Physical and biological control of aragonite saturation in the coastal waters of southern South Korea under the influence of freshwater

Dongseon Kim, Geun Ha Park, Seung Ho Baek, Yujeong Choi, Tae-Wook Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigated the aragonite saturation state (Ω arag ) during all four seasons in a coastal region of southern Korea that receives considerable freshwater input. The surface Ω arag values were higher during productive seasons with enhanced freshwater influences, likely due to an increased net removal of dissolved inorganic carbon (DIC) from the water column (i.e., biological control). In addition, during the productive seasons, enhancement of Ω arag was observed with decreasing salinity within a linear mixing zone present between river-influenced surface and saltier bottom waters. DIC appeared to be effectively sequestered from the warmer, less salty surface water by downward flux of organic matter, but not significantly affected by the relatively DIC-rich, cooler and saltier bottom waters under strong stratification conditions during these seasons (i.e., physical control). Low phytoplankton productivity and seasonal breakdown of the stratification caused reduced saturation in other seasons and made the study area a weak sink for atmospheric CO 2 .

Original languageEnglish
Pages (from-to)318-328
Number of pages11
JournalMarine Pollution Bulletin
Volume129
Issue number1
DOIs
Publication statusPublished - 2018 Apr 1

Fingerprint

physical control
South Korea
aragonite
biological control
coastal water
saturation
dissolved inorganic carbon
Carbon
Water
Phytoplankton
bottom water
carbon
Surface waters
stratification
Biological materials
Productivity
Rivers
freshwater input
Fluxes
coolers

Keywords

  • Aragonite saturation
  • Busan coast
  • Freshwater input
  • Nakdong River
  • Ocean acidification

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution

Cite this

Physical and biological control of aragonite saturation in the coastal waters of southern South Korea under the influence of freshwater. / Kim, Dongseon; Park, Geun Ha; Baek, Seung Ho; Choi, Yujeong; Kim, Tae-Wook.

In: Marine Pollution Bulletin, Vol. 129, No. 1, 01.04.2018, p. 318-328.

Research output: Contribution to journalArticle

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AB - We investigated the aragonite saturation state (Ω arag ) during all four seasons in a coastal region of southern Korea that receives considerable freshwater input. The surface Ω arag values were higher during productive seasons with enhanced freshwater influences, likely due to an increased net removal of dissolved inorganic carbon (DIC) from the water column (i.e., biological control). In addition, during the productive seasons, enhancement of Ω arag was observed with decreasing salinity within a linear mixing zone present between river-influenced surface and saltier bottom waters. DIC appeared to be effectively sequestered from the warmer, less salty surface water by downward flux of organic matter, but not significantly affected by the relatively DIC-rich, cooler and saltier bottom waters under strong stratification conditions during these seasons (i.e., physical control). Low phytoplankton productivity and seasonal breakdown of the stratification caused reduced saturation in other seasons and made the study area a weak sink for atmospheric CO 2 .

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