Publications – Ryan Lab

Also see Google Scholar for the most up-to-date list.

*denotes student advisee.

2024

Ryan, J. C.: Contribution of surface and cloud radiative feedbacks to Greenland Ice Sheet meltwater production during 2002–2023. Communications Earth & Environment, doi:10.1038/s43247-024-01714-y.

Ryan, J. C., Ross, T., Cooley, S. W., Fahrner, D., Abib, N., Benson, V. & Sutherland, D.: Retreat of the Greenland Ice Sheet leads to divergent patterns of reconfiguration at its freshwater and tidewater margins. Journal of Glaciology, doi:10.1017/jog.2024.61.
Cooley, S. W., & Ryan, J. C.: Community-scale changes to landfast ice along the coast of Alaska over 2000-2022. Environmental Research Letters, 19(2), 024013, doi:10.1088/1748-9326/ad1c7b.

2023

*Goldstein, S. N., Ryan, J. C., How, P. R., Esenther, S. E., Pitcher, L. H., LeWinter, A. L., Overstreet, B. T., Kyzivat, E. D., Fayne, J. V. & Smith, L. C.: Proglacial river stage derived from georectified time-lapse camera images, Inglefield Land, Northwest Greenland. Frontiers in Earth Science, 11, 960363, doi:10.3389/feart.2023.960363.
Ryan, J. C., Medley, B., Stevens, C. M., Sutterley, T. C., & Siegfried, M. R.: Role of snowfall versus air temperatures for Greenland Ice Sheet melt‐albedo feedbacks. Earth and Space Science, 10(11), e2023EA003158. doi:10.1029/2023EA003158
Ryan, J. C., Do urban golf courses provide barriers to equitable greenspace access in the United States? Annals of the American Association of Geographers, 113(5), 1057-1070, doi:10.1080/24694452.2023.2166011.
Esenther, S. E., Smith, L. C., LeWinter, A., Pitcher, L. H., Overstreet, B. T., Kehl, A., Onclin, C., Goldstein, S. N. & Ryan, J. C.: New proglacial meteorology and river stage observations from Inglefield Land and Pituffik, NW Greenland. Geoscientific Instrumentation, Methods and Data Systems, 12(2), 215-230, doi:10.5194/gi-12-215-2023.

2022

Ryan, J. C., Egede Dahl, P., Dale, B.: Co-production of sea ice knowledge in Uummannaq Bay, Greenland. Oceanography, 35(2), doi:10.5670/oceanog.2022.106.
Allgaier, M., Cooper, M. G., Carlson, A. E., Cooley, S. W., Ryan, J. C., & Smith, B. J.: Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR. Journal of Glaciology, 1-1, doi:10.1017/jog.2022.34.
Ryan, J. C., Smith, L. C., Cooley, S. W., Pearson, B., Wever, N., Keenan, E., & Lenaerts, J. T. M.: Decreasing surface albedo signifies a growing importance of clouds for Greenland Ice Sheet meltwater production. Nature Communications, 13(1), 1-8, doi:10.1038/s41467-022-31434-w.

2021

Gleason, C. J., Yang, K., Feng, D., Smith, L. C., Liu, K., Pitcher, L. H., Chu, V. W., Cooper, M. G., Overstreet, B. T., Rennermalm, Å. K. and Ryan, J. C.: Hourly surface meltwater routing for a Greenlandic supraglacial catchment across hillslopes and through a dense topological channel network. The Cryosphere, 15(5), 2315-2331, doi:10.5194/tc-15-2315-2021.
Irvine-Fynn, T. D., Edwards, A., Stevens, I. T., Mitchell, A. C., Bunting, P., Box, J. E., Cameron, K. A., Cook, J. M., Naegeli, K., Rassner, S. M., Ryan, J.C., Stibal, M., Williamson, C. J. and Hubbard, A.: Storage and export of microbial biomass across the western Greenland Ice Sheet. Nature Communications, 12(1), 1-11. doi:10.1038/s41467-021-24040-9.
Irvine-Fynn, T. D., Bunting, P., Cook, J. M., Hubbard, A., Barrand, N. E., Hanna, E., Hardy, A. J., Hodson, A. J., Holt, T. O., Huss, M., McQuaid, J. B., Nilsson, J., Naegeli, K., Roberts, O., Ryan, J. C., Tedstone, A. J., Tranter, M., Williamson, C. J.: Temporal variability of surface reflectance supersedes spatial resolution in defining Greenland’s bare-ice albedo. Remote Sensing, 14(1), doi:10.3390/rs14010062.
*Steiro, V. D., Ryan, J. C., Cooley, S. W., Smith, L. C., Dale, B., Lynch, A. H. and Veland, S.: Changes in sea ice travel conditions in Uummannaq Fjord, Greenland (1985–2019) assessed through remote sensing and transportation accessibility modeling. Polar Geography, 1-15, doi:10.1080/1088937X.2021.1938271.
Smith, L. C., Andrews, L. C., Pitcher, L. H., Overstreet, B. T., Rennermalm, Å. K., Cooper, M. G., Cooley, S. W., Ryan, J. C., Miège, C., Kershner, C. and Simpson, C. E.: Supraglacial river forcing of subglacial water storage and diurnal ice sheet motion. Geophysical Research Letters, 48(7), doi:10.1029/2020GL091418.
Cooley, S. W., Ryan, J. C. and Smith, L. C.: Human alteration of global surface water storage variability. Nature, 591, 78–81, doi:10.1038/s41586-021-03262-3. Press release.

