Satellite Observation of the Mesoscale Features in the Taiwan Strait

2006 ◽  
Author(s):  
Nan-Jung Kuo ◽  
Chung-Ru Ho ◽  
Shih-Jen Huang
Keyword(s):  
Shear Wave ◽  
Feature Tracking ◽  
Cold Water ◽  
Phase Speed ◽  
Satellite Observation ◽  
Taiwan Strait ◽  
Infrared Images ◽  
The Taiwan Strait ◽  
Monsoon Winds ◽  
Kinematic Properties

In this paper, we discuss the kinematic properties of the mesoscale features in the Taiwan Strait (TS). Two kinds of mesoscale features can be seen in the TS. One is the shear wave; it is a lateral wavelike train with phase speed and wave period. The other one is the eddy-like cold-water wedge; it mainly rotates with a little translation. The shear wave mainly occurs in the boundary of the China cold water along the western TS in winter and spring. The eddy-like cold-water wedge can be seen in the mid-winter when the strong southward China coastal cold water covers up most of the northern TS and creates a very unstable front with the northward warm water. In this study, selected NOAA satellite AVHRR channel 4 infrared images during 2000–2003 are considered to detect the movement of the above mesoscale features through a feature-tracking method. It is found that the development of these features is highly related to the monsoon winds. Meanwhile, the local tidal pattern can also affect their movements.

Cross Flows in the Taiwan Strait in Winter*

2014 ◽  
Vol 44 (3) ◽  
pp. 801-817 ◽  
Author(s):  
L.-Y. Oey ◽  
Y.-L. Chang ◽  
Y.-C. Lin ◽  
M.-C. Chang ◽  
S. Varlamov ◽  
...  
Keyword(s):  
Cold Water ◽  
Numerical Models ◽  
Taiwan Strait ◽  
Finite Amplitude ◽  
Winter Monsoon ◽  
Coastal Current ◽  
Wind Regime ◽  
Calanus Sinicus ◽  
Northeasterly Wind ◽  
The Taiwan Strait

Abstract In winter, a branch of the China Coastal Current can turn in the Taiwan Strait to join the poleward-flowing Taiwan Coastal Current. The associated cross-strait flows have been inferred from hydrographic and satellite data, from observed abundances off northwestern Taiwan of cold-water copepod species Calanus sinicus and, in late March of 2012, also from debris found along the northwestern shore of Taiwan of a ship that broke two weeks earlier off the coast of China. The dynamics related to such cross flows have not been previously explained and are the focus of this study using analytical and numerical models. It is shown that the strait’s currents can be classified into three regimes depending on the strength of the winter monsoon: equatorward (poleward) for northeasterly winds stronger (weaker) than an upper (lower) bound and cross-strait flows for relaxing northeasterly winds between the two bounds. These regimes are related to the formation of the stationary Rossby wave over the Changyun Ridge off midwestern Taiwan. In the weak (strong) northeasterly wind regime, a weak (no) wave is produced. In the relaxing wind regime, cross-strait currents are triggered by an imbalance between the pressure gradient and wind and are amplified by the finite-amplitude meander downstream of the ridge where a strong cyclone develops.

scholarly journals Exceptionally cold water days in the southern Taiwan Strait: their predictability and relation to La Niña

2018 ◽  
Author(s):  
Yu-Hsin Cheng ◽  
Ming-Huei Chang
Keyword(s):  
Wind Speed ◽  
Cold Water ◽  
Warning System ◽  
Taiwan Strait ◽  
La Niña ◽  
Relative Operating Characteristic ◽  
Technology System ◽  
La Nina ◽  
Extreme Hazards ◽  
The Taiwan Strait

