Basic Information

Affiliation
Environmental Informatics Laboratory
Title
Professor
E-Mail
saji@u-aizu.ac.jp
Web site
http://enformtk.u-aizu.ac.jp/

Education

Courses - Undergraduate
Numerical Analysis, Dynamics
Courses - Graduate
High Performance Computing, Numerical Ocean-Atmosphere Modeling using OpenCL, Computational Fluid Dynamics

Research

Specialization
Climate Dynamics
Educational Background, Biography
PhD (Atmospheric Sciences), Indian Institute of Science, Bangalore, India
Current Research Theme
GPS meteorology, Climate dynamics
Key Topic
Numerical Modeling, Super El Nino, Indian Ocean Dipole, Sensor network, Machine Learning
Affiliated Academic Society
American Geophysical Union, Japan Geophysical Union

Others

Hobbies
School days' Dream
Current Dream
Motto
Favorite Books
Messages for Students
Publications other than one's areas of specialization

Main research

Analysing Climate data using Machine Learning Algorithms

Analyze climate data using self organizing maps

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Tracking Clouds and Rain with low cost GPS chips

GPS or Global Positioning System is a popular technology used for positioning and navigation. However GPS signals can also be used for scientific applications. One application is to track clouds and rain. This is possible because GPS signals are delayed by the effect of water vapor in the atmosphere. In our lab we are exploring the use of low cost GPS chips for tracking clouds and rain. The research project will involve collaboration with Fukushima Renewable Energy Center of AIST (http://www.aist.go.jp/fukushima/). We have installed several GPS receivers at FREA including high end and low end versions. The research will involve intercomparison of data from the receivers. It also will develop machine learning algorithms to map water vapour to clouds.

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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.

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Super El Nino

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

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Dissertation and Published Works

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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