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Holocene salinity fluctuations of the E ast K orean lagoon related to sea level and precipitation changes
Author(s) -
Katsuki Kota,
Nakanishi Toshimichi,
Lim Jaesoo,
Nahm WookHyun
Publication year - 2017
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/iar.12214
Subject(s) - salinity , diatom , oceanography , precipitation , holocene , geology , sediment , geomorphology , geography , meteorology
Detailed diatom records within core sediments from M aeho L agoon along the E astern coast of S outh K orea revealed that the ecological dynamics of the lagoon during the H olocene were associated with relative sea level and regional precipitation. Accelerator mass spectrometry ( AMS ) 14 C dating indicates that sediment accumulation began prior to 8300 cal. year BP , and that the lagoon formed around 8000 cal. year BP . The salinity level of the lagoon increased until 5000 cal. year BP , and then decreased. Long‐term trends in salinity were dependent upon changes in sea level: periods of high salinity in the lagoon were generally coincident with periods of high sea levels along the east coasts of K orea and J apan. On the other hand, multicentennial‐scale fluctuations in diatom assemblages and magnetic susceptibility ( MS ) suggest that a 400 year fluctuation in salinity was regulated by changes in precipitation in the area of this lagoon. Changes in the westerly jet stream, controlled by variation in solar irradiance, had an important influence on precipitation volume in S outh K orea, suggesting that the patterns of the westerly jet stream fluctuate on a 400 year cycle.