Abstract. The objectives of this study were to assess the predictability of exceptionally cold water in the Taiwan Strait (TS) and to develop a warning system on the base of scientific mechanism, which is a component of the information technology system currently under development in Taiwan to protect aquaculture against extreme hazards. Optimum interpolation sea surface temperature (SST) data were used to find exceptionally cold water days from January 1995 to May 2017. We found that the SST and wind speed over the TS are low and strong in La Niña winters, respectively. According to tests conducted using relative operating characteristic curves, predictions based on the Oceanic Niño Index and integrated wind speed can be employed at lead times of 60–210 and 0–30 days, respectively. This study utilized these two proxies to develop a possible warning mechanism and concluded four colors of warning light: (1) blue, meaning normal; (2) cyan, meaning warning; (3) yellow, meaning moderate risk; and (4) red, meaning high risk. Hindcasting winters over the period 1995–2017 successfully predicted the cold water hazards in the winters of 2000, 2008, 2011, and 2012 in prior to the coldest day ~ 20 days.

scholarly journals Exceptionally cold water days in the southern Taiwan Strait: their predictability and relation to La Niña

2018 ◽  
Vol 18 (7) ◽  
pp. 1999-2010 ◽  
Author(s):  
Yu-Hsin Cheng ◽  
Ming-Huei Chang
Keyword(s):  
Wind Speed ◽  
Cold Water ◽  
Warning System ◽  
Taiwan Strait ◽  
La Niña ◽  
Occurrence Probability ◽  
Relative Operating Characteristic ◽  
Technology System ◽  
La Nina ◽  
The Taiwan Strait

Abstract. The objectives of this study were to assess the predictability of exceptionally cold water in the Taiwan Strait (TS) and to develop a warning system on the basis of the scientific mechanism, which is a component of the information technology system currently under development in Taiwan to protect aquaculture against extreme hazards. Optimum interpolation sea surface temperature (SST) data were used to find exceptionally cold water days from January 1995 to May 2017. We found that the SST and wind speed over the TS are low and strong in La Niña winters, respectively. According to tests conducted using relative operating characteristic curves, predictions based on the Oceanic Niño Index and integrated wind speed can be employed at lead times of 60–120 and 0–25 days, respectively. This study utilized these two proxies to develop a possible warning mechanism and concluded four colors of warning light: (1) blue, meaning normal (0 % occurrence probability); (2) cyan, meaning warning (∼ 50 % occurrence probability); (3) yellow, meaning moderate risk (∼ 60 % occurrence probability); and (4) red, meaning high risk (∼ 75 % occurrence probability). Hindcasting winters over the period 1995–2017 successfully predicted the cold water hazards in the winters of 2000, 2008, and 2011 prior to the coldest day by ∼ 20 days.

scholarly journals Land-Ocean Interaction Affected by the Monsoon Regime Change in Western Taiwan Strait

2021 ◽  
Vol 8 ◽  
Author(s):  
Rick J. Yang ◽  
James T. Liu ◽  
Chih-Chieh Su ◽  
Yi Chang ◽  
Jimmy J. Xu ◽  
...  
Keyword(s):  
Regime Change ◽  
Taiwan Strait ◽  
Coastal Current ◽  
China Sea ◽  
Specific Time Point ◽  
Mass Properties ◽  
Western Side ◽  
The Taiwan Strait ◽  
Monsoon Winds ◽  
Current Systems

The Taiwan Strait is a conduit between East China Sea (ECS) and South China Sea (SCS). Seasonal monsoon winds drive the southbound Zhejiang-Fujian Coastal Current and northbound SCS Warm Current through the strait. Water masses carried by these major current systems also carry fluvial signals from two major rivers, the Changjiang (Yangtze) River in ECS and the Zhujiang (Pearl) River in SCS through the strait. Here we show a switch occurred to signify the monsoon regime change on the western side of this conduit around 10:00 on May 8, 2015. Our data came from water mass properties and environmental proxies of N/P ratio in the surface water and 7Be and 210Pbex isotopes in surface sediments. The timings of the demarcation were identical in the water column and on the water-sediment interface. Our findings put a specific time point in the monsoon regime change in 2015.

A Stranding Record of Omura’s Whale (Balaenoptera omurai Yamada, 2003) in the Taiwan Strait, China

2017 ◽  
Vol 43 (3) ◽  
pp. 289-298 ◽  
Author(s):  
Min Xu ◽  
Xianyan Wang ◽  
Xing Miao ◽  
Fuxing Wu ◽  
Mu Ma ◽  
...  
Keyword(s):  
Taiwan Strait ◽  
The Taiwan Strait
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