Saji HameedThe University of Aizu · Division of Computer Sciences
Saji Hameed
PhD (Atmospheric Sciences)
About
43
Publications
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Introduction
I am working to understand the role of coupled ocean-atmosphere interaction in the tropical Indian and Pacific Oceans
Additional affiliations
January 2010 - present
August 2006 - December 2009
February 2002 - July 2006
Publications
Publications (43)
Impacts of Indian Ocean Dipole mode (IOD) events on global climate are estimated by correlation/regression analysis. The analysis examined land rain and temperature and 3-dimensional atmospheric variables for a 42 yr period from January 1958 to December 1999. The correlation between IOD and the El Niño Southern Oscillation (ENSO) is accounted for u...
1] Intense intraseasonal cooling events in the tropical south Indian Ocean are examined using eight years of TRMM observations. These events occur almost every year during austral summer when the intertropical convergence zone is displaced south of the equator and roughly collocated with a thermocline ridge. Composite maps of SST, OLR and surface w...
For the tropical Pacific and Atlantic oceans, internal modes of variability that lead to climatic oscillations have been recognized, but in the Indian Ocean region a similar ocean-atmosphere interaction causing interannual climate variability has not yet been found. Here we report an analysis of observational data over the past 40 years, showing a...
A review of the Indian Ocean Dipole. It is available online at
http://climatescience.oxfordre.com/view/10.1093/acrefore/9780190228620.001.0001/acrefore-9780190228620-e-619
or
DOI: 10.1093/acrefore/9780190228620.013.619
Following advise from Immanuel Kant, I started using my own coginitive and judgement machinery.
1. First, I looked around me and saw if people were gasping for breath and passing out, as I had seen on social media platforms.
2. I travelled to certain risky areas, sampled the fresh air into my lungs continuously, exchanged hand shakes and hugs....
Following advise from Immanuel Kant, I started using my own coginitive and judgement machinery.
1. First, I looked around me and saw if people were gasping for breath and passing out, as I had seen on social media platforms.
2. I travelled to certain risky areas, sampled the fresh air into my lungs continuously, exchanged hand shakes and hugs....
The usefulness of dynamical downscaling of seasonal reforecasts of Indian Monsoon is explored to address the seasonal mean biases in the reforecasts. Almost all the current generation global coupled models, including the Climate Forecast System version 2 (CFSv2, T126 ~110 km), exhibit systematic mean dry bias over the central Indian region during t...
A dry bias in climatological Central Indian rainfall plagues Indian summer monsoon (ISM) simulations in multiple generations of climate models. Here, using observations and regional climate modeling, we focus on a warm coastal Bay of Bengal sea surface temperature (SST) front and its impact on Central Indian rainfall. The SST front, featuring sharp...
(The article can be accessed from https://www.nature.com/articles/s41467-018-04803-7; Open Access)
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Super El Niños, the strongest and most powerful of El Niños, impact economies, societies, and ecosystems disproportionately. D...
The eastern China Precipitation Dipole (ECPD) features an out-of-phase relationship between boreal summer precipitation over the middle and lower reaches of the Yangtze River and the Hetao Region to its northwest. The precipitation dipole is strongly influenced by ENSO teleconnections over the western tropical Pacific. Here it is shown that a prono...
High Performance Computing (HPC) platforms allow scientists to model
computationally intensive algorithms. HPC clusters increasingly use
General-Purpose Graphics Processing Units (GPGPUs) as accelerators; FPGAs
provide an attractive alternative to GPGPUs for use as co-processors, but they
are still far from being mainstream due to a number of chall...
The connection between north tropical Atlantic (NTA) sea surface temperature (SST) anomalies and tropical cyclone (TC) genesis over the western North Pacific (WNP) and associated physical mechanisms are investigated in this study. We demonstrate a remarkable negative correlation of WNP TC genesis frequency with the (preceding) boreal spring NTA SST...
FLEXPART is a popular simulator that models the transport and diffusion of air pollutants, based on the Lagrangian approach. It is capable of regional and global simulation and supports both forward and backward runs. A complex model like this contains many calculations suitable for parallelisation. Recently, a GPU-accelerated version of the simula...
FLEXPART is a popular simulator that models the transport and diffusion of air pollutants, based on the Lagrangian approach. It is capable of regional and global simulation and supports both forward and backward runs. A complex model like this contains many calculations suitable for parallelisation. Recently, a GPU-accelerated version of the simula...
Cool and wet weather conditions hit northern Central Asia, East Asia and central North America during the 2009 summer in concert with a strong jet stream and a prominent meandering upper-level circulation in the Northern Hemisphere mid-latitudes despite the fact that the year 2009 is the fifth warmest year globally in the modern record. It is found...
The hypothesis that regional characteristics of the East Asian summer monsoon (EASM) result from the
presence of nonlinear coupled features that modulate the seasonal circulation and rainfall at the intraseasonal
time scale is advanced in this study. To examine this hypothesis, the authors undertake the analysis of daily
EASM variability using a no...
We advance the hypothesis that regional characteristics of the East
Asian Summer Monsoon (EASM) result from the presence of non-linear
coupled features that modulate the seasonal circulation and rainfall at
the intraseasonal timescale. To examine this hypothesis, we undertake
the analysis of daily EASM variability using a non-linear multivariate
da...
The ability of the CLImate GENerator (CLIGEN) weather generator to reproduce daily precipitation characteristics for Korea
was assessed on the basis of 55-year long historical daily precipitation records from eight weather stations (Seoul, Incheon,
Daegu, Ulsan, Gwangju, Busan, Kangneung, and Jeonju) representing different parts of the Korean penin...
