CHEN LiFan,
SUN ChengHu,
ZHANG DongBin et al
.2019.Bias correction and the dataset development of sea surface temperature over the Indian-Pacific Ocean from 1901 to 2016 Chinese Journal of Geophysics(in Chinese),62(6): 2001-2015,doi: 10.6038/cjg2019M0141
Bias correction and the dataset development of sea surface temperature over the Indian-Pacific Ocean from 1901 to 2016
CHEN LiFan1, SUN ChengHu1, ZHANG DongBin1, CAO LiJuan1, LI WeiJing2,3
1. National Meteorological Information Center, Beijing 100081, China;
2. National Climate Center, Beijing 100081, China;
3. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China
Bias correction of the systematic observation error is vital for the development of long-term gridded sea surface temperature (SST) dataset since 1900. In this study, based on the optimized SR02 bias correction method and the global hourly ocean surface observation dataset from National Meteorological Information Center, we have developed the monthly bias-corrected SSTA dataset over the Indian-Pacific Ocean from 1901 to 2016, with a spatial resolution of 2°×2°. The results show that the spatial-temporal distribution of the SST bias derived from our newly developed dataset is generally consistent with the history of SST observation techniques, and also indeed reflects the seasonal variation of SST systematic observation errors. As the threshold of the optimized method varies with the space sample sizes, the bias derived from it reflects more local characteristics, and changes more consistently with transformation of observation techniques as compared with the bias features of ERSST V4. Both the mean bias and root-mean-square error (RMSE) of the bias-corrected SSTA compared with ERSSTv5 are smaller than the original one, with varying of reduced mean bias from 37.7% to 87.9%, and decreasing RMSE around 0.06℃. In addition, the comparisons with international products (i.e., ERSST V5, HadSST3, HadISST1 and COBE2) demonstrate that our newly developed bias-corrected SSTA dataset shares high correlations over 0.97 with those, and comparable trend features. Except for the coastal region of the East Asia in the higher latitudes, the general differences between our newly developed bias-corrected SSTA dataset and the other international products are mainly between -0.2~0.2℃.
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