Estimates of vertical land motion along the southwestern coasts of Turkey from coastal altimetry and tide gauge data

Yıldız, Hasan; Andersen, Ole; Simav, Mehmet; Aktuğ, Bahadır; Özdemir, Soner Mehmet

doi:10.1016/j.asr.2012.11.011

Cited by 17 publications

(13 citation statements)

References 26 publications

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“…Several authors investigated surface subsidence at Antalya‐II for different periods using different techniques. Yildiz et al () pointed out that the Global Positioning System (GPS)‐derived subsidence rate was −3.6 ± 1.7 mm/year (1994–2009), agreeing with previous estimates of −3.6 ± 0.3 mm/year (1985–2001; Yildiz & Demir, ). Using satellite altimetry, vertical crustal deformation is estimated as the difference between measured land and sea surface heights at the tide gauge.…”

Section: Datasupporting

confidence: 73%

“…Fenoglio‐Marc et al () used this method to derive a surface subsidence of −3.0 ± 1.6 mm/year (1993–2001) at Antalya‐II. Yildiz et al () obtained similar altimetry‐derived VLM rates for 1993–2009. These decadal rates of surface subsidence are higher than the longer‐term average (Seseogullari et al, ), and Anzidei et al () reconstructed that the mean tectonic subsidence rate of Turkey's southwestern coast between Cnidos and Kekova was −1.5 ± 0.3 mm/year over the past 2,300 years.…”

Section: Datamentioning

confidence: 71%

“…Large‐scale atmospheric modes over the North Atlantic and Europe such as the North Atlantic Oscillation (NAO) also influence sea level independent on seasons (Gomis et al, ; Martínez‐Asensio et al, ; Tsimplis & Shaw, ; Tsimplis et al, ). Sea‐level time series also need to be corrected for vertical surface displacements due to glacial isostatic adjustment (GIA; Peltier et al, ), and volcanic or tectonic uplift or subsidence (Bouin & Wöppelmann, ; Santamaría‐Gómez et al, ; Wahl et al, ) to obtain absolute sea‐level variations (Yildiz et al, ). GIA has a minor effect on geocentric sea levels in the Mediterranean Basin (Peltier, ; Spada & Galassi, ); the effect diminishes toward the southern and eastern coasts (Stocchi & Spada, ; Tsimplis et al, ).…”

Section: Motivationmentioning

confidence: 99%

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A New Centennial Sea‐Level Record for Antalya, Eastern Mediterranean

et al. 2018

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Quantitative estimates of sea-level rise in the Mediterranean Basin become increasingly accurate thanks to detailed satellite monitoring. However, such measuring campaigns cover several years to decades, while longer-term sea-level records are rare for the Mediterranean. We used a data archeological approach to reanalyze monthly mean sea-level data of the Antalya-I (1935Antalya-I ( -1977 tide gauge to fill this gap. We checked the accuracy and reliability of these data before merging them with the more recent records of the Antalya-II (1985-2009) tide gauge, accounting for an eight-year hiatus. We obtain a composite time series of monthly and annual mean sea levels spanning some 75 years, providing the longest record for the eastern Mediterranean Basin, and thus an essential tool for studying the region's recent sea-level trends. We estimate a relative mean sea-level rise of 2.2 ± 0.5 mm/year between 1935 and 2008, with an annual variability (expressed here as the standard deviation of the residuals, σ residuals = 41.4 mm) above that at the closest tide gauges (e.g., Thessaloniki, Greece, σ residuals = 29.0 mm). Relative sea-level rise accelerated to 6.0 ± 1.5 mm/year at Antalya-II; we attribute roughly half of this rate (~3.6 mm/year) to tectonic crustal motion and anthropogenic land subsidence. Our study highlights the value of data archeology for recovering and integrating historic tide gauge data for long-term sea-level and climate studies.Plain Language Summary We demonstrate how data archeology of tide gauge data contributes to completing the contemporary century sea-level record in the eastern Mediterranean Basin. It is important to rescue such data and to make them available for future research on sea-level rise that goes beyond modern and highly accurate satellite-based monitoring. In our particular case, the monthly mean sea-level records of Antalya-I (1935Antalya-I ( -1977, we merged them with the modern records of Antalya-II (1985-2009) located only~5 km away. This merger offers a homogeneous composite time series of monthly and annual mean sea level of nearly 75 years, the longest record in the eastern Mediterranean Basin. We reviewed all previous work, metadata, and changes in the zero of tide gauges and datum. Major issues included obtaining the leveling information and to determine rates of tectonic vertical crustal movement. It is worth noting that nearly half of the observed sea-level rise in Antalya-II is driven by local vertical land motion, which might be influenced heavily by anthropogenic sources.

