Observational Analysis of Tidal Effect on Sea Breeze

Lee, Younghee

doi:10.1007/s10546-021-00621-5

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…On the study day, low tide occurred at 17:00 LST. Lee showed that sea-breeze intensity at this site decreases early when low tide occurs in the afternoon [16]. Low tide in the afternoon may also contribute to less cooling by sea breeze being observed after 15:00 LST than in the simulation, because the air blows from exposed mud and shallow water.…”

Section: Down-valley Wind and Sea Breeze At Bswomentioning

confidence: 81%

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High-Resolution Modeling of Mesoscale Circulation in the Atmospheric Boundary Layer over a Complex Coastal Area

Lim

Lee

2021

Atmosphere

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We evaluated the performance of the high-resolution (333 m) Weather Research and Forecasting (WRF) model in simulating the flow structure at a complex coastal site in Boseong, South Korea, on 15 July 2018, against observations obtained from a 300 m tower and radiosonde, and analyzed the model results to interpret the measurements. The study site is surrounded by mountains, valleys, and bays, and is adjacent to the South Sea; thus, it is influenced by terrain-forced flow and thermally driven circulation. The study day was characterized by the development of nighttime low-level wind maximum (LLWM) and daytime sea breeze under weak synoptic wind conditions. Although the WRF model simulated the onset and cessation of a sea breeze later than was observed, it showed good skill in reproducing the near-surface temperatures, wind vectors, and vertical profiles of potential temperatures and wind vectors in the atmospheric boundary layer at the study site. We analyzed the model results at 05:30 and 14:30 LST when the model’s performance was good for wind. At 05:30 LST, hydraulic jump produced weak wind conditions below 300 m above ground level (AGL), and westerly down-valley flow developed near the surface, leading to an LLWM. At 14:30 LST, heating over land produced a thermal high over land at 1800 m AGL, counteracting the synoptic pressure gradient, and leading to weak wind conditions at this level. We performed three sensitivity simulations to examine the dependence of flow structure on the horizontal and vertical resolution. The results show that an early-morning hydraulic jump can be simulated by applying a high-resolution model in both the horizontal and vertical grids, and the simulated onset and cessation times of the sea breeze depend on the model’s resolution. The dependence of flow structure on the model resolution has been discussed.

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Section: Down-valley Wind and Sea Breeze At Bswomentioning

confidence: 81%

“…The site faces Deungnyang Bay to the southeast; the distance to the bay is ~1.5 km. The bay includes tidal flats that are ~1.2 km wide [16]. The Goheung Peninsula and the South Sea are located to the south of the bay; therefore, this site is influenced by both bay and sea breezes during the daytime.…”

Section: Site Description and Observationsmentioning

confidence: 99%

High-Resolution Modeling of Mesoscale Circulation in the Atmospheric Boundary Layer over a Complex Coastal Area

Lim

Lee

2021

Atmosphere

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“…A connection between tides and the sea breeze has been observed (Lee 2021) and modelled in previous studies (Kessler et al 1985;Fischereit et al 2016). In these studies, connections were made with changes to the surface roughness length and thermal balance that accompanies exposure of large intertidal regions and the consequent changes in the sea breeze.…”

Section: Introductionmentioning

confidence: 91%

The effect of water currents on wind drag – a case study of tidal currents and sea breeze in a semi-enclosed embayment

Thurgate

2023

J. South. Hemisph. Earth Syst. Sci.

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The details of how energy and momentum are exchanged at the interface between ocean surface and the atmosphere is complex and the subject of new and more complete models. The need to improve models of how wind interacts with oceans is driven in part by the growth of offshore wind farms, and the need to predict their likely performance. The geographic features of Shark Bay allow several of the factors affecting the influence of currents on wind speed to be separated and analysed. Shark Bay is the largest semi-enclosed embayment on the Australian coast. It is tidal and aligned north-south in the direction of the sea breeze. The prevailing southerly wind, and the absence of openings to the ocean in the south of the bay, limits the fetch of waves, providing waves of predictable age in the bay with an absence of longer wavelength swell. The sea breeze in this region is characterised among the strongest and most reliable anywhere in the world. Although the tide heights are not large, the geography of the bay ensures strong tidal currents. Hence Shark Bay provides an excellent opportunity to study the effects of currents on winds. This study demonstrates that the effects of the tidal current are apparent in the wind speed record. It shows that simply subtracting a 29-day running average of the particular time of day from the wind speed reveals the effect of an incoming or outgoing tide. Time-series analysis of this outcome shows the periodicity and modulation of the tides. The analysis is further improved through using the Weather Research and Forecasting (WRF) code and subtracting its predictions from the raw data. Time-series analysis of the outcome demonstrates that the resultant difference has two diurnal and two semi-diurnal components with the correct periods and amplitudes of the known tidal variations in that region of Shark Bay. Hence the neglect of the interaction between water currents and wind stress is demonstrated to produce a systematic deviation in the predictions of the WRF from the measured wind values for Shark Bay.

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Influence of tidal state on air temperature through penetrating sea breeze front in Seoul in summer

Lee

2023

Meteorol Atmos Phys

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Observational Analysis of Tidal Effect on Sea Breeze

Cited by 3 publications

References 11 publications

High-Resolution Modeling of Mesoscale Circulation in the Atmospheric Boundary Layer over a Complex Coastal Area

High-Resolution Modeling of Mesoscale Circulation in the Atmospheric Boundary Layer over a Complex Coastal Area

The effect of water currents on wind drag – a case study of tidal currents and sea breeze in a semi-enclosed embayment

Influence of tidal state on air temperature through penetrating sea breeze front in Seoul in summer

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