The Impact of Super Typhoon Saomai (0608) on the Offshore Environment near the Yangtze Estuary
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摘要: 台风是短期改变海洋环境的重要动力因素，会对近岸河口环境产生巨大的影响.基于0608号台风“桑美”过境前后长江口外海域多个站位的调查资料，分析了台风过境前后长江口外海域温度、盐度、浊度等环境要素的变化.结果表明：在台风引起的水体平流输运和垂向混合作用下，长江口外海域的温度、盐度、浊度等结构发生了较大改变.表层水体的温度降低，盐度增大；底层水体温度升高，盐度降低；温跃层厚度增大，层结构强度减弱；东部海域的盐跃层基本消失，温盐跃层对营养盐垂向输运的限制减弱，导致叶绿素a浓度值升高；台湾暖流底层冷水明显向近岸涌升，近岸上升流特征更为显著，同时台湾暖流底层冷水的中心位置向东偏移；水体浊度减小，尤其是近岸水深较浅海域，细颗粒沉积物被强平流作用输运.Abstract: Typhoon is an important dynamic factor for short-term changes in the marine environment, which have a huge impact on the coastal estuarine environment. Based on the filed observation offshore near Yangtze Estuary before and after the typhoon "Saomai", the variations of water environment factors were analyzed in horizontal and vertical distribution. The results show that the temperature, salinity, chlorophyll a and turbidity changes were largely due to the advection transport and vertical mixing in the water body caused by the typhoon. The surface water temperature decreased and salinity increased, whereas the bottom water temperature increased and salinity decreased. The thickness of thermocline increased and stratifications got weaker than those before the typhoon, and the halocline almost disappeared in eastern area. The vertical transport of nutrient enhanced, causing an increase of the chlorophyll a. After the typhoon, the bottom cold water from the Taiwan warm current rose clearly in coastal area, and the upwelling feature was more significant, and the center of the Taiwan warm current in the bottom shifted eastward. The water turbidity decreased, especially in the shallow coastal waters, fine-grained sediments were flow transported by stronger advection.
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Key words:
- Yangtze Estuary /
- typhoon /
- temperature /
- salinity /
- chlorophyll a /
- turbidity /
- marine geology
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图 1 研究海域地形与调查站位
黄线为观察断面位置
Fig. 1. Topographic sketch of study area and station locations
图 3 台风前研究海域温度、盐度、叶绿素a和浊度平面(表层、底层)分布
Fig. 3. Temperature, salinity, chlorophyll a and turbidity distributions in the surface and bottom layers of study area before typhoon "Saomai"
图 4 台风前A、B、C断面的温度、盐度、叶绿素a和浊度分布
Fig. 4. Temperature, salinity, chlorophyll a and turbidity distributions in A, B and C sections before typhoon "Saomai"
图 5 台风后研究海域温度、盐度、叶绿素a和浊度平面(表层、底层)分布
Fig. 5. Temperature, salinity, chlorophyll a and turbidity distributions in the surface and bottom layers of study area after typhoon "Saomai"
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Beardsley, R.C., Limeburner, R., Yu, H., et al., 1985.Discharge of the Changjiang (Yangtze River) into the East China Sea.Continental Shelf Research, 4(1-2):57-76.doi: 10.1016/0278-4343(85)90022-6 Behrenfeld, M.J., O'Malley, R.T., Siegel, D.A., et al., 2006.Climate-Driven Trends in Contemporary Ocean Productivity.Nature, 444(7120):752-755.doi: 10.1038/nature05317 Chen, C.T.A., Liu, C.T., Chuang, W.S., et al., 2003.Enhanced Buoyancy and Hence Upwelling of Subsurface Kuroshio Waters after a Typhoon in the Southern East China Sea.Journal of Marine Systems, 42(1-2):65-79. doi: 10.1016/S0924-7963(03)00065-4 Fujii, T., Maeda, J., Ishida, N., et al., 2002.An Analysis of a Pressure Pattern in Severe Typhoon Bart Hitting the Japanese Islands in 1999 and a Comparison of the Gradient Wind with the Observed Surface Wind.Journal of Wind Engineering and Industrial Aerodynamics, 90(12-15):1555-1568.doi: 10.1016/S0167-6105(02)00270-2 Herbeck, L.S., Unger, D., Krumme, U., et al., 2011.Typhoon-Induced Precipitation Impact on Nutrient and Suspended Matter Dynamics of a Tropical Estuary Affected by Human Activities in Hainan, China.Estuarine, Coastal and Shelf Science, 93(4):375-388.doi: 10.1016/j.ecss.2011.05.004 Hu, M.N., Zhao, C.F., 2008.Upwelling in Zhejiang Coastal Areas during Summer Detected by Satellite Observations.Journal of Remote Sensing, 12(2):297-304 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-YGXB200802015.htm Li, X.Q., Liu, Y.D., Zhou, A.G., et al., 2014.Sulfur and Oxygen Isotope Compositions of Dissolved Sulfate in the Yangtze River during High Water Period and Its Sulfate Source Tracing.Earth Science, 39(11):1547-1554 (in Chinese with English abstract). Lugo-Fernández, A., Gravois, M., 2010.Understanding Impacts of Tropical Storms and Hurricanes on Submerged Bank