2020

Fettweis, X., Hofer, S., Krebs-Kanzow, U., Amory, C., Aoki, T., Berends, C. J., Born, A., Box, J. E., Delhasse, A., Fujita, K., Gierz, P., Goelzer, H., Hanna, E., Hashimoto, A., Huybrechts, P., Kapsch, M., King, M. D., Kittel, C., Lang, C., Langen, P. L., Lenaerts, J., Liston, G. E., Lohmann, G., Mernild, S. H., Mikolajewicz, U., Modali, K., Mottram, R. H., Niwano, M., Noël, B., Ryan, J. C., Smith, A., Streffing, J., Tedesco, M., Van de Berg, W. J., Van den Broeke, M., Van De Wal, R. S. W., Van Kampenhout, L., Wilton, D., Wouters, B., Ziemen, F. and Zolles, T.: GrSMBMIP: Intercomparison of the modelled 1980–2012 surface mass balance over the Greenland Ice sheet. The Cryosphere, 14(11), doi:10.5194/tc-14-3935-2020.
Ryan, J. C., Smith, L. C., Cooley, S. W., Pitcher, L. H. and Pavelsky, T. M.: Global characterization of inland water reservoirs using ICESat‐2 altimetry and climate reanalysis. Geophysical Research Letters, 47, doi:10.1029/2020GL088543.
Cooley, S. W., Ryan, J. C., Smith, L. C., Horvat, C., Pearson, B., Dale, B. and Lynch, A. H.: Coldest Canadian Arctic communities face greatest reductions in shorefast sea ice. Nature Climate Change, 1-6, doi:10.1038/s41558-020-0757-5. Press release.
Pitcher, L. H., Smith, L. C., Gleason, C. J., Miège, C., Ryan, J. C., Hagedorn, B., van As, D., Chu, W. and Forster, R. R.: Direct observation of winter meltwater drainage from the Greenland Ice Sheet. Geophysical Research Letters, 47(9), doi:10.1029/2019GL086521. Press release.
Ryan, J. C., Smith, L. C., Wu, M., Cooley, S. W., Miège, C., Montgomery, L. N., Koenig, L.S., Fettweis, X., Noel, B. P. and van den Broeke, M. R.: Evaluation of CloudSat’s Cloud‐Profiling Radar for mapping snowfall rates across the Greenland Ice Sheet. Journal of Geophysical Research: Atmospheres, 125(4), doi:10.1029/2019JD031411.
Cook, J. M., Tedstone, A. J., Williamson, C., McCutcheon, J., Hodson, A. J., Dayal, A., Skiles, M., Hofer, S., Bryant, R., McAree, O., McGonigle, A., Ryan, J. C., Anesio, A. M., Irvine-Fynn, T. D. L., Hubbard, A. Hanna, E., Flanner, M^., Mayanna, S., Benning, L. G., van As, D., Yallop, M., McQuaid, J. B., Gribbin, T., Tranter, M.: Glacier algae accelerate melt rates on the south-western Greenland Ice Sheet, The Cryosphere, 14, 309–330, doi:10.5194/tc-14-309-2020.

2019

Jouvet, G., Weidmann, Y., van Dongen, E., Luethi, M., Vieli, A., Ryan, J. C.: High-endurance UAV for monitoring calving glaciers: Application to the Inglefield Bredning and Eqip Sermia, Greenland, Frontiers in Earth Science, 7, doi:10.3389/feart.2019.00206.
Ryan, J. C., Smith, L. C., van As, D., Cooley, S. W., Cooper, M. G., Pitcher, L., and Hubbard, A. L.: Greenland Ice Sheet surface melt amplified by snowline migration and bare ice exposure, Science Advances, 5(3), doi:10.1126/sciadv.aav3738. Press release, Nature Research Highlight.
Cooley, S. C. Smith, L. C., Ryan, J. C., Pitcher, L H., and Pavelsky, T.: Arctic-Boreal lake dynamics revealed using CubeSat imagery, Geophysical Research Letters. doi:10.1029/2018GL081584. Press release.

