Sinéad Louise Farrell joined the Department of Geographical Sciences as an associate professor in the fall of 2019. Dr. Farrell has a joint appointment with the Department of Atmospheric and Oceanic Science. Dr. Farrell received her Ph.D. in Space and Climate Physics from University College London in 2007. Her primary fields of study are cryospheric sciences and remote sensing. She is a principal investigator on the NASA ICESat-2 Science Team and a member of the Mission Advisory Group for the Copernicus Polar Ice and Snow Topography Altimeter. Prior to joining the Department of Geographical Sciences, Dr. Farrell was an Associate Research Scientist at the Earth System Science Interdisciplinary Center (ESSIC), at the University of Maryland. She is also a visiting scientist with the NOAA Laboratory for Satellite Altimetry, College Park, MD.

Areas of Interest

  • Remote sensing
  • Polar oceans and sea ice
  • Laser and Radar Altimetry, SAR
  • Climate monitoring
  • Earth System Science
CV: CV for FARRELL 110.22 KB

Degrees

  • Degree Type
    PhD
    Degree Details
    University College London
  • Degree Type
    MSci
    Degree Details
    University College London
Teaching Philosophy
Fall 2021
AOSC440/GEOG440: Polar Remote Sensing
https://app.testudo.umd.edu/soc/202108/AOSC/AOSC440/0.pdf
The harsh environment of the vast polar regions makes them some of the most inaccessible places on Earth. With widespread environmental change already underway, satellite remote sensing provides the only means by which to obtain year-round observations of the polar climate system. The objective of this course is to provide students with an overview of polar remote sensing techniques, including the physical principles of active and passive sensors, orbits, electromagnetic radiation, atmospheric transmission, calibration and validation. We will focus on measurements of the polar oceans, sea ice, glaciers, ice sheets, snow and permafrost, and examine the response of the cryosphere to climate change.

Spring 2020 and 2021
GEOG301: Advanced Geographical Environmental Systems
https://app.testudo.umd.edu/soc/202101/GEOG/GEOG301/0.pdf
GEOG301 is organized around eight major topics:
(1) Global Energy Balance and the Greenhouse Effect
(2) Atmospheric Circulation
(3) Oceanic circulation
(4) The Geosphere
(5) The Biosphere
(6) The Cryosphere
(7) Climate Change: past, present and future
(8) Monitoring and Modeling Earth Systems
Philosophy Upload
Course Name Course Title Semester Syllabus
GEOG301 Advanced Geographical Environmental Systems Spring 2020 Syllabus

