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My research focuses on Earth's climate variability and paleoceanography. I am interested in learning about the causes and mechanisms of past fluctuations in the ocean and atmosphere, and how such information can help us anticipate future changes. To do so, I use a combination of observations, geochemical proxy measurements, and modeling simulations to identify and investigate important processes at play in the Earth-climate system. Primarily, my work involves stable isotopic and trace metal geochemistry of (mainly) carbonate archives (e.g. corals/foraminifera/snails/stalagmites) as well as the analysis of climate model simulations. I am also interested in extreme climate events and hazards (earthquakes, flooding, heatwaves, sea-level changes), and how the geological record can help inform future projections.
Ongoing research projects include Indo-Pacific climate change, reconstructing Atlantic Ocean circulation anomalies, Indian paleomonsoon variability, and uncertainty in proxy-model comparisons. Please email reach out via email if you’re an undergraduate student seeking research experience, a potential M.S./Ph.D. student, or if you’d like to explore postdoctoral options.Show Less
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Courses
- PPaleoclimatology
- PPaleontology
- THECThe History of Earth's Climate
- IOIntroduction to Oceanography
- SIGPStable Isotope Geochemistry and Paleoclimate
Grants
- Collaborative Research: Tracing Pacific Ocean Circulation and Ventilation During the Warm Pliocene Epoch
Co-Investigator (COI)
2023
$544.8K
Active - Track 2 MRI: Acquisition of a mini carbon dating system for multi-millennial, multi-user sequences of annually resolved 14C and other high precision applications
Co-Investigator (COI)
2022
$2.0M
Active - Track 2 MRI: Acquisition of a mini carbon dating system for multi-millennial, multi-user sequences of annually resolved 14C and other high precision applications
Co-Investigator (COI)
2022
$752.0K
Active - REU Site: From the clouds to the core: A place-based REU for southwestern US community/tri bal college students to increase under-represented group recruitment to the geosciences
Co-Investigator (COI)
2022
$133.6K
Active - Collaborative Research: P2C2--Subdecadal Pleistocene Indian Monsoon Variability: A Dual Archive Perspective
Principal Investigator (PI)
2021
$416.6K
Active - Collaborative Research: P2C2 - Variability, Impacts and Extremes of the ENSO-Asian Monsoon Relationship over the Common Era
Principal Investigator (PI)
2021
$46.0K
Active - Collaborative Research: Testing The Indian Ocean El Nino Hypothesis
Principal Investigator (PI)
2019
$394.5K
Active - Geochemical Reconstructions of Tropical-to-Subtropical Atlantic Ocean Climate Variability
Principal Investigator (PI)
2019
$75.0K
Active - Collaborative Research: Global Ocean Repeat Hydrography, Carbon, and Tracer Measurements, 2015-2020
Principal Investigator (PI)
2021
$8.3K
News
- Climate Change Could Reawaken Indian Ocean El Niño
2020
Publications (60)
Recent
- span style= font-size:12pt; Hydrologic controls on individual ostracode stable isotopes in a desert lake: a modern baseline for Lake Turkana /span
2022
- When Eastern India Oscillated Between Desert Versus Savannah‐Dominated Vegetation
2022
- Remote and local drivers of Pleistocene South Asian summer monsoon precipitation: A test for future predictions
2021
- Abrupt Southern Great Plains thunderstorm shifts linked to glacial climate variability
2021
- Unprecedented drought in South India and recent water scarcity
2021
- Paleovegetation dynamics in an alternative stable states landscape in the montane Western Ghats, India
2021
- Uncertainty in palaeosalinity estimates from foraminiferal geochemical records in the northern Indian Ocean
2021
- Orbitally driven evolution of Asian monsoon and stable water isotope ratios during the Holocene: Isotope-enabled climate model simulations and proxy data comparisons
2021
- Discerning Changes in High-Frequency Climate Variability Using Geochemical Populations of Individual Foraminifera
2021
- Holocene Evolution of Sea-Surface Temperature and Salinity in the Gulf of Mexico
2021
- Methane, Monsoons, and Modulation of Millennial‐Scale Climate
2020
- Palaeoclimate perspectives on the Indian Ocean Dipole
2020
- Evolution of the Oligotrophic West Pacific Warm Pool During the Pliocene‐Pleistocene Boundary
2020
- Emergence of an equatorial mode of climate variability in the Indian Ocean
2020
- Author Correction: Future exacerbation of hot and dry summer monsoon extremes in India
2020
- Indian subcontinent hydroclimate and vegetation changes during the last glacial reconstructed by leaf wax stable isotope and pollen analyses on sediments from IODP Site U1446, NW Bay of Bengal
2020
- Paleovegetation dynamics in a montane vegetation mosaic in the Western Ghats, India: evidence for alternative stable states in the past?