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Section: Datasupporting

confidence: 73%

Section: Datamentioning

confidence: 71%

Section: Motivationmentioning

confidence: 99%

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A New Centennial Sea‐Level Record for Antalya, Eastern Mediterranean

et al. 2018

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“…Tide gauge measurements in the 20th century (1900 to 2009) indicated that the mean rate of sea level rise was 1.6-1.8 mm·year −1 [3,4]. Tide gauge measurements have some limitations due to their density of distribution, local impacts and are particularly affected by vertical land movements such as land subsidence [5,6].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Altimetric Range and Geophysical Corrections and Mean Sea Surface Models—Impacts on Sea Level Variability around the Indonesian Seas

2017

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Abstract:The focus of this study is the assessment of the main range and geophysical corrections needed to derive accurate sea level time series from satellite altimetry in the Indonesia seas, the ultimate aim being the determination of sea level trend for this region. Due to its island nature, this is an area of large complexity for altimetric studies, a true laboratory for coastal altimetry. For this reason, the selection of the best corrections for sea level anomaly estimation from satellite altimetry is of particular relevance in the Indonesian seas. The same happens with the mean sea surface adopted in the sea level anomaly computation due to the large gradients of the mean sea surface in this part of the ocean. This study has been performed using altimetric data from the three reference missions, TOPEX/Poseidon, Jason-1 and Jason-2, extracted from the Radar Altimeter Database System. Analyses of sea level anomaly variance differences, function of distance from the coast and at altimeter crossovers were used to assess the quality of the various corrections and mean sea surface models. The selected set of corrections and mean sea surface have been used to estimate the sea level anomaly time series. The rate of sea level rise for the Indonesian seas was found to be 4.2 ± 0.2 mm/year over the 23-year period (1993-2015).

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“…A major limitation of the current approach is that the present regional network of GPS stations was sparse and data were only available during 1994-2004, which causes high uncertainty in the geocentric rate derived from tide gauges. In the case of missing data, VLM can be inversely estimated from the difference between the sea level change rates measured by satellites and tide gauges (Fenoglio-Marc et al, 2012;Yildiz et al, 2013), but more vertical motion observations (e.g. IOC, 2012) and improved technique to compute the VLM observed from different GPS locations and during different time frames at the sites of tide stations are needed to enhance this approach.…”

Section: Long-term Sea Level Trendmentioning

confidence: 99%

Sea level trend and variability around Peninsular Malaysia

2015

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Abstract. Sea level rise due to climate change is nonuniform globally, necessitating regional estimates. Peninsular Malaysia is located in the middle of Southeast Asia, bounded from the west by the Malacca Strait, from the east by the South China Sea (SCS), and from the south by the Singapore Strait. The sea level along the peninsula may be influenced by various regional phenomena native to the adjacent parts of the Indian and Pacific oceans. To examine the variability and trend of sea level around the peninsula, tide gauge records and satellite altimetry are analyzed taking into account vertical land movements (VLMs). At annual scale, sea level anomalies (SLAs) around Peninsular Malaysia on the order of 5-25 cm are mainly monsoon driven. Sea levels at eastern and western coasts respond differently to the Asian monsoon: two peaks per year in the Malacca Strait due to South Asian-Indian monsoon; an annual cycle in the remaining region mostly due to the East Asian-western Pacific monsoon. At interannual scale, regional sea level variability in the range of ±6 cm is correlated with El Niño-Southern Oscillation (ENSO). SLAs in the Malacca Strait side are further correlated with the Indian Ocean Dipole (IOD) in the range of ± 5 cm. Interannual regional sea level falls are associated with El Niño events and positive phases of IOD, whilst rises are correlated with La Niña episodes and negative values of the IOD index. At seasonal to interannual scales, we observe the separation of the sea level patterns in the Singapore Strait, between the Raffles Lighthouse and Tanjong Pagar tide stations, likely caused by a dynamic constriction in the narrowest part.During the observation period 1986-2013, average relative rates of sea level rise derived from tide gauges in Malacca Strait and along the east coast of the peninsula are 3.6 ± 1.6 and 3.7 ± 1.1 mm yr −1 , respectively. Correcting for respective VLMs (0.8 ± 2.6 and 0.9 ± 2.2 mm yr −1 ), their corresponding geocentric sea level rise rates are estimated at 4.4 ± 3.1 and 4.6 ± 2.5 mm yr −1 . The geocentric rates are about 25 % faster than those measured at tide gauges around the peninsula; however, the level of uncertainty associated with VLM data is relatively high. For the common period between 1993 and 2009, geocentric sea level rise values along the Malaysian coast are similar from tide gauge records and satellite altimetry (3.1 and 2.7 mm yr −1 , respectively), and arguably correspond to the global trend.

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Estimates of vertical land motion along the southwestern coasts of Turkey from coastal altimetry and tide gauge data

Cited by 17 publications

References 26 publications

A New Centennial Sea‐Level Record for Antalya, Eastern Mediterranean

A New Centennial Sea‐Level Record for Antalya, Eastern Mediterranean

Assessment of Altimetric Range and Geophysical Corrections and Mean Sea Surface Models—Impacts on Sea Level Variability around the Indonesian Seas

Sea level trend and variability around Peninsular Malaysia

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