Abstract
Satellite altimeter and in-situ tide gauge records are probably the most common means to obtain observational data for the study of changes in mean sea level. In this study, we employed these data to discuss the spatial and temporal features of regional variations in mean sea level around Taiwan. The results showed that most of the regional mean sea surface heights (SSH) around Taiwan are higher than the global mean sea surface heights. Most of the sea level trends are greater than the global mean sea level trend as well. We obtained diverse distribution results from the altimeter sea level records in neighboring areas by distributions fit, and the altimeter sea level records showed obvious inhomogene- ity. In addition, periodic fluctuations in the records regarding mean sea level were revealed in our study, based on Fourier spectra and wavelet scalograms.
Highlights
The United Nations estimates that by 2004, more than 75% of the world’s population was living within the coastal zone, and the importance of these regions extends to their influence on global economic activities [1]
The trends associated with changes in sea level have been a topic of particular concern since scientists first noticed signs of global warming
This study investigated the statistical and spectral characteristics of sea level in the regional sea areas around Taiwan, through the analysis of in-situ tide gauge and satellite altimetry records
Summary
The United Nations estimates that by 2004, more than 75% of the world’s population was living within the coastal zone, and the importance of these regions extends to their influence on global economic activities [1]. Because several million people live in coastal areas that are less than 10 meters above sea level, the features of sea level are a critical factor in the development of humankind. This study focuses on the phenomenon of long-term variations in sea level and in-situ sea level records from coastal tide stations are ideally suited to such research. Previous studies presented changes in global mean sea levels based on the Topex-Poseidon altimetry data [5,6]. A large number of studies have revealed the features of global sea level change by discussing altimeter records; the issue of regional sea level characteristics has received little attention. The aim of this study was to discuss the spatial and temporal features of variations in regional sea levels around Taiwan. Results of statistical and spectral analysis are presented in our study, to confirm the local features of sea level variation in Taiwanese waters
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