A5061605009- Climate variability and models
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Flood Risk Assessment and Management
- Hydrology and Watershed Management Studies
- Precipitation Measurement and Analysis
- Oceanographic and Atmospheric Processes
- Environmental Changes in China
- Cryospheric studies and observations
- Ocean Waves and Remote Sensing
- Aeolian processes and effects
- Environmental and Agricultural Sciences
- Water resources management and optimization
- Energy, Environment, Agriculture Analysis
- Remote Sensing and Land Use
Hanoi University of Science and Technology
2022-2024
Vietnam Academy of Science and Technology
2023-2024
Tokyo Metropolitan University
2013-2023
Hokkaido University
2017-2020
Abstract Climatological seasonal changes of rainfall and lower tropospheric circulation in around the Philippines are analysed by utilizing TRMM 3B42 to obtain 5‐day mean ERA‐Interim wind data for period 1998–2013. In particular, climatological onset withdrawal processes southwest (SW) northeast (NE) monsoon investigated. It is found that SW occurs abruptly mid‐May almost simultaneously over except southern region. The start earlier north than south. addition, a increase on west coast...
Abstract The onset dates of rainy season over the eastern Indochina Peninsula (8.5°–23.5°N, 100°–110°E) are objectively determined for individual years from 1958 to 2007 using empirical orthogonal function (EOF) analysis. On average, summer (SRS) by EOF1 is 6 May, with a standard deviation 13 days. autumn (ARS) indicated EOF2 has mean and 16 September 12 days, respectively. SRS characterized evolution monsoon westerlies northward propagation strong convection equatorial region. Conversely,...
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 60:199-213 (2014) - DOI: https://doi.org/10.3354/cr01234 projections for Vietnam based on regional climate models Thanh Ngo-Duc1,*, Chanh Kieu2, Marcus Thatcher3, Dzung Nguyen-Le4, Tan Phan-Van1 1Department of Meteorology, Hanoi College Science, National University, 10000, 2Laboratory Weather and Forecasting, 3CSIRO Marine...
ABSTRACT In this study, the climatological summer monsoon onset in Vietnam was investigated by using 25‐year situ observations and reanalysis gridded dataset recorded from 1979 to 2003. Results suggested that date varies considerably among sub‐regions. Rainfall criteria indicate earliest generally occurs northwestern mountainous area around April 25. That northern southern plains is mid‐May, along with full establishment of circulation over Indochina Peninsula. central coastal plain,...
Abstract In this study, self-organizing maps in combination with K-means clustering are used to objectively classify the anomalous weather patterns (WPs) associated summertime [May–June (MJ) and July–August–September (JAS)] heavy rainfall days during 1979–2007 over Upper Nan River basin, northwestern Thailand. The results show that MJ, intensive rains mainly brought by remarkable enhancement of westerly summer monsoon. Meanwhile, westward-propagating tropical disturbances including cyclones...
Abstract In this study, the Self‐Organizing Maps in combination with K‐means clustering technique are used for classification of synoptic weather patterns inducing heavy rainfall exceeding 100 mm day −1 during Baiu season (June–July) 1979–2010 over northern Kyushu, southwestern Japan. It suggests that these local extreme events attributed to four clustered patterns, which primarily related front and extratropical/tropical cyclone/depression activities represented by intrusion warm moist air...
When tropical cyclone (TC) 201610, namely Lionrock, was moving over the western North Pacific from southeast of Honshu to cut across Tohoku region during 29-30 August 2016, continuous and intense rainfall occurred in mid- southeastern Hokkaido, far TC center. The Weather Research Forecast (WRF) model is used investigate possible remote effect Lionrock on this heavy rain Hokkaido. National Center for Environmental Prediction (NCEP) global final (FNL) analysis provide both initial lateral...
ABSTRACT A significant delay in the autumn rainy season withdrawal ( ARSW ) along central coast of Vietnam CCV is detected since 1993, and associated dynamics are discussed. During 1979–1992, mean date was early December, which three pentads earlier than that during 1993–2006. Since rainfall over primarily produced by cold surge vortices formed interaction easterly waves with flow, characterized a gradual equatorward propagation (retreat) northeasterly winter monsoon (tropical easterlies)....
