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Interannual sea level variability in the Pearl River Estuary and its response to El Niño–Southern Oscillation
Global and Planetary Change ( IF 4.0 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.gloplacha.2018.01.007
Linlin Wang , Qiang Li , Xian-zhong Mao , Hongsheng Bi , Peng Yin

Abstract The South China coast, especially the Pearl River Estuary (PRE) region, is prosperous and densely populated, but vulnerable to sea level changes. Sea level anomalies (SLA) during 1954–2012 from tide gauge station data and regional SLAs during 1993–2012 from satellite altimetry are analyzed and compare to the El Nino–Southern Oscillation (ENSO). Results show that sea level declines during El Nino events and rises during La Nina. Sea level in the PRE responds to ENSO with ~3–month lag. The ENSO can cause sea level in the PRE to fluctuate from −8.70 to 8.11 cm. Sea level cycles of 3 and 5 years are related to ENSO. The ENSO mechanism affecting sea level in the PRE was analyzed by identifying dominant regional and local forces. Weak/strong SLAs in most El Nino/La Nina events may be attributed to less/more seawater transport driven by anomalously weak/strong north winds and local anomalously high/low sea level pressure. Wind-driven coastal current is the predominant factor. It generated coastal seawater volume transport along a ~160 km wide cross section to decrease by 21.07% in a typical El Nino period (January 2010) and increase by 44.03% in a typical La Nina period (January 2011) as compared to an ENSO neutral situation (January 2013). Results of sea level rise and its potential mechanism provide insight for disaster protection during extreme El Nino/La Nina events.

中文翻译:

珠江口海平面年际变化及其对厄尔尼诺-南方涛动的响应

摘要 华南沿海地区,尤其是珠江口(PRE)地区,经济繁荣,人口稠密,但易受海平面变化的影响。分析了 1954-2012 年来自潮汐测量站数据的海平面异常 (SLA) 和来自卫星测高仪的 1993-2012 年区域 SLA,并与厄尔尼诺-南方涛动 (ENSO) 进行了比较。结果表明,厄尔尼诺事件期间海平面下降,拉尼娜事件期间海平面上升。PRE 中的海平面对 ENSO 的响应滞后约 3 个月。ENSO 会导致 PRE 中的海平面从 -8.70 厘米波动到 8.11 厘米。3 年和 5 年的海平面周期与 ENSO 相关。通过识别主要的区域和局部力量,分析了影响 PRE 海平面的 ENSO 机制。大多数厄尔尼诺/拉尼娜事件中的弱/强 SLA 可能归因于由异常弱/强北风和局部异常高/低海平面压力驱动的更少/更多海水运输。风力驱动的海岸流是主要因素。与 ENSO 中性相比,沿约 160 公里宽的横截面产生沿海海水量输送,在典型的厄尔尼诺时期(2010 年 1 月)减少 21.07%,在典型的拉尼娜期(2011 年 1 月)增加 44.03%情况(2013 年 1 月)。海平面上升的结果及其潜在机制为极端厄尔尼诺/拉尼娜事件期间的灾害保护提供了见解。与 ENSO 中性相比,沿约 160 公里宽的横截面产生沿海海水量输送,在典型的厄尔尼诺时期(2010 年 1 月)减少 21.07%,在典型的拉尼娜期(2011 年 1 月)增加 44.03%情况(2013 年 1 月)。海平面上升的结果及其潜在机制为极端厄尔尼诺/拉尼娜事件期间的灾害保护提供了见解。与 ENSO 中性相比,沿约 160 公里宽的横截面产生沿海海水量输送,在典型的厄尔尼诺时期(2010 年 1 月)减少 21.07%,在典型的拉尼娜期(2011 年 1 月)增加 44.03%情况(2013 年 1 月)。海平面上升的结果及其潜在机制为极端厄尔尼诺/拉尼娜事件期间的灾害保护提供了见解。
更新日期:2018-03-01
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