2020
- Monsoon reconstructions using bulk and individual foraminiferal analyses in marine sediments offshore India
2020
- Past climates inform our future
2020
- A Brief Commentary on the Interpretation of Chinese Speleothem δ¹⁸O Records as Summer Monsoon Intensity Tracers
2020
- Evolution of the oligotrophic West Pacific Warm Pool during the Pliocene
2020
- Lessons from a high-CO 2 world: an ocean view from~ 3 million years ago
2020
- Future exacerbation of hot and dry summer monsoon extremes in India
2020
- The Climate Data Toolbox for MATLAB
2019
- It's Time to Shift Emphasis Away from Code Sharing
2019
- Bayesian calibration of the Mg/Ca paleothermometer in planktic foraminifera
2019
- A century of reduced ENSO variability during the Medieval Climate Anomaly
2019
- Methane, Monsoons, and Modulation of Millennial-scale Climate
2019
- A comment on 'On the validity of foraminifera-based ENSO reconstructions' by Kaustubh Thirumalai
2019
- PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data
2019
- An El Niño Mode in the Glacial Indian Ocean?
2019
- Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap
2019
- Considerations for Globigerinoides ruber (white and pink) paleoceanography: comprehensive insights from a long-running sediment trap
2019
- Significant seasonal contrast in the Arabian Sea during deglaciation: Evidence from oxygen isotopic analyses of individual planktic foraminifera
2019
- Neoglacial Climate Anomalies and the Harappan Metamorphosis
2018
- Supplementary material to "Neoglacial Climate Anomalies and the Harappan Metamorphosis"
2018
- Single foraminifera Mg/Ca analyses of past glacial-interglacial temperatures derived from G. ruber sensu stricto and sensu lato morphotypes
2018
- A fresh take on ancient climate change in the North Pacific
2018
- Interactive comment on ``Re-examining the 4.2 ka BP event in foraminifer isotope records from the Indus River delta in the Arabian Sea'' by Alena Giesche et al.
2018
- Multi-species coral Sr/Ca-based sea-surface temperature reconstruction using Orbicella faveolata and Siderastrea siderea from the Florida Straits
2017
- Modeling the stable water isotope expression of El Ni~no in the Pliocene: Implications for the interpretation of proxy data
2017
- Extreme Monsoon Rainfall Signatures Preserved in the Invasive Terrestrial Gastropod Lissachatina fulica
2017
- Extreme temperatures in Southeast Asia caused by El Niño and worsened by global warming
2017
- A global multiproxy database for temperature reconstructions of the Common Era
2017
- Expedition 353 methods
2016
- Potential for paleosalinity reconstructions to provide information about AMOC variability
2016
- Relative sea-level changes during the last century recorded by coral microatolls in Belloc, Haiti
2016
- Early onset of industrial-era warming across the oceans and continents
2016
- Constraining past seawater $δ$18O and temperature records developed from foraminiferal geochemistry
2016
- Oyster reef die-offs in stratigraphic record of Corpus Christi Bay, Texas, possibly caused by drought-driven extreme salinity changes
2015
- The use of $δ$13C values of leporid teeth as indicators of past vegetation
2015
- Robust global ocean cooling trend for the pre-industrial Common Era
2015
- Variable Holocene deformation above a shallow subduction zone extremely close to the trench
2015
- Stable carbon isotopes in dissolved inorganic carbon: extraction and implications for quantifying the contributions from silicate and carbonate weathering in the Krishna River system during peak discharge
2014
- Globigerinoides ruber morphotypes in the Gulf of Mexico: A test of null hypothesis
2014
- Persistent decadal-scale rainfall variability in the tropical South Pacific Convergence Zone through the past six centuries
2013
- Statistical constraints on El Ni~no Southern Oscillation reconstructions using individual foraminifera: A sensitivity analysis
2013
- Climate Change in the Marine Realm: "An International Summer School in the Framework of the European Campus of Excellence"
2013