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Information on Symposia per Science Theme





Theme No.

Theme Title

Number of Symposia proposed

Symposia Title

Symposia Conveners

Biographical sketch of the Conveners

Keywords

Abstract

24

Oceans in a Changing World


Dr. Rajeev Saraswat

rs.niog@gmail.com

(India)


Dr. Sunil Kumar Singh

sunil@nio.org

(India)






5

Spatio-Temporal Variability of Carbon Burial in the Oceans

Dr. Rajeev Saraswat rsaraswat@nio.org

(India)


Dr. Rajeev Saraswat is working as Senior Scientist in the National Institute of Oceanography, Goa. His research interest includes paleoclimate and paleoceanography

Carbon, ocean, sediments, carbonate, organic

Oceans are a large sink of carbon. The ocean sediments contain both inorganic and organic carbon. The abundance of organic and inorganic carbon in marine sediments mainly depends on primary productivity, sediment grain size, dissolved oxygen concentration and depth. As the aforementioned parameters vary regionally, the carbon burial also varies accordingly. Additionally, the temporal variability in these parameters results in a change in carbon burial potential of any region. The assessment of both the spatial and temporal variability in carbon burial in a region is important to understand its potential to modulate global carbon cycling during different boundary conditions. This symposium invitites contributions on documentation of carbon burial during both the present and past, in different parts of the world oceans.

Assessing Coastal Vulnerability in a Warming World

Dr. R. Mani Murali mmurali@nio.org (India)


Dr. Murali is a Senior Scientist in the National Institute of Oceanography, Goa. His research interest includes coastal processes and coastal vulnerability.

Global warming, sea level, coast, vulnerability

A large human population resides in the coastal regions of the tropical countries. The rise in sea level, as well as extreme oceanic events like cyclones, Tsunami and Surges have increased the vulnerability of the coastal regions. Some of the appropriate climate changes and their impacts include accelerated sea-level rise, the increase in the number and intensity of coastal and inland storms, coastal inundation associated with increased precipitation and shoreline erosion. The vulnerability of different coastal regions, however, varies, depending on the elevation of the settlement zone, as well as intensity and frequency of extreme events. The increase in the frequency of extreme events will thus have grave consequences in the form of loss of life and property apart from the adverse effects on the coastal ecosystems. This symposium aims to include remote sensing, modelling and field studies based on approaches to assess the vulnerability of different coastal regions to anthropogenic activities, as well as sea level and extreme events.

Response of Marine Organisms to Ocean Acidification

Haimanti Biswas haimanti.biswas@nio.org

(India)


Suhas Shetye

(India)


Dineshram R

(India)


1. Dr. Biswas is working as a Senior Scientist in the CSIR National Institute of Oceanography, Biological oceanography Division, Goa. Her research interest includes ocean biogeochemistry and the effects of ocean acidification on marine phytoplankton.

2. Dr. Shetye is working as a Scientist in the CSIR National Institute of Oceanography, Goa. His research interest includes ocean biogeochemistry and the effect of ocean acidification on calcareous marine organisms.

3. Dr. Dineshram is working as a Scientist in the CSIR National Institute of Oceanography, Goa. He had extensively worked in experimental marine ecology to study climate change impacts on marine invertebrates at physiology and proteomics levels.

Increasing CO2, ocean acidification, marinebiota, climate change, response study

Over the last century, extensive anthropogenic activities on earth led to an unprecedented increase in the atmospheric CO2 concentration and thus warming our climate. The surface oceans absorb a substantial part of the anthropogenically emitted CO2 and increased accumulation of CO2 in the surface ocean waters is increasing H+ and bicarbonate ion (HCO3-1) concentrations, coupled with decreasing pH [acidification (OA)] and carbonate ion (CO3-2) concentrations. The major shift in dissolved inorganic carbon speciation in surface seawater is affecting calcium carbonate saturation state, which is vital for numerous marine calcifying organisms. There have also been examples of resilient species under low pH condition. Autotrophic organism, like phytoplankton may respond differently to this ocean changes since increasing CO2 may be beneficial to them as a substrate for photosynthesis. Our oceans also experiencing warming and hence, under collective (multi-) stress may become deleterious for marine biota. Further, ocean warming is resulting in major changes in ocean physics which may further change nutrient availability and light penetration. These may have potential to impact the entire food chain, fisheries resources and carbon cycling. This symposium intends to include field and laboratory studies on extent of ocean acidification and its impact on marine ecology, with particular emphasis on Indian waters.

Reconstructing Past Pollution Levels From Marginal Marine Regions

G.N. Nayak gnnayak@unigoa.ac.in

(India)


Rajiv Nigam

(India)


1. Prof. G. N. Nayak is working as Professor, in the Department of Marine Science, Goa University, Goa. His research interest is pollution monitoring and paleoclimate reconstruction.

2. Dr. Rajiv Nigam is working as Emeritus Scientist, in the National Institute of Oceanography, Goa. His research interest is application of foraminiferal proxies.

Geochemistry, Microfossils, pollution, marine, coastal, proxies

Anthropogenic activities result in discharge of various pollutants in the marginal marine regions. The pollutants include heavy metals, persistent organic pollutants and sewage. These pollutants adversely affect marginal marine community and thus severely alter the ecology of the marginal marine regions. The high resolution past records of concentration of various pollutants, can help in assessing the timing and possible anthropogenic activity responsible for increasing pollutant load. This symposium intends to include papers based on the past records of pollutants from marginal marine regions.

Sealevel Changes During Late Pleistocene and Holocene Periods and its Implications of Coastal Landforms.


Dr. V.J. Loveson

vjloveson@nio.org

(India)

Working in sea level changes research for nearly 28 years. He elaborately studied the Quaternary sea level variation along East Coast of India. During 1995-99 Inter-congress period, Dr Loveson functioned as Secretary, INQUA Indian Ocean sub-commission on Sea level variation and coastal evolution.

Sea level, Holocene, marine, transgression, regression

The rise in sea level is an important effect of global warming. The rate of sea level rise, however, varies regionally, due to the local upliftment/subsidence. Besides, natural variability also affects sea level. Therefore, it is important to delineate the natural and anthropogenic contributions to the sea level changes. The past sea level change records from different regions can help in delineation of natural and anthropogenic contribution to the sea level in a warming world. This symposium aims to include modelling and field studies to reconstruct past sea level changes from different parts of the world.