Tidal and residual currents in the Qiongzhou Strait estimated from shipboard ADCP data using a modified tidal harmonic analysis method

Zhu, Xiao‐Hua; Ma, Yun-Long; Guo, Xinyu; Fan, Xiangtao; Yu, Lushan; Yuan, Yaochu; Xuan, Jiliang; Huang, Daji

doi:10.1002/2014jc009855

Cited by 27 publications

(18 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results agree with the more recent current meter mooring data collected at several stations and at different times (Chen et al, 2006;Chen et al, 2007;Yan et al, 2008), repeat shipboard ADCP data (Zhu et al, 2014), drifting bottle data (Yang et al, 2003;Bao et al, 2005), and numerical studies (Chen et al, 2009). However, synchronous data measurements to directly probe the spatial structure of the tidal and residual currents and the resulting volume transport through the strait have not yet been performed.…”

Section: / 35supporting

confidence: 88%

“…Based on different observations, i.e., non-synchronous data, the volume transport due to residual currents in the QS have been estimated as 0.2-0.4 Sv in winter and spring (Shi et al, 2002), 0.055 Sv (Chen et al, 2007), 0.020-0.048 Sv (Yan et al, 2008), and 0.065 Sv (Zhu et al, 2014). Although these estimates vary in magnitude, they are consistently directed westward.…”

Section: Comparisons With Previous Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of tidal and residual currents and volume transport through the Qiongzhou Strait using coastal acoustic tomography

Zhu

Guo

et al. 2015

Continental Shelf Research

Self Cite

View full text Add to dashboard Cite

Section: / 35supporting

confidence: 88%

Section: Comparisons With Previous Studiesmentioning

confidence: 99%

Measurement of tidal and residual currents and volume transport through the Qiongzhou Strait using coastal acoustic tomography

Zhu

Guo

et al. 2015

Continental Shelf Research

Self Cite

View full text Add to dashboard Cite

“…Based on the observations from Shi et al (2002), the flow in the Qiongzhou Strait is westward year round, with volume transports of approximately 0.2-0.4 Sv during winter and spring and 0.1-0.2 Sv during summer and autumn. Recently, observations from Zhu et al (2014Zhu et al ( , 2015 show that the transport of the Qiongzhou Strait is approximately −0.021-−0.111 Sv in spring (negative values refer to the westward transport). The model with tidal forcings simulates a transport of −0.084 Sv in spring and −0.21 Sv in winter, which is close to the observations, indicating that the model run with tidal forcings is reliable.…”

Section: Model Validationmentioning

confidence: 99%

Tidal Effects on the Surface Water Cooling Northeast of Hainan Island, South China Sea

Curchitser

Wang

et al. 2020

JGR Oceans

View full text Add to dashboard Cite

Using a 3-D high-resolution ocean model, this paper explores the mechanisms that cause surface and subsurface water cooling northeast of Hainan Island during summer. Results show that two cooling centers in the regions east of Wenchang city and east of the Qiongzhou Strait occur when tides are included in the model. The cooling is primarily caused by large-scale changes in the circulation in the northwestern South China Sea (SCS) through anomalous horizontal pressure gradients caused by inhomogeneous tidal mixing between the near-shore and offshore regions. East of Wenchang city, the offshore tidal currents induce upwelling that brings the near-bottom cold water to the subsurface. For the region east of the Qiongzhou Strait, the tidally induced westward anomalous currents suppress the warm water transport from Qiongzhou Strait, resulting in a compensating intrusion of cold water from surrounding regions. In addition to the large-scale circulation changes, the local tidal mixing also contributes to the subsurface water cooling east of the Qiongzhou Strait by mixing near-bottom cold water with subsurface waters. Interannually, the cooling weakens or intensifies during different (cold or warm) phases of the El Niño-Southern Oscillation (ENSO) events. This is attributed to variability in surface forcings and large-scale circulation associated with different phases of ENSO leading to changes in stratification, which changes the tidally induced horizontal pressure gradient in the northwestern SCS. Plain Language Summary The surface water cooling around the eastern and northern coast of Hainan Island is one of the strongest in the South China Sea (SCS). During summer, strong surface water cooling occurs northeast of the island, which is associated with tidal effects. Variable tidal mixing between the coastal region and the open ocean changes the pressure gradient, which results in significant changes in the circulation in the northwestern SCS leading to cooling of the surface waters. On the interannual scale, the sea water cooling induced by tides northeast of Hainan Island weakens (enhances) during the cold (warm) phases of El Niño-Southern Oscillation (ENSO) events.

show abstract

“…The LCOs for the other tidal constituent pairs were all small. These results indicate that the tidal constituent pairs P 1 / K 1 , S 2 / K 2 , and M 2 / S 2 cannot be adequately separated, and thus we tried to infer P 1 from O 1 , and S 2 and K 2 from M 2 tidal constituents, based on the P 1 / O 1 , S 2 / M 2 , and K 2 / M 2 amplitude ratios and their phase differences calculated from sea level data at three tide gauge stations over the TkS [ Foreman et al ., ; Zhu et al ., ]. We also tried to remove the M 2 and S 2 constituents by fitting the ADCP data using the averaged frequency of M 2 and S 2 ; however, we could not improve the results significantly.…”

Section: Tidal Harmonic Analysismentioning

confidence: 99%

Tidal currents and Kuroshio transport variations in the Tokara Strait estimated from ferryboat ADCP data

et al. 2017

Self Cite

View full text Add to dashboard Cite

From 2003 to 2011, current surveys, using an acoustic Doppler current profiler (ADCP) mounted on the Ferry Naminoue, were conducted across the Tokara Strait (TkS). Resulting velocity sections (1234) were used to estimate major tidal current constituents in the TkS. The semidiurnal M2 tidal current (maximum amplitude 27 cm s−1) was dominant among all the tidal constituents, and the diurnal K1 tidal current (maximum amplitude 21 cm s−1) was the largest among all the diurnal tidal constituents. Over the section, the ratios, relative to M2, of averaged amplitudes of M2, S2, N2, K2, K1, O1, P1, and Q1 tidal currents were 1.00:0.44:0.21:0.12:0.56:0.33:0.14:0.10. Tidal currents estimated from the ship‐mounted ADCP data were in good agreement with those from the mooring ADCP data. Their root‐mean‐square difference for the M2 tidal current amplitude was 2.0 cm s−1. After removing the tidal currents, the annual‐mean of the net volume transport (NVT) through the TkS ± its standard derivation was 23.03 ± 3.31 Sv (Sv = 106 m3 s−1). The maximum (minimum) monthly mean NVT occurred in July (November) with 24.60 (21.47) Sv. NVT values from the ship‐mounted ADCP were in good agreement with previous geostrophic volume transports calculated from conductivity temperature depth data, but the former showed much finer temporal structure than those from the geostrophic calculation.

show abstract

Tidal and residual currents in the Qiongzhou Strait estimated from shipboard ADCP data using a modified tidal harmonic analysis method

Cited by 27 publications

References 18 publications

Measurement of tidal and residual currents and volume transport through the Qiongzhou Strait using coastal acoustic tomography

Measurement of tidal and residual currents and volume transport through the Qiongzhou Strait using coastal acoustic tomography

Tidal Effects on the Surface Water Cooling Northeast of Hainan Island, South China Sea

Tidal currents and Kuroshio transport variations in the Tokara Strait estimated from ferryboat ADCP data

Contact Info

Product

Resources

About