Sciences and Exploration Directorate

Lettie Roach

(Associate Research Scientist)

Lettie Roach's Contact Card & Information.
Org Code: 611
Mail Code 611
New York, NY 10025

Brief Bio

I am an Associate Research Scientist at the Center for Climate Systems Research, Columbia University based at NASA Goddard Institute for Space Studies (GISS) in New York City.

I am broadly interested in Earth's climate system, with a focus on the polar regions. My research is motivated by a desire to understand the physics of coupled interactions between ice and climate. I typically work with climate models of varying levels of complexity, in combination with observations, aiming to improve climate projections.


Postdoctoral Research Associate

University of Washington - Seattle

2019 - 2021

Associate Research Scientist

NASA GISS/Columbia University - New York City

2021 - Present


2016-2019 Geophysics PhD, Victoria University of Wellington

2011-2015 Mathematical Physics MPhys, University of Edinburgh

Selected Publications


2023. "Asymmetry in the Seasonal Cycle of Zonal‐Mean Surface Air Temperature." Geophysical Research Letters 50 (10): [10.1029/2023gl103403] [Journal Article/Letter]

2023. "Modulation of the seasonal cycle of the Antarctic sea ice extent by sea ice processes and feedbacks with the ocean and the atmosphere." The Cryosphere 17 (1): 407-425 [10.5194/tc-17-407-2023] [Journal Article/Letter]

2022. "The Impact of Winds on AMOC in a Fully‐Coupled Climate Model." Geophysical Research Letters 49 (24): [10.1029/2022gl101203] [Journal Article/Letter]

2022. "Wind waves in sea ice of the western Arctic and a global coupled wave-ice model." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 380 (2235): [10.1098/rsta.2021.0258] [Journal Article/Letter]

2022. "Physical Drivers of Ocean Wave Attenuation in the Marginal Ice Zone." Journal of Physical Oceanography 52 (5): 889-906 [10.1175/jpo-d-21-0240.1] [Journal Article/Letter]

2022. "Asymmetry in the seasonal cycle of Antarctic sea ice driven by insolation." Nature Geoscience 15 (4): 277-281 [10.1038/s41561-022-00913-6] [Journal Article/Letter]

2022. "Observed Winds Crucial for September Arctic Sea Ice Loss." Geophysical Research Letters 49 (6): [10.1029/2022gl097884] [Journal Article/Letter]

2022. "WIFF1.0: a hybrid machine-learning-based parameterization of wave-induced sea ice floe fracture." Geoscientific Model Development 15 (2): 803-814 [10.5194/gmd-15-803-2022] [Journal Article/Letter]

2020. "Arctic Sea Ice in CMIP6." Geophysical Research Letters 47 [10.1029/2019gl086749] [Journal Article/Letter]

2019. "Estimating the sea ice floe size distribution using satellite altimetry: theory, climatology, and model comparison." The Cryosphere 13 (11): 2869-2885 [10.5194/tc-13-2869-2019] [Journal Article/Letter]