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<title>DRS at CSIR-National Institute of Oceanography</title>
<link href="https://drs.nio.res.in:443/drs" rel="alternate"/>
<subtitle>The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.</subtitle>
<id xmlns="http://apache.org/cocoon/i18n/2.1">https://drs.nio.res.in:443/drs</id>
<updated>2026-03-06T06:04:40Z</updated>
<dc:date>2026-03-06T06:04:40Z</dc:date>
<entry>
<title>Submarine landslide-triggered methane seepage and the onset of cold seep formation: geochemical and geological evidence</title>
<link href="http://drs.nio.res.in/drs/handle/2264/9619" rel="alternate"/>
<author>
<name>Peketi, A.</name>
</author>
<author>
<name>Zatale, A.</name>
</author>
<author>
<name>Mazumdar, A.</name>
</author>
<author>
<name>Dewangan, P.</name>
</author>
<author>
<name>Mitra, A.</name>
</author>
<author>
<name>Sriram, G.</name>
</author>
<author>
<name>Verma, S.</name>
</author>
<author>
<name>Mishra, Subhashree</name>
</author>
<author>
<name>Mahale, V.</name>
</author>
<author>
<name>Anugrah, C.</name>
</author>
<id>http://drs.nio.res.in/drs/handle/2264/9619</id>
<updated>2026-02-25T11:16:28Z</updated>
<published>2026-01-01T00:00:00Z</published>
<summary type="text">Submarine landslide-triggered methane seepage and the onset of cold seep formation: geochemical and geological evidence
Peketi, A.; Zatale, A.; Mazumdar, A.; Dewangan, P.; Mitra, A.; Sriram, G.; Verma, S.; Mishra, Subhashree; Mahale, V.; Anugrah, C.
A remotely operated vehicle (ROV) expedition coupled with a sub-bottom profiler survey was conducted at a recently reported submarine landslide site located in shallow waters of the Krishna-Godavari basin, Bay of Bengal. Multiple seepage locations were identified, characterised by active gas bubbling, white microbial mats, and black sulfidic sediments. Chemical analysis of dissolved gases at the bubbling site revealed the presence of methane, with significantly enhanced concentrations (~?172 nmol/L) close to the seabed when compared to that of seawaters. The generation of microbial mats is possibly driven by sustained methane seepage at the site. However, there are no signs of the presence of any cold seep ecosystem. The recently activated landslides possibly induced methane seepages due to a drop in lithostatic load at the study site. This study signified the role of submarine landslides in the generation of methane seepages from the seabed. The seep site appears to be in an early, evolving stage of cold seep development, characterized by localized microbial mat formation but lacking a fully developed chemosynthetic ecosystem. This offers an unique opportunity to investigate the biogeochemical dynamics and microbial community structure of a nascent cold seep environments.
IF2024=1.4
</summary>
<dc:date>2026-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>The effect of shoreline changes on the development of coastal tourism</title>
<link href="http://drs.nio.res.in/drs/handle/2264/9611" rel="alternate"/>
<author>
<name>Naik, S.</name>
</author>
<author>
<name>Mandal, S.</name>
</author>
<author>
<name>Mazumdar, J.</name>
</author>
<id>http://drs.nio.res.in/drs/handle/2264/9611</id>
<updated>2026-02-25T11:16:27Z</updated>
<published>2026-01-01T00:00:00Z</published>
<summary type="text">The effect of shoreline changes on the development of coastal tourism
Naik, S.; Mandal, S.; Mazumdar, J.
The shoreline dynamics significantly influence the stability and growth of coastal tourism, particularly in areas where tourism is a primary economic driver. Present study evaluates shoreline changes along the Goan coast between 1995 and 2023 and their effects on coastal tourism. The study utilizes CoastSat, an open-source, Python-based framework integrated with Google Earth Engine (GEE) for shoreline extraction and subsequent tidal correction. Shoreline change rates are computed using digitized shore-normal transects, and a regression-based shoreline trend analysis was undertaken for 37 key beaches. A Digital Shoreline Analysis System (DSAS) uncertainty evaluation was performed for three representative sites (Keri, Baina, Caranzalem) to validate CoastSat-derived trends and incorporate confidence intervals for validation. The results indicate substantial spatial variability, with 26.37?% of the shoreline classified as stable, 9.24?% is undergoing erosion (e.g., Querim: ?1.72?m/yr; Sinquerim: ?1.36?m/yr), 8.55?% is accreting (e.g., Caranzalem: +3.65?m/yr; Baga: +1.49?m/yr), and 52.57?% of the coastline is comprised of rocky coast. Beaches such as Querim, Mandrem, Candolim, Anjuna, Sinquerim, Betalbatim, Varca, and Talpona are particularly susceptible to shoreline retreat, which might endanger the infrastructure supporting tourism. Additionally, to identify tourism pressure on erosive beaches, a spatial overlay study was conducted that integrated coastal shoreline trend with known tourism indicators (footfall, carrying capacity, available beach area, and shack density). However, beaches that are stable and accreting may provide chances for controlled tourism growth. The results provide clear guidance for coastal management by identifying tourism hotspots affected by erosion and areas suitable for controlled, sustainable tourism development
IF2024=2.4
</summary>
<dc:date>2026-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Orbital forcing regulated Arabian Sea denitrification during the late Pleistocene</title>
<link href="http://drs.nio.res.in/drs/handle/2264/9610" rel="alternate"/>
<author>
<name>Pawar, R.</name>
</author>
<author>
<name>Singh, D. P.</name>
</author>
<author>
<name>Saraswat, R.</name>
</author>
<author>
<name>Maurya, A. S.</name>
</author>
<id>http://drs.nio.res.in/drs/handle/2264/9610</id>
<updated>2026-02-25T11:16:27Z</updated>
<published>2026-01-01T00:00:00Z</published>
<summary type="text">Orbital forcing regulated Arabian Sea denitrification during the late Pleistocene
Pawar, R.; Singh, D. P.; Saraswat, R.; Maurya, A. S.
