Dichothermal layer deepening in relation with halocline depth change associated with northward shrinkage of North Pacific western subarctic gyre in early 2000s
详细信息 查看全文
- 作者：Akira Nagano ; Masahide Wakita ; Shuichi Watanabe
- 关键词：North Pacific western subarctic gyre ; Halocline ; Dichothermal layer ; K2 ; Hydrography ; Satellite altimetry ; AGEM
- 刊名：Ocean Dynamics
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：66
- 期：2
- 页码：163-172
- 全文大小：4,083 KB
- 参考文献：Antonov JI, Locarnini RA, Boyer TP, Mishonov AV, Garcia HE (2006) World Ocean Atlas 2005, Volume 2: Salinity, U.S. Government Printing Office
Dodimead AJ, Favorite F, Hirano T (1963) Winter oceanographic conditions in the central Subarctic Pacific, . Bull Int North Pacific Comm 13:1–195
Ducet N, Le Traon PY, Reverdin G (2000) Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2. J Geophys Res 105(C8):19,477–19,498CrossRef
Favorite F, Dodimead AJ, Nasu K (1976) Oceanography of the subarctic Pacific region,. Bull Int North Pacific Comm 33:1–187
Hata K (1965) Seasonal variation of the volume transport in the Oyashio area. J Oceanogr Soc Japan 21(5):193–201
Horel JD, Wallace JM (1981) Planetary-scale atmospheric phenomena associated with the southern oscillation. Mon Wea Rev 109:813–829CrossRef
Kakinoki K, Imawaki S, Uchida H, Nakamura H, Ichikawa K, Umatani S, Nishina A, Ichikawa H, Wimbush M (2008) Variations of Kuroshio geostrophic transport south of Japan estimated from long-term IES observations. J Oceanogr 66:373–384CrossRef
Katsumata K, Yasuda I (2010) Estimates of non-tidal exchange transport between the Sea of Okhotsk and the North Pacific. J Oceanogr 66:489–504CrossRef
Kuroda H, Wagawa T, Shimizu Y, Ito S, Kakehi S, Okunishi T, Ohno S, Kusaka A (2015) Interdecadal decrease of the Oyashio transport on the continental slope off the southeastern coast of Hokkaido. Japan J Geophys Res 120. doi:10.1002/2014JC010402
Locarnini RA, Mishonov AV, Antonov JI, Boyer TP, Garcia HE (2006) World Ocean Atlas 2005, Volume 1: Temperature, U.S. Government Printing Office
Miura T, Suga T, Hanawa K (2002) Winter mixed layer and formation of dichothermal water in the Bering Sea. J Oceanogr 58:815–823CrossRef
Miura T, Suga T, Hanawa K (2003) Numerical study of formation of dichothermal water in the Bering Sea. J Oceanogr 59:369–376CrossRef
Nagano A, Ichikawa K, Ichikawa H, Konda M, Murakami K (2013) Volume transports proceeding to the Kuroshio Extension region and recirculating in the Shikoku Basin. J Oceanogr 69(3):285–293. doi:10.1007/s10872-013-0173-9 CrossRef
Nagata Y, Ohtani K, Kashiwai M (1992) Subarctic gyre in the north pacific ocean. Oceanography in Japan 1(3):75–104CrossRef
Ohtani K (1973) Oceanographic structure in the Bering Sea. Mem Fac Fish, Hokkaido Univ 21:61–106
Qiu B (2002) Large-scale variability in the midlatitude subtropical and subpolar North Pacific Ocean: Observations and causes. J Phys Oceanogr 32:353–375CrossRef
Rintoul SR, Sokolov S, Church J (2002) A 6 year record of baroclinic transport variability of the antarctic circumpolar current at 140∘E derived from expendable bathythermograph and altimeter measurements . J Geophys Res 107 (C10). doi:10.1029/2001JC000787
Sekine Y (1999) Anomalous southward intrusions of the Oyashio east of Japan: 2. two-layer numerical model . J Geophys Res 104(C2):3049–3058. doi:10.1029/1998JC900044 CrossRef
Sokolov S, King BA, Rintoul SR, Rojas RL (2004) Upper ocean temperature and the baroclinic transport stream function relationship in Drake Passage. J Geophys Res 109(C5). doi:10.1029/2003JC002010
Sun C, Watts DR (2001) A circumpolar gravest empirical mode for the Southern Ocean hydrography . J Geophys Res 106(C2):2833–2855CrossRef
Thomson RE, Emery WJ (2014) Data Analysis Methods in Physical Oceanography, third ed. Elsevier
Uehara K, Ito S, Miyake H, Yasuda I, Shimizu Y, Watanabe T (2004) Absolute volume transports of the Oyashio referred to moored current meter data crossing the OICE. J Oceanogr 60:397–409CrossRef
Wakita M, Watanabe S, Murata A, Tsurushima N, Honda M (2010) Decadal change of dissolved inorganic carbon in the subarctic western North Pacific Ocean. Tellus 62B:608–620. doi:10.1111/j.1600-0889.2010.00476.x CrossRef
Wakita M, et al. (2013) Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean. Biogeosciences 10:7817–7827. doi:10.5194/bg-10-7817-2013 CrossRef - 作者单位：Akira Nagano (1)
Masahide Wakita (2)
Shuichi Watanabe (2)
1. Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho Yokosuka, Kanagawa, 237-0061, Japan
2. Mutsu Institute for Oceanography, Japan Agency for Marine-Earth Science and Technology, 690 Kitasekine Sekine Mutsu, Aomori, 035-0022, Japan - 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Oceanography
Geophysics and Geodesy
Meteorology and Climatology
Fluids
Structural Foundations and Hydraulic Engineering - 出版者：Springer Berlin / Heidelberg
- ISSN：1616-7228
文摘
In the western subarctic North Pacific, a wind-driven cyclonic circulation, called the western subarctic gyre (WSAG), exists. We examined year-to-year changes of the gyre and hydrographic structures, applying the altimetry-based gravest empirical mode (AGEM) method to hydrographic and altimetric sea surface height (SSH) data, and relation to the in situ variation of the temperature minimum layer, i.e., the dichothermal layer, depth at station K2 (47∘ N, 160∘ E). The AGEM-based geostrophic volume transport and the streamfunction of the WSAG in the top 1000-dbar layer show that the gyre changes substantially. From the late 1990s to the mid-2000s, the gyre shrunk northward. Due to the shrinkage, the halocline bottom, which is equivalent to the top of the main pycnocline, deepens at K2 outside the central part of the gyre. The downward displacement of the dichothermal layer at K2 was found to be significantly related to that of the underlying halocline due to the northward shrinkage of the WSAG. Keywords North Pacific western subarctic gyre Halocline Dichothermal layer K2 Hydrography Satellite altimetry AGEM