필리핀해에 운반되는 황사의 기원지와 이동 경로 : 동위원소 및 점토광물 조성 연구

Title
필리핀해에 운반되는 황사의 기원지와 이동 경로 : 동위원소 및 점토광물 조성 연구
Alternative Title
Provenance and Transport Pathways of Asian Dust Delivered to the Philippine Sea: Isotopic and Clay Mineralogical Evidence
Author(s)
서인아; 이용일; 형기성; 유찬민; 김형직
KIOST Author(s)
Hyeong, Kiseong(형기성)Yoo, Chan Min(유찬민)Kim, Hyung Jeek(김형직)
Publication Year
2014-11-18
Abstract
Provenance and transport pathways of dust to the tropical-subtropical northwestern Pacific were investigated with clay mineral assemblage and radiogenic isotope (143Nd/144Nd and 87Sr/86Sr) compositions of eolian dust preserved in a deep-sea sediment core (12°30′N, 134°60′E) retrieved from the Palau-Kyushu Ridge in the Philippine Sea. The analytical results revealed the influence of two prevailing dust sources, namely, the Asian deserts and nearby volcanic arcs, with average contribution of ~70% and ~30%, respectively. The clay mineral composition of the core resembled dust from the central Asian deserts (CADs e.g., the Taklimakan Desert) as in the North Central Pacific, but referring to the previously published data, the aerosol collected near the study site during winter/spring has the mineralogical signature of dust originating from the East Asian deserts (EADs). These data indicate that the relative contribution of EAD dust increases with the northeasterly surface winds associated with the East Asian Winter Monsoon (EAWM) during winter/spring, but the Prevailing Westerlies and Trade Winds that carry dust from the CADs is the dominant transport agent in the overall dust budget of the study site. The results of this study contradict the prevailing view that direct dust transport by the EAWM winds in spring dominates the annual flux of eolian dust in the northwest Pacific. sediment core (12°30′N, 134°60′E) retrieved from the Palau-Kyushu Ridge in the Philippine Sea. The analytical results revealed the influence of two prevailing dust sources, namely, the Asian deserts and nearby volcanic arcs, with average contribution of ~70% and ~30%, respectively. The clay mineral composition of the core resembled dust from the central Asian deserts (CADs e.g., the Taklimakan Desert) as in the North Central Pacific, but referring to the previously published data, the aerosol collected near the study site during winter/spring has the mineralogical signature of dust originating from the East Asian deserts (EADs). These data indicate that the relative contribution of EAD dust increases with the northeasterly surface winds associated with the East Asian Winter Monsoon (EAWM) during winter/spring, but the Prevailing Westerlies and Trade Winds that carry dust from the CADs is the dominant transport agent in the overall dust budget of the study site. The results of this study contradict the prevailing view that direct dust transport by the EAWM winds in spring dominates the annual flux of eolian dust in the northwest Pacific.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25744
Bibliographic Citation
추계지질과학연합학술대회, pp.137, 2014
Publisher
대한지질학회
Type
Conference
Language
English
Publisher
대한지질학회
Related Researcher
Research Interests

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

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse