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Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool
Qin Sisi1,2; Zhang Qilong1; Yin Baoshu1
2015-07-01
发表期刊ACTA OCEANOLOGICA SINICA
卷号34期号:7页码:44-53
文章类型Article
摘要Using the 28A degrees C isotherm to define the Western Pacific Warm Pool (WPWP), this study analyzes the seasonal variability of the WPWP thermohaline structure on the basis of the monthly-averaged sea temperature and salinity data from 1950 to 2011, and the dynamic and thermodynamic mechanisms based on the monthly-averaged wind, precipitation, net heat fluxes and current velocity data. A Delta T=-0.4A degrees C is more suitable than other temperature criterion for determining the mixed layer (ML) and barrier layer (BL) over the WPWP using monthly-averaged temperature and salinity data. The WPWP has a particular thermohaline structure and can be vertically divided into three layers, i.e., the ML, BL, and deep layer (DL). The BL thickness (BLT) is the thickest, while the ML thickness (MLT) is the thinnest. The MLT has a similar seasonal variation to the DL thickness (DLT) and BLT. They are all thicker in spring and fall but thinner in summer. The temperatures of the ML and BL are both higher in spring and autumn but lower in winter and summer with an annual amplitude of 0.15A degrees C, while the temperature of the DL is higher in May and lower in August. The averaged salinities at these three layers are all higher in March but lower in September, with annual ranges of 0.41-0.45. Zonal currents, i.e., the South Equatorial Current (SEC) and North Equatorial Counter Current (NECC), and winds may be the main dynamic factors driving the seasonal variability in the WPWP thermohaline structure, while precipitation and net heat fluxes are both important thermodynamic factors. Higher (lower) winds cause both the MLT and BLT to thicken (thin), a stronger (weaker) NECC induces MLT, BLT, and DLT to thin (thicken), and a stronger (weaker) SEC causes both the MLT and BLT to thicken (thin) and the DLT to thin (thicken). An increase (decrease) in the net heat fluxes causes the MLT and BLT to thicken (thin) but the DLT to thin (thicken), while a stronger (weaker) precipitation favors thinner (thicker) MLT but thicker (thinner) BLT and DLT. In addition, a stronger (weaker) NECC and SEC cause the temperature of the three layers to decrease (increase), while the seasonal variability in salinity at the ML, BL, and DL might be controlled by the subtropical cell (STC).
关键词Western Pacific Warm Pool Thermohaline Structure Barrier Layer Mixed Layer Seasonal Variability
DOI10.1007/s13131-015-0696-6
收录类别SCI
语种英语
WOS记录号WOS:000358256500005
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/49208
专题海洋环流与波动重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Qin Sisi,Zhang Qilong,Yin Baoshu. Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool[J]. ACTA OCEANOLOGICA SINICA,2015,34(7):44-53.
APA Qin Sisi,Zhang Qilong,&Yin Baoshu.(2015).Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool.ACTA OCEANOLOGICA SINICA,34(7),44-53.
MLA Qin Sisi,et al."Seasonal variability in the thermohaline structure of the Western Pacific Warm Pool".ACTA OCEANOLOGICA SINICA 34.7(2015):44-53.
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