Abstract
This paper includes a study which applied homogeneity and trend tests on time series of monthly mean temperature and monthly total rainfall recorded in the provinces of Bartın, Bolu, Düzce, Kastamonu, Sinop, and Zonguldak of western Black Sea region in Turkey. The Runs test was used to check the homogeneity of both variables. Analyses were made using Mann-Kendall (MK) trend test, Şen trend test, and linear trend test for the time period 1960–2017. According to the results of all tests, although monthly total rainfall of Bartın, Kastomonu, Sinop, and Zonguldak stations has inhomogeneous time series, Bolu and Düzce have homogeneous time series. The monthly mean temperature of all stations has no homogeneity. Although Kastamonu and Sinop have statistically significant increasing trends according to the linear trend test, other provinces have no statistically significant trends for both variables. There are no statistically significant trends for both variables in all stations according to the MK trend test; however, there are statistically significant increasing trends for monthly mean temperature in all stations according to the Şen trend test. Monthly total rainfall of Düzce (17072) has a statistically significant decreasing trend at 95% confidence interval; other stations have statistically significant increasing trends according to the Şen trend test.
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The author sincerely thanks the personnel of the General Directorate of Meteorology (GDM) in Turkey, and he is also grateful to referees and editor for valuable constructive comments.
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Ay, M. Trend and homogeneity analysis in temperature and rainfall series in western Black Sea region, Turkey. Theor Appl Climatol 139, 837–848 (2020). https://doi.org/10.1007/s00704-019-03066-6
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DOI: https://doi.org/10.1007/s00704-019-03066-6