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Gupta, Anil K.
- Observations of Rainfall in Garhwal Himalaya, India during 2008-2013 and its Correlation with TRMM Data
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PDF Views:92
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33 G.M.S. Road, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, 33 G.M.S. Road, Dehradun 248 001, IN
Source
Current Science, Vol 108, No 6 (2015), Pagination: 1146-1151Abstract
Rainfall variations in the Garhwal Himalaya, Uttarakhand were studied for a period of six years from 2008 to 2013. The rainfall data were obtained through a dense network of rain gauges installed by India Meteorological Department (IMD), New Delhi, are spreaded over seven districts of Uttarakhand, combined with the data from Wadia Institute of Himalayan Geology (WIHG) rain gauge located at Ghuttu, Garhwal Himalaya. The rainfall data of WIHG have a sampling interval of 15 min, while IMD provides district- wise rainfall measurements with monthly temporal resolution. Therefore, extreme events of rainfall which occurred in a short duration of time were observed using the rainfall data of WIHG. Similarly, daily diurnal variations of rainfall were also observed in these data. The seasonal variations and distribution of rainfall in different districts of the Garhwal region were seen in both WIHG and IMD datasets. An increasing trend of rainfall activity was seen from 2008 to 2013. Meterological observations suggest that the isohyet has shifted towards end-September in recent years. Two events of extreme rainfall in the Garhwal Himalaya in 2012 and 2013 caused a major loss of life and property in the region. The rain gauge of WIHG recorded heavy rainfall during both the events. In 2012, ~70 mm rainfall was recorded in 1 h and in 2013 the rain gauge data showed about 250 mm rainfall in 52 h. The daily diurnal records of rainfall show a minimum between 0700 and 1300 h local time (local time = UT + 5.30 h) and diurnal maximum between 2200 and 0300 h local time for all the years. The seasonal variation of rainfall reveals that the peak season of monsoon ranges from June to September in the Garhwal region, which contributes about 50-90% to the annual rainfall. We also compared the observed results of rain gauges with TRMM-derived rainfall data and found a good correlation ranging from 0.6 to 0.9.Keywords
Extreme Rainfall Events, Rain Gauge, Monsoon Season, Seasonal And Diurnal Variations.Full Text
- Functional Morphology of Melonis Barleeanum and Hoeglundina elegans: a Proxy for Water-Mass Characteristics
Abstract Views :273 |
PDF Views:85
Authors
Affiliations
1 Department of Applied Geology, Indian School of Mines, Dhanbad 826 004, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 Department of Geological Sciences, Brown University, Providence, Rhode Island 02912-1846, US
4 National Council for Cement and Building Materials, 34 km Stone, Delhi Mathura Road (NH-2), Ballabgarh 121 004, IN
1 Department of Applied Geology, Indian School of Mines, Dhanbad 826 004, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 Department of Geological Sciences, Brown University, Providence, Rhode Island 02912-1846, US
4 National Council for Cement and Building Materials, 34 km Stone, Delhi Mathura Road (NH-2), Ballabgarh 121 004, IN
Source
Current Science, Vol 106, No 8 (2014), Pagination: 1133-1140Abstract
Morphometric study of Melonis barleeanum and Hoeglundina elegans was carried out on 15 core top samples from the Indian Ocean. Length to breadth ratios and wall and septal thicknesses of the largest tests of both the species from each sample, along with δ13C and δ18O values of Cibicides wuellerstorfi were measured. Both the species show equal growth rates of the test in their normal habitat. However, the high organic carbon preference species M. barleeanum shows more elongation of the test during food scarcity. This effect is not evident in H. elegans, which varies in its wall and septal thicknesses with bottom-water oxygen levels of the deep water mass up to 2000 m, probably to maintain the required rate of osmosis for the intake of dissolved O2. Below this depth both parameters show parallel relationship with deviation indicating that oxygenation may play some role in the variation of wall and septal thicknesses. Thinning or thickening of the wall and septa in M. barleeanum and H. elegans has no relation with the water depth, indicating no relation with either the overlying pressure effect or nutrients as each deep water mass has a different nutrient budget. Depletion in δ13C and enrichment in δ18O below 2000 m water depth suggests that up to 2000 m depth, the Indian Ocean is bathed by the welloxygenated, low-nutrient North Atlantic Deep Water (NADW), whereas below 3000 m cold, nutrient-rich Antarctic Bottom Water (AABW) is dominant. Between 2000 and 3000 m water depths, the water mass in the Indian Ocean is a mixture of NADW and AABW.Keywords
