Study on mechanism of interdecadal Atlantic thermohaline circulation variability Ⅲ.Influences of inter-decadal variations by ocean-atmosphere elements

MU Lin; CHEN Xue-en; SONG Jun; LI Huan; LI Yan; JIANG Xiao-yi; LI Hai; CHEN Xing-rong

Article Contents

Article Navigation > Haiyang Xuebao > 2011 > 33(4): 19-28

MU Lin, CHEN Xue-en, SONG Jun, LI Huan, LI Yan, JIANG Xiao-yi, LI Hai, CHEN Xing-rong. Study on mechanism of interdecadal Atlantic thermohaline circulation variability Ⅲ.Influences of inter-decadal variations by ocean-atmosphere elements[J]. Haiyang Xuebao, 2011, 33(4): 19-28.

Citation:

PDF( 1803 KB)

Study on mechanism of interdecadal Atlantic thermohaline circulation variability Ⅲ.Influences of inter-decadal variations by ocean-atmosphere elements

1.
National Marine Data and Information Service, Tianjin 300171, China;Max-Planck Institute for Meteorology, Hamburg 20146, Germany
2.
College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China
3.
National Marine Data and Information Service, Tianjin 300171, China
4.
Key laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, Beijing 100081, China

Received Date: 2010-06-03

Abstract

Abstract

Using the advanced climate ocean-atmosphere coupled model described in the first paper of this series of studies, response analyses of inter-decadal variations of the Atlantic thermohaline circulation by ocean-atmosphere elements were deliberated. For studying the relationship between the ocean elements of the North Atlantic and inter-decadal variations of Atlantic thermohaline circulation, subpolar sea-surface-density index (SSI) and North-Atlantic-Current Strength Index (NSI) were defined and analyzed. The results of analyses indicate that SSI changes 7 years earlier than Atlantic meridional overturning circulation (MOC) while NSI changing 4 years earlier than MOC. The strength of water overflows from Greenland-Scotland sea ridge (including Denmark Strait and Faro Strait),which is an important water resource of North Atlantic deep water, changes 3 years ahead MOC.The inter-decadal variations of Atlantic thermohaline circulation THC are influenced by North Atlantic atmosphere elements significantly.2 years before subpolar current and North Atlantic Current (NAC) reaching their full strength, High-latitude atmosphere is abnormal in the pattern of cyclonic circulation and middle-latitude atmosphere is abnormal in the pattern of anticyclonic circulation. Meanwhile, the sea surface heat flux in Atlantic subpolar sea area is negative anomaly. All of those abnormal conditions enhance the strength of subpolar current and NAC.More water with higher salinity intruding into Greenland-Icelandic-Norwegian Sea (GIN) brings higher sea surface density of GIN. This weakens the stability of water stratification and increases the probability of occurrence of deep convection.Meanwhile, the variation of atmosphere influences the deep water generating process in GIN by the curl of wind stress and sea surface heat flux. Then the strength of water overflows from Greenland-Scotland sea ridge is strengthened.
- thermohaline circulation,
- interdecadal variability,
- meridional overturning circulation,
- North Atlantic Current,

FullText(HTML)

References(22)

References

江志红,屠其璞. 国外有关海气系统年代际变率的机制研究[J]. 地球科学进展, 2001, 16(4): 569-573.

DONG B, SUTTON R T.Mechanism of interdecadal thermohaline circulation variability in a coupled ocean-atmosphere GC M[J]. Journal of Climate, 2005, 18: 1117-1135.

GANACHAUD A, WUNSCH C. Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data[J]. Nature, 2000, 408(6811): 453-457.

WEAVER A J, BITZ C M, FANNING A F, et al. Thermohaline circulation: High-latitude phenomena and the difference between the Pacific and Atlantic[J]. Annual Review of Earth and Planetary Sciences, 1999, 27(1): 231-285.

BROECKER W S. The great ocean conveyor[J]. Oceanography, 1991, 4(2): 79-89.

周天军,HELGE Drange. 卑尔根气候模式中大西洋热盐环流年代际与年际变率的气候影响[J]. 大气科学, 2005, 29(2): 167-177.

李双林,王彦明,郜永祺. 北大西洋年代际振荡 (AMO) 气候影响的研究评述[J]. Transactions, 2009, 32(3): 458-465.

Te REA L A, DIJKSTRA H A. Instability of the ther mohaline ocean circulation on interdecadal timescales[J]. Journal of Physical Oceanography, 2002, 32(1): 138-160.

DELWORTH T L,MANN M E. Observed and simulated multidecadal variability in the Northern Hemisphere[J]. Climate Dynamics, 2000, 16(9): 661-676.

周天军,张学洪,刘海龙. 大洋环流模式的温盐表面边界条件处理及其影响研究评述[J]. 地球科学进展, 2009, 24(2): 111-122.

PEDLOSKY Joseph. 大洋环流理论[M]. 吴德星,陈学恩,译. 北京:海洋出版社, 2002.

冯士筰. 论大洋环流的尺度分析及风旋度-热盐梯度方程式[J]. 山东海洋学院学报, 1984, 14(1): 33-43.

CHENG W, BLECK R, ROOTH C.Multi-decadal thermohaline variability in an ocean-atmosphere general circulation model[J]. Climate Dynamics, 2004, 22(6): 573-590.

MCCARTNEY M S, TALLEY L D. Warm-to-cold water conversion in the northern North Atlantic Ocean[J]. J Phys Oceanogr, 1984, 14: 922-935.

牟林. 不同 CO₂ 浓度情景下热盐环流的演变 .青岛:中国海洋大学,2007.

牟林,陈学恩,宋军,等. 大西洋热盐环流年代际变化机制研究:Ⅱ.年际和年代际变化机制研究[J]. 海洋学报,2011,33(1):12-21.

DELWORTH T,MANABE S, STOUFFER R J. Interdecadal variations of the thermohaline circulation in a coupled ocean-atmosphere model[J]. Journal of Climate, 1993, 6: 1993-2011.

周天军,张学洪. 大洋温盐环流的稳定性及变率模拟研究进展[J]. 地球科学进展, 1998, 13(4): 334-343.

牟林,陈学恩,宋军,等. 大西洋热盐环流年代际变化机制研究:Ⅰ.气候模式的建立和验证[J]. 海洋学报,2010,32(6):11-24.

龚道溢,周天军,王绍武. 北大西洋涛动变率研究进展[J]. 地球科学进展, 2001, 16(3): 413-420.

陈上及,马继瑞. 海洋数据处理分析方法及其应用[M]. 北京: 海洋出版社, 1991.

SWIFT J H, AAGAARD K,MALMBERG S A. The contribution of the Denmark Strait overflow to the deep North Atlantic[J]. Deep-Sea Research Part A: Oceanographic Research Papers, 1980, 27(1): 29-42.

Relative Articles

Supplements(0)

Cited By

Proportional views