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A. K. Sahai
Indian Institute of Tropical Meteorology
70Publications
19H-index
1,483Citations
Publications 76
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#1R. Mandal (Savitribai Phule Pune University)H-Index: 5
#2S. Joseph (IITM: Indian Institute of Tropical Meteorology)H-Index: 13
Last.D. R. Pattanaik (India Meteorological Department)H-Index: 6
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Heat waves over India occur during the months of March-June. This study aims at the real-time monitoring and prediction of heat waves using a multi-model dynamical ensemble prediction system developed at Indian Institute of Tropical Meteorology, India. For this, a criterion has been proposed based on the observed daily gridded maximum temperature (Tmax) datasets, which can be used for real-time prediction as well. A heat wave day is identified when either (1) Tmax (a)≥ its climatological 95th pe...
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#1Suryachandra A. Rao (IITM: Indian Institute of Tropical Meteorology)H-Index: 25
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AbstractIn spite of the Summer Monsoon’s importance in determining the life and economy of agriculture-dependent country like India, committed efforts towards improving its prediction and simulatio...
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#1A. Dey (Savitribai Phule Pune University)H-Index: 2
#2R. Chattopadhyay (IITM: Indian Institute of Tropical Meteorology)H-Index: 16
Last.S. Abhilash (CUSAT: Cochin University of Science and Technology)H-Index: 11
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Several methods are available to track the intraseasonal oscillation, namely the Madden–Julian oscillation (MJO) and monsoon intraseasonal oscillation (MISO). However, no methods to track both the modes in a uniform framework for real-time application exist. A new method to track the smooth propagation of the MJO and MISO is proposed to use it for real-time monitoring. The new approach is based on extended empirical orthogonal function (EEOF) analysis of the combined field of meridionally averag...
1 CitationsSource
#1S. De (IITM: Indian Institute of Tropical Meteorology)H-Index: 7
#2A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
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#1R. Chattopadhyay (IITM: Indian Institute of Tropical Meteorology)H-Index: 16
#2Anjali Thomas (CUSAT: Cochin University of Science and Technology)
Last.A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
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In the current perception of an increase in extreme precipitation events in a developing and densely populated country like India and the demands of high resolution forecast runs are high, the present study compares the statistical skill of free runs from an operational climate model run in two horizontal resolutions in simulating the frequency and intensity of extreme rainfall events over Indian region. The operational climate model is a version of the National Center for Environmental Predicti...
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#1S. Joseph (IITM: Indian Institute of Tropical Meteorology)H-Index: 13
#2A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
Last.S. Abhilash (CUSAT: Cochin University of Science and Technology)H-Index: 11
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AbstractUnder the National Monsoon Mission Project initiated by the government of India’s Ministry of Earth Sciences, an indigenous dynamical ensemble prediction system (EPS) has been developed at the Indian Institute of Tropical Meteorology based on the state-of-the-art Climate Forecast System Model version 2 (CFSv2) coupled model, for extended-range (~15–20 days in advance) prediction. The forecasts are generated for the entire year covering the southwest monsoon, the northeast monsoon, and th...
1 CitationsSource
#1Soumik Ghosh (BHU: Banaras Hindu University)H-Index: 3
#2R. Bhatla (BHU: Banaras Hindu University)H-Index: 10
Last.A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
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Climate model faces considerable difficulties in simulating the rainfall characteristics of southwest summer monsoon. In this study, the dynamical downscaling of European Centre for Medium-Range Weather Forecast’s (ECMWF’s) ERA-Interim (EIN15) has been utilized for the simulation of Indian summer monsoon (ISM) through the Regional Climate Model version 4.3 (RegCM-4.3) over the South Asia Co-Ordinated Regional Climate Downscaling EXperiment (CORDEX) domain. The complexities of model simulation ov...
6 CitationsSource
#1S. Saranya Ganesh (Savitribai Phule Pune University)H-Index: 1
#2S. Abhilash (CUSAT: Cochin University of Science and Technology)H-Index: 11
Last.R. Phani (IITM: Indian Institute of Tropical Meteorology)H-Index: 2
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An attempt has been made in this study to evaluate the performance of a multi-model ensemble prediction system (MMEPS) in the extended range prediction of genesis and track of cyclonic storms (CS) over North Indian Ocean (NIO) during the onset phase of Indian summer monsoon. The MMEPS comprises of National Centres for Environmental Prediction Climate Forecast System version 2 and its atmospheric component, Global Forecast System version 2, at two different resolutions. In this study, we analyse ...
1 CitationsSource
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