부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.dsr.2014.05.002 Byline: Hyung Jeek Kim, Kiseong Hyeong, Jong-Yeon Park, Jin-Hyun Jeong, Dongchull Jeon, Eung Kim, Dongseon Kim Abstract: A time-series sediment trap was deployed from October 2007 to May 2011 in the western subtropical Pacific with the aim of understanding the seasonal and inter-annual variability on particle flux in response to El Nino-Southern Oscillation (ENSO) events. Total mass fluxes varied from 3.04mgm.sup.-2 day.sup.-1 to 31.1mgm.sup.-2 day.sup.-1, with high fluxes during February-April and low fluxes during other months. This seasonal variation was also characterized by a distinct change in the CaCO.sub.3 flux between the two periods. The marked increase in particle flux during February-April may be attributed to enhanced biological productivity in surface waters caused by strong wind-driven mixing in response to the western North Pacific monsoon system. The 2009/10 strong El Nino was accompanied by a significant reduction in particle flux, whereas the La Nina had no recognizable effect on particle flux in the subtropical Pacific. In particular, in the mature phase of the 2009/10 strong El Nino, the fluxes of organic carbon and biogenic silica decreased by 70-80% compared with those during the normal period, implying that the El Nino acted to suppress biological productivity in surface waters. The suppression of biological productivity during the 2009/10 strong El Nino is attributed to the decrease in precipitation due to the shift in the western Pacific warm pool. This finding is opposite that of other studies of the western equatorial Pacific, where El Nino events were observed to result in an increase in biological productivity and particle flux. The difference in particle flux between the western equatorial and subtropical Pacific is attributed to the regional differences in oceanic and atmospheric circulation systems generated by the strong El Nino. Author Affiliation: (a) Deep-sea and Seabed Resources Research Division, Korea Institute of Ocean Science & Technology, PO Box 29, Ansan 425-600, South Korea (b) Max Planck Institute for Meteorology, Hamburg 20146, Germany (c) Ocean Circulation and Climate Research Division, Korea Institute of Ocean Science & Technology, PO Box 29, Ansan 425-600, South Korea Article History: Received 7 February 2014; Revised 12 May 2014; Accepted 16 May 2014