Abstract
The transport of Japan Basin Bottom Water (JBBW) into the Yamato Basin in the Japan Sea is an important boundary condition for the modification of the abyssal water mass in the Yamato Basin. To estimate the volume transport of JBBW, two year-long observations (October 2011–October 2012 and May 2014–May 2015) were carried out using current meters moored in the deep channel connecting the Japan Basin with the Yamato Basin. The mean transport toward the Yamato Basin from the Japan Basin was estimated to be 7.37 × 104 and 5.15 × 104 m3 s−1, consistent with previous estimates from box model analysis and lowered acoustic Doppler current profiler observations. The time series of JBBW transport showed significant variability. A cause of the variability was bottom-intensified flow fluctuations in the 3- to 15-day period band, which suggests bottom-trapped topographic Rossby waves in the deep channel. In addition, during August–October 2014, notable variation of JBBW transport accompanied significant decreases of potential temperature and dissolved oxygen concentration. Detailed examination of the episodic variations of flows, potential temperature, and dissolved oxygen concentration, together with consideration of sea surface height variations, suggested that rapid northward meandering of the surface subarctic front was another cause of the significant variation in JBBW transport.
Similar content being viewed by others
References
Bethoux JP, Gentili B, Raunet J, Tailliez D (1990) Warming trend in the western Mediterranean deep water. Nature 347:660–662
Bethoux JP, Gentili B, Tailliez D (1998) Warming and freshwater budget change in the Mediterranean since 1940s, their possible relation to the greenhouse effect. Geophys Res Lett 25:1023–1026
Bindoff, NL, Willebrand J, Artale V, Cazenave A, Gregory J, Gulev S, Hanawa K, Le Quéré C, Levitus S, Nojiri Y, Shum CK, Talley LD, Unnikrishnan A (2007) Observations: oceanic climate change and sea level. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) Climate change 2007: the physical science basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, pp 385–432
Choi YG, Yoon JH (2010) Structure and seasonal variability of the deep mean circulation of the East Sea (Sea of Japan). J Oceanogr 66:349–361. doi:10.1007/s10872-010-0031-y
Cui Y, Senjyu T (2010) Interdecadal oscillations in the Japan Sea Proper Water related to the Arctic Oscillation. J Oceanogr 66:337–348. doi:10.1007/s10872-010-0030-z
Cui Y, Senjyu T (2012) Has the upper portion of the Japan Sea proper water formation really been enhancing? J Oceanogr. doi:10.1007/s10872-012-0115-y
Fischer J, Visbeck M, Zantopp R, Nunes N (2010) Interannual to decadal variability of outflow from the Labrador Sea. Geophys Res Lett 37:L24610. doi:10.1029/2010GL045321
Gamo T (1999) Global warming may have slowed down the deep conveyor belt of a marginal sea of the northwestern Pacific: Japan Sea. Geophys Res Lett 26:3137–3140
Gamo T, Nozaki Y, Sakai H, Nakai T, Tsubota H (1986) Spatial and temporal variations of water characteristics in the Japan Sea bottom layer. J Mar Res 44:781–793
Hamilton P (2007) Deep-current variability near the Sigsbee Escarpment in Gulf of Mexico. J Phys Oceanogr 37:708–726
Hanawa K, Mitsudera H (1985) On the data processing of daily mean values of oceanographical data—note on the daily mean sea-level data. Bull Coast Oceanogr 23:79–87
Isoda Y (1994) Interannual SST variations to the north and south of the polar front in the Japan Sea. La Mer 32:285–293
Itoh M (2007) Warming of intermediate water in the Sea of Okhotsk since the 1950s. J Oceanogr 63:637–641
Jochumsen K, Quadfasel D, Valdimarsson H, Jonsson S (2012) Variability of the Denmark Strait overflow: moored time series from 1996–2011. J Geophys Res 117:C12003. doi:10.1029/2012JC008244
