Spring chlorophyll changes in relation with mixed layer variability in the East Sea (Japan Sea)

Title
Spring chlorophyll changes in relation with mixed layer variability in the East Sea (Japan Sea)
Author(s)
장찬주; 강현우; 소재귀; 유신재
KIOST Author(s)
Jang, Chan Joo(장찬주)Kang, Hyoun-Woo(강현우)So, Jae Kwi(소재귀)
Publication Year
2016-05-23
Abstract
Year-to-year variability of chlorouhyll-a (Chl-a) in the East Sea and its relation with mixed layer depth (MLD) changes are investigated by using Chl-a concentration data estimated from satellite (SeaWiFS and MODIS) measurement. MLD was calculated from 1/12° Global HYbrid Coordinate Ocean Model (HYCOM) for the period (2004− 2010). In 2008, spring CHL-a concentration in the Ulleung Basin reaches its maximum. This anomalous bloom can be attributed to relatively deep winter mixed layer that can entrain more nutrients into the upper ocean. Comparison of MLD with surface atmospheric forcing (wind and surface heat flux) suggests that the deep MLD was probably caused by a strong wind due to a strengthened Siberian high and Aleutian low, and the associated intensified surface cooling. On the other hand, spring CHL-a concentration in 2004 was not increased although the winter MLD was considerably deep. A deeper spring MLD in 2004 than normal years appears to contribute to an unfavorable light condition for spring bloom, thus resulting in the relatively low Chl-a concentration. Our finding suggests that, in addition to winter MLD, spring MLD also plays a crucial role in interannual variability of CHL-a in the East Sea. The low correlation between Asian dust and CHL-a concentrations suggest that Asian dusts did not likely influence on the 2008 spring bloom in the East Sea.culated from 1/12° Global HYbrid Coordinate Ocean Model (HYCOM) for the period (2004− 2010). In 2008, spring CHL-a concentration in the Ulleung Basin reaches its maximum. This anomalous bloom can be attributed to relatively deep winter mixed layer that can entrain more nutrients into the upper ocean. Comparison of MLD with surface atmospheric forcing (wind and surface heat flux) suggests that the deep MLD was probably caused by a strong wind due to a strengthened Siberian high and Aleutian low, and the associated intensified surface cooling. On the other hand, spring CHL-a concentration in 2004 was not increased although the winter MLD was considerably deep. A deeper spring MLD in 2004 than normal years appears to contribute to an unfavorable light condition for spring bloom, thus resulting in the relatively low Chl-a concentration. Our finding suggests that, in addition to winter MLD, spring MLD also plays a crucial role in interannual variability of CHL-a in the East Sea. The low correlation between Asian dust and CHL-a concentrations suggest that Asian dusts did not likely influence on the 2008 spring bloom in the East Sea.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24746
Bibliographic Citation
48th International Liege Colloguium on Ocean Dynamics, pp.1, 2016
Publisher
리에쥬대학
Type
Conference
Language
English
Publisher
리에쥬대학
Related Researcher
Research Interests

upper ocean dynamics,regional climate modeling,ocean climate change,해양상층역학,지역기후모델링,해양기후변화

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