Reefs and Coral Communities in the Northwestern Gulf of Mexico.Continental Shelf Research, 30(10-11):1226-1240.doi: 10.1016/j.csr.2010.03.014 Miao, Z.Q., Li, P., Shui, B.N., 1995.Hydrologic Characteristics of Zhejiang Fishing Grounds in the Summer-Autumn.Journal of Zhejiang College of Fisheries, 14(1):14-19 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-REEF501.002.htm Shi, X.Y., Li, H.M., Wang, H., et al., 2013.Taiwan Warm Current and Its Impact on the Areas of Frequent Harmful Alga Bloom in the East China Sea in Summer.Oceanologia et Limnologia Sinica, 44(5):1208-1215 (in Chinese with English abstract). http://qdhys.ijournal.cn/hyyhze/ch/reader/view_abstract.aspx?file_no=201305012 Shiah, F.K., Chung, S.W., Kao, S.J., et al., 2000.Biological and Hydrographical Responses to Tropical Cyclones (Typhoons) in the Continental Shelf of the Taiwan Strait.Continental Shelf Research, 20(15):2029-2044.doi: 10.1016/s0278-4343(00)00055-8 Wang, X.D., Han, G.J., Qi, Y.Q., et al., 2011.Impact of Barrier Layer on Typhoon-Induced Sea Surface Cooling.Dynamics of Atmospheres and Oceans, 52(3):367-385.doi: 10.1016/j.dynatmoce.2011.05.002 Wetz, M.S., Paerl, H.W., 2008.Estuarine Phytoplankton Responses to Hurricanes and Tropical Storms with Different Characteristics (Trajectory, Rainfall, Winds).Estuaries and Coasts, 31(2):419-429.doi: 10.1007/s12237-008-9034-y Williams, J.J., Rose, C.P., 2001.Measured and Predicted Rates of Sediment Transport in Storm Conditions.Marine Geology, 179(1-2):121-133.doi: 10.1016/s0025-3227(01)00191-8 Wren, P.A., Leonard, L.A., 2005.Sediment Transport on the Mid-Continental Shelf in Onslow Bay, North Carolina during Hurricane Isabel.Estuarine, Coastal and Shelf Science, 63(1-2):43-56.doi: 10.1016/j.ecss.2004.10.018 Yang, D.Z., Yin, B.S., Yu, Z.M., et al., 2009.Study on the Character of Distribution of Chlorophyll-a off the Changjiang River and Its Sources of Nutrients.Acta Oceanologica Sinica, 31(1):10-19 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-SEAC200901002.htm Yang, T.N., Lee, T.Q., Meyers, P.A., et al., 2011.The Effect of Typhoon Induced Rainfall on Settling Fluxes of Particles and Organic Carbon in Yuanyang Lake, Subtropical Taiwan.Journal of Asian Earth Sciences, 40(6):1171-1179.doi: 10.1016/j.jseaes.2010.07.016 Yang, Z.S., Guo, Z.G., Wang, Z.X., et al., 1992.The Macro Pattern of Suspended Matter Transport to Eastern Deep Sea in Yellow Sea and East Sea.Acta Oceanologica Sinica, 4(2):81-90 (in Chinese). Zhao, B.R., Ren, G.F., Cao, D.M., et al., 2001.Characteristics of the Ecological Environment in Upwelling Area Adjacent to the Changing River Estuary.Oceanologia et Limnologia Sinica, 32(3):327-333 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTotal-HYFZ200103013.htm Zhou, W.H., Yuan, X.C., Huo, W.Y., et al., 2004.Distribution of Chlorophyll a and Primary Productivity in the Adjacent Sea Area of Changjiang River Estuary.Acta Oceanologica Sinica, 26(3):143-150 (in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-SEAC200403017.htm Zhu, J.R., 2003.Dynamic Mechanism of the Upwelling on the West Side of the Submerged River Valley off the Changjiang Mouth in Summertime.Chinese Science Bulletin, 48(24):2754-2758.doi: 10.1007/bf02901770 Zhu, J.R., Sheng, H.T., 1997.Mechanism of Expansion of Changjiang Diluted Water.East China Normal University Press, Shanghai (in Chinese). 胡明娜, 赵朝方, 2008.浙江近海夏季上升流的遥感观测与分析.遥感学报, 12(2): 297-304. http://www.cnki.com.cn/Article/CJFDTOTAL-YGXB200802015.htm 李小倩, 刘运德, 周爱国, 等, 2014.长江干流丰水期河水硫酸盐同位素组成特征及其来源解析.地球科学, 39(11): 1547-1554. http://earth-science.net/WebPage/Article.aspx?id=2969 苗振清, 李平, 水柏年, 1995.夏秋汛浙江渔场的水文特征.浙江水产学院学报, 14(1): 14-19. http://www.cnki.com.cn/Article/CJFDTOTAL-REEF501.002.htm 石晓勇, 李鸿妹, 王颢, 等, 2013.夏季台湾暖流的水文化学特性及其对东海赤潮高发区影响的初步探讨.海洋与湖沼, 44(5): 1208-1215. http://cdmd.cnki.com.cn/Article/CDMD-10423-2008012679.htm 杨德周, 尹宝树, 俞志明, 等, 2009.长江口叶绿素分布特征和营养盐来源数值模拟研究.海洋学报, 31(1): 10-19. http://www.cnki.com.cn/Article/CJFDTOTAL-SEAC200901002.htm 杨作升, 郭志刚, 王兆祥, 等, 1992.黄东海陆架悬浮体向其东部深海区输送的宏观格局.海洋学报, 4(2): 81-90. http://www.cnki.com.cn/Article/CJFDTOTAL-SEAC199202009.htm 赵保仁, 任广法, 曹德明, 等, 2001.长江口上升流海区的生态环境特征.海洋与湖沼, 32(3): 327-333. http://www.cnki.com.cn/Article/CJFDTOTAL-HYFZ200103013.htm 周伟华, 袁翔城, 霍文毅, 等, 2004.长江口邻域叶绿素a和初级生产力的分布.海洋学报, 26(3): 143-150. http://www.cnki.com.cn/Article/CJFDTOTAL-SEAC200403017.htm 朱建荣, 沈焕庭, 1997.长江冲淡水扩展机制.上海:华东师范大学出版社. -
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