Spatial variability in residence time of Beryllium in the Indian Ocean.

Residence time of an element in the ocean is a consequence of its chemical behaviour and the various biogeochemical processes governing its distribution, sources, and sinks. Precise estimation of the residence time of beryllium(Be) is necessary for its application as a tracer for understanding present and paleo-environmental processes. We utilise cosmogenic Be and terrestrially derived Be measurements from surface sediments to estimate the residence time of Be in the Indian Ocean.

Contribution of fossil and biomass-derived secondary organic carbon to winter water-soluble organic aerosols in Delhi, India.

Delhi, among the world's most polluted megacities, is a hotspot of particulate matter emissions, with high contribution from organic aerosol (OA), affecting health and climate in the entire northern India. While the primary organic aerosol (POA) sources can be effectively identified, an incomplete source apportionment of secondary organic aerosol (SOA) causes significant ambiguity in the management of air quality and the assessment of climate change. Present study uses positive matrix factorization analysis on the water-soluble organic aerosol (WSOA) data from the offline-aerosol mass spectrometry (AMS).

Be depositional flux variation in the central Indian Ocean during the last 43 ka.

The advent of Accelerator Mass Spectrometer (AMS) enhanced the application of meteoric Be (half-life of 1.39 Ma) as a tracer for understanding earth surface processes on thousand to million-year time scales. However, for the majority of applications, an adequate understanding of the Be depositional flux is a prerequisite.

Production rate variation and changes in sedimentation rate of marine core dated with meteoric Be and C.

The first measurement of meteoric beryllium-10 (Be) using Accelerator Mass Spectrometer (AMS) is reported from PRL-AURiS (Physical Research Laboratory-Accelerator Unit for Radioisotope Studies). Strategically, the meteoric Be dating method can date events as old as 10 Myr, and its accuracy while dating marine sediment cores has been well tested with magnetic methods. An attempt is made for a comparative study between radiocarbon (C) and meteoric Be dating methods from a 6 m long sediment core collected from the equatorial Indian Ocean.