Characteristics and Long-Term Variability of Occurrences of Storm Surges in the Baltic Sea
Abstract
:1. Introduction
- the filling-up of the Baltic Sea—the initial sea level prior to the occurrence of an extreme event. (Water exchange between the North Sea and the Baltic Sea, accomplished via the Danish Straits, is the main driver of changes in water volume and the average sea level—that is, the filling of the basin. This exchange depends on local wind and pressure conditions over the North Atlantic and the Baltic Sea and on the North Sea water level [4]. The largest inflows of water into the Baltic Sea occur during extended periods characterized by sustained western winds, which lead to the filling-up of the Baltic Sea and suppress water outflow. This may lead the Baltic Sea to rise up to several tens of centimeters above mean sea level [2])
- the action of tangential wind stresses within the given area (wind directions: whether they are shore- or seaward, wind velocities, and the duration of wind action),
- the deformation of the sea surface by mesoscale deep low-pressure systems rapidly crossing the Baltic Sea, which produces a water cushion (baric wave) and generates seiche-like variations of the Baltic Sea level. A water cushion is a surge of water caused by subpressure associated with a low-pressure system, resulting from the inverse barometer effect (a 1 hPa drop in pressure in the depression center increases the sea level by 1 cm).
2. Materials and Methods
2.1. Research Material
2.2. Description of the Storm Event
- pi—pressure at the center of the low pressure area (hPa),
- VL—average speed of the low pressure area (m/s),
- initial sea level (cm) (the sea level prior to the occurrence of an extreme event),
- extreme values of the sea level (maximum and minimum level) during the surge and their amplitude (cm),
- rates of the maximum sea-level rise and fall (cm/h),
- duration of ≥70 cm and ≥100 cm sea levels and ≤−70 cm and ≤−100 cm sea levels (relative to tide gauge zero).
2.3. Visualization of Changes in the Baltic Sea Surface during a Storm Situation in ArcGIS
2.4. Research on Trends of Extreme Sea Levels and Storm Surges
3. Results and Discussion
3.1. Types of Storm Surges in the Baltic Sea
- A wind-driven storm surge occurs when over the course of several days, a wind field exerts an influence on the sea surface, with stable wind direction and high wind velocity causing evident drift currents. Such wind field may arise in the case of shallow and slow-moving low-pressure systems (pressure at the center >980 hPa, velocity <16 m/s). Tangential wind action not only produces waves but also contributes energy to the formation of a sloping water surface, so-called wind-driven surge. The magnitude of sea level surge or sea level lowering depends not only on wind velocity, but also on its duration, direction, wind distances over sea surface, and compensating currents in the coastal zone.
- A subpressure-driven storm surge occurs when a mesoscale, concentric, and deep (≤980 hPa at the center) low-pressure area moves at relatively high velocity (≥16 m/s) over or in close proximity to the Baltic Sea. This causes a deformation to the Baltic Sea surface via the so-called water cushion of a low pressure area, which moves in an oscillatory manner along the low-pressure area trajectory and the adjacent sub-basins. A water cushion, also termed a baric wave, is a surge of water caused by subpressure (just like ocean waters surge underneath a tropical cyclone). Such inverse barometer effect over the sea surface is characterized by positive ordinates in the central area and negative ordinates along the deformation periphery. If a baric wave moves at a velocity equal to or approximating the progressive velocity of the low-pressure area, a serious flooding hazard occurs at a given section of the coast, and so-called seiche-like oscillations may arise.
