Lettie Roach

Polar climate and sea ice scientist

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About Me

I am a Postdoctoral Research Associate in the Department of Atmospheric Sciences at the University of Washington, Seattle.

I am broadly interested in Earth's climate system, with a focus on the polar regions. My research topics include polar climate change and variability, sea ice physics and ocean-sea ice interactions, in both the Arctic and Antarctic. I typically use climate models of varying levels of complexity, in combination with satellite and in-situ observations.

My background is in physics. I hold an undergraduate Masters (MPhys) in Mathematical Physics from the University of Edinburgh. In 2016, I moved to the other side of the world and began working on sea ice modelling at the National Institute of Water and Atmospheric Research and Victoria University of Wellington, New Zealand, completing my PhD in 2019.

Pancake sea ice in the Ross Sea, Antarctica

Projected change in near-surface air temperature by the end of the 21st century (CESM2 SSP2-4.5, 2099-2090 minus 2020-2029)

Publications

See also:

[14] Hosekova, L., Malila, M. P., Rogers, W. E., Roach, L. A., Eidam, E., Rainville, L., Kumar, N., and Thomson, J., Attenuation of ocean surface waves in pancake and frazil sea ice along the coast of the Chukchi Sea (2020). Journal of Geophysical Research: Oceans, 125, e2020JC016746. https://doi.org/10.1029/2020JC016746

[13] Blanchard-Wrigglesworth, E., Roach, L. A., Donohoe, A., and Ding, Q. (2020). Impact of winds on Antarctic sea ice trends and variability. Journal of Climate, 1-47. https://doi.org/10.1175/JCLI-D-20-0386.1

[12] Kohout, A., Smith, M., Roach, L. A., Williams, G., Montiel, F., & Williams, M. (2020). Observations of exponential wave attenuation in Antarctic sea ice during the PIPERS campaign. Annals of Glaciology, 1-14. https://doi.org/10.1017/aog.2020.36

[11] Ackley, S. F., Stammerjohn, S., Maksym, T., Smith, M. M., Cassano, J., Guest, P., Tison, J.-L., Delille, B., Loose, B., Sedwick, P., DePace, L., Roach, L. A., and Parno, J. (2020). Sea ice production and air-ice-ocean-biogeochemistry interactions in the Ross Sea during the PIPERS 2017 autumn field campaign. Annals of Glaciology, 1-15. https://doi.org/10.1017/aog.2020.31

[10] Bracegirdle, T. J., Krinner, G., Tonelli, M., Haumann, F. M., Naughten, K. A., Rackow, T., Roach, L. A., and Wainer, I. (2020). Twenty first century changes in Antarctic and Southern Ocean surface climate in CMIP6. Atmospheric Science Letters, e984. https://doi.org/10.1002/asl.984

[9] Roach, L. A., Dörr J., Holmes, C. R., Massonnet, F., Blockley, E. W., Notz, D., Rackow, T., Raphael, M. N., O’Farrell, S. P., Bailey, D. A., and Bitz, C. M. (2020). Antarctic sea ice area in CMIP6. Geophysical Research Letters, 47, e2019GL086729. https://doi.org/10.1029/2019GL086729. [Download paper]. [Download Supplementary].

[8] Sea Ice Modelling Intercomparison Project Community [30 co-authors inc. Roach, L. A.] (2020). Arctic sea ice in CMIP6. Geophysical Research Letters, 47, e2019GL086749. https://doi.org/10.1029/2019GL086749

[7] Horvat, C., Flocco, D., Rees Jones, D. A., Roach, L. A., and Golden, K. M. (2020). The effect of melt pond geometry on the distribution of solar energy under first‐year sea ice. Geophysical Research Letters, 47. https://doi.org/10.1029/2019GL085956

[6] Roach, L. A., Bitz, C. M., Horvat, C., and Dean, S. M. (2019). Advances in modelling interactions between sea ice and ocean surface waves. Journal of Advances in Modeling Earth Systems, 11, 4167– 4181. https://doi.org/10.1029/2019MS001836

[5] Horvat, C., Roach, L. A., Tilling, R., Bitz, C. M., Fox-Kemper, B., Guider, C., Hill, K., Ridout, A., and Shepherd, A. (2019). Estimating the sea ice floe size distribution using satellite altimetry: theory, climatology, and model comparison. The Cryosphere, 13, 2869–2885. https://doi.org/10.5194/tc-13-2869-2019

[4] Roach, L. A., Horvat, C., Dean, S. M., and Bitz, C. M. (2018). An emergent sea ice floe size distribution in a global coupled ocean–sea ice model. Journal of Geophysical Research: Oceans, 123(6), 4322-4337. https://doi.org/10.1029/2017JC013692

[3] Roach, L. A., Smith, M. M., and Dean, S. M. (2018). Quantifying growth of pancake sea ice floes using images from drifting buoys. Journal of Geophysical Research: Oceans, 123(4), 2851-2866. https://doi.org/10.1002/2017JC013693

[2] Roach, L. A., Dean, S. M., and Renwick, J. A. (2018). Consistent biases in Antarctic sea ice concentration simulated by climate models. The Cryosphere, 12(1), 365-383. https://doi.org/10.5194/tc-12-365-2018

[1] Roach, L. A., Tett, S. F. B., Mineter, M. J., Yamazaki, K., and Rae, C. D. (2017). Automated parameter tuning applied to sea ice in a global climate model. Climate Dynamics, 50(1-2), 51-65. https://doi.org/10.1007/s00382-017-3581-5

Contact

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