An oceanic eddy statistical comparison using multiple observational data in the Kuroshio Extension region
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An oceanic eddy statistical comparison using multiple observational data in the Kuroshio Extension region JI Jinlin1, 2, 3, DONG Changming1, 3, 4, ZHANG Biao1, 2, 3*, LIU Yu1, 2, 3 1 School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China 2 Jiangsu Engineering Technology Research Center of Marine Environment Detection, Nanjing 210044, China 3 Oceanic Modeling and Observation Laboratory, Nanjing University of Information Science and Technology, Nanjing
210044, China 4 Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles 90095, USA
Received 3 February 2016; accepted 14 March 2016 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2017
Abstract
Eddy characteristics derived from different data resources are compared: sea surface temperature (SST), sea surface height anomaly (SSHA) and surface drifter trajectories. The comparison suggests that the eddy statistical characteristics are different using different variables to delineate eddies, but they show the similar trend. Based on the comparison, abnormal eddies with warm (cold) cores but counter-clockwise (clockwise) rotation are found in the Kuroshio Extension region. Key words: oceanic eddy, eddy characteristics, Kuroshio Extension region Citation: Ji Jinlin, Dong Changming, Zhang Biao, Liu Yu. 2017. An oceanic eddy statistical comparison using multiple observational data in the Kuroshio Extension region. Acta Oceanologica Sinica, 36(3): 1–7, doi: 10.1007/s13131-016-0882-1
1 Introduction Oceanic eddies have been found to play an indispensible role in marine biological and chemical processes (e.g., Vaillancourt et al., 2003; Johnson and McTaggart, 2010; Gruber et al., 2011), and the transport and distribution of heat, salt and energy (Stammer, 1998; Stammer et al., 2001; Roemmich and Gilson, 2001; Jia et al., 2005, 2011; Chen et al., 2012a, b; Volkov et al., 2008; Chelton et al., 2007, 2011; Wang et al., 2012; Bishop et al., 2013; Dong et al., 2014; Zhang et al., 2014). The Kuroshio Extension (KE) region, from Japan eastward to the mid-Pacific, is a band with large eddy kinetic energy (EKE) in the northern Pacific Ocean (Fig. 1) (Qiu and Chen, 2011; Liu et al., 2012; Zhang et al., 2013). Numerous coherent eddies have been detected using altimetry-measured sea surface height anomalies (SSHA) (Ichikawa and Imawaki, 1994; Itoh and Yasuda, 2010; Ji et al., 2016), satellite sea surface temperature (SST) data (Dong et al., 2011a), and drifter trajectories from the global drifter program (GDP) (Dong et al., 2011b). Itoh and Yasuda (2010) analyzed the characteristics of eddies detected using the SSHA from 1992 to 2008 in the KE region using the Okubo-Weiss (OW) method. Ji et al. ① employed an automated eddy detection scheme based on eddy geometry to collect eddies and investigate the eddy generation mechanisms in the region. Dong et al. (2011a) detected and analyzed eddies using 9 km SST data for the years 2006–2009, and found more anticyclon-
ic (cyclonic) eddies
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