A5018632050- Climate variability and models
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Atmospheric aerosols and clouds
- Ocean Waves and Remote Sensing
- Precipitation Measurement and Analysis
- Fluid Dynamics and Turbulent Flows
- Combustion and flame dynamics
- Fish Biology and Ecology Studies
- Aerodynamics and Acoustics in Jet Flows
- Wind and Air Flow Studies
- Identification and Quantification in Food
- Heavy metals in environment
- Marine and fisheries research
- Fisheries and Aquaculture Studies
- Environmental Toxicology and Ecotoxicology
- Plant Water Relations and Carbon Dynamics
- Geophysics and Gravity Measurements
- Heat Transfer Mechanisms
- Atmospheric chemistry and aerosols
- Marine and coastal ecosystems
- Particle Dynamics in Fluid Flows
- Water Quality and Pollution Assessment
- Aeolian processes and effects
Indian Institute of Science Bangalore
2016-2025
Oceanography Society
2016
Central Marine Fisheries Research Institute
2006-2007
Andhra University
2001
Florida State University
2000
The first observational experiment under the Indian Climate Research Programme, called Bay of Bengal Monsoon Experiment (BOBMEX), was carried out during July–August 1999. BOBMEX aimed at measurements important variables atmosphere, ocean, and their interface to gain deeper insight into some processes that govern variability organized convection over bay. Simultaneous time series observations were in northern southern from ships moored buoys. About 80 scientists 15 different institutions...
The objectives of the Winter Fog Experiment (WIFEX) over Indo-Gangetic Plains India are to develop better now-casting and forecasting winter fog on various time-and spatial scales.Maximum occurrence northwest is about 48 days (visibility <1000 m) per year, it occurs mostly during December-February time-period.The physical chemical characteristics fog, meteorological factors responsible for its genesis, sustenance, intensity dissipation poorly understood.Improved understanding above aspects...
Abstract A major drought occurred over India in the year 2002 with a seasonal rainfall deficit of 21.5%, result 56% below normal month July. The largest anomalies western parts India, when an Indian monsoon field experiment was progress there. present study is based primarily on data collected from research ship that deployed 100–250 km off west coast for experiment. Surface and upper air observations made eastern Arabian Sea during July are presented. Sea‐surface conditions were favourable...
Abstract Air–Sea Interactions in the Northern Indian Ocean (ASIRI) is an international research effort (2013–17) aimed at understanding and quantifying coupled atmosphere–ocean dynamics of Bay Bengal (BoB) with relevance to monsoons. Working collaboratively, more than 20 institutions are acquiring field observations operational high-resolution models address scientific issues that have stymied monsoon predictability. ASIRI combines new mature observational technologies resolve submesoscale...
Abstract The Bay of Bengal (BoB) plays a fundamental role in controlling the weather systems that make up South Asian summer monsoon system. In particular, southern BoB has cooler sea surface temperatures (SST) influence ocean–atmosphere interaction and impact monsoon. Compared to southeastern BoB, southwestern is cooler, more saline, receives much less rain, influenced by current (SMC). To examine these features on monsoon, Boundary Layer Experiment (BoBBLE) was jointly undertaken India...
Abstract The vertical structure of radar reflectivity factor in active convective clouds that form during the South Asian monsoon season is reported using 2A25 version 6 data product derived from precipitation measurements on board Tropical Rainfall Measuring Mission satellite. We define two types cells, namely, cumulonimbus towers (CbTs) and intense cells (ICCs). CbT defined referring to a threshold 20 dBZ at 12 km altitude least 9 thick. ICCs are constructed thresholds 8 3 altitudes. Cloud...
Abstract Significant increase in the frequency of occurrences rainfall extremes has been reported over several parts world. These extreme events were defined at individual grids without considering their spatial extent. Here, using ground-based observations India during boreal summer, we show that average size spatially collocated significantly increasing since 1980. However, such remains unchanged. Around 90% total number large-sized (area ≥ 70 × 10 3 km 2 ) our study period (1951 to 2015)...
Abstract The INCOMPASS field campaign combines airborne and ground measurements of the 2016 Indian monsoon, towards ultimate goal better predicting monsoon rainfall. supplies majority water in South Asia, but forecasting from days to season ahead is limited by large, rapidly developing errors model parametrizations. lack detailed observations prevents thorough understanding circulation its interaction with land surface: a process governed boundary‐layer convective‐cloud dynamics. used UK...
Weather radar is an indispensable tool in the continuous monitoring and warning of extreme events including tropical cyclones thunderstorms. The India Meteorological Department (IMD) has been operating radars since 1949. evolution meteorology may be divided into three broad phases, namely, 1950s (phase-I), then up to year 2000 (phase-II), thereafter (phase-III). During phase-I, were imported installed cities aid aircraft operations. Photographs scopes analysed provide a understanding...