Peer-Reviewed Publications

  1. Rösel, A., Farrell, S. L., Nandan, V., Richter-Menge, J., Spreen, G., Divine, D. V., Gallet, J.-C., and Gerland, S. (2021). Implications of surface flooding on airborne thickness measurements of snow on sea ice, The Cryosphere Discuss., https://doi.org/10.5194/tc-2020-168, accepted.
  2. International Altimetry Team (2021). Altimetry for the future: Building on 25 years of progress. Advances in Space Research, in press.
  3. Perovich, D., W. Meier, M. Tschudi, S. Hendricks, A. A. Petty, D. Divine, S. Farrell, S. Gerland, C. Haas, L. Kaleschke, O. Pavlova, R. Ricker, X. Tian-Kunze, M. Webster, and K. Wood (2020). Sea Ice. Arctic Report Card 2020, R. L. Thoman, J. Richter-Menge, and M. L. Druckenmiller, Eds., https://arctic.noaa.gov/Report-Card/Report-Card-2020  https://doi.org/10.25923/vtdn-2198
  4. Farrell, S. L., Duncan, K., Buckley, E. M., Richter‐Menge, J., & Li, R. (2020). Mapping Sea Ice Surface Topography in High Fidelity with ICESat‐2. Geophysical Research Letters, 47, e2020GL090708. https://doi.org/10.1029/2020GL090708 
  5. Andersen, J. K., Andreassen, L. M., Baker, E. H., Ballinger, T. J., Berner, L. T., Bernhard, G. H., Bhatt, U. S., Bjerke, J. W., Box, J. E., Britt, L., Brown, R., Burgess, D., Cappelen, J., Christiansen, H. H., Decharme, B., Derksen, C., Drozdov, D. S., Epstein, H. E., Farquharson, L. M., Farrell, S. L., Fausto, R. S., Fettweis, X., Fioletov, V. E., Forbes, B. C., Frost, G. V., Gerland, S., Goetz, S. J., Grooß, J., Hanna, E., Hanssen-Bauer, I., Hendricks, S., Ialongo, I., Isaksen, K., Johnsen, B., Kaleschke, L., Kholodov, A. L., Kim, S., Kohler, J., Labe, Z., Ladd, C., Lakkala, K., Lara, M. J., Loomis, B., Luks, B., Luojus, K., Macander, M. J., Malkova, G. V., Mankoff, K. D., Manney, G. L., Marsh, J. M., Meier, W., Moon, T. A., Mote, T., Mudryk, L., Mueter, F. J., Müller, R., Nyland, K. E., O’Neel, S., Overland, J. E., Perovich, D., Phoenix, G. K., Raynolds, M. K., Reijmer, C. H., Ricker, R., Romanovsky, V. E., Schuur, E. A. G., Sharp, M., Shiklomanov, N. I., Smeets, C. J. P. P., Smith, S. L., Streletskiy, D. A., Tedesco, M., Thoman, R. L., Thorson, J. T., Tian-Kunze, X., Timmermans, M., Tømmervik, H., Tschudi, M., van As, D., van de Wal, R. S. W., Walker, D. A., Walsh, J. E., Wang, M., Webster, M., Winton, Ø., Wolken, G. J., Wood, K., Wouters, B., & Zador, S. (2020). The Arctic, Bulletin of the American Meteorological Society, 101(8), S239-S286. https://doi.org/10.1175/BAMS-D-20-0086.1
  6. Duncan, K., S. L. Farrell, J. Hutchings, J. Richter-Menge (2020). Late Winter Observations of Sea Ice Pressure Ridge Sail Height. IEEE Geoscience and Remote Sensing Letters, https://doi.org/10.1109/LGRS.2020.3004724
  7. Kern, M., R. Cullen, B. Berruti, J. Bouffard, T. Casal, M. R. Drinkwater, A. Gabriele, A. Lecuyot, M. Ludwig, R. Midthassel, I. Navas Traver, T. Parrinello, G. Ressler, E. Andersson, C. Martin Puig, O. Andersen, A. Bartsch, S. L. Farrell, S. Fleury, S. Gascoin, A. Guillot, A. Humbert, E. Rinne, A. Shepherd, M. R. van den Broeke, J. Yackel, (2020), The Copernicus Polar Ice and Snow Topography Altimeter (CRISTAL) high-priority candidate mission, The Cryosphere, 14, 2235–2251, https://doi.org/10.5194/tc-14-2235-2020.
  8. Buckley, E. M., Farrell, S. L., Duncan, K., Connor, L. N., Kuhn, J. M., & Dominguez, R. T. (2020). Classification of sea ice summer melt features in high‐resolution IceBridge imagery. J. Geophys. Res., 125, e2019JC015738. https://doi.org/10.1029/2019JC015738
  9. Perovich, D., W. Meier, M. Tschudi, S. Farrell, S. Hendricks, S. Gerland, L. Kaleschke, R. Ricker, X. Tian-Kunze, M. Webster and K. Wood (2019b), Sea ice, Arctic Report Card 2019, peer-reviewed, https://arctic.noaa.gov/Report-Card/Report-Card-2019  
  10. Magruder, L., T. Neumann, H. Fricker, S. L. Farrell, K. Brunt, A. Gardner, D. Hancock, K. Harbeck, M. Jasinski, R. Kwok, N. Kurtz, J. Lee, T. Markus, J. Morison, A. Neuenschwander, S. Palm, S. Popescu, B. Smith and Y. Yang (2019), New Earth orbiter provides a sharper look at a changing planet, EOS, 100, https://doi.org/10.1029/2019EO133233.
