Sudhir Bhadra

Indian Institute of Science | IISC · Centre for Earth Sciences (CEaS)

Planktic foraminifera are amongst the most widely used paleoclimatic proxies. The application of foraminifera for paleoclimatic reconstruction requires knowledge of the ecological preference of species. Here, we report the surface distribution and ecology of planktic foraminifera from 99 core top samples collected from the riverine influx dominated...

The short-term variability in the Indian monsoon is well documented through instrumental records and paleoclimatic studies of the recent geological past. However, the effect of mid-Pleistocene transition (MPT) on the Indian monsoon has not been discussed extensively due to the scarcity of long-term records of changes in monsoon strength. We have us...

The planktic foraminifera are an important component of the global carbon cycle, as they sequester the carbon, thus burying it in the sediments for ages. The burial of planktic foraminiferal shells, however, depends on the carbonate chemistry of the deep ocean. A significant fraction of foraminiferal shells dissolves well above the carbonate compen...

The application of stable oxygen isotopic ratio of surface-dwelling planktic foraminifera Globigerinoides ruber (white variety; δ18Oruber) to reconstruct past hydrological changes requires a precise understanding of the effect of ambient parameters on δ18Oruber. The northern Indian Ocean, with its huge freshwater influx and being a part of the Indo...

The oceans store a substantial fraction of carbon as calcium carbonate (CaCO 3 ) and organic carbon (C org ) and constitute a significant component of the global carbon cycle. The C org and CaCO 3 flux depends on productivity and is strongly modulated by the Asian monsoon in the tropics. Anthropogenic activities are likely to influence the monsoon...

The application of stable oxygen isotopic ratio of surface dwelling Globigerinoides ruber (white variety) (δ18Oruber) to reconstruct past hydrological changes requires precise understanding of the effect of ambient parameters on δ18Oruber. The northern Indian Ocean, with huge freshwater influx and being a part of the Indo-Pacific Warm Pool, provide...

Foraminiferal proxies are often used to understand both pollution and past climatic changes. The freeze-drying is a viable alternative to commonly used method of oven-drying to process marine sediments for foraminiferal studies. The freeze-drying has, however, not yet been tested to process estuarine sediments to study living benthic foraminifera....

The eastern Arabian Sea is influenced by both the advection of upwelled water from the western Arabian Sea and winter convective mixing. Therefore, sediments collected from the eastern Arabian Sea can help to understand the long-term seasonal hydrographic changes. We used the planktonic foraminifera census and stable isotopic ratio (δ ¹⁸ O) from se...

Introduction • The planktic foraminifera have been used extensively to reconstruct seawater properties in the past. • The knowledge of foraminiferal ecology is essential to reconstruct the seawater properties in the past. • The huge freshwater influx in the Bay of Bengal creates a unique ecological environment making it an ideal region to understan...

The faunal (foraminiferal and diatom abundance) and sedimentological analysis was carried out on two cores collected from a coastal lake in the Vestfold Hills region of Antarctica. Out of a couple of cores collected from the same lake, the one closer to the marine inlet, contained abundant foraminifera and the diatoms were dominant in the second co...

Being sensitive to environmental changes, foraminifera have been extensively used to monitor pollution level in the marine environment, including the effect of mining in coastal areas. In the Goa state of India, the rejects from open-cast mining on land, largely find their way to the estuaries, as washout during monsoon. Additionally, the Mormugao...