Application of the Altimetry Data to the Analysis of Water Balance of the Black Sea

Goryachkin, Yu. N.; Ivanov, Vitalii; Lemeshko, E. M.; Lipchenko, M. M.

doi:10.1023/b:poce.0000013232.31952.a9

Cited by 7 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The improvement in the coastal areas of the Mediterranean Sea has recently been demonstrated by Marcos et al (2015). A reasonable agreement between tide gauge records and near-coast SLAs in the Black Sea has also been documented (Volkov and Landerer, 2015;Korotaev et al, 1998;Stanev et al, 2000Goryachkin et al, 2003;Avsar et al, 2015).…”

Section: Methodsmentioning

confidence: 78%

“…Based on satellite altimetry measurements during 1993-2010, the global and the Black Sea MSL then rose at a faster rate of ∼ 3.1 mm yr −1 (Church et al, 2013;Avsar et al, 2015). Both the tide gauge and altimetry records show that sea level trends in the Black Sea are not constant over time (e.g., Goryachkin and Ivanov, 2006;Kubryakov and Stanichnyi, 2013): MSL was rising at a very high rate of ∼ 28 mm yr −1 in 1993-1999 (Ducet et al, 1999;Stanev et al, 2000;Cazenave et al, 2002;Goryachkin et al, 2003;Vigo et al, 2005;Yildiz et al, 2008), and then it began to fall by ∼ 3 mm yr −1 in 1999-2007 (Ginzburg et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantifying the impact of basin dynamics on the regional sea level rise in the Black Sea

2017

View full text Add to dashboard Cite

Abstract. Satellite altimetry measurements show that the magnitude of the Black Sea sea level trends is spatially uneven. While the basin-mean sea level rise from 1993 to 2014 was about 3.15 mm yr −1 , the local rates of sea level rise varied from 1.5-2.5 mm yr −1 in the central part to 3.5-3.8 mm yr −1 at the basin periphery and over the northwestern shelf and to 5 mm yr −1 in the southeastern part of the sea. We show that the observed spatial differences in the dynamic sea level (anomaly relative to the basin-mean) are caused by changes in the large-and mesoscale dynamics of the Black Sea. First, a long-term intensification of the cyclonic wind curl over the Black Sea, observed in 1993-2014, strengthened divergence in the center of the basin and led to the rise of the sea level in coastal and shelf areas and a lowering in the basin's interior. Second, an extension of the Batumi anticyclone to the west resulted in ∼ 1.2 mm yr −1 higher rates of sea level rise in the southeastern part of the sea. Further, we demonstrate that the large-scale dynamic sea level variability in the Black Sea can be successfully reconstructed using the wind curl obtained from an atmospheric reanalysis. This allows for the correction of historical tide gauge records for dynamic effects in order to derive more accurate estimates of the basin-mean sea level change in the past, prior to the satellite altimetry era.

show abstract

Section: Methodsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Quantifying the impact of basin dynamics on the regional sea level rise in the Black Sea

2017

View full text Add to dashboard Cite

show abstract

“…Many authors show the good quality of altimetry-derived geostrophic velocities all over the world. In the Black Sea, altimetry data were validated earlier using tide gauges, drifters, and hydrological data in a series of studies [6][7][8][9][10][11][12][13][14].…”

Section: Discussionmentioning

confidence: 99%

“…These data are widely used in different oceanographic studies, which provide a lot of new insights about large and mesoscale ocean dynamics all over the world [3][4][5]. In the Black Sea region, altimetry data were validated using tide gauges, drifters, hydrology, and satellite imagery data in a series of studies [6][7][8][9][10][11][12][13][14], which show its good capability for reconstructing sea level and current velocity. Altimetry data were used to investigate mechanisms driving the Black Sea's large [7,15], and mesoscale dynamics [16][17][18][19], their seasonal and interannual variability [12,18,20], and their impact on the basin ecosystem [18,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Large- and Mesoscale Dynamics in the Black Sea Region from Satellite Imagery and Altimetry Data—A Comparison of Two Methods