  11. Perovich, D., W. Meier, M. Tschudi, S. Farrell, S. Hendricks, S. Gerland, C. Haas, T. Krumpen, C. Polashenski, R. Ricker and M. Webster (2019a), Sea ice cover [in “State of the Climate in 2018”], Bull. Amer. Meteor. Soc., 100(9), S146–150, https://doi.org/10.1175/2019BAMSStateoftheClimate.1   
  12. Kwok, R., Markus, T., Kurtz, N. T., Petty, A. A., Neumann, T. A., Farrell, S. L., Cunningham, G. F., Hancock, D. W., Ivanoff, A., Wimert, J. (2019), Surface height and sea ice freeboard of the Arctic Ocean from ICESat‐2: Characteristics and early results, J. Geophys. Res., 124. https://doi.org/10.1029/2019JC015486
  13. Sallila, H., S.L. Farrell, J. McCurry, and E. Rinne (2019). Assessment of Contemporary Satellite Sea Ice Thickness Products for Arctic Sea Ice. The Cryosphere, 13, 1187-1213, 2019
    https://doi.org/10.5194/tc-13-1187-2019
  14. Perovich, D. K., W. Meier, M. Tschudi, S. Farrell, S. Hendricks, S. Gerland, C. Haas, T. Krumpen, C. Polashenski, R. Ricker, M. Webster (2018b), Sea ice, Arctic Report Card 2018, peer-reviewed, https://arctic.noaa.gov/Report-Card/Report-Card-2018
  15. Rostosky, P., Spreen, G., Farrell, S. L., Frost, T., Heygster, G., & Melsheimer, C. (2018). Snow depth retrieval on Arctic sea ice from passive microwave radiometers - Improvements and extensions to multiyear ice using lower frequencies. J. Geophys. Res., 123, 7120–7138. https://doi.org/10.1029/2018JC014028
  16. Perovich, D. K., W. Meier, M. Tschudi, S. Farrell, S. Hendricks, S. Gerland, C. Haas, T. Krumpen, C. Polashenski, R. Ricker and M. Webster (2018a), Sea ice cover [in “State of the Climate in 2017”], Bull. Amer. Meteor. Soc., 99(8), S147–152, https://doi.org/10.1175/2018BAMSStateoftheClimate.1    
  17. Shepherd, A., H. A. Fricker, S. L. Farrell (2018), Trends and Connections Across the Antarctic Cryosphere, Nature, 558, 223-232, https://doi.org/10.1038/s41586-018-0171-6
  18. Blanchard-Wrigglesworth, E., M. A. Webster, S. L. Farrell and C. M. Bitz (2018), Reconstruction of Snow on Arctic Sea Ice, J. Geophys. Res., https://doi.org/10.1002/2017JC013364
  19. Allard, R. A., S. L. Farrell, D. A. Hebert, W. F. Johnston, L. Li, N. T. Kurtz, M. W. Phelps, P. G. Posey, R. Tilling, A. Ridout, A. J. Wallcraft (2018), Utilizing CryoSat-2 Ice Thickness to Initialize a Coupled Ice-Ocean Modeling System, Advances in Space Res., https://doi.org/10.1016/j.asr.2017.12.030   
  20. Duncan, K., S. L. Farrell, L. N. Connor, J. Richter-Menge and R. Dominguez (2018), High-Resolution Airborne Observations of Sea Ice Pressure-Ridge Sail Height, Annals of Glaciology, https://doi.org/10.1017/aog.2018.2
  21. Perovich, D. K., W. Meier, M. Tschudi, S. Farrell, S. Hendricks, S. Gerland, C. Haas, T. Krumpen, C. Polashenski, R. Ricker, M. Webster (2017), Sea ice, Arctic Report Card 2017, peer-reviewed, http://www.arctic.noaa.gov/Report-Card/Report-Card-2017/ArtMID/7798/ArticleID/699/Sea-Ice
  22. Skourup, H., S. L. Farrell, S. Hendricks, R. Ricker, T. W. K. Armitage, A. Ridout, O. B. Andersen, C. Haas and S. Baker (2017), An Assessment of State-of-the-Art Mean Sea Surface and Geoid Models of the Arctic Ocean: Implications for Sea Ice Freeboard Retrieval, J. Geophys. Res.: Oceans, 122, https://doi.org/10.1002/2017JC013176
  23. Kwok, R., N. T. Kurtz, L. Brucker, A. Ivanoff, T. Newman, S. L. Farrell, J. King, S. Howell, M. A. Webster, J. Paden, C. Leuschen, J. A. MacGregor, J. Richter-Menge, J. Harbeck and M. Tschudi (2017), Intercomparison of snow depth retrievals over Arctic sea ice from radar data acquired by Operation IceBridge, The Cryosphere, 11, 2571-2593, https://doi.org/10.5194/tc-11-2571-2017
