasına göre yıllık toplam yağış rekonstrüksiyonu açısından Türkiye’de ilk dendroklimatolojik çalışmadır. Çalışmada Elmacık Dağı’ndan örneklerle 3 sarıçam (Pinus sylvestris L. ssp. hamata) yöre kronolojisi (214, 233 ve 248 yıllık) oluşturulmuştur. Ardından yöre kronolojileri birleştirilerek bir bölgesel kronolojiye dönüştürülmüştür. Bu bölgesel kronoloji ile Bolu, Düzce ve Sakarya meteoroloji istasyonlarının yıllık toplam yağış verileri arasındaki ilişkiler Pearson korelasyon katsayısı yöntemi kullanılarak hesaplanmıştır. Sonuçlar Bolu ve Düzce yıllık toplam yağış verileri için istatistik açıdan rekonstrüksiyon yapmaya uygun bulunduğundan, bu istasyonların yıllık toplam yağışlarının 158 yıllık (MS 1858-1915) geriye dönük tahmini yapılmış, aletsel dönem öncesi (1858-1950) az yağışlı ve yağışlı yıllar belirlenmiştir. Buna göre 1860-1861, 1875, 1878, 1887, 1893, 1904-1905, 1907, 1909, 1935, 1942, 1945 ve 1949 yılları ortalamadan en az bir standart sapma az yağışlı; 1865, 1873, 1877, 1885, 1910, 1912-1914, 1917, 1919, 1922 ve 1939- 1940 yılları ortalamadan en az bir standart sapma çok yağışlı yıllar olarak belirlenmiştir. 1901 ve 1936 yıllarında yıllık toplam yağış, ortalamanın en az 2 standart sapma üzerindedir. CR - Akkemik, Ü. 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