Characteristics and possible causes of sea level anomalies in the Xisha sea area
-
摘要: 本文使用风、海流、海温以及卫星高度计资料详细分析了西沙周边海域海平面异常变化的特征及成因。分析结果表明:(1)自1993年以来,西沙周边海域海平面在1998年、2001年、2008年、2010年和2013年海平面较常年偏高明显,其中,1998年和2010年存在显著的年际异常升高,2010海平面较常年高13.2cm,达到历史最高。2010年6-8月,该海域海平面升幅达43cm,超过该海域海平面年变幅的2倍。(2)该海域海平面在明显上升的同时,还存在较显著的9a、2-3a和4-7a的周期性波动,说明该海域海平面的变化除了受到天体引潮力的影响外,还与热带西太平洋季风在该海域准2a的周期性震荡以及ENSO事件密切相关。(3)进一步分析发现,西沙周边海域海平面变化与ENSO事件存在显著的负相关关系,该海域海平面异常升高均发生在拉尼娜事件的前期;该海域海平面与Nino4和Nino3.4滞后2个月和3个月的相关系数分别为-0.46和-0.45,均超过95%的显著性检验。(4)2010年海平面异常升高期间,正处于2010/2011年拉尼娜事件的前期,西沙周边海域风场异常;同期,25米层海流在该海域形成一较强的顺时针涡旋,流速接近黑潮在吕宋海峡附近速度,在该区域涡旋的存在对海面高度变化的贡献高达80%;西沙周边海域在常年为一冷涡,2010年7-8月,该海域海温较2009年同期偏高2-3℃,温度变化引起的比容海平面的变化对海平面高度变化起了一定的作用。Abstract: Based on the analysis of wind, ocean currents, sea surface temperature (SST) and remote sensing satellite altimeter data, the characteristics and possible causes of sea level anomalies in the Xisha sea area are investigated. The main results are shown as follows:(1) Since 1993, the sea level in the Xisha sea area was obviously higher than normal in 1998, 2001, 2008, 2010 and 2013. Especially, the sea level in 1998 and 2010 was abnormally high, and the sea level in 2010 was 13.2 cm higher than the muti-year mean, which was the highest in the history. In 2010, the sea level in the Xisha sea area had risen 43 cm from June to August, with the strength twice the annual variation range. (2) The sea level in the Xisha sea area was not only affected by the tidal force of the celestial bodies, but also closely related to the quasi 2 a periodic oscillation of tropical western Pacific monsoon and ENSO events. (3) There was a significant negative correlation between sea level in the Xisha sea area and ENSO events. The high sea level anomaly all happened during the developing phase of La Ni.a. They also show significant negative correlations with Niño 4 and Niño 3.4 indices, and the lag correlation coefficients for 2 months and 3 months are -0.46 and -0.45, respectively. (4) During the early La Ni.a event form June to November in 2010, the anomalous wind field was cyclonic. A strong clockwise vortex was formed for the current in 25 m layer in the Xisha sea area, and the velocity of the current is close to the speed of the Kuroshio near the Luzon Strait. In normal years, there is a "cool eddy". While in 2010, from July to August, the SST in the area was 2-3℃ higher than that of the same period in the history.
