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Chemical Characteristics and Deposition of Aerosols in the Cheju-Korea Straits

제주-대한해협 해역에서 에어로졸의 화학적 특성과 침적

  • Suk Hyun, Kim (Marine Environmental Research Center, Marine Environmental & Climate Research Division, Korea Institute of Ocean Science & Technology) ;
  • Hyunmi, Lee (Marine Environmental Research Center, Marine Environmental & Climate Research Division, Korea Institute of Ocean Science & Technology) ;
  • Deok-Soo, Moon (Seawater Energy Plant Research Center, Marine Renewable Energy Research Division, Korea Research Institute of Ships & Ocean Engineering)
  • 김석현 (한국해양과학기술원 해양환경.기후연구본부 해양환경연구센터) ;
  • 이현미 (한국해양과학기술원 해양환경.기후연구본부 해양환경연구센터) ;
  • 문덕수 (한국해양과학기술원 부설 선박해양플랜트연구소 해양에너지연구본부 해수에너지연구센터)
  • Received : 2022.10.20
  • Accepted : 2022.12.07
  • Published : 2022.12.30

Abstract

To understand the chemical composition of aerosols in the Cheju-Korea Straits and their contribution to the ocean by deposition, aerosol samples were collected on board R/V Eardo from November 1997 to May 1999. The average concentrations of Al, NO3-, non-sea-salt (nss)-SO42-, and NH4+ in aerosols were 2.19, 5.59, 6.16 and 2.08 ㎍ m-3, respectively. The Al concentration in the high yellow dust period was about 100 times higher than that in the non-yellow dust period. The concentration ratio of NO3-/nss-SO42- ranged between 0.47 and 1.5, indicating that the aerosols in the Cheju-Korea Straits are under the effects of NOx and SOx emitted from China, Korea and Japan. The equivalent concentration ratio of [NH4+]/[nss-SO42-+ NO3-] with the average of 0.58±0.29 indicates that nss-SO42- and NO3- are not neutralized by NH4+. A high activity concentration of 210Pb with 1.13-1.23 mBq m-3 was observed during the high yellow dust period, indicating that 210Pb is easily adsorbed in the yellow dust originating from the continent of Asia. The distribution of 7Be and NH4+ concentrations showed a strong negative linear correlation during the low yellow dust period, April 1998. The total mineral dust flux in the Cheju-Korea Straits was estimated to be 1.21×106 tons yr-1, accounting for about 12% of the annual sediment discharge via the Nakdong River. The combined annual deposition of NH4+ and NO3- was 0.103 mole N m-2 yr-1 was estimated to support 4% of the annual primary productivity in the East China Sea.

Keywords

Acknowledgement

이 논문은 한국해양과학기술원의 지원을 받아 수행된 과제(PE99725)에서 획득된 자료를 사용하였습니다.

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