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

Gharineiat, Zahra and Deng, Xioali (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. ISSN 0273-1177

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Accepted version embargoed until 1 June 2019 (12 months), in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 15 Oct 2018 00:31
Last Modified: 26 Oct 2018 05:02
Uncontrolled Keywords: satellite radar altimetry, Mann-Kendall test, sea-level trend, tide gauge, Australia
Fields of Research : 04 Earth Sciences > 0401 Atmospheric Sciences > 040104 Climate Change Processes
05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
04 Earth Sciences > 0404 Geophysics > 040499 Geophysics not elsewhere classified
04 Earth Sciences > 0405 Oceanography > 040599 Oceanography not elsewhere classified
04 Earth Sciences > 0405 Oceanography > 040503 Physical Oceanography
04 Earth Sciences > 0499 Other Earth Sciences > 049999 Earth Sciences not elsewhere classified
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960307 Effects of Climate Change and Variability on Australia (excl. Social Impacts)
D Environment > 96 Environment > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified
Identification Number or DOI: 10.1016/j.asr.2018.02.038
URI: http://eprints.usq.edu.au/id/eprint/34808

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