Analysis on the sea level anomaly high of 2012 in China coastal area
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摘要: 2012年，中国沿海海平面变化最突出的特点是海平面升高显著。海平面总体比常年高122 mm，较2011年偏高53 mm，达1980年以来最高位。本文使用中国沿海及西北太平洋区域近30 a的水位、海温、气温、气压和风等水文气象资料，详细分析了中国沿海海平面2012年异常偏高的成因。结果表明：2010-2012年中国沿海海平面处于2~3 a、8~9 a和准19 a周期震荡的高位，几个周期震荡高位叠加，对海平面上升起了明显的影响；2012年，沿海气温和海温分别较常年偏高0.4℃和0.3℃，气压较常年低1.2 hPa，气压达历史最低位；2012年，中国南海夏季风爆发时间较常年偏早，结束较常年偏晚，季风持续时间较常年偏长，导致2012年5-6月和8月，在黄海和东海海域，东北风持续偏强，南海海域南风偏强，风场的异常导致黄海、东海和南海沿海海水长时间堆积，是造成海平面升高的原因之一；2012年，热带气旋登陆时间集中，影响范围广，北上和影响东北地区的台风数量均为历史之最，特别是2012年8月，有6个热带气旋相继影响我国沿海，对当月海平面升高影响明显；另外，2012年副热带高压偏北、偏东、偏弱的特点对东海和南海的海平面上升也有一定影响。Abstract: In 2012,the sea level anomaly high was the most prominent feature of sea level change in China coastal. The sea level was 122 mm higher than normal,53 mm higher than 2011,reached its highest level since 1980. Based on the 30 years water level,sea surface temperature,air temperature,barometric pressure and wind hydrological and meteorological data,the sea level anomaly high of 2012 in the China coastal area is investigated. The research results show: the coincidence of several long-period vibration made the sea level high during 2010 to 2012. In 2012,China coastal area air temperature and ocean temperature were higher than normal,the barometric pressure was 1.2 hpa lower than normal,reaching the lowest level in history; in 2012,SCSSM time was earlier than normal,and later than normal end,the South China Sea strongest southerly wind lead China Yellow Sea,East China Sea and South China Sea coastal waters for a long time accumulation,which caused sea level rise. In 2012,tropical cyclones landing time was focus,the number of typhoons affecting a wide range of northern regions were the most of history,especially in August 2012,there were six tropical cyclones affecting China's coastal area,sea level rise for the month obviously. In addition,the subtropical high was northerly,easterly and weakness,which also have some impact on the sea level rise of the East China Sea and South China Sea in 2012.
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Key words:
- sea level rise /
- significant period /
- air pressure /
- monsoon /
- tropical cyclones
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