북서태평양 열대해역에서 관측된 수괴의 경년변동성
Interannual Variability of the Water Masses Observed in the Tropical Northwestern Pacific
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The interannual variability of the water masses was analyzed from the CTD data measured in the tropical northwestern Pacific from 2006 to 2014. There are two typical water masses NPTW and NPIW that reveal the interannual variability in the survey area, in addition to two other water masses; the surface water mass TSW with a large seasonal variability and the deep water mass AACDW with a constant temperaturesalinity characteristic at the depths deeper than 2,000 meters. In 2012 and 2014 NPTW was the most widely extended horizontally and thicker than 100 meters vertically, which was found over the entire survey area. However, NPTW was reduced and became much narrower in 2009 than in the other years. NPIW seemed to expand southwards from the north of 21oN to 15oN in 2008 and in 2012, which showed the salinity minimum in 2013 (< 34.15 psu). The sea surface height estimated by Absolute Dynamic Topography (ADT) approximately along 135oE section showed the high peaks (> 1.45 dyn·m) between 16oN and 18oN during the periods between 2007 and 2009 and between 2012 and 2013; the former peak lasted wider and longer in latitude and time (about three times) than the latter. The vertical section of the geostrophic currents in the upper 1,000 meters shows that there was a mesoscale pattern of repeated eastward and westward flows a few times in some years (2010 and 2014), which seemed to disappear in some other years (2008 and 2012); the former was closely related to the mesoscale eddies and the latter implied the pattern with the permanent currents. The persistent eastward flow between 17oN and 19oN seems to be related to the Subtropical Countercurrent (STCC).
Abstract
The interannual variability of the water masses was analyzed from the CTD data measured in the tropical northwestern Pacific from 2006 to 2014. There are two typical water masses NPTW and NPIW that reveal the interannual variability in the survey area, in addition to two other water masses; the surface water mass TSW with a large seasonal variability and the deep water mass AACDW with a constant temperaturesalinity characteristic at the depths deeper than 2,000 meters. In 2012 and 2014 NPTW was the most widely extended horizontally and thicker than 100 meters vertically, which was found over the entire survey area. However, NPTW was reduced and became much narrower in 2009 than in the other years. NPIW seemed to expand southwards from the north of 21oN to 15oN in 2008 and in 2012, which showed the salinity minimum in 2013 (< 34.15 psu). The sea surface height estimated by Absolute Dynamic Topography (ADT) approximately along 135oE section showed the high peaks (> 1.45 dyn·m) between 16oN and 18oN during the periods between 2007 and 2009 and between 2012 and 2013; the former peak lasted wider and longer in latitude and time (about three times) than the latter. The vertical section of the geostrophic currents in the upper 1,000 meters shows that there was a mesoscale pattern of repeated eastward and westward flows a few times in some years (2010 and 2014), which seemed to disappear in some other years (2008 and 2012); the former was closely related to the mesoscale eddies and the latter implied the pattern with the permanent currents. The persistent eastward flow between 17oN and 19oN seems to be related to the Subtropical Countercurrent (STCC).
참고문헌 (17)
- 김동국, "북서태평양 수온 연변동과 우리나라 기온과의 관계", 석사, 대기과학, pp.2006
- 안중배, "한반도 기온및 강수량과 적도 태평양 해면 온도와의 상관관계에 관한연구", 한국기상학회지, 33(3), pp.487~495 (1997)
- CLS, "SSALTO", DUACS user handbook : (M)SLA and (M)ADT near-real time and delayed time products, 2015, pp.66~
- Fine RA, "The western equatorial Pacific : a water mass crossroads", J Geophys Res, 99(C12), pp.25063~25080 (1994)
- Lingling X, "A quasisynoptic interpretation of water mass distribution and circulation in the western North Pacific : I. Water mass distribution", Chin J Oceanol Limn, 27(3), pp.630~639 (2009)
- Lukas R, "The Mixed Layer of the Western Equatorial Pacific Ocean", J Geophys Res, 96(C01), pp.3343~3357 (1991)
- Lukas R, "Pacific lowlatitude western boundary currents and the Indonesian throughflow", J Geophys Res, 101(C5), pp.12209~12216 (1996)
- Nakano T, "Long-term variations of North Pacific Tropical Water along the 137oE repeat hydrographic section", J Oceanogr, 71(3), pp.229~238 (2015)
- Nitani H, "Kuroshio: its physical aspects", pp.129~163 (1972), University of Tokyo Press
- Qiu B, "Seasonal and interannual variability of the North Equatorial Current, the Mindanao Current, and the Kuroshio along the Pacific western boundary", J Geophys Res, 101(C5), pp.12315~12330 (1996)
- Qu T, "A Climatology of the circulation and water mass distribution near the Philippine Coast", J Geophys Res, 29(7), pp.1488~1505 (1999)
- Qu T, "Intrusion of the North Pacific waters into the South China Sea", J Geophys Res, 105(C3), pp.6415~6424 (2000)
- Shimizu Y, "Formation process on North Pacific intermediate water revealed by profiling floats set to drift on 26. 7 σθ isopycnal surface", J Oceanogr, 60(2), pp.453~462 (2004)
- Suga T, "North Pacific tropical water : its climatology and temporal changes associated with the climate regime shift in the 1970s", Prog Oceanog, 47(2), pp.223~256 (2000)
- Talley LD., "Distribution and formation of North Pacific intermediate water", J Geophys Res, 23(3), pp.517~537 (1993)
- Tsuchiya M, "Upper waters of the intertropical Pacific Ocean", pp.50~ (1968), The Johns Hopkins Press
- Wyrtki K, "Physical oceanography of the Southeast Asian waters", pp.195~ (1961), Scripps Institution of Oceanography