High primary productivity and f-ratio in summer in the Ulleung basin of the East/Japan Sea SCIE SCOPUS

Cited 21 time in WEB OF SCIENCE Cited 23 time in Scopus
Title
High primary productivity and f-ratio in summer in the Ulleung basin of the East/Japan Sea
Author(s)
Kwak, Jung Hyun; Hwang, Jeomshik; Choy, Eun Jung; Park, Hyun Je; Kang, Dong-Jin; Lee, Tongsup; Chang, Kyung-Il; Kim, Kyung-Ryul; Kang, Chang-Keun
KIOST Author(s)
Kang, Dong-Jin(강동진)
Publication Year
2013-09
Abstract
To better understand the cause of high summer primary productivity in the Ulleung Basin located in the southwest part of the East/Japan Sea, the spatial dynamics of primary, new, and regenerated productivities (PP, NP, and RP) were examined along the path of the Tsushima Warm Current system in summer 2008. We compared hydrographic and chemical parameters in the Ulleung Basin with those of the Kuroshio Current in the Western Pacific Ocean and the East China Sea. In summer, integrated primary productivity (IPP, 0.37-0.96 g C m(-2) d(-1)) and integrated new productivity (INP, 26-221 mg N m(-2) d(-1)) within the euphotic zone in the Ulleung Basin were higher than those in the East China Sea and the Western Pacific Ocean (0.17-0.28 g C m(-2) C d(-1), 2-5 mg N m(-2) d(-1), respectively). In Contrast, there Was no pronounced spatial variation in integrated regenerated productivity (IRP, 43-824 mg N m(-2) d(-1)). Strong positive Correlations between IPP and INP (also the f-ratio), and between nitrate uptake rate in the mixed layer and nitrate upward flux through the top of pycnocline in summer in the Ulleung Basin imply that the high IPP was mainly supported by supply of nitrate from the underlying water in the euphotic zone. Shallowing of the pycnocline depth as the current enters the East/Japan Sea facilitates nitrate supply from the nutrient-replete cold water immediately below the pycnocline through nitrate upward flux. A subsurface maximum in PP at or above the pycnocline and a high f-ratio further support the importance of this source of nitrate for maintaining the high summer PP in the Ulleung Basin. In comparison, the high PP layer was observed at the surface in the following fall and spring in the Ulleung Basin. Our results demonstrate the importance of hydrographic features in enhancing PP in this oligotrophic Tsushima Warm Current system. (C) 2013 Elsevier Ltd. All rights reserved.
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3106
DOI
10.1016/j.dsr.2013.05.011
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.79, pp.74 - 85, 2013
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
EAST CHINA SEA; PACIFIC-OCEAN; REGENERATED PRODUCTION; EQUATORIAL PACIFIC; MARINE-PHYTOPLANKTON; SEASONAL DYNAMICS; CONTINENTAL-SHELF; TROPICAL PACIFIC; NITROGEN UPTAKE; COASTAL WATERS
Keywords
Primary productivity; Nitrogen uptake; f-ratio; Hydrography; Nitrate upward flux; East/Japan Sea
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Chemical Oceanography,Dissolved Gas in seawater,Development of Instruments,화학해양학,해수용존기체,관측장비개발

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