2018

View full text Add to dashboard Cite

Two remote sensing methods, satellite altimetry and 4D-Var assimilation of satellite imagery, are used to compute surface velocity fields in the Black Sea region. Surface currents derived from the two methods are compared for several cases with intense mesoscale and large-scale dynamics during low wind conditions. Comparison shows that the obtained results coincide well quantitatively and qualitatively. However, satellite imagery provides more reasonable results on the spatial variability of coastal dynamics than altimetry data. In particular, this is related to the reconstruction of eddy coastal dynamics, such as Black Sea near-shore anticyclones. Current streamlines in these eddies are not closed near the coast in altimetry data, which we relate to the extrapolation during mapping procedure in the absence of coastal along-track measurements. On the other hand, in offshore areas, imagery-derived currents can be underestimated due to the absence of thermal contrasts and smoothing during the procedure of the 4D-Var assimilation. Wind drift currents are another source of inconsistency, as their impact is directly observed in satellite imagery but absent in altimetry data. The advantage of the 4D-Var method for reconstructing coastal dynamics is used to compute surface currents in the Marmara Sea on the base of 250 m resolution Modis optical data. The results reveal the very complex dynamics of the basin, with a large number of mesoscale and sub-mesoscale eddies. 4D-Var assimilation of Modis imagery is used to obtain information about dynamic characteristics of these small eddies with radiuses of 4-10 km.

show abstract

“…Coastal erosion has been identified as one of the major problems for the Black Sea beaches (Demirkesen et al, 2009;Kosyan et al, 2012). Estimates show that an increase of sea level by 1 cm results in 1-2 meters of coastal erosion (Goryachkin and Ivanov, 2006). An increase of sea level by 50 cm will reduce the area of the Black Sea beaches by approximately 50% (Allenbach et al, 2015).…”

mentioning

confidence: 99%

Effects of the basin dynamics on sea level rise in the Black Sea

Kubryakov

Stanichny

Volkov

2016

Preprint

View full text Add to dashboard Cite

Abstract. Satellite altimetry measurements show that magnitude of the Black Sea level trends is spatially uneven. While the basin-averaged sea level was increasing at a rate of 3.15 mm/year from 1993 to 2014, the sea level rise varied from 0.15–2.5 mm/year in the central part to 3.5–3.8 mm/year in coastal areas and 5 mm/year in the southwestern part of the sea. These differences are caused by changes in the large- and mesoscale circulation of the Black Sea. A long-term increase of the cyclonic wind curl over the basin from 1979 to 2014 strengthened divergence in the center of the Black Sea that led to an increase of sea level near the coast and a decrease in the center of the basin. Changes in the distribution and intensity of mesoscale eddies caused the formation of the local extremes of sea level trend. The variability of the dynamic sea level (DSL) – the difference between the local and the basin-averaged sea levels – contributes significantly (up to ~ 50 % of the total variance) to the seasonal and interannual variability of sea level in the basin. The DSL variability in the Black Sea depends strongly on the basin-averaged wind curl and is well reconstructed using the ERA-Interim winds from 1979 to present, including the time when altimetry data was unavailable. The reconstruction can be used to correct historical tide gauges data for dynamic effects, which are usually neglected in the analysis of the Black Sea tide gauge records.

show abstract

Application of the Altimetry Data to the Analysis of Water Balance of the Black Sea

Cited by 7 publications

References 1 publication

Quantifying the impact of basin dynamics on the regional sea level rise in the Black Sea

Quantifying the impact of basin dynamics on the regional sea level rise in the Black Sea

Reconstructing Large- and Mesoscale Dynamics in the Black Sea Region from Satellite Imagery and Altimetry Data—A Comparison of Two Methods

Effects of the basin dynamics on sea level rise in the Black Sea

Contact Info

Product

Resources

About