全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
海洋科学  2008 

南海北部陆坡区混合过程观测

, PP. 10-16

Keywords: 南海北部陆坡区,盐指,湍动能耗散率,热耗散率,混合效率

Full-Text   Cite this paper   Add to My Lib

Abstract:

为了解南海北部陆坡区的内部混合过程,2004年4月30日至5月1日,“延平2号”科考船在该海域利用自由沉降式的微结构剖面仪TurboMAP-Ⅱ进行了一次混合过程的直接观测。观测海区南海次表层水团和南海中层水团形成的特定温盐结构,使得150~500m之间出现盐指现象。通过对观测数据的处理和分析,研究了观测海区的湍动能耗散率、热耗散率和热扩散系数的分布以及盐指现象对混合效率的影响。观测海区的湍动能耗散率为2.0×10-10~7.8×10-7W/kg,最大值出现在上混合层;热耗散率为2.7×10-9~1.5×10-6℃2/s,最大值出现在温跃层附近。层结稳定区混合效率的平均值为0.18,与常用值0.2非常接近,盐指发生区混合效率的平均值为0.76,表明盐指现象的存在提高了混合效率。

References

[1]  Ming-Huei C, RewChieh L, Tewen Yung T, et al. Energy flux of nonlinear internal waves in northern South China Sea[J].Geophys Res Lett, 2006, 33, L03607, doi:10. 1029/2005GL025196.
[2]  李凤歧 苏育嵩.海洋水团分析[M].青岛:青岛海洋大学出版社,1999.374-379.
[3]  Laurent L S, Sehimitt R W. The contribution of salt fingers to vertical mixing in the north Atlantic tracer release experiment[J].J Phys Oeeanogr, 1999, 29 (7): 1 404-1 424.
[4]  MeDougall T J, Ruddick B R. The use of ocean microstructure to quantify both turbulent mixing and salt-fin gering[J]. Deep-Sea Res, 1992, 39:1931-1952.
[5]  Oakey N S. Statistics of mixing parameters in the upper ocean during JASIN Phase 2[J]. J Phys Oceanogr, 1985, 15(12): 1 662 1 675.
[6]  Osborn T R, Cox C S. Oceanic fine structure[J]. Geophysical Fluid Dynamics, 1972, 3: 321-345.
[7]  Hamilton J M, Oakey N S, Kelley D E. Salt finger signatures in mierostructure measurements[J].J Geophys Res, 1993, 98:2 453-2 460.
[8]  Turner J S. Buoyancy effects in fluids [M]. Cambridge:Cambridge University Press, 1973.
[9]  Ruddick B R. A practical indicator of the stability of the water column to double-diffusive activity [J]. Deep-Sea Res, 1983, 30:1 105-1 107.
[10]  Zhao Zhongxiang, Klemas V, Zheng Quanan, el al. Remote sensing evidence for baroclinic tide origin of internal solitary waves in the northeastern South China Sea[J]. Geophys Res Lett, 2004, 31, L06302, doi: 10. 1029/2003GL019077.
[11]  方文东 施平 龙小敏 等.南海北部孤立内波的现场观测[J].科学通报,2005,50(13):1400-1404.
[12]  Stern M E, Turner J S. Salt fingers and convecting layers [J]. Deep-SeaRes, 1969, 16:497-511.
[13]  Lambert R B, Sturges W. A thermohalinc staircase and vertical mixing in the thermocline[J]. Deep-Sea Res, 1977, 24: 211-222.
[14]  Schmitt R W. Form of the temperature-salinity relationship in the central water: evidence for double-diffusive mixing [J]. J Phys Oceanogr, 1981, 11:1 015-1 026.
[15]  Kelley D E, Fernando H J S, Gargett A E, etal. The diffusive regime of double-diffusive convection [J]. Prog Oceanogr, 2003, 56:461-481.
[16]  Kunze E. A review of oceanic salt-fingering theory[J]. Prog Oeeanogr, 2003, 56: 399-417.
[17]  Schmitt R W. Observational and laboratory insights into salt finger conveetion[J].Prog Oeeanogr, 2003, 56(3-4): 419 433.
[18]  Ryuichiro I, Yamazaki H, Fabian W, etal. An estimation of buoyancy flux for a mixture of turbulence and double diffusion[J].J Phys Oeeanogr, 2007, 37 (3): 611-624.
[19]  周磊 田纪伟 张效谦.东海陆架坡折处小尺度过程观测[J].科学通报,2005,50(16):1784-1788.
[20]  梁鑫峰 田纪伟 张效谦.东海陆架坡折处温度微结构观测[J].自然科学进展,2006,16:1268-1274.
[21]  Osborn T R, Crawford W R. An airfoil probe for measuring turbulent velocity fluctuations in water [A]. Dobson F, Hasse L, Davis R. Air - Sea Inter- action: Instruments and Methods[C]. New York: Plenum Press, 1980. 369-386.
[22]  Lueck R G, Huang D, Newman D, et al. Turbulence measurements with an autonomous moored instrument [J]. J Atmos Oceanic Teehnol, 1997, 14:143-161.
[23]  Gregg M C. Uncertainties and limitations in measuring εand χτ[J]. J Atmos Oceanic Technol, 1999, 16: 1 483-1 490.
[24]  Osborn T R. Estimates of the local rate of vertical dif fusion from dissipation measurements [J]. J Phys Oceanogr, 1980, 20:83-89.
[25]  You Y. A global ocean climatological atlas of the Turner angle: implications for double-diffusion and water-mass structure[J]. Deep-Sea Res, 2002, 49:2075-2093.
[26]  Schmitt R W, Ledwell J T, Montgomery E T, et al. Enhanced diapycnal mixing by salt fingers in the thermoeline of the tropical Atlantie[J].Science, 2005, 308: 685-688.
[27]  Rohr J J, Itsweire E C, van Atta C W. Mixing efficiency in stably-stratified decaying turbulence[J]. Geophysical and Astrophysical Fluid Dynamics, 1984, 29(1) : 221-236.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133