Description and assessment of regional sea-level trends and variability from altimetry and tide gauges at the northern Australian coast

Article


Gharineiat, Zahra and Deng, Xiaoli. 2018. "Description and assessment of regional sea-level trends and variability from altimetry and tide gauges at the northern Australian coast." Advances in Space Research. 61 (10), pp. 2540-2554. https://doi.org/10.1016/j.asr.2018.02.038
Article Title

Description and assessment of regional sea-level trends and variability from altimetry and tide gauges at the northern Australian coast

ERA Journal ID1950
Article CategoryArticle
AuthorsGharineiat, Zahra (Author) and Deng, Xiaoli (Author)
Journal TitleAdvances in Space Research
Journal Citation61 (10), pp. 2540-2554
Number of Pages15
Year2018
Place of PublicationUnited Kingdom
ISSN0273-1177
Digital Object Identifier (DOI)https://doi.org/10.1016/j.asr.2018.02.038
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0273117718301984?via%3Dihub
Abstract

This paper aims at providing a descriptive view of the lowfrequency sea level changes around the northern Australian coastline. Twenty years of sea level observations from multi-mission satellite altimetry and tide gauges are used to characterise sea level trends and
inter-annual variability over the study region. The results show that the interannual sea level fingerprint in the northern Australian coastline is closely related to El Niño Southern Oscillation (ENSO) and Madden-Julian
Oscillation (MJO) events, with the greatest influence on the Gulf Carpentaria, Arafura Sea, and the Timor Sea. The basin average of 14 tide-gauge time series is in strong agreement with the basin average of the altimeter data, with a root mean square difference of 18 mm and correlation coefficient of 0.95. The rate of sea level rise (6.3 ± 1.4 mm/yr) estimated from tide gauges is slightly higher than that (6.1 ± 1.3 mm/yr) from altimetry in the time interval 1993-2013, which can vary with the length of the time interval. Here we provide new insights into examining the significance of sea level trends by applying the non-parametric Mann-Kendall test. This test is applied to assess if the trends are significant (upward or downward). Apart from a positive rate of sea level rise, trends are not statistically significant in this region due to the effects of natural variability. The findings suggest that altimetric trends are not significant along the coasts and some parts of the Gulf Carpentaria (14°S-8°S), where geophysical corrections (e.g., ocean tides) cannot be estimated accurately and altimeter measurements are contaminated by reflections from the land.

Keywordssatellite radar altimetry, Mann-Kendall test, sea-level trend, tide gauge, Australia
ANZSRC Field of Research 2020370201. Climate change processes
419999. Other environmental sciences not elsewhere classified
370699. Geophysics not elsewhere classified
370899. Oceanography not elsewhere classified
370803. Physical oceanography
379999. Other earth sciences not elsewhere classified
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsUniversity of Newcastle
Institution of OriginUniversity of Southern Queensland
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