Seasonal variation of planktonic foraminifera assemblage in response to seasonal shift of inter-tropical convergence zone in the northeastern equatorial pacific SCOPUS KCI

Title
Seasonal variation of planktonic foraminifera assemblage in response to seasonal shift of inter-tropical convergence zone in the northeastern equatorial pacific
Author(s)
Lee, Y.; Asahi, H.; Woo, H.J.; Kim, H.J.; Lee, S.-J.; Khim, B.-K.
KIOST Author(s)
Woo, Han Jun(우한준)Kim, Hyung Jeek(김형직)
Publication Year
2014
Abstract
A time-series sediment trap was operated at a water depth of 4950 m from July 2003 to May 2004 at KOMO station (10o30'N, 131o20'W) in the northeastern equatorial Pacific, with the aim of understanding the temporal variation of planktonic foraminifera assemblages in response to the seasonal shift of Inter-Tropical Convergence Zone (ITCZ). A total of 22130 planktonic foraminifera specimens belonging to 30 species and 11 genera were identified, which shows a distinct seasonal variation with high values (125~288 specimens m-2 day-1) in the winter to spring (December-May) and low values (16 ~ 23 specimens m-2 day-1) in the fall (September-November). In addition, seasonal ecological differences of foraminifera assemblages are distinctly recognizable: omnivorous foraminifera occurred predominantly. during the summer season, whereas herbivorous ones were dominant during the winter season. Such seasonal variations correspond to the seasonal shift of the ITCZ. Enhanced occurrence of herbivorous species during the winter-spring season seems a result of surface water mixing generated by the southward shift of the ITCZ. The increase in omnivorous species during the summer season may be due to the northward movement of the ITCZ caused by weakened wind speed, resulting in the intensification of water column stratification and nutrient-poor environment. A significant reduction of planktonic foraminifera specimens during the fall is attributed to heavy precipitation and reduction in light intensity. © 2014, Korea Ocean Research and Development Institute. All rights reserved.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2935
DOI
10.4217/OPR.2014.36.4.437
Bibliographic Citation
Ocean and Polar Research, v.36, no.4, pp.437 - 445, 2014
Publisher
Korea Ocean Research and Development Institute
Subject
intertropical convergence zone; light intensity; mixing; planktonic foraminifera; precipitation (climatology); seasonal variation; sediment trap; temporal variation; time series analysis; water column; wind velocity; Pacific Ocean; Pacific Ocean (Equatorial); Foraminifera
Keywords
ITCZ; Northeastern equatorial Pacific; Planktonic foraminifera; Seasonal variation
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

Particle flux,Carbon cycle,Climate Change,입자 플럭스,탄소순환,기후변화

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