2018

Jones, C., Ryan, J. C., Holt, T. and Hubbard, A.: Structural glaciology of Isunguata Sermia, West Greenland, Journal of Maps, 14(2), doi:10.1080/17445647.2018.1507952.
Ryan, J. C., Sessions, M., Wilson, R., Wündrich, O., and Hubbard, A. L.: Rapid surface lowering of Benito Glacier, Northern Patagonian Icefield, Frontiers in Earth Science, 6, doi.org/10.3389/feart.2018.00047. Press release.
Todd, J., Christoffersen, P., Zwinger, T., Raback, P., Chauche, N., Benn, D., Luckman, A., Ryan, J. C., Toberg, N., Slater, D., and Hubbard, A.: A Full-Stokes 3D Calving Model applied to a large Greenland Glacier. Journal of Geophysical Research: Earth Surface, doi:10.1002/2017JF004349.
Cooper, M. G., Smith, L. C., Rennermalm, A. K., Miege, C., Pitcher, L. H., Ryan, J. C., Yang, K. and Cooley, S. W.: Meltwater storage in low-density near-surface bare ice in the Greenland ice sheet ablation zone. The Cryosphere, 12, 955-970, doi:10.5194/tc-12-955-2018.
Ryan, J. C., Hubbard, A. L., Stibal, M., Irvine-Fynn, T. D., Cook, J. M., Cameron, K., and Box, J. E.: Dark zone of the Greenland Ice Sheet controlled by distributed biologically-active impurities, Nature Communications, 9, doi:10.1038/s41467-018-03353-2. Featured image on Nature Communication’s front page, press release.

2017

Smith, L. C., Yang, K., Pitcher, L. H., Overstreet, B. T., Chu, V. W., Rennermalm, A. K., Ryan, J. C., Cooper, M. G., Gleason, C. J., Tedesco, M., Jeyaratnam, J., van As, D., van den Broeke, M. R., van de Berg, W. J., Noël, B., Langen, P. L., Cullather, R. I., Zhao, B., Willis, M. J., Hubbard, A., Box, J. E., Jenner, B. A. and Behar, A. E.: Direct measurements of meltwater runoff on the Greenland Ice Sheet surface. PNAS, E10622–E10631, doi:10.1073/pnas.1707743114. New York Times feature.
Stibal, M., Box, J. E., Cameron, K. A., Langen, P. L., Yallop, M. L., Mottram, R. H., Khan, A. L., Molotch, N. P., Chrismas, N. A. M., Calì Quaglia, F., Remias, D., Smeets, C. J. P., van den Broeke, M. R., Ryan, J. C., Hubbard, A., Tranter, M., van As, D., and Ahlstrøm, A. P.: Algae drive enhanced darkening of bare ice on the Greenland ice sheet, Geophysical Research Letters, 44, doi:10.1002/2017GL075958.
Ryan, J. C., Hubbard, A. L., Irvine-Fynn, T. D., Doyle, S. H., Cook, J. M., Stibal, M., and Box, J. E.: How robust are in situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet?, Geophysical Research Letters, 44, doi:10.1002/2017GL073661. Editor’s research highlight.
Ryan, J. C., Hubbard, A. L., Box, J. E., Brough, S., Cameron, K., Cook, J. M., Cooper, M., Doyle, S. H., Edwards, A., Holt, T., Irvine-Fynn, T. D., Jones, C., Pitcher, L. H., Rennermalm, A. K., Smith, L. C., Stibal, M., and Snooke, N.: Derivation of high spatial resolution albedo from UAV digital imagery: Application over the Greenland Ice Sheet, Frontiers in Earth Science, 5(40), doi:10.3389/feart.2017.00040.

2016

Ryan, J.C., Dowdeswell, J. A., and Hogan, K. A.: Three cross-shelf troughs on the continental shelf of Southwest Greenland from Olex data, Atlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient, Geological Society, London, Memoirs, 46(1), 167-168.

2015

Ryan, J. C., Hubbard, A. L., Box, J. E., Todd, J., Christoffersen, P., Carr, J. R., Holt, T. O., and Snooke, N.: UAV photogrammetry and structure from motion to assess calving dynamics at Store Glacier, a large outlet draining the Greenland ice sheet, The Cryosphere, 9, 1-11, doi:10.5194/tc-9-1-2015.