Kundu PK, Allen JS (1976) Some three-dimensional characteristics of low-frequency current fluctuations near the Oregon coast. J Phys Oceanogr 6:181–199
Minami H, Kano Y, Ogawa K (1999) Long-term variations of potential temperature and dissolved oxygen of the Japan Sea Proper Water. J Oceanogr 55:197–205
Nakanowatari T, Ohshima KI, Wakatsuchi M (2007) Warming and oxygen decrease of intermediate water in the northwestern North Pacific, originating from the Sea of Okhotsk, 1955–2004. Geophys Res Lett 34:L04602. doi:10.1029/2006GL028243
Rhines PB (1970) Edge-, bottom-, and Rossby waves in a rotating stratified fluid. Geophys Fluid Dyn 1:273–302
Rixen M, Beckers JM, Levitus S, Antonov J, Boyer T, Maillard C, Fichaut M, Balopoulos E, Iona S, Dooley H, Garcia MJ, Manca B, Giorgetti A, Manzella G, Mikhailov N, Pinardi N, Zavatarelli M (2005) The Western Mediterranean Deep Water: a proxy for climate change. Geophys Res Lett 32:L12608. doi:10.1029/2005GL022702
Roether W, Klein B, Manca BB, Theocharis A, Kioroglou S (2007) Transient Eastern Mediterranean deep waters in response to the massive dense-water output of the Aegean Sea in the 1990s. Prog Oceanogr 74:540–571
Senjyu T, Aramaki T, Otosaka S, Togawa O, Danchenkov M, Karasev E, Volkov Y (2002) Renewal of the bottom water after the winter 2000–2001 may spin-up the thermohaline circulation in the Japan Sea. Geophys Res Lett. doi:10.1029/2001GL014093
Senjyu T, Isoda Y, Aramaki T, Otosaka S, Fujio S, Yanagimoto D, Suzuki T, Kuma K, Mori K (2005a) Benthic front and the Yamato Basin Bottom Water in the Japan Sea. J Oceanogr 61:1047–1058. doi:10.1007/s10872-006-0021-2
Senjyu T, Shin HR, Yoon JH, Nagano Z, An HS, Byun SK, Lee CK (2005b) Deep flow field in the Japan/East Sea as deduced from direct current measurements. Deep-Sea Res II 52:1726–1741. doi:10.1016/j.dsr2.2003.10.013
Senjyu T, Aramaki T, Tanaka SS, Zhang J, Isoda Y, Kumamoto Y, Hibino S, Nakano T (2013) Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea. J Geophys Res Oceans 118:4878–4888. doi:10.1002/jgrc.20373
Sudo H (1986) A note on the Japan Sea Proper Water. Prog Oceanogr 17:313–336
Theocharis A, Nittis K, Kontoyiannis H, Papageorgiou E, Balopoulos E (1999) Climatic changes in the Aegean Sea influence the Eastern Mediterranean thermohaline circulation (1986–1997). Geophys Res Lett 26:1617–1620
Uehara K, Miyake H (2000) Biweekly periodic deep flow variability on the slope inshore of the Kuril-Kamchatka Trench. J Phys Oceanogr 30:3249–3260
Zervakis V, Krasakopoulou E, Georgopoulos D, Souvermezoglou E (2003) Vertical diffusion and oxygen consumption during stagnation periods in the deep North Aegean. Deep-Sea Res I 50:53–71
Acknowledgements
We would like to thank the captain and crew of the RT/V Nagasaki Maru and all the participants of the observation cruises for the deployment and recovery of the current meters. Thanks are also due to Prof. T. Matsuno and colleagues in the Regional Oceanography Section, RIAM, Kyushu University for their useful comments and discussions. Suggestions from two anonymous reviewers helped to revise the early version of the manuscript. The JMA hydrographic data were downloaded from http://www.jma.go.jp. The satellite infrared image was provided by the Japan Aerospace Exploration Agency (JAXA) from http://www.eorc.jaxa.jp. This work was supported by the Environment Research and Technology Development Fund of Ministry of the Environment, Japan (A-1002 and 2-1604) and JSPS KAKENHI Grant Number 26610151.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Senjyu, T., Aramaki, T. Volume transport from the Japan Basin to the Yamato Basin in the abyssal Japan Sea inferred from direct current observations. J Oceanogr 73, 235–247 (2017). https://doi.org/10.1007/s10872-016-0399-4
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10872-016-0399-4