论文部分内容阅读
珊瑚环礁上唯一的陆地是由未固结的礁源砂和砾组成的规模很大且低矮的岛屿。一般认为,由于温室效应的影响,珊瑚环礁极易沉没于迅速上升的海平面之下。此外,环礁表面现存的地貌形态,在晚全新世已经形成,那么就可以利用这些岛屿对海平面变化模式进行评估,以判断海平面是稳定型,还是上升型(礁被淹没),或者是下降型(礁露出水面)。如果晚全新世历史反映的是环礁出露,那么反过来可以证明在过去几百年或几千年间海平面曾经超出环礁出露的高度;而另外两种模式,就不会出现这种现象。
The only land on the Coral Atoll is a large and low-lying island of unconsolidated reef-derived sand and gravel. Coral atolls are generally believed to sink easily under rapidly rising sea levels due to the greenhouse effect. In addition, the existing topography of the surface of the atolls was formed in the late Holocene, so these islands could be used to assess sea level change patterns to determine whether the sea level is stable or uplifting (the reefs are submerged) or Descending type (reef surface). If Late Holocene history reflects the appearance of atolls, it can in turn prove that the sea level had exceeded the level at which the atolls had been exposed for centuries or millennia; and the other two models did not Kind of phenomenon