Benthic Foraminifera, Hoeglundina elegans, Melonis Barleeanum, Osmosis, Septal Thickness.Full Text
- Geothermal Systems in the Northwest Himalaya
Abstract Views :241 |
PDF Views:100
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehardun 248 001, IN
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehardun 248 001, IN
Source
Current Science, Vol 108, No 9 (2015), Pagination: 1597-1599Abstract
Conventional energy resources are fast depleting and therefore alternative resources are required to sustain the fast progress and development of any nation. This situation is more pertinent to India where fast growing population and developmental activities are posing major challenges to the government as the country has limited resources of energy. Therefore, focused research should be intensified to explore the potential of geothermal energy resources in India. Realizing its importance, Wadia Institute of Himalayan Geology, Dehradun, has started a major research programme to study geothermal systems of the Himalaya covering Uttarakhand, Himachal Pradesh and Leh-Ladakh regions of India.Keywords
Carbon Dioxide Flux, Geothermal Provinces, Heat Pump Functional Unit, Thermal Springs.Full Text
- Novel Coronavirus Epidemic:New Dimension for Disaster Management and Health Resilience
Abstract Views :321 |
PDF Views:74
Authors
Affiliations
1 National Institute of Disaster Management, Ministry of Home Affairs, Government of India, New Delhi 110 001, IN
2 Department of Community Medicine, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi 110 029, IN
1 National Institute of Disaster Management, Ministry of Home Affairs, Government of India, New Delhi 110 001, IN
2 Department of Community Medicine, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi 110 029, IN
Source
Current Science, Vol 118, No 8 (2020), Pagination: 1149-1150Abstract
The novel coronavirus (COVID-19) is a new strain of pre-existing coronaviruses that caused the recent pandemic. Corona-viruses are also known to cause diseases like Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS) in humans. The 2019 coronavirus outbreak that originated from Wuhan, China has killed 1018 people globally and infected more than 40,000 people as on 11 February 2020 (ref.1). It has been declared as a Public Health Emergency of International Concern (PHEIC) by World Health Organization (WHO). COVID-19 is a zoonotic virus, that is, it is transmitted from animals to humans and causes disease. Although the animal source of COVID-19 has not yet been confirmed, it is likely to have originated from a wet market in China. The common signs of infection range from mild respiratory symptoms to severe pneumonia or even death. The disease can be transmitted from person to person via respiratory droplets from an infected person while sneezing, coughing or talking. The current estimates of the incubation period for the disease range from 2 to 14 days2 .Full Text
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- Regional disparity in summer monsoon precipitation in the Indian subcontinent during Northgrippian to Meghalayan transition
Abstract Views :184 |
PDF Views:78
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 School of Earth, Ocean and Climate Sciences, Indian Institute of Technology Bhubaneswar, Argul 752 050, IN
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 School of Earth, Ocean and Climate Sciences, Indian Institute of Technology Bhubaneswar, Argul 752 050, IN
Source
Current Science, Vol 120, No 9 (2021), Pagination: 1449-1457Abstract
The present study reveals distinct spatial variability of summer monsoon precipitation in Indian subcontinent during Northgrippian to Meghalayan transition. Protracted dry phase lasting ~1000 yrs was observed ~4.2 ka BP in southern and northwestern India whereas 200–300 yrs event occurred in northeastern parts. Strong El Niño conditions beginning ~4.3 kyr BP were associated with the millennial long dryness in western parts but its influence was limited in the eastern region. Cross-verified, high-resolution records from different geographic regions of India are still required to ascertain if regional differences occurred in span and magnitude during Northgrippian to Meghalayan transition.Keywords
Indian summer monsoon, Indus civilization, Late Holocene, 4.2 ka event, Meghalayan ageFull Text
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