Influence of ENSO variability on sinking-particle fluxes in the northeastern equatorial Pacific SCIE SCOPUS

Cited 14 time in WEB OF SCIENCE Cited 17 time in Scopus
Title
Influence of ENSO variability on sinking-particle fluxes in the northeastern equatorial Pacific
Author(s)
Kim, Hyung Jeek; Kim, Dongseon; Yoo, Chan Min; Chi, Sang-Bum; Khim, Boo Keun; Shin, Hong-Ryeol; Hyeong, Kiseong
KIOST Author(s)
Kim, Hyung Jeek(김형직)Kim, Dong Seon(김동선)Yoo, Chan Min(유찬민)Chi, Sang Bum(지상범)Hyeong, Ki Seong(형기성)
Publication Year
2011-08
Abstract
A time-series sediment trap was operated from July 2003 to July 2008 at a station located in the 10 degrees N thermocline ridge of the northeastern equatorial Pacific (10 degrees 30'N, 131 degrees 20W), with the aim of understanding variations in natural background sinking-particle flux and the influence on such fluxes of ENSO (El Nino-Southern Oscillation). Each one of weak El Nino, moderate El Nino and moderate La Nina were observed during the monitoring period. During non-ENSO periods, total mass fluxes varied from 4.1 to 36.9 mg m(-2) d(-1), with a distinct seasonal variation, ranging from an average flux of 14.0 mg m(-2) d(-1) in the warm season (June-November) to 25.3 mg m(-2) d(-1) in the cold season (December-May). This seasonal fluctuation was characterized by a distinct difference in CaCO3 flux between the two seasons. The enhanced particle fluxes during the cold season are attributed to the supply of nutrient-enriched subsurface water by wind-driven vertical mixing, supported by a simultaneous reduction in sea surface temperature and enhanced trade winds. The weak El Nino event occurred in the monitoring period had no recognizable effect on particle fluxes in the study area, but the moderate El Nino event was accompanied by a significant reduction in particle fluxes to 60% of the average background value in the warm season. In contrast, particle fluxes during the moderate La Nina increased to a maximum value of 129.9 mg m(-2) d(-1), almost three times the average background value. Organic carbon and biogenic silica fluxes were most sensitive to the El Nino and La Nina conditions. The observed variations of particle fluxes are synchronized with those of chlorophyll-a, suggesting primary productivity for the main cause of flux change. The present data indicate that marked seasonal variability in background fluxes commonly exceeds the variability associated with ENSO and post-ENSO signals, which should be taken into account when evaluating the influence of ENSO on sinking particle fluxes in the 10 degrees N thermocline ridge area. (C) 2011 Elsevier Ltd. All rights reserved.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3838
DOI
10.1016/j.dsr.2011.06.007
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.58, no.8, pp.865 - 874, 2011
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
EASTERN TROPICAL PACIFIC; EL-NINO; INTERANNUAL VARIABILITY; NORTH PACIFIC; SEASONAL-VARIATIONS; EXPORT FLUXES; OCEAN; WESTERN; CARBON; ZOOPLANKTON
Keywords
Time-series sediment trap; Particle flux; Seasonal variation; El Nino; La Nina
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

deep sea mineral resources,deep sea sediments,심해저 광물자원,심해저 퇴적물,심해 환경

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