To limit global warming to within 2�C, it is essential to understand the contribution of non-carbon dioxide greenhouse gases. Nitrous oxide (N2O), a potent greenhouse gas, has played a significant role in the recent climate change. Therefore, understanding its long-term evolution is crucial to develop effective mitigation strategies. In this study, we reconstruct the long-term history of the Arabian Sea denitrification, a major natural source of atmospheric N2O, using a marine sediment core SSD004 GC11 from the southern Arabian Sea, spanning the last 167,000 years. To trace the past denitrification history, we analysed the nitrogen isotopic composition (?15N), an indicator of denitrification and total nitrogen content (TN). Our results show a strong coupling between primary productivity and denitrification during warm intervals, however, this relationship weakens during cold intervals, despite productivity being sustained by winter monsoon-driven vertical mixing. We integrated the newly generated ?15N record with previously published records to construct a basin-wide Arabian Sea denitrification stack. The spectral analysis reveals dominant periodicity synchronous with Earth's orbital parameters, particularly obliquity and precession. Notably, obliquity signal is stronger in the southern Arabian Sea, while precession signal dominates the northern records. A cross-wavelet analysis of our core ?15N record, the Arabian Sea ?15N stack, and atmospheric N2O concentration shows a significant influence of obliquity-driven processes on regional denitrification and atmospheric N2O levels. These findings highlight the pivotal role of orbital forcing in regulating nitrogen cycling in the Arabian Sea and its broader impact on greenhouse gas dynamics.
IF2024=4.0
</summary>
<dc:date>2026-01-01T00:00:00Z</dc:date>
</entry>
<entry>
<title>Alpheus madhusoodanai sp. nov.: a new species of mangrove associated snapping shrimp of genus Alpheus Fabricius, 1798 (Decapoda: Caridea: Alpheidae) from southwest coast of India</title>
<link href="http://drs.nio.res.in/drs/handle/2264/9627" rel="alternate"/>
<author>
<name>Vishnu, K.</name>
</author>
<author>
<name>Deepak, J.</name>
</author>
<author>
<name>Nidhin, B.</name>
</author>
<author>
<name>Abhai Krishna, U.</name>
</author>
<author>
<name>Harikrishnan, M.</name>
</author>
<id>http://drs.nio.res.in/drs/handle/2264/9627</id>
<updated>2026-02-25T11:16:28Z</updated>
<published>2026-01-01T00:00:00Z</published>
<summary type="text">Alpheus madhusoodanai sp. nov.: a new species of mangrove associated snapping shrimp of genus Alpheus Fabricius, 1798 (Decapoda: Caridea: Alpheidae) from southwest coast of India
Vishnu, K.; Deepak, J.; Nidhin, B.; Abhai Krishna, U.; Harikrishnan, M.
The present account describes a new species of alpheid shrimp, Alpheus madhusoodanai sp. nov., belonging to the brevirostris group, collected from the Cochin estuary, the south west coast of India. This represents the first species of alpheid shrimps described from the estuary. The morphological and molecular characteristics of the new species are compared with those of its closely related congeners. The newly described species is separated from its morphological congener A. rapax, by its wider major chela and longer merus of the first cheliped. Molecular data also confirmed the delimitation of A. rapax with A. madhusoodanai sp. nov. Habitat and distribution details are also discussed, highlighting the potential for further taxonomic exploration in the Cochin estuary and the importance in uncovering its hidden biodiversity.
IF2024=0.9
</summary>
<dc:date>2026-01-01T00:00:00Z</dc:date>
</entry>
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