基本情報

所属
環境情報科学講座
職位
教授
E-Mail
saji@u-aizu.ac.jp
Webサイト
http://enformtk.u-aizu.ac.jp/

教育

担当科目 - 大学
コンピュータリテラシー
担当科目 - 大学院
High Performance Computing, Numerical Ocean-Atmosphere Modeling using OpenCL, Computational Fluid Dynamics

研究

研究分野
気候力学
略歴
インド理科大学院 博士(大気科学)
現在の研究課題
GPS meteorology, Climate dynamics
研究内容キーワード
Numerical Modeling, Super El Nino, Indian Ocean Dipole, Sensor network, Machine Learning
所属学会
American Geophysical Union, Japan Geophysical Union

パーソナルデータ

趣味
子供時代の夢
これからの目標
座右の銘
愛読書
学生へのメッセージ
その他

主な研究

Analysing Climate data with Machine Learning Algorithms

Analyze climate data using self organizing maps

この研究を見る

Tracking Clouds and Rain with low cost GPS chips

GPS (Global Positioning System)は測位・航法の技術として最も使われています。同時に、GPS信号は科学技術へも応用されています。
その一つが雨雲の追跡です。この技術は、大気中の水蒸気によってGPS信号は遅延を受けるという事実に基づいています。研究室では、
低コストのGPSチップによる雨雲の追跡技術を探求しています。この研究は福島再生可能エネルギー研究所(http://www.aist.go.jp/fukushima/)との共同研究でもあります。高性能・低性能を含むいくつかの受信機はFREAに設置済みです。研究はそれらの受信機で得られたデータの相互比較、
そして水蒸気量を雨雲へマッピングする機械学習アルゴリズムの開発を含みます。

この研究を見る

Indian Ocean Dipole

The Indian Ocean Dipole is a climate phenomenon that affects global climate. It is an irregular oscillation with positive and negative phases. In the positive phase, sea surface temperatures of the eastern Indian Ocean experience unusual cooling. This is soon followed by a warming of sea surface temperatures in the western Indian Ocean. These changes lead to a large shift in rainfall from the eastern towards the western Indian Ocean, and is consequently associated with drought in the eastern and floods in the western Indian Ocean.

We study the mechanisms by which the Indian Ocean Dipole is generated using computer models. Areas of research include Indian Ocean Dipole dynamics, its impacts on global climate and how it interacts with the El Nino Southern Oscillation.

この研究を見る

Super El Nino

What processes are responsible for Super El Ninos are explored using computational modeling approaches.

この研究を見る

環境情報の管理と予測のための計算

〇この研究の目的は、コンピュータサイエンスと情報技術とを駆使して、自然環境との共存を意識しながら、快適な、そして便利な、かつ持続可能な社会を実現することです。その一環として私たちは最先端の計算技術を用いて福島県、特に会津地方の天候と気候を正確にシミュレーションし、予報することを試みます。

〇これにより、悪天候により受ける被害を低く抑え、また、有利な気象条件を最大限に利用することが可能となるでしょう。情報技術を革新的に利用する方法を検討し、環境情報をより良く理解し、かつ最大限に利用出来る社会の実現を目指します。環境のモニタリングと管理のための安価でスマートな多機能なセンサーを開発することも私たちの計画に含まれています。