3.1.1. Wind-Driven Storm Surge Example
Synoptic Situation
Western Baltic
Danish Straits
Southern Baltic
Central and Northern Baltic
The Gulf of Finland and the Gulf of Riga
The Gulf of Bothnia
Wind-Driven Storm Surge Event—A Summary
3.1.2. An Example of a Storm Situation with the Main Part Played by the Subpressure of an Active Low-Pressure Area
Synoptic Situation
Western Baltic
Danish Straits
Southern Baltic
Northern and Central Baltic
The Gulf of Finland and the Gulf of Riga
The Gulf of Bothnia
Storm Surge Driven by Subpressure of an Active Low-Pressure System—A Summary
3.1.3. Characteristic Features of Storm Surges in the Baltic Sea
- An active mechanism of dynamic inclination of the sea level from the balance state via a mesoscale low pressure system moving at a velocity of about 16 m/s and higher; its activity causes a deformation to the Baltic Sea surface via the so-called water cushion (baric wave) and oscillatory fashion of the propagation of such deformation along the track of the low pressure area and the adjacent sub-basins;
- A characteristic phenomenon of alternating sea level oscillations between southwestern and northeastern sub-basins of the Baltic Sea. A mesoscale depression simultaneously lowers the sea level in the south and raises the sea level in the north, following which, in a matter of hours, the Baltic Sea surface table slope becomes reversed. Such water mass movements can be termed seiche oscillations of the entire Baltic Sea.
- Wind has no high significance for subpressure-driven storm surges and may at most contribute to sustaining a extreme sea level;
- Storm surges generated by subpressure associated with a low pressure area begin with a large sea level decrease at tide gauging stations in the Western Baltic;
- The narrow range of sea level oscillations (20–50 cm) at the Visby station (Central Baltic) during storm situations corroborates that this tide gauge is located on the nodal line of a Baltic seiche;
- In the case of surges caused by a dynamic low-pressure area, the maximum rate of sea level change equals on average from 10 to 40 cm/h or more. The fastest sea level rises and drops occur at tide gauges located within bays and straits.
- Wind-driven surges last relatively long (48 to 72 h); during this time, drift currents transfer water mass, thus forming a so-called coastal wind surge.
- The maximum rate of sea level change is usually lower than in the case of surges caused by a dynamic low-pressure area and equals on average from 5 to 25 cm/h. Notably, however, the rate of sea level drop is usually slightly slower than the rate of increase (gravity- driven decrease).
- In the case of eastern or northern atmospheric circulation, and the presence of an expanded anticiclonic system over Scandinavia or western Russia, storm surges occur only in southwestern sub-basins of the Baltic Sea. In such cases, tide gauging stations located within these sub-basins do not record a sea level drop (i.e., there is no negative phase of the surge).
- When a maximum sea level is attained during a wind-driven surge at a given tide gauging station, wind direction exerts a stronger forcing than wind velocity. A weaker wind blowing more perpendicular relative to the coast will cause a higher wind-driven surge and will cause the maximum to be attained sooner than in the case of a stronger wind blowing at a lower angle relative to the coast.
3.2. Changes in High Sea Levels and Storm Surges from 1960 to 2020
