收稿日期: 2011-04-28
修回日期: 2011-09-07
网络出版日期: 2011-10-10
基金资助
国家自然科学基金项目“北极涛动核心区的关键海洋学过程研究”（编号：40876006）资助.
Distributions and Seasonal Variations of Fronts in GIN Seas
Received date: 2011-04-28
Revised date: 2011-09-07
Online published: 2011-10-10
利用多年月平均格点数据分析了北欧海主要锋面的分布特征和季节变化规律，并讨论了月平均数据分析锋面适合使用的方法。月平均数据显示的锋面出现间断或多重的现象是锋面侧向摆动造成的，这是月平均数据的一大特点。北欧海各锋面主要水文和季节变化特征差异很大。东格陵兰极地锋在夏季锋面强度大，锋面较连续完整，而冬季强度小，锋面结构零散。9月由于东格陵兰寒流势力最强，可观察到温度梯度较大且连续的东格陵兰锋。北极锋的季节变化在水平方向呈“哑铃型”分布，中段摆动较南北两端小。由于挪威海流在冬季出现的最大流量引起挪威海流的流幅在该处加宽，莫恩海脊锋冬季向西北移动，对前人文章中基本上没有季节性移动的说法进行了修正和补充。冰岛—法罗群岛锋随深度增加向南移动，锋面强度增强，这是溢流造成的。
何琰，赵进平 . 北欧海的锋面分布特征及其季节变化[J]. 地球科学进展, 2011 , 26(10) : 1079 -1091 . DOI: 10.11867/j.issn.1001-8166.2011.10.1079
The spatial distributions and seasonal variations of the main fronts in GIN seas are analyzed by grid data of monthly mean of temperature and salinity. The suitable application method for monthly data in frontal study is discussed. As the fronts often move or swing, the front information in monthly data has been blurred and the fronts obtained by monthly mean temperature and salinity sometimes show interrupted front and multi-front phenomena. However, the blurry fronts are just the averaged status of fronts, which can only be revealed by monthly data. The fronts show significant diversity in their characteristics and seasonal variations. The East Greenland Polar Front (EGPF) is mainly a salinity front, being evident and continuous in summer and weak and interrupted in winter. The EGPF is also a temperature front in summer. The obvious temperature gradient and uninterrupted shape appears in September, being attributed to the maximum temperature difference between the East Greenland Current and the return currents at that time, which keeps the location of EGPF relatively stationary. The Arctic Front (AF) has a seasonally spatial variation with "dumbbell" shape—The seasonal displacement near the northern and southern parts of the front is much larger than that in the middle part, showing the larger swinging amplitude there. AF near the Mohn Ridge was addressed as a no-motion part, however, AF by this study is revealed to move northwestward in winter because the flux of Norwegian Current reaches the maximum then and induces the broadest width of the current near the Mohn Ridge area. A special characteristic of the Iceland-Faroe Front is that the interface of the front appears more southward and stronger in deep part, which is caused by the overflow above the ridge.
[1] Swift J H, Aagaard K. Seasonal transitions and water mass formation in the Iceland and Greenland seas[J].Deep Sea Research Part A:Oceanographic Research Papers,1981,28(10):1 107-1 129.
[2] Helland-Hansen B, Nansen F. The Norwegian Sea, Its Physical Oceanography based upon the Norwegian Researches 1900-1904[R].Report on Norwegian Fishery and Marine-Investigations 11(2).Kristiania det Mallingske Bogtrykkeri,1909.
[3] Rudels B, Fahrbach E, Meincke J, et al. The East Greenland Current and its contribution to the Denmark Strait overflow[J].ICES Journal of Marine Science, 2002, 59(6): 1 133-1 154.
[4] Wadhams P, Gill A E, Linden P F. Transects by submarine of the East Greenland Polar Front[J].Deep Sea Research Part A:Oceanographic Research Papers, 1979, 26(12): 1 311-1 327.