Abstract Dynamical downscaling (DDS) was conducted over Japan by using a regional atmospheric model with reanalysis data to investigate the rainfall duration bias Kyushu, Japan, in July and August from 2006 2015. The results showed that DDS had positive Kyushu dry almost all of which were emphasized for extreme events. Investigated heavy days, accompanied synoptic-scale forcing, daily precipitation exceeded 30 mm day −1 covered 20% area. Heavy days sampled observed based on rain gauge radar...
Abstract Given the importance of El Niño–Southern oscillation (ENSO) teleconnection on Southeast Asia (SEA) climate, ENSO-induced precipitation and near-surface air temperature anomalies over SEA its twenty sub-regions are compared between historical (1985–2014) future (2070–2099) simulations using 30 models from Phase 6 Coupled Model Intercomparison Project (CMIP6). Future projections suggest that Philippines, Malay Peninsula, most Maritime Continent, southern Indochina experience reduced...
Abstract The lagged teleconnections of the two types El Niño–Southern Oscillation (ENSO) on Southeast Asian autumn rainfall (SEAAR) anomalies for time varying from 12 to zero months are investigated period 1979 2019 using Singular Value Decomposition (SVD) and composite analyses. It shows that first SVD coupled modes always exhibit patterns ENSO all times. First, canonical Niño (EN) preceding induces significantly wetter SEAAR, due transition EN La Niña (LN) in following year. Thereafter,...
2016年8月の約2週間の間に4つの台風に伴う連続した豪雨によって，北海道内では年降雨量に匹敵する降雨量を記録し，甚大な災害が発生した．本研究では，被災地のひとつである石狩川水系空知川上流域において，台風10号時の降雨観測手法による降雨の時空間分布の特徴を議論した．続いて，流域内の降雨観測の空間分布に起因する流域累積雨量の不確実性についての検討を全国1級水系の235流域に展開した．さらには，対象流域において降雨観測の空間分布に起因する不確実性及び気象予測によるそれが河川流量に与える不確実性を定量化した．その結果，気象予測が与える河川流量の不確実性よりも降雨観測位置をどこに選点するかによる降雨強度のばらつきが河川流量に与える不確実性が大きいことがわかった．
Land atmosphere interaction is a one of the important factor for Atmospheric Boundary Layer (ABL) processes, including cloud and precipitation formation. The present works thus aim to estimate amount soil moisture in idealized simulation affecting shallow cumulus convection. Homogeneous horizontally homogeneous adapted. Potential occur on wetter or drier quantified by running model. Large Eddy Simulation (LES) with fully coupled land surface radiation model used different initial percentage....
北海道において線状降水帯による豪雨災害は近年増加しており，代表的な例として2014年9月に同地域で初めて大雨特別警報が発生した事例が挙げられる．本研究では，線状降水帯を形成する複数の積乱雲内の風速場を詳細に解析するため，上記事例にドップラーレーダのドップラー速度を用いた三次元風速場推定手法（the Multiple-doppler Synthesis and Conitinuity Adjustment Technique, MUSCAT法）を適用した．線状降水帯の一部では高さ6km付近において線状降水帯に直交する流入風による鉛直循環構造が見られ，流入風の風下側では強い反射強度が対流圏上層まで到達するという特徴を得た．これらの特徴は，2015年9月に鬼怒川流域で発生した平成27年の関東・東北豪雨の線状降水帯においても観察された．
本研究は過去および将来の気候において十勝川流域での洪水リスクの高い気象要因を明らかにするため，大量アンサンブル気候データを用いて各気候条件における8, 9月に発生した大雨の気象場を調べたものである．大雨発生時の気象場を自己組織化マップを用いた手法により台風を基準に分類し，各気候条件における気象場の発生割合および降雨の増加量を調べた．この結果，台風の接近事例や遠方で台風が影響する事例や台風とは無関係の事例のそれぞれが占める割合は気候条件間で多少の違いがあるものの全体的な降雨量の増大に対しては各気象場における降雨量の増大が支配的であることがわかった．また，いずれの気象場においても降雨は時空間的に集中化する結果となり，適応策の検討においては降雨量の増大および降雨の時空間特性の変化を考慮する必要性が示唆される．
Reliable information on the monsoon rainfall at finer spatiotemporal scales has always been crucial for applications in hydrometeorology, water resource management, disaster prevention, and assessment of numerical model outputs. Here, spatial-temporal characteristics summer rainy seasons worldwide are revisited using a global, high-resolution, bias-corrected satellite climate data record. The Precipitation Estimation from Remotely Sensed Information Artificial Neural Networks–Climate Data...