Browsing Scholarly literature by Subject "palaeoclimate"
Now showing items 21-40 of 43
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Monsoons, history of
(Academic Press, San Diego, USA, 2001)The evolution of the Asian monsoon started at around 9.5 Ma, in response to the uplift of the Himalayas. The monsoonal intensity reached its maximum at around 5 Ma, and from that time the associated easterly trade winds ... -
New evidence on the sequence of deglacial warming in the tropical Indian Ocean
(John Wiley, 2010)The transition from the Last Glacial Maximum to the Holocene was an internal of climate variability that was characterised by large spatial and temporal variations. Here we show that deglaciation warming in the northern ... -
Paired measurements of foraminiferal delta 18 O and Mg/Ca ratios of Indian monsoons reconstructed from Holocene to Last Glacial record
(Geological Society of China, 2011)The effect of seasonally reversing monsoons in the northern Indian Ocean is to impart significant changes in surface salinity (SS). Here, we report SS changes during the last 32 kyr in the Lakshadweep Sea (southeastern ... -
Palaeoclimatic significance of gypsum pseudomorphs in the inner shelf sediments off Machalipatnam bay
(Geological Society of India, 1988)Pseudo-gypsum crystals have been found in the coarse fraction of the sediments from the inner continental shelf off Machilipatnam Bay. They range in size from 3 to 7 mm are elongate and lenticular in shape. Bassanite and ... -
Paleoclimatic and diagenetic history of the Late Quaternary sediments in a core from the southeastern Arabian Sea: Geochemical and magnetic signals
(The Oceanographic Society of Japan, 2010)Geochemical and rock-magnetic investigations were carried out on a sediment core collected from the SE Arabian Sea at 1420 m depth in oxygenated waters below the present-day oxygen minimum zone. The top 250 cm of the core ... -
Quantitative radiolarian assemblages in surface sediments from the central Indian Basin and their paleomonsoonal significance
(Geological Society of India, 1996)The percentage data of 47 radiolarian coarser taxonomic groups in the surface sediments from the central Indian Basin was subjected to cluster and factor analyses. The R-mode cluster analysis resulted in 3 dominant clusters ... -
Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes
(Elsevier, 1999)The CaCO sub(3) content in Quaternary deep-sea sediments from Pacific and Atlantic oceans have been suggested to respond differently to glacial/interglacial cycles; CaCO sub(3), contents are highest during glacials in ... -
Rapid climatic shifts and its influence on ancient civilisations: Evidence from marine records
(Universities Press, Hyderabad, India, 1998)The southwest (SW) monsoon system in the Arabian Sea exerts a strong influence upon the climatic conditions in South and Southeast Asia and the associated monsoon rainfall has a great impact on the socio-economic and ... -
Recent foraminifera along west coast of India: Restrospect, perspect and prospect
(Indian Academy of Geoscience, 1995)An immense quantum of work on foraminifera is being carried out in Indian waters by various research centers and universities. However, a thorough review of the foraminiferal studies from Indian waters is yet to be amde. ... -
Recently studied sedimentary records from the eastern Arabian Sea: Implications to Holocene monsoonal variability
(The Society of Earth Scientists, 2008)Deep insight into exact mechanism(s) controlling past monsoonal variability on inter-annual to millennial time scales is a pre-requisite for developing predictive capability of monsoon on timescales relevant to human life. ... -
Reconstruction of late Quaternary monsoon oscillations based on clay mineral proxies using sediment cores from the western margin of India
(Elsevier, 2002)In order to reconstruct the variations in the intensity of summer monsoon precipitation during the late Quaternary, two sediment cores from the southwestern continental margin of India were studied for their clay mineral ... -
Reproductive behaviour of benthic foraminifera: A key to palaeoclimate
(Indian Academy of Sciences, Bangalore, 1988)Many benthic foraminiferal species exhibit dimorphism associated with reproduction. The two resultant forms are known as microspheric and megalospheric forms. Culture studies, though limited in number, show that ratios of ... -
Seasonal sea surface temperature contrast between the Holocene and last glacial period in the western Arabian Sea (Ocean Drilling Project Site 723A): Modulated by monsoon upwelling
(AGU, 2005)Annual, summer, and winter sea surface temperatures (SSTs) in the western Arabian Sea were reconstructed through the last 22 kyr using artificial neural networks (ANNs) based on quantitative analyses of planktic foraminifera. ... -
Signals of the change in monsoonal precipitation at around 2,000 years BP in a sediment core off central west coast of India
(Current Science Association, 1994)A 4.80 m long shallow water sediment core, collected from the inner shelf (at 22 m water depth) off Karwar near Kali River mouth is studied for foraminiferal tracers of palaeomonsoons. The climatic history of this core ... -
Significance of relic carbonate deposits along the central and southwestern margin of India for late Quaternary environmental and sea level changes
(Elsevier, 2003)Environmental and sea level indicators were investigated using dredge samples from late Quaternary carbonate deposits along the shelf break between Goa and Cape Comorin, India. Geomorphic features in the area were identified ... -
Some aspects of volcanic ash layers in the Central Indian Basin.
(Springer, 1999)Intercalated volcanic ash layers in two deep-sea sediment cores from the Central Indian Basin (CIB) are examined for the possibility of an in situ source of suboceanic volcanism. An in situ source has been predicated based ... -
Spatial and temporal distribution of foraminifera in sediments off the central west coast of India and use of their test morphologies for the reconstruction of paleomonsoonal precipitation
(Micropaleontology Press, 1999)From the shallow region off the central west coast of India, 21 samples of surface sediments (ranging in depth from 22 to 52 m) along with two sediment cores of 4.80 m and 4.00 m (surface/subsurface) have been analyzed for ... -
Subsurface geology off Bombay with paleoclimatic inferences interpreted from shallow seismic profiles
(Tirunelveli: JCSONLINE, 1987)High resolution seismic reflection profiles nearshore areas off Bombay provide information on subsurface geology and permit certain paleoclimatic inferences. Three sedimentary units overlie the acoustic basement: late ... -
Sulfidization in a shallow coastal depositional setting: Diagenetic and palaeoclimatic implications
(Elsevier, 2012)The nature of pyrite and C–Fe–S geochemistry in a sediment core (covering the last 378 years) at a water depth of 17 m off Goa, west coast, India has been investigated to understand the diagenetic and palaeoclimatic/oceanographic ... -
The beach ridges of India: A review
(Coastal Education and Research Foundation, 2005)An attempt has been made to assemble and synthesize research work conducted on beach ridges and associated geomorphic features around India. Information on location, morphology, origin, and age of beach ridges, has been ...