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《海洋学报》 2016-03
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The detecting and adjusting of the sea surface temperature data homogeneity over coastal zone of circum Bohai Sea

Li Yan;Mu Lin;Wang Guosong;Fan Wenjing;Liu Kexiu;Li Huan;Zhang Zengjian;National Marine Data and Information Service;Key Lab of Global Change and Marine-Atmospheric Chemistry,State Oceanic Administration;  
Monthly Sea Surface Temperature(SST)data of 6coastal observation stations over coastal zone of circum Bohai Sea are chosen in the experimental homogeneity study.The work is expected to find a method to homogenize the monthly historical SST data in China.The coastal observation stations have the low density and it is hard to find homogeneous series for use as reference series.In light of the situation,two road maps are adopted to test the homogeneity of the SST series.Firstly,the penalized maximumFTest(PMFT)method which does not rely on reference series was chosen to detect change points.The resulting change points are then synthesized and verified by available metadata.Then,quantile-matching algorithm was used to adjust the SST series to diminish discontinuities.This method was suitable to the coastal observation stations with detailed metadata.However,for the coastal observation stations without enough metadata,penalized maximumTtest(PMT)which relies on reference series was used.Here,we use air surface temperature data series from nearly meteorological stations that are highly positively correlated with the base series to construct reference series.Testing results show that some inhomogeneities exist in the whole SST series in the region.Observational system change is found to be the main cause for discontinuities,followed by station relocation.It is found that the annual mean SST trend has changed obviously and homogeneity is improved well after adjustment.Results show that the warming rate of SST series after adjustment is larger than that before adjustment.In our study,a combination of the two different methods is proved to be necessary and possible,and it shows reasonability and application values in the homogeneity study of SST data in China.The results could provide a more reliable data set of homogenized in a longer period for the climate studies over offshore areas of China.
【Fund】: 国家自然科学基金项目(41106004;41376014);; 国家海洋局海洋-大气化学与全球变化重点实验室开放基金(GCMAC1402);国家海洋局公益性行业科研专项经费项目(201005019);; 国家科技支撑计划项目(2014BAB12B00);; 天津市科技计划项目(14ZCZDSF00012)
【CateGory Index】: P731.11;P714.1
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