この研究を見る

主な著書・論文

1.Title: A dipole mode in the tropical Indian Ocean
Author(s): Saji, N. H.; Goswami, B. N.; Vinayachandran, P. N.; et al.
Source: Nature Volume: 401 Pages: 360-363 Published: 1999
Times Cited: 1582
DOI: 10.1038/43855
added
24-May-10
2.Title: Possible Impacts of Indian Ocean Dipole Mode events on global climate
Author(s): Saji, N. H.; Yamagata, T.
Source: Climate Research Volume: 25 Pages: 151-169 Published: 2003
Times Cited: 259
DOI: 10.3354/cr025151
added
24-May-10
3.Title: Individual and combined influences of ENSO and the Indian Ocean Dipole on the Indian Summer Monsoon
Author(s): Ashok, K.; Guan, Z.; Saji, N. H.; et al.
Source: Journal of Climate Volume: 17 Pages: 3141-3155 Published: 2004
Times Cited: 145
DOI: 10.1175/1520-0442(2004)0172.0.CO;2
added
24-May-10
4.Title: Structure of SST and surface wind variability during Indian Ocean Dipole Mode events : COADS observations
Author(s): Saji, N. H.; Yamagata, T.
Source: Journal of Climate Volume: 16 Pages: 2735-2751 Published: 2003
Times Cited: 131
DOI: 10.1175/1520-0442(2003)0162.0.CO;2
added
24-May-10
5.Title: Role of Narrow Mountains in Large Scale Organization of Asian Monsoon Convection
Author(s): Xie, S. P.; Xu, H.; Saji, N. H.; et al.
Source: Journal of Climate Volume: 19 Pages: 3420-3429 Published: 2006
Times Cited: 108
DOI: 10.1175/JCLI3777.1
added
24-May-10
6.Title: Response of the equatorial Indian Ocean to an unusual wind event during 1994
Author(s): Vinayachandran, P. N.; Saji, N. H.; Yamagata, T.
Source: Geophysical Research Letters Volume: 26 Pages: 1613-1616 Published: 1999
Times Cited: 102
DOI: 10.1029/1999GL900179
added
24-May-10
7.Title: Tropical Indian Ocean Variability in the IPCC 20th-century climate simulations
Author(s): Saji, N. H.; Xie, S. P.; Yamagata, T.
Source: Journal of Climate Volume: 19 Pages: 4397-4417 Published: 2006
Times Cited: 78
DOI: 10.1175/JCLI3847.1
added
24-May-10
8.Title: Comments on "Dipoles, Temperature Gradients, and Tropical Climate Anomalies"
Author(s): Yamagata, T.; Behera, S. K.; Rao, S. A.; et al.
Source: Bulletin of the American Meteorological Society Volume: 84 Pages: 1418-1422 Published: 2003
Times Cited: 53
DOI: 10.1175/BAMS-84-10-1418
added
24-May-10
9.Title: Comments on "A Cautionary Note on the Interpretation of EOFs"
Author(s): Behera, S. K.; Rao, S. A.; Saji, N. H.; et al.
Source: Journal of Climate Volume: 16 Pages: 1087-1093 Published: 2003
Times Cited: 42
DOI: 10.1175/1520-0442(2003)0162.0.CO;2
added
24-May-10
10.Title: Satellite observations of intense intraseasonal cooling events in the tropical south Indian Ocean
Author(s): Saji, N. H.; Xie, S. P.; Tam, C. Y.
Source: Geophysical Research Letters Volume: 33 Published: 2006
Times Cited: 35
DOI: 10.1029/2006GL026525
added
24-May-10
11.Title: Indian Ocean Dipole Mode events and austral surface temperature anomalies
Author(s): Saji, N. H.; Ambrizzi, T.; Ferraz, S. E. T.
Source: Dynamics of Atmospheres and Oceans Volume: 39 Pages: 87-101 Published: 2005
Times Cited: 33
DOI: 10.1016/j.dynatmoce.2004.10.015
added
24-May-10
12.Title: Processes and boreal summer impacts of the 2004 El Nino Modoki: An AGCM study
Author(s): ASHOK, K; IIZUKA, S; RAO, SA; et al.
Source: GEOPHYSICAL RESEARCH LETTERS Volume: 36 Published: 2009
Times Cited: 25
DOI: 10.1029/2008GL036313
added
29-Jul-09
13.Title: Mechanisms of South Indian Ocean intraseasonal cooling
Author(s): VINAYACHANDRAN, PN; SAJI, NH
Source: GEOPHYSICAL RESEARCH LETTERS Volume: 35 Issue: 23 Published: 2008
Times Cited: 21
DOI: 10.1029/2008GL035733
added
28-Jul-09
14.Title: On the impacts of ENSO and Indian Ocean dipole events on sub-regional Indian summer monsoon rainfall