This paper presents an assessment of the seasonal prediction skill of current global circulation models, with a focus on the
two-meter air temperature and precipitation over the Southeast United States. The model seasonal hindcasts are analyzed using
measures of potential predictability, anomaly correlation, Brier skill score, and Gerrity skill sco...
A pattern projection downscaling method is applied to predict summer precipitation at 60 stations over Korea. 'Me predictors are multiple variables from the output of six operational dynamical models. The hindcast datasets span a period of 21 yr from 1983 to 2003. A downscaled prediction was made for each model separately within a leave-one-out cro...
The sea surface temperature anomalies (SSTA) of tropical Pacific in the
boreal summer of 2004 show a distinct tripolar pattern with warm SSTA in
the central tropical Pacific, flanked on both sides by cold SSTA. The
distinct conditions during the boreal summer of 2004 and the following
winter were catalogued as a new coupled phenomenon named El Niño...
Intense cooling of the sea surface at intraseasonal time scales takes place in the southern tropical Indian Ocean during austral summer. Mechanisms that cause intraseasonal cooling are investigated using in situ observations by Argo floats, remote sensing data sets and simulation using a high resolution ocean general circulation model of the Indian...
The relative impacts of the ENSO and Indian Ocean dipole (IOD) events on Indian summer (June–September) monsoon rainfall at
sub-regional scales have been examined in this study. GISST datasets from 1958 to 1998, along with Willmott and Matsuura gridded
rainfall data, all India summer monsoon rainfall data, and homogeneous and sub-regional Indian ra...
For coupled modelling studies, the atmospheric component is required to simulate the large-scale part of the observed surface winds accurately, as only this part is responsible for driving low-frequency interannual variability in the oceans. A simple linear model of the tropical atmosphere is developed in which surface winds are viewed as the respo...
The twentieth-century simulations using by 17 coupled ocean–atmosphere general circulation models (CGCMs) submitted to the Intergovernmental Panel on Climate Change’s Fourth Assessment Report (IPCC AR4) are evaluated for their skill in reproducing the observed modes of Indian Ocean (IO) climate variability. Most models successfully capture the IO’s...
The Asian summer monsoon is organized into distinct convection centers, but the mechanism for this organization is not well understood. Analysis of new satellite observations reveals that narrow mountain ranges are an important organizing agent anchoring monsoon convection centers on the windward side. The Bay of Bengal convection, in particular, f...
The impact of Indian Ocean Dipole (IOD) mode events on austral surface air temperature (SAT) variability was studied both by statistical analysis of observed/assimilated data and experiments with a mechanistic baroclinic atmospheric model.During the period of analysis (January 1958–December 1999), IOD events had the strongest impact on SAT anomalie...
The relative influences of the ENSO and Indian Ocean Dipole (IOD) events on the Indian summer rainfall were studied using observational data and an atmospheric general circulation model (AGCM). The composite analysis of rainfall anomalies demonstrates that the IOD, while significantly influencing the Indian summer monsoon rainfall, also significant...
![FIG. 4. Sep-Nov IOD composite [(positive events-negative events)/2] of...](profile/Swadhin-Behera/publication/232643291/figure/fig2/AS:669024027439122@1536519166829/Sep-Nov-IOD-composite-positive-events-negative-events-2-of-zonal-mass-flux-Bergman_Q320.jpg)
A study of the detailed spatiotemporal characteristics of the Indian Ocean dipole (IOD) mode in SST and surface winds using available observations from 1958 till 1997 is reported. The analysis is used to address several of the controversial issues regarding the IOD.One key finding of this study is that interdecadal fluctuations contribute strongly...
The misleading aspect of the statistical analyses used in Dommenget and Latif, which raises concerns on some of the reported climate modes, is demonstrated. Adopting simple statistical techniques, the physical existence of the Indian Ocean dipole mode is shown and then the limitations of varimax and regression analyses in capturing the climate mode...
![FIG. 4. Sep-Nov IOD composite [(positive events-negative events)/2] of...](profile/Saji-Hameed/publication/236030594/figure/fig2/AS:670328976068617@1536830290377/Sep-Nov-IOD-composite-positive-events-negative-events-2-of-zonal-mass-flux-Bergman_Q320.jpg)
Unusual westward wind anomalies were observed in the Indian Ocean during 1994. The response of the ocean to these anomalies is studied using an ocean general circulation model forced with interannual winds. Model results show that the eastward equatorial jets in the Indian Ocean were weak during 1994. Consequently, the sea level in the eastern Indi...
The mean state of the tropical atmosphere is important as the nature of the coupling between the ocean and the atmosphere
depends nonlinearly on the basic state of the coupled system. The simulation of the annual cycle of the tropical surface wind
stress by 17 atmospheric general circulation models (AGCMs) is examined and intercompared. The models...
The authors present the simulation of the tropical Pacific surface wind variability by a low-resolution (R15 horizontal resolution and 18 vertical levels) version of the Center for Ocean-Land-Atmosphere Interactions, Maryland, general circulation model (GCM) when forced by observed global sea surface temperature. The authors have examined the month...
Questions
Question (1)
Projects
Projects (7)
To provide an alternative, personal view of current and events to come (now that we have the Noble metal poured into climate change, it is hard not to see what might happen)
Provide near real-time updates of ocean-atmosphere conditions over the tropical Indian Ocean. We seem to have the first strong IOD since 2006
Pls. visit http://enformtk.u-aizu.ac.jp
ICAR is an exciting new climate center being set up at the Nanjing University of Information Science and Technology in Nanjing, China. In this space, I will post information related to ICAR, especially upcoming positions and projects
