About Me

I’m a Research Scientist working with Cobb Paleoclimate Research Group at the School of Earth and Atmospheric Science at the Georgia Institute of Technology. Visit the lab site for more information and research opportunities!

My research focuses on investigating how and why the Earth's climate has varied in the past inorder to better inform future climate projections. My work primarily involves reconstructing regional changes in ocean temperature, salinity, and circulation patterns over the last few thousand years by measuring stable isotopes and trace elements in coral skeletons. I’m also interested in the development of new proxies and methodologies to extend and improve our ability to reconstruct past climate, and data assimilation using large networks of proxy records to better understand large-scale patterns of climate change.

Recent Publications

See "Publications & Data" for a full list of publications and links to archived data

Intercolony δ18O and Sr/Ca variability among Porites spp. corals at Palmyra Atoll - Sayani et al, 2019

Cores from living corals are routinely used to extend instrumental temperature and hydrology reconstructions across recent decades to centuries in data-scarce regions of the tropics. Cores from fossil corals can be used to extend such records even further back into the past, with the key assumption that corals growing on the same reef respond to climat ein the exact same way. Here we investigate the reproducibility of two commonly used coral proxies at Palmyra Atoll, quantify potential errors in coral-based climate reconstructions from fossil corals, and provide solutions for reducing these uncertainties.

Enhanced El Niño‐Southern Oscillation variability in recent decades - Grothe et al., 2019

The El Niño/Southern Oscillation (ENSO) is the main source of year-to-year variability in the tropical Pacific and has profound impacts on temperature and rainfall patterns across the planet. Climate models suggest ENSO activity may be changing due to human activity, however, several centuries of records are needed to detect any changes in ENSO. This study provides an updated record of ENSO variability over the last 7,000yrs, which shows a decrease in ENSO variability from 3,000 to 5,000 years ago, and an increase in ENSO strength since the pre-industrial.

Porites coral response to an oceano-graphic and human impact gradient in the Line Islands - Carilli et al, 2017

Rising ocean temperatures are expected to drive mass coral bleaching and mortality events over the next few decades. However, not all coral reefs respond to heat stress in the same way. This study examines the relationship between different oceanographic conditions, local human activity, and the resilience of coral reefs to heat stress across the Line Islands.