Chlorophyll interannual variability and its relation with mixed layer depth changes in the East Sea

Title
Chlorophyll interannual variability and its relation with mixed layer depth changes in the East Sea
Author(s)
장찬주; 유신재; 조영지
KIOST Author(s)
Jang, Chan Joo(장찬주)
Publication Year
2014-09-21
Abstract
We investigated year-to-year variability of chlorouhyll-a (Chl-a) in the East Sea and its relation with mixed layer depth (MLD) changes 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, CHL-a concentration in the Ulleung basin in April reaches a maximum during the period of 2004-2010. This increase in CHL-a concentration can be attributed to relatively deep winter mixed layer that can entrain more deep 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 in 2004 did not intensified although the winter MLD was considerably deep. A deeper spring MLD in 2004 than normal years appeared 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.ulated from 1/12° Global HYbrid Coordinate Ocean Model (HYCOM) for the period (2004-2010). In 2008, CHL-a concentration in the Ulleung basin in April reaches a maximum during the period of 2004-2010. This increase in CHL-a concentration can be attributed to relatively deep winter mixed layer that can entrain more deep 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 in 2004 did not intensified although the winter MLD was considerably deep. A deeper spring MLD in 2004 than normal years appeared 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.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26027
Bibliographic Citation
The 3rd Joint PML-KIOST Workshop on Marine Ecosystem Modelling-Observation-Remote sensing Integration (MEMORI), pp.1, 2014
Publisher
KIOST,
Type
Conference
Language
English
Publisher
KIOST,
Related Researcher
Research Interests

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

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