We report here an experimental study of a round vertical liquid jet that, after achieving self-preserving state, is subjected to volumetric heating between two diametral stations. The heat injection achieved by applying voltage across the stations, fluid having been rendered electrically conducting addition acid. Using laser-induced fluorescence, digital image processing and laser-Doppler anemometry, flow properties have studied in detail. It found with sufficient heating, no longer grows...
Abstract In recent years India has been increasingly experiencing widespread floods induced by large‐scale extreme rainfall events (LEREs). LEREs are mainly associated with monsoon low‐pressure systems (LPS). The forecast of these high‐flood‐potential events, however, remained challenging. Here, we compare LPSs the summer that led to (LPS‐Lg) and strong did not result in (LPS‐noLg) over central for period 1979–2012. We show having a LPS is sufficient condition produce LEREs, LPS‐Lgs...
Abstract The demand for effective methods to augment precipitation over arid regions of India has been increasing the past several decades as changing climate brings warmer average temperatures. In fourth phase Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX IV), a scientific investigation was conducted rain-shadow region Western Ghats mountains in India. primary objective investigate efficacy hygroscopic seeding convective clouds develop cloud protocol. CAIPEEX...
Abstract This study is based on the analysis of 10 years data for radar reflectivity factor Z e as derived from TRMM Precipitation Radar (PR) measurements. The vertical structure active convective clouds at PR pixel scale has been extracted by defining two types cells. first one cumulonimbus tower (CbT), which contains ≥ 20 dB 12-km altitude and least 9 km deep. other intense cloud (ICC), belongs to top 5% population distribution a prescribed reference height. Here heights (3 8 km) have...
Some of the highest summer monsoon rainfall in South Asia falls on windward slopes Western Ghats mountains India's west coast and offshore over eastern Arabian Sea. Understanding processes determining spatial distribution temporal variability this region remains incomplete. In paper, new Interaction Convective Organization Monsoon Precipitation, Atmosphere, Surface Sea (INCOMPASS) aircraft ground‐based measurements upstream them are presented placed within context remote‐sensing observations...
Abstract In the Bay of Bengal, warm, dry boreal spring concludes with onset summer monsoon and accompanying southwesterly winds, heavy rains, variable air–sea fluxes. Here, we summarize 2018 using observations collected through multinational Monsoon Intraseasonal Oscillations in Bengal (MISO-BoB) program between United States, India, Sri Lanka. MISO-BoB aims to improve understanding intraseasonal variability, field effort captured coupled response during a transition from active-to-break...
Observations from moored buoys during spring of 1998–2000 suggest that the warming mixed layer (∼20 m deep) north Indian Ocean warm pool is a response to net surface heat flux Q (∼100 W −2 ) minus penetrative solar radiation pen (∼45 ). A residual cooling due vertical mixing and advection indirectly estimated be about 25 . The rate typical values not very sensitive depth if it lies between 10 30 m.
The Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) with the capability of measuring sea surface temperature (SST) in presence clouds, has been providing an unprecedented view tropical basin-scale SST variability. In this paper, assessment accuracy derived from TMI over Bay Bengal using situ data collected moored buoys and research ships, is presented. authors find that captures evolution bay on seasonal time scales reasonable accuracy. mean difference between less than...
Abstract Mangalore coast is well known for its multi‐species and multi‐gear fisheries the fishery oceanographic features of this region a true representation Malabar upwelling system. Ten years study (1995–2004) parameters has been carried out from inshore waters off to understand their seasonal interannual variations influences on pelagic region. Attempt also made influence local global environmental conditions alternating patterns abundance between Indian mackerel oil sardine area. Field‐...
Abstract Under the INCOMPASS project, state of art eddy‐covariance based surface flux measurement systems were installed at eight locations across India. These sites cover different climatic conditions, land use and cover, water management practices. Here we present initial analysis measurements taken seven mainly focusing on year 2017, quantifying for first time remarkable contrasts in evaporative fraction seasons, climate zones practices Indian subcontinent. With exception Jaisalmer which...
The convective available potential energy (CAPE) based on monthly mean sounding has been shown to be relevant deep convection in the tropics. variation of CAPE with SST found similar frequency at one station each tropical Atlantic and W. Pacific oceans. This suggests a strong link between CAPE. It that so derived can interpreted as work atmosphere above boundary layer ascent region subsidence surrounding cloud-free region.
Clouds are the largest source of uncertainty in climate science, and remain a weak link modeling tropical circulation. A major challenge is to establish connections between particulate microphysics macroscale turbulent dynamics cumulus clouds. Here we address issue from latter standpoint. First show how create bench-scale flows that reproduce variety cumulus-cloud forms (including two genera three species), track complete cloud life cycles--e.g., "cauliflower" congestus dissipating fractus....
The convective area within a mesoscale system (MCS) contains intense cells or storms which themselves could be made of single cumulonimbus cloud several them joined together. Interconnection between MCS evolution and has not been reported previously. We address this gap by using the Doppler Weather Radar (DWR) data collected at four stations in India during summer monsoon season 2013. DWR locations selected have different climates ranging from coastal to semi‐arid. Storm is defined as set...