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S. Sharmila
Federation University Australia
14Publications
10H-index
336Citations
Publications 16
Newest
#1Kevin J. E. Walsh (University of Melbourne)H-Index: 32
#2Walsh K.J.E. (University of Melbourne)
Last.A. Vaughan (UNSW: University of New South Wales)
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AbstractThis study aims to investigate the response of simulated tropical cyclone formation to specific climate conditions, using an idealized aquaplanet framework of a ∼40- km horizontal resolutio...
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#1S. Sharmila (FedUni: Federation University Australia)H-Index: 10
#2Kevin J. E. Walsh (University of Melbourne)H-Index: 32
Recent research indicates that the annual-mean locations of tropical cyclones have migrated toward higher latitudes. Concurrently, an anthropogenically forced tropical expansion has been observed, yet the connection between the two processes remains little-explored. Here, using observational and reanalysis data, we investigate how large-scale dynamical effects, combined with coherent changes in the regional Hadley circulation, explain recent changes in regional tropical cyclone genesis over 1980...
7 CitationsSource
#1S. Sharmila (University of Melbourne)H-Index: 10
#2Kevin J. E. Walsh (University of Melbourne)H-Index: 32
AbstractSignificant advances have been made in understanding the key climate factors responsible for tropical cyclone (TC) activity, yet any theory that estimates likelihood of observed TC formation rates from mean climate states remains elusive. The present study investigates how the extremes of observed TC genesis (TCG) frequency during peak TC seasons are interrelated with distinct changes in the large-scale climate conditions over different ocean basins using the global International Best Tr...
4 CitationsSource
#1A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
#2S. Sharmila (University of Melbourne)H-Index: 10
Last.A. K. Srivastava (India Meteorological Department)H-Index: 1
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The duration and extreme fluctuations of prolonged wet or dry spells associated with intraseasonal variability during extreme monsoon have devastating impacts on agrarian-based economy over Indian subcontinent. This study examines the potential predictability limit of intraseasonal transitions between rainy to non-rainy phases (i.e., active to break phases) or vice versa over central Indian region during extreme monsoon using very high-resolution (0.25° × 0.25°) daily rainfall datasets. The pres...
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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.R. Phani (IITM: Indian Institute of Tropical Meteorology)H-Index: 2
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The onset/progression phase of theIndian summer monsoon (ISM) is very crucial for the agricultural sector of the country as it has strong bearing on the sowing of kharif crops, which in turn affects overall food grain production and hence food security. The recent ISMs of 2013 and 2014 exhibited quite distinct progression phases. While 2013 had one of the fastest advancement in the last 70 years, 2014 witnessed a comparatively lethargic progression phase. The major difference was felt in the ear...
5 CitationsSource
#1N. Borah (IITM: Indian Institute of Tropical Meteorology)H-Index: 9
#2A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
Last.A. Kumar (Silver Spring Networks)H-Index: 1
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Several aspects of real-time forecast of Indian summer monsoon (ISM) in 3–4 pentad lead time (extended range) are discussed in this study to explore the operational capability of the Climate Forecast System model version 2 (CFSv2) developed by National Centre for Environmental Prediction (NCEP). 2013 summer monsoon was a near excess monsoon year in terms of seasonal mean and was a result of rich diversity of phenomena including strong intraseasonal variations and intense northward propagations o...
12 CitationsSource
#1S. Abhilash (UM: University of Miami)H-Index: 1
#2A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
Last.A. A. KumarH-Index: 9
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AbstractThis study describes an attempt to overcome the underdispersive nature of single-model ensembles (SMEs). As an Indo–U.S. collaboration designed to improve the prediction capabilities of models over the Indian monsoon region, the Climate Forecast System (CFS) model framework, developed at the National Centers for Environmental Prediction (NCEP-CFSv2), is selected. This article describes a multimodel ensemble prediction system, using a suite of different variants of the CFSv2 model to incr...
13 CitationsSource
#1S. Sharmila (IITM: Indian Institute of Tropical Meteorology)H-Index: 10
#2S. Joseph (IITM: Indian Institute of Tropical Meteorology)H-Index: 13
Last.Bhupendra Nath Goswami (IITM: Indian Institute of Tropical Meteorology)H-Index: 46
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A diagnostic study of the space-time characteristics of the summer monsoon intraseasonal oscillations (MISO) during strong monsoon (SM) and weak monsoon (WM) years is carried out to gain insight on the role of the seasonal mean states on the MISOs using long observational and reanalysis datasets. Prominent asymmetry is noted in the duration and magnitude of active-break spells associated with MISO during SM and WM years. Such difference is also reflected in the northward propagation of MISOs ove...
10 CitationsSource
#1A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
#2S. Abhilash (IITM: Indian Institute of Tropical Meteorology)H-Index: 11
Last.M. Rajeevan (Government of India)H-Index: 33
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Optimization of computational efficiency is indispensable in the incorporation of numerical complexity in a pragmatic climate forecast system. From the resource optimization standpoint, the debate regarding, to what extent increased computing efficiency and expense on resources has reduced the signal-to-noise ratio and improved our understanding towards future climate states on different time scales, still continues. With the recent advancement of real time climate forecasts from different opera...
18 CitationsSource
#1S. Joseph (IITM: Indian Institute of Tropical Meteorology)H-Index: 13
#2A. K. Sahai (IITM: Indian Institute of Tropical Meteorology)H-Index: 19
Last.Arun KumarH-Index: 57
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The Indian summer monsoon of 2013 covered the entire country by 16 June, one month earlier than its normal date. Around that period, heavy rainfall was experienced in the north Indian state of Uttarakhand, which is situated on the southern slope of Himalayan Ranges. The heavy rainfall and associated landslides caused serious damages and claimed many lives. This study investigates the scientific rationale behind the incidence of the extreme rainfall event in the backdrop of large scale monsoon en...
45 CitationsSource
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