Spatial variations in the Caspian Sea wave climate in 2002-2013 from satellite altimetry
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ID: 283287
2019
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Abstract
The core properties of the wave climate and its changes in the Caspian Sea
are established in terms of the annual mean significant wave height and its
regional changes in 2002-2013 based on the outcome of the satellite altimetry
mission JASON-1. Remotely estimated wave heights are validated against
properties of the empirical distribution of instrumentally measured wave
heights in the southern Caspian Sea and monthly averages of visually observed
wave heights at three locations. A correction for systematic differences leads
to very good correspondence between monthly averaged in situ and satellite data
with a typical root mean square difference of 0.06 m. The average significant
wave height in the Caspian Sea is 0.5-0.7 m in the northern basin of the sea,
around 1.2 m in large parts of the central and southern basins and reaches up
to 1.8 m in the northern segment of the central basin. The basin-wide average
wave intensity varied insignificantly in the range of 1.02-1.14 m in 2002-2013.
These estimates overestimate the wave heights by about 30% because low wave
conditions are ignored. Substantial and statistically significant changes in
the wave height occurred in certain areas. The wave height decreased by 0.019
+- 0.007 m/yr in the eastern segment of the central basin and by 0.04 +- 0.04
m/yr in the western segment of the southern basin. These changes can be
explained by an increase in the frequency of westerly winds at the expence of
southerly winds. Both basin-wide and regional extreme wave heights exhibit
large interannual variations but do not show any significant trend. The
patterns of changes in mean and extreme wave height are different. The average
wave height has increased while the extreme wave height has decreased in the
eastern segment of the southern basin.
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| Authors | Nadezhda Kudryavtseva; Kuanysh Kussembayeva; Zaure B. Rakisheva; Tarmo Soomere |
| Journal | arXiv |
| Year | 2019 |
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