CONVECTION AND LOCAL CIRCULATIONS UNDER THE INFLUENCE OF MEIYU FRONT OVER NORTHERN TAIWAN

2002 ◽  
pp. 275-292 ◽  
Author(s):  
George Tai-Jen Chen
Keyword(s):  
Meiyu Front ◽  
Northern Taiwan

A Case Study of Severe Precipitation Caused by Meiyu Front in Northwest Taiwan

2020 ◽  
Author(s):  
Jou Ping Hou ◽  
Li Zhen Su ◽  
Yi Hao Liao
Keyword(s):  
High Pressure ◽  
Precipitation Event ◽  
Horizontal Wind ◽  
Northwestern Part ◽  
Mountain Range ◽  
Northern Coast ◽  
Low Level ◽  
Meiyu Front ◽  
Barrier Jets ◽  
Northern Taiwan

<p>From May to June in Southeast Asia, the cold high pressure on the mainland gradually weakens and the Pacific high pressure gradually increases. These two cold and warm pressure systems will form confrontations near Taiwan and South China. The stable "front" system is called "Meiyu front" in Taiwan. In previous studies, when the Meiyu front passed, it had the opportunity to converge with the prevailing wind field in front of the terrain in the northwestern part of Taiwan, resulting in a fast-moving airflow and the intensity of the jet, which is usually concentrated in the lower layers. It is therefore called a low-level jet. Low-level jets under certain conditions, known as barrier jets, can cause severe rainfall in northern Taiwan when they occur. The results of this study show that in the early morning of June 2, 2017, the Meiyu front approached northern Taiwan. When the main body of the front moved toward the Snow Mountain Range in northern Taiwan, a barrier jet appeared at an altitude of about 1 km. After the emergence of the barrier jets, sever precipitation occurred in Keelung and the northern coast of Taiwan in just 12 hours. Our research found that the emergence of barrier jets resulted in the increase of temperature gradients and vertical velocities in local areas; horizontal vortex tubes were twisted in the vicinity, and the horizontal wind shear on both sides of the jets enhanced the cyclonic circulation above the jets. And through the non-adiabatic effect, the stability of the release part was caused, resulting in a severe precipitation event in northern Taiwan. In this study, the observation data and model simulation results are compared with each other to analyze the main cause and physical mechanism of the severe precipitation in the northwest region in this case, and then to infer the dynamic and thermal processes of such weather phenomena over time.</p>

scholarly journals A Study on the Severe Precipitation Induced by the Meiyu Front in Taiwan

2021 ◽  
Author(s):  
Jou Ping Hou ◽  
Li-Zhen Su
Keyword(s):  
Wind Shear ◽  
Movement Speed ◽  
North Coast ◽  
Convective System ◽  
Northwestern Part ◽  
Convergence Zone ◽  
Low Level ◽  
Meiyu Front ◽  
Barrier Jets ◽  
Northern Taiwan

<p>Along the coast of northwestern Taiwan, when the Meiyu front passed, there were occasional rapids caused by the terrain, and after convergence with the prevailing wind field, it caused severe precipitation. In 1987, some studies conducted by Taiwan mesoscale experiment (TAMEX) found that low-level jet (about 1 km high) under certain conditions, known as barrier jet, strongly affected the heavy rainfall in northern Taiwan. On the morning of June 2, according to the results of the study in the Meiyu frontal contact north Taiwan, in just 12 hours later to Keelung and north coast down to the super heavy rain of reason, may be related to frontal subject in northern Taiwan snowy mountains, the enhancement of barrier jets occurring near the surface height is related to the increase in barrier jets during the movement of the frontal body. The results of this study show that when the Meiyu front moves southeast, the enhancement of the convective system on the front may cause by a larger inclination angle with its front, with appropriate movement speed, through the southwest airflow in front of the Meiyu front, especially a barrier of about 1 km in height. The warm and humid air introduced by the jet is related. Strong convection will develop in a forced convergence zone off the northwestern part of Taiwan, and the convergence zone is mainly caused by a combination of sub-synoptic forcing such as low-level wind shear convergence, barrier jets, and convective feedback of non-adiabatic terms. In addition, due to the existence of the barrier jet and the frontal wind shear zone, cyclonic circulation around the jet area was generated. With the instability of the temperature gradient and the enhancement of the abnormal zone of the positive potential vorticity, it is speculated that it should be the cause of the severe precipitation in this case. Because the biggest difference between the first and the second strong precipitation may come from the complicated topographic effect and limited space, this research focuses on the reasons for the development of the first severe weather development and heavy precipitation.</p>

Characteristics of Convections of Medium Depth to South of the Meiyu Front Analyzed by Using Numerical Simulation

SOLA ◽  
2006 ◽  
Vol 2 ◽  
pp. 160-163 ◽  
Author(s):  
Cheng-Zhong Zhang ◽  
Hiroshi Uyeda ◽  
Hiroyuki Yamada ◽  
Biao Geng
Keyword(s):  
Numerical Simulation ◽  
Meiyu Front

A Phenomenographic Analysis of College Students’ Conceptions of and Approaches to Programming Learning: Insights From a Comparison of Computer Science and Non-Computer Science Contexts