[5] Aagaard K, Coachman L K. The East Greenland Current north of Denmark Strait: Part I[J].Arctic,1968, 21(3): 181-200.
[6] Paquette R G, Bourke R H, Newton J F, et al. The East Greenland Polar front in autumn[J].Journal of Geophysical Research,1985, 90(C3): 4 866-4 882.
[7] Manley T O, Hunkins K L, Muench R D. Current regimes across the east Greenland polar front at 78°40′ north latitude during summer 1984[J].Journal of Geophysical Research,1987, 92(C7): 6 741-6 753.
[8] Dietrich G. Atlas of the Hydrography of the Northern North Atlantic Ocean[M].Copenhagen: International Council for the Exploration of the Sea, 1969.
[9] Hopkins T S. The GIN Sea—A synthesis of its physical oceanography and literature review 1972-1985[J]. Earth-Science Reviews, 1991, 30(3/4): 175-318.
[10] Van Aken H M, Quadfasel D, Warpakowski A. The arctic front in the Greenland Sea during February 1989: Hydrographic and biological observations[J].Journal of Geophysical Research, 1991, 96(C3): 4 739-4 750.
[11] Cottier F R, Venables E J. On the double-diffusive and cabbeling environment of the Arctic Front, West Spitsbergen[J].Polar Research, 2007, 26(2): 152-159.
[12] Nilsen J E , Falck E. Variations of mixed layer properties in the Norwegian Sea for the period 1948-1999[J].Progress in Oceanography, 2006, 70(1): 58-90.
[13] Smart J H. Spatial variability of major frontal systems in the North Atlantic-Norwegian Sea area: 1980-1981[J].Journal of Physical Oceanography, 1984, 14(1): 185-192.
[14] Hansen B, Østerhus S, Hátún H, et al. The Iceland-Far inflow of Atlantic water to the Nordic Seas[J].Progress in Oceanography, 2003, 59(4): 443-474.
[15] Kostianoy A G, Nihoul J C J, Rodionov V B. Physical Oceanography of Frontal Zones in the Subarctic Seas[M]. Amsterdam: Elsevier, 2004.
[16] Blindheim J, sterhus S. The Nordic Seas, main oceanographic features[C]∥Drange H, et al, eds. The Nordic Seas: An Integrated Perspective Oceanoraphy, Climatology, Biogeochemistry, and Modeling. Washington DC: AGU, 2005: 11-37.
[17] Kostianoy A G, Nihoul J C J. Frontal zones in the Norwegian, Greenland, Barents and Bering Seas[C]∥Nihoul J C J, et al, eds. Influence of Climate Change on the Changing Arctic and Sub-Arctic Conditions. Dordrecht: Springer, 2009: 171-190.
[18] Parsons A R, Bourke R H, Muench R D, et al. The Barents Sea Polar front in summer[J]. Journal of Geophysical Research, 1996, 101(C6): 14 201-14 221.
[19] Willebrand J, Meincke J. Statistical analysis of fluctuations in the Iceland-Scotland frontal zone[J]. Deep Sea Research Part A: Oceanographic Research Papers,1980, 27(12): 1 047-1 066.
[20] Gould W J, Loynes J, Backhaus J. Seasonality in slope current transport N.W. of Shetland[C]∥ICES Station of Meeting 1985, C. M,1985.
[21] Pistek P, Johnson D R. Transport of the Norwegian Atlantic Current as determined from satellite altimetry[J].Geophysical Research Letters, 1992, 19(13): 1 379-1 382.
[22] Samuel P, Johannessen J A, Johannessen O M. A study on the inflow of Atlantic Water to the GIN Sea using GEOSAT altimeter data[C]∥Johannessen O M, et al, eds. The Polar Oceans and Their Role in Shaping the Global Environment: The Nansen Centennial Volume. Washington DC: AGU, 1994: 95-108.
[23] Griffiths C. A fine resolution numerical model of the Iceland-Faroe front with open boundary conditions[J].Journal of Geophysical Research, 1995, 100(C8): 15 915-15 931.
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