  24. Cole, S. T., J. M. Toole, R. Lele, M.-L. Timmermans, S. G. Gallaher, T. P. Stanton, W. J. Shaw, B. Hwang, T. Maksym, J. P. Wilkinson, M. Ortiz, H. Graber, L. Rainville, A. A. Petty, S. L. Farrell, J. A. Richter-Menge and C. Haas (2017), Ice and ocean velocity in the Arctic marginal ice zone: Ice roughness and momentum transfer, Elementa Sci. Anth., 5(55), http://doi.org/10.1525/elementa.241
  25. Perovich, D., W. Meier, M. Tschudi, S. Farrell, S. Gerland, S. Hendricks, T. Krumpen and C. Haas (2017), Sea ice cover [in “State of the Climate in 2016”], Bull. Amer. Meteor. Soc., 98(8), S131–S133
  26. Yan, J.-B., S. Gogineni, F. Rodriguez-Morales, D. Gomez-Garcia, J. Paden, J. Li, C. Leuschen, D. Braaten, J. Richter-Menge, S. Farrell, J. Brozena and R. Hale (2017), Airborne Measurements of Snow Thickness: Using ultrawide-band frequency-modulated-continuous-wave radars, IEEE Geosci. Rem. Sens. Mag., 5(2), pp. 57-76, https://doi.org/10.1109/MGRS.2017.2663325    
  27. Markus, T., T. Neumann, A. Martino, W. Abdalati, K. Brunt, B. Csatho, S. Farrell, H. Fricker, A. Gardner, D. Harding, M. Jasinski, R. Kwok, L. Magruder, D. Lubin, S. Luthcke, J. Morison, R. Nelson, A. Neuenschwander, S. Palm, S. Popescu, CK Shum, B. E. Schutz, B. Smith, Y. Yang and J. Zwally (2017), The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2): Science requirements, concept, and implementation, Rem. Sens. Environ., 190, 260-273, https://doi.org/10.1016/j.rse.2016.12.029   
  28. Perovich, D. K., W. Meier, M. Tschudi, S. Farrell, S. Gerland, S. Hendricks, T. Krumpen and C. Haas (2016), Sea ice, Arctic Report Card 2016, peer-reviewed (http://arctic.noaa.gov/Report-Card/Report-Card-2016/ArtMID/5022/ArticleID/286/Sea-Ice).
  29. Perovich, D., W. Meier, M. Tschudi, S. Farrell, S. Gerland and S. Hendricks (2016), Sea ice cover [in “State of the Climate in 2015”], Bull. Amer. Meteor. Soc., 97(8), S134–S135
  30. Petty, A., M. Tsamados, N. Kurtz, S. Farrell, T. Newman, J. Harbeck, D. Feltham and J. Richter-Menge (2016), Characterizing Arctic sea ice topography using high-resolution IceBridge data, The Cryosphere, 10(3), 1161
  31. Perovich, D. K., W. Meier, M. Tschudi, S. Farrell, S. Gerland and S. Hendricks (2015), Sea ice, Arctic Report Card 2015, peer-reviewed, http://arctic.noaa.gov/Report-Card/Report-Card-2015/ArtMID/5037/ArticleID/217/Sea-Ice
  32. Blanchard-Wrigglesworth, E., S. L. Farrell, T. Newman and C. M. Bitz (2015), Snow cover on Arctic sea ice in observations and an Earth System Model, Geophys. Res. Lett., https://doi.org/10.1002/2015GL066049
  33. Farrell, S. L., K. M. Brunt, J. M. Ruth, J. M. Kuhn, L. N. Connor and K. M. Walsh (2015), Sea Ice Freeboard Retrieval using Digital Photon-counting Laser Altimetry, Ann. Glaciol., 56(69), 167–174, https://doi.org/10.3189/2015AoG69A686
  34. Newman T., S. L. Farrell, J. Richter-Menge, B. Elder, L. Connor, N. Kurtz and D. McAdoo (2014), Assessment of Radar-derived Snow Depth Measurements over Arctic sea ice, J. Geophys. Res., 119, 8578–8602, https://doi.org/10.1002/2014JC010284
  35. Webster, M. A., I. G. Rigor, S. V. Nghiem, N. T. Kurtz, S. L. Farrell, D. K. Perovich and M. Sturm (2014), Interdecadal Changes in Snow Depth on Arctic Sea Ice, J. Geophys Res., 119, https://doi.org/10.1002/2014JC009985
  36. Tsamados, M., D. Feltham, D. Schroeder, D. Flocco, S. Farrell, N. Kurtz, S. Laxon, and S. Bacon (2014), Impact of atmospheric and oceanic form drag on simulations of Arctic sea ice, J. Phys. Oceanog., 44, 1329-1353, https://doi.org/10.1175/JPO-D-13-0215.1
  37. Richter-Menge, J., and S. L. Farrell (2013), Arctic Sea Ice Conditions in Spring 2009 - 2013 Prior to Melt, Geophys. Res. Lett., 40, 5888-5893, https://doi.org/10.1002/2013GL058011
  38. Kurtz, N., S. L. Farrell, M. Studinger, N. Galin, J. Harbeck, R. Lindsay, V. Onana, B. Panzer, and J. Sonntag (2013), Sea ice thickness, freeboard, and snow depth products from Operation IceBridge airborne data, The Cryosphere,7,1035-1056, https://doi.org/10.5194/tc-7-1035-2013
  39. Connor, L. C., S. L. Farrell, D. C. McAdoo, W. B. Krabill, and S. Manizade