2021 ◽  
pp. 073563312199595
Author(s):  
Te-Lien Chou ◽  
Kai-Yu Tang ◽  
Chin-Chung Tsai
Keyword(s):  
College Students ◽  
Computer Science ◽  
Learning Outcomes ◽  
Approaches To Learning ◽  
Digital Age ◽  
Conceptions Of Learning ◽  
Community Interactions ◽  
Learning Programming ◽  
Northern Taiwan ◽  
Rote Memory

Programming learning has become an essential literacy for computer science (CS) and non-CS students in the digital age. Researchers have addressed that students’ conceptions of learning influence their approaches to learning, and thus impact their learning outcomes. Therefore, we aimed to uncover students’ conceptions of programming learning (CoPL) and approaches to programming learning (APL), and analyzed the differences between CS and non-CS students. Phenomenographic analysis was adopted to analyze 31 college students (20 CS-related, and 11 not) from northern Taiwan. Results revealed six categories of CoPL hierarchically: 1. memorizing concepts, logic, and syntax, 2. computing and practicing programming writing, 3. expressing programmers’ ideas and relieving pressure, 4. applying and understanding, 5. increasing one’s knowledge and improving one’s competence, and 6. seeing in a new way. Four categories of APL were also found, namely: 1. copying from the textbook, teachers, or others, 2. rote memory, 3. multiple exploration attempts, and 4. online or offline community interactions. Furthermore, we found that most CS students held higher level CoPL (e.g., seeing in a new way) than non-CS students. However, compared with non-CS students, CS students adopted more surface approaches to learning programming, such as copying and rote memory. Implications are discussed.

scholarly journals Analysis of Hydrothermal Systems Beneath Tayukeng through Long-Term Geochemical Signals of Hydrothermal Fluids in Tatun Volcano Group, Taiwan

2021 ◽  
Vol 18 (14) ◽  
pp. 7411
Author(s):  
Hsin-Fu Yeh ◽  
Hung-Hsiang Hsu
Keyword(s):  
Surface Temperature ◽  
Hydrothermal System ◽  
Hydrothermal Fluid ◽  
Thermal Water ◽  
Hydrothermal Systems ◽  
Hydrothermal Fluids ◽  
Geochemical Variations ◽  
Northern Taiwan

The Tatun Volcano Group (TVG) is located in northern Taiwan and consists of many springs and fumaroles. The Tayukeng (TYK) area is the most active fumarole site in the TVG. In this study, we analyzed the long-term geochemical variations of hydrothermal fluids and proposed a mechanism responsible for the variation in TYK. There are two different aquifers beneath the TYK area: a shallow SO42−-rich aquifer and a deeper aquifer rich in Cl−. TYK thermal water was mainly supplied by the shallow SO42−-rich aquifer; therefore, the thermal water showed high SO42− concentrations. After 2015, the inflow of deep thermal water increased, causing the Cl− concentrations of the TYK to increase. Notably, the inferred reservoir temperatures based on quartz geothermometry increased; however, the surface temperature of the spring decreased. We inferred that the enthalpy was lost during transportation to the surface. Therefore, the surface temperature of the spring does not increase with an increased inflow of deep hydrothermal fluid. The results can serve as a reference for understanding the complex evolution of the magma-hydrothermal system in the TVG.

scholarly journals The role of the geological uncertainty in a geotechnical design – A retrospective view of Freeway No. 3 Landslide in Northern Taiwan

2021 ◽  
pp. 106233
Author(s):  
Chih-Hsiang Yeh ◽  
Jia-Jyun Dong ◽  
Sara Khonevisan ◽  
C. Hsein Juang ◽  
Wen-Chao Huang ◽  
...  
Keyword(s):  
Geological Uncertainty ◽  
Retrospective View ◽  
Geotechnical Design ◽  
Northern Taiwan

Relationship Between Symptom Distress and Fatigue Characteristics in Patients with Gastric Cancer During 1 Month after Gastrectomy

2021 ◽  
pp. 105477382110352
Author(s):  
Hui-Ying Yang ◽  
Yun-Hsiang Lee ◽  
Jin-Ming Wu ◽  
I-Rue Lai ◽  
Shiow-Ching Shun
Keyword(s):  
Gastric Cancer ◽  
Longitudinal Study ◽  
Symptom Distress ◽  
Outpatient Clinics ◽  
Prospective Longitudinal Study ◽  
Fatigue Management ◽  
Negative Effect ◽  
Fatigue Characteristics ◽  
Prospective Longitudinal ◽  
Northern Taiwan

This study’s purpose was to describe changes in symptom distress and fatigue characteristics identifying which symptoms significantly impacted fatigue characteristics of patients with Gastric Cancer (GC) within 1 month after gastrectomy. A prospective longitudinal study was conducted. Patients with GC who were scheduled for gastrectomy were recruited from surgical outpatient clinics and surgery wards in northern Taiwan. Data were collected using a set of questionnaires before (T0) and 7 (T1) and 28 days (T2) after gastrectomy. Over all, 86 patients experienced mild levels of fatigue and symptom distress. The changes in worst fatigue and fatigue interference were greatest at T1. Anxiety had a significant negative effect on both worst fatigue and fatigue interference. Dry mouth, pain, and body image had significant deleterious effects on worst fatigue. The co-occurring symptoms affecting fatigue for patients with GC in the acute phase after gastrectomy should be actively assessed to ensure optimal fatigue management.

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