气候变化领域集成服务门户(CCPortal): Multi-temporal shoreline change rates on Taku Atoll

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.848457
	Multi-temporal shoreline change rates on Taku Atoll
	Mann; Thomas; Bayliss-Smith; Tim; Westphal; Hildegard
发布日期	2016-07-24
数据集类型	dataset
英文简介	Recent-past shoreline changes on reef islands are now subject to intensified monitoring via remote sensing data. Based on these data, rates of shoreline change calculated from long-term measurements (decadal) are often markedly lower than recent short-term rates (over a number of years). This observation has raised speculations about the growing influence of sea-level rise on reef island stability. This observation, however, can also be explained if we consider two basic principles of geomorphology and sedimentology. For Takú Atoll, Papua New Guinea, we show that natural shoreline fluctuations of dynamic reef islands have a crucial influence on the calculation of short-term rates of change. We analyze an extensive dataset of multitemporal shoreline change rates from 1943 to 2012 and find that differing rates between long- and short-term measurements consistently reflect the length of the observation interval. This relationship appears independent from the study era and indicates that reef islands were equally dynamic during the early periods of analysis, i.e. before the recent acceleration of sea-level rise. Consequently, we suggest that high rates of shoreline change calculated from recent short-term observations may simply result from a change in temporal scale and a shift from geomorphic equilibrium achieved over cyclic time towards an apparent disequilibrium during shorter periods of graded time. This new interpretation of short- and long-term shoreline change rates has important implications for the ongoing discussion about reef island vulnerability, showing that an observed jump from low to high rates of change may be independent from external influences, including but not limited to sea-level rise.
空间范围	Latitude: -4.766370 * Longitude: 157.032230
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/216990
推荐引用方式 GB/T 7714	Mann,Thomas,Bayliss-Smith,et al. Multi-temporal shoreline change rates on Taku Atoll.2016-07-24.https://doi.org/10.1594/PANGAEA.848457.