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Tide Gauge | Features of the Low Pressure System | Recorded Sea Level | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
pi (hPa) | VL (m/s) | Initial Sea Level (cm) | Max. (cm) | Min. (cm) | Amplitude (cm) | The Maximum Rate of Sea Level Change (cm/h) | Duration of Sea Level (h) | |||||
Rise | Fall | ≥ | ≤ | |||||||||
70 cm | 100 cm | −70 cm | −100 cm | |||||||||
Kørsor | 1004 | 7.77 | −6 | 69 | −16 | 85 | 11 | 9 | ||||
Wismar | 16 | 140 | 0 | 140 | 13 | 11 | 30 | 18 | ||||
Skanör | 1 | 84 | −2 | 86 | 8 | 9 | 5 | |||||
Świnoujście | 8 | 110 | 8 | 102 | 12 | 9 | 30 | 10 | ||||
Kungsholmsfort | 3 | 47 | −5 | 52 | 5 | 4 | ||||||
Visby | 2 | 7 | −14 | 21 | 2 | 3 | ||||||
Ristna | 2 | 2 | −42 | 44 | 2 | 3 | ||||||
Pärnu | 12 | 13 | −77 | 90 | 8 | 8 | 9 | |||||
Hamina | 6 | 6 | −50 | 56 | 5 | 5 | ||||||
Kemi | −6 | −6 | −52 | 46 | 3 | 4 |
Tide Gauge | Features of the Low Pressure System | Recorded Sea Level | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
pi (hPa) | VL (m/s) | Initial Sea Level (cm) | Max. (cm) | Min. (cm) | Amplitude (cm) | The Maximum Rate of Sea Level Change (cm/h) | Duration of Sea Level (h) | |||||
Rise | Fall | ≥ | ≤ | |||||||||
70 cm | 100 cm | −70 cm | −100 cm | |||||||||
Kørsor | 963 | 17.5 | 25 | 67 | −35 | 108 | 13 | 15 | 2 | |||
Wismar | −46 | 65 | −96 | 161 | 22 | 11 | 12 | |||||
Skanör | 25 | 35 | −100 | 135 | 23 | 19 | 7 | |||||
Świnoujście | 17 | 41 | −77 | 118 | 16 | 15 | 4 | |||||
Kungsholmsfort | 17 | 34 | −51 | 85 | 11 | 9 | ||||||
Visby | 15 | 31 | 6 | 25 | 6 | 6 | ||||||
Ristna | 16 | 109 | 16 | 93 | 26 | 19 | 9 | 7 | ||||
Pärnu | 78 | 129 | 30 | 99 | 15 | 29 | 26 | 8 | ||||
Hamina | 50 | 121 | 11 | 110 | 16 | 16 | 20 | 6 | ||||
Kemi | 30 | 92 | −26 | 118 | 12 | 11 | 28 |
Station | Trend in Duration of High Sea Levels ≥ 70 cm (hours) | Trends in Number of Storm Surges | Trend in the Height of Maximum Annual Sea Levels | |
---|---|---|---|---|
(cm/year) | (cm) | |||
Kørsor—Danish Straits | 28 → 25 | 3.3 → 3.7 | 0.23 | 93 → 103 |
Wismar—Western Baltic | 58 → 78 | 4.0→ 7.1 | 0.36 | 115→ 136 |
Kungsholmsfort—Southern Baltic | 15 → 17 | 1.2 → 1.4 | 0.17 | 74 → 84 |
Władysławowo—Southern Baltic | 23→ 58 | 1.7 → 3.3 | 0.48 | 79→ 107 |
Visby—Central Baltic | 2 → 2 | - | 0.02 | 54 → 55 |
Ristna—Northern Baltic | 47 → 67 | 2.5 → 3.6 | 0.43 | 88 → 113 |
Pärnu—Gulf of Riga | 212 → 220 | 7.3 → 11.2 | 0.13 | 139 → 147 |
Hamina—Gulf of Finland | 116 → 182 | 5.5→ 11.5 | 0.33 | 110 → 130 |
Vasaa—Gulf of Bothnia | 73 → 74 | 1.0→ 2.9 | 0.32 | 78→ 97 |
Kemi—Gulf of Bothnia | 136→ 259 | 4.8→ 9.7 | 0.29 | 119 → 134 |
Total Baltic Sea | 71 → 98 | 3.1 → 5.5 | 0.28 | 95 → 111 |
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Wolski, T.; Wiśniewski, B. Characteristics and Long-Term Variability of Occurrences of Storm Surges in the Baltic Sea. Atmosphere 2021, 12, 1679. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos12121679
Wolski T, Wiśniewski B. Characteristics and Long-Term Variability of Occurrences of Storm Surges in the Baltic Sea. Atmosphere. 2021; 12(12):1679. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos12121679
Chicago/Turabian StyleWolski, Tomasz, and Bernard Wiśniewski. 2021. "Characteristics and Long-Term Variability of Occurrences of Storm Surges in the Baltic Sea" Atmosphere 12, no. 12: 1679. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos12121679