Author(s): ASHOK, K; SAJI, NH
Source: NATURAL HAZARDS Volume: 42 Issue: 2 Pages: 273-285 Published: AUG 2007
Times Cited: 19
DOI: 10.1007/S11069-006-9091-0
added
28-Jul-09
15.Title: Statistical Downscaling of Precipitation in Korea Using Multimodel Output Variables as Predictors
Author(s): Kang, H.; Park, C. K.; Saji, N. H.; et al.
Source: Monthly Weather Review Volume: 137 Pages: 1928-1938 Published: 2009
Times Cited: 19
DOI: 10.1175/2008MWR2706.1
added
24-May-10
16.Title: Intercomparison of the seasonalcycle of the tropical surface wind stress in 17 AMIP atmospheric general circulation models
Author(s): Saji, N. H.; Goswami, B. N.
Source: Climate Dynamics Volume: 13 Pages: 561-585 Published: 1997
Times Cited: 12
DOI: 10.1007/s003820050183
added
24-May-10
17.Title: Hindcast skill and predictability for precipitation and two-meter air temperature anomalies in global circulation models over the Southeast United States
Author(s): Stefanova, Lydia; Misra, Vasubandhu; O’Brien, James; et al.
Source: Climate Dynamics Pages: 1-13 Published: 2011
Times Cited: 8
DOI: 10.1007/s00382-010-0988-7 / Author-provided URL : http://dx.doi.org/10.1007/s00382-010-0988-7
added
01-Nov-11
18.Title: Evaluation of the Weather Generator CLIGEN with Daily Precipitation Characteristics in Korea
Author(s): Min, Y. M.; Kryjov, V.; An, K. H.; et al.
Source: Asia-Pacific Journal of Atmospheric Sciences Volume: 47 Pages: 255-263 Published: 2011
Times Cited: 7
DOI: 10.1007/s13143-011-0014-y
added
01-Nov-11
19.Title: An improved linear model of tropical surface wind variability
Author(s): SAJI, NH; GOSWAMI, BN
Source: QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY Volume: 122 Issue: 529 Pages: 23-53 Published: JAN 1996
Times Cited: 6
DOI: 10.1256/smsqj.52902
added
29-Jul-09
20.Title: SIMULATION OF ENSO-RELATED SURFACE WINDS IN THE TROPICAL PACIFIC BY AN ATMOSPHERIC GENERAL-CIRCULATION MODEL FORCED BY OBSERVED SEA-SURFACE TEMPERATURES
Author(s): GOSWAMI, BN; KRISHNAMURTHY, V; SAJI, NH
Source: MONTHLY WEATHER REVIEW Volume: 123 Issue: 6 Pages: 1677-1694 Published: JUN 1995
Times Cited: 6
DOI: 10.1175/1520-0493(1995)1232.0.CO;2
added
29-Jul-09
21.Title: Nonlinear, Intraseasonal Phases of the East Asian Summer Monsoon: Extraction and Analysis Using Self-Organizing Maps
Author(s): Chu, Jung-Eun; Hameed, Saji N.; Ha, Kyung-Ja
Source: Journal of Climate Volume: 25 Issue: 20 Pages: 6975-6988 Published: 2012/10/01
Times Cited: 6
DOI: 10.1175/JCLI-D-11-00512.1 / Author-provided URL : http://dx.doi.org/10.1175/JCLI-D-11-00512.1
added
04-Apr-13
22.Title: What caused the cool summer over northern Central Asia, East Asia and central North America during 2009?
Author(s): Kyung-Ja Ha and Jung-Eun Chu and June-Yi Lee and Bin Wang and Saji, N. Hameed and Masahiro Watanabe
Source: Environmental Research Letters Volume: 7 Issue: 4 Pages: 044015 Published: 2012
Author-provided URL : http://stacks.iop.org/1748-9326/7/i=4/a=044015
added
30-Oct-12
23.Title: Accelerating Lagrangian Particle Dispersion in the Atmosphere with OpenCL Across Multiple Platforms
Author(s): Harvey, Paul; Hameed, Saji; Vanderbauwhede, Wim
Conference: Proceedings of the International Workshop on OpenCL 2013 & 2014 Pages: 1-8 Year: 2014
Author-provided URL : http://doi.acm.org/10.1145/2664666.2664672
added
08-Mar-15
24.Title: The role of tropical Atlantic SST anomalies in modulating western North Pacific tropical cyclone genesis
Author(s): Huo, Liwei; Guo, P.; Saji, N. Hameed; et al.
Source: Geophysical Research Letters Volume: 42 Published: 2015
DOI: 10.1002/2015GL063184
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