Kaustubh Thirumalai

Forty Years of Looking to Earth's Past to Understand Its Future

Sarah Feakins, Ursula R�hl, Kaustubh Thirumalai

From ancient greenhouse worlds to ice ages, Earth's past offers vital clues to its future. Explore the 40th anniversary special collection from Paleoceanography and Paleoclimatology.

Introducing Research Letters in Paleoceanography and Paleoclimatology

Kaustubh Thirumalai, Ursula R�hl, Sarah Feakins

Paleoceanography and Paleoclimatology now offers Research Letters, a new format for brief, timely, scientific communications, launched on the journal’s 40th anniversary.

Introduction to a Special Collection: Illustrating the Breadth of Paleoceanography and Paleoclimatology at the Journal's 40‐year Anniversary

Sarah J. Feakins, Ursula Röhl, Kaustubh Thirumalai

Abstract This special collection celebrates the 40th anniversary of Paleoceanography and Paleoclimatology and highlights the breadth, impact, and frontiers in paleoenvironmental research. Since the journal's founding in 1986 as Paleoceanography , the field has expanded from its early emphasis on marine sedimentary …

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Gridded Common Era hydroclimate products are inconsistent in reproducing 20th-Century Indian Monsoon Variability

Aniket Dhar, Kaustubh Thirumalai, Soumaya Belmecheri, Judson W Partin et autres

Recent advances in paleoclimate data assimilation (paleo-DA) have produced gridded reconstructions of Indian monsoon hydroclimate variability over the Common Era, yet their consistency with one another and with instrumental records has not been systematically investigated. Here we evaluate the Monsoon Asia Drought …

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Opposing hydroclimate extremes in Central and mainland Southeast Asia over past millennium

Na Wang, Sylvia Dee, Jun Hu, Kaustubh Thirumalai

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Arabian Sea stratification and deoxygenation driven by weakening monsoon winds over the Holocene

Ponnusamy Saravanan, Kaustubh Thirumalai, Xiangzhong Li, Ravi Mishra et autres

Seasonal stratification in the Arabian Sea, driven by monsoon dynamics, fuels one of the planet’s most productive marine ecosystems while intensifying oxygen minimum zones—an interplay with biogeochemical implications, yet its long-term influence on upper-ocean stratification and oxygenation remains uncertain. Here, we present …

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Spatial and Temporal Variability of Eastern Pacific Radiocarbon and Carbon Chemistry From the Ice Age to Today

Patrick A. Rafter, Mathis P. Hain, Elsa Arellano‐Torres, Kaustubh Thirumalai et autres

Abstract Proxy records of seawater radiocarbon ( 14 C/C) provide strong constraints on how changes in ocean ventilation contributed to the increase in atmospheric CO 2 during the termination of the last ice age (≈18,000‐to‐12,000 years ago). One outstanding problem, however, is …

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Supplementary material to "Assessing the potential of Individual Foraminifera Analyses (δ 18 O) to reconstruct variability, seasonality and extremes in the tropical Indian Ocean"

Yohan Lichterfeld, Guillaume Leduc, Kaustubh Thirumalai, Laurence Vidal et autres

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Assessing the potential of Individual Foraminifera Analyses (δ 18 O) to reconstruct variability, seasonality and extremes in the tropical Indian Ocean

Yohan Lichterfeld, Guillaume Leduc, Kaustubh Thirumalai, Laurence Vidal et autres

Abstract. The Indian Ocean plays a critical role in the global climate system by regulating heat and moisture transport, influencing major fluxes that drive atmospheric circulation. Individual foraminiferal analyses (IFA) of the stable oxygen isotope composition (δ18O) of their test provides a …

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Andean volcanism, ocean fertilization, marine ecosystem turnover, and global cooling in the Late Miocene

Bárbara Carrapa, Mark T. Clementz, Nicolás J. Cosentino, Pedro DiNezio et autres

As the world’s longest active volcanic arc, the Andes deliver nutrient-rich volcanic ash directly to the ocean via atmospheric transport. This ash supplies key limiting nutrients to the Humboldt Current and the Southern Ocean, both critical for biological productivity, nutrient cycling, and …

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The anatomy of the Indian summer monsoon variability during the penultimate deglaciation (Termination II)

Gayatri Kathayat, Kaustubh Thirumalai, Tan Liangcheng, Xiyu Dong et autres

AbstractPrecisely dated East Asian summer monsoon (EASM) speleothem δ¹⁸O records frequently mirror Greenland ice-core variability during deglaciation and stadial–interstadial transitions, however, pronounced regional heterogeneity is evident, particularly during the penultimate deglaciation (Termination II; TII). Not all records align, and mismatches are often …

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Rainfall Reconstruction through Isotope Signatures of Mollusc Micro-fossils from a Late Holocene Archaeological Site in North West India

Ritvik Chaturvedi, Narender Parmar, Anil K. Pokharia, Pankaj Singh Baghel et autres

Mollusc shells, though often microscopic in size, are preserved ubiquitously in archaeological sites due to their robust calcareous composition that withstands post-depositional stresses. Invariably, ‘flotation’ – a method used conventionally to retrieve botanical remains in archaeological sites – also usually recovers tiny …

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