-
Key words:
- Xisha sea area /
- sea level anomalies /
- ENSO /
- wind /
- current /
- SST
-
Chen Shangji,Ma Jirui.1991.Marine Data Processing Analysis Methods and Their Applications (in Chinese).Beijing:China Ocean Press,312-318 Chen Changlin,Wang Guihua.2014.Interannual variability of the eastward current in the western South China Sea associated with the summer Asian monsoon.Journal of Geophysical Research:Oceans,119(9):5745-5754,doi: 10.1002/2014JC010309 Chen Yongli,Zhao Yongping,Feng Junqiao,et al.2012.ENSO cycle and climate anomaly in China.Chinese Journal of Oceanology and Limnology,30(6):985-1000 Chen Yongli,Zhao Yongping,Wang Fan.2013.ENSO and the Marine Environment and Climate Anomalies of China (in Chinese).Beijing:Science Press,23-25 Chu Xiaoqing,Xue Huijie,Qi Yiquan,et al.2014.An exceptional anticyclonic eddy in the South China Sea in 2010.Journal of Geophysical Research:Oceans,119(2):881-897,doi: 10.1002/2013JC009314 Ding Rongrong,Zuo Juncheng,Du ling,et al.2007.Sea level change in the South China Sea and its relations to the steric height variation and wind.Periodical of Ocean University of China (in Chinese),37(Sup Ⅱ):23-30 Fang Guohong,Zheng Wenzhen,Chen Zongyong,et al.1986.Analys is and Forecast of Tidal and Current (in Chinese).Beijing:China Ocean Press,268-281 Farge M.1992.Wavelet transforms and their applications to turbulence.Annual Review of Fluid Mechanics,24(1):395-458 Huang Ronghui,Chen Wen,Ding Yihui,et al.2003.Studies on the monsoon dynamics and the interaction between monsoon and ENSO cycle.Chinese Journal of Atmospheric Sciences (in Chinese),27(4):484-502 Intergovernmental Panel on Climate Change (IPCC).2013.Climate Change 2013:The Physical Science Basis.Contribution of Working Group I to the Fifth Assessment Report of the intergovernmental Panel on Climate Change.Cambridge:Cambridge University Press Lau K M,Weng Hengyi.1995.Climate signal detection using wavelet transform:how to make a time series sing.Bulletin of the American Meteorological Society,76(12):2391-2402 Li Li.2014.The meridional sea level oscillation of the China seas and the Gulf of Thailand.Haiyang Xuebao (in Chinese),36(9):7-17 Lin Pengfei,Wang Fan,Chen Yongli,et al.2007.Temporal and spatial variation characteristics on eddies in the South China Sea I. Statistical analyses.Haiyang Xuebao (in Chinese),29(3):14-22 Liu Qinyu,Liu Zhengyu,Pan Aijun.2006.Conceptual model about the interaction between El Niño/Southern Oscillation and Quasi-Biennial Oscillation in far west equatorial Pacific.Science in China Series D:Earth Science,49(8):889-896 Liu Qinyu,Xie Shangping,Zheng Xiaotong.2013.Tropical Ocean-Atmosphere Interaction (in Chinese).Beijing:Higher Education Press,9 Rong Zengrui,Liu Yuguang,Zong Haibo,et al.2007.Interannual sea level variability in the South China Sea and its response to ENSO.Global and Planetary Change,55(4):257-272 State Oceanic Administration.2012.2011 Bulletin of the sea level of China (in Chinese).Beijing:State Oceanic Administration State Oceanic Administration.2013.2012 Bulletin of the sea level of China (in Chinese).Beijing:State Oceanic Administration Wang Hui,Fan Wenjing,Li Yan,et al.2012.Analysis on sea level anomaly in the coastal area of Bohai Sea and Yellow Sea in February.Marine Science Bulletin (in Chinese),31(3):255-261 Wang Hui,Liu Kexiu,Fan Wenjing,et al.2013.Data uniformity revision and variations of the sea level of the western Bohai Sea.Marine Science Bulletin (in Chinese),32(3):256-264 Wang Hui,Liu Kexiu,Fan Wenjing,et al.2014.Analysis on the sea level anomaly high of 2012 in China coastal area.Haiyang Xuebao(in Chinese),36(5):8-17 Webster P J,Yang S.1992.Monsoon and ENSO:selectively interactive systems.Quarterly Journal of the Royal Meteorological Society, 118(507):877-926 Xie Shangping,Xie Qiang,Wang Dongxiao,et al.2003.Summer upwelling in the South China Sea and its role in regional climate variations.Journal of Geophysical Research:Oceans,108(C8):doi: 10.1029/2003JC001867 Xu Haiming,Wang Linwei,He Jinhai.2008.Observed oceanic feedback to the atmosphere over the kuroshio Extension during spring time and its possible mechanism.Chinese Science Bulletin, 53(12):1905-1912 Yamagata T,Shibao Y,Umatanit S I.1985.Interannual variability of the Kuroshio Extension and its relation to the Southern Oscillation/El Niño.Journal of the Oceanographical Society of Japan, 41(4):274-281 Yu Yifa.2004.Advance of the researches on the variations of meansea-level (MSL) in the coastal waters of China.Periodical of Ocean University of China (in Chinese),34(5):713-719 Zervas C E.2009.Sea level variations of the United States,1854-2006.Silever Spring,MD:US Department of Commerce,National Oceanic and Atmospheric Administration Zuo Juncheng,Zhang Jianli,Du Ling,et al.2009.Global sea level change and thermal contribution.Journal of Ocean University of China,8(1):1-8
点击查看大图
计量
- 文章访问数: 1873
- HTML全文浏览量: 48
- PDF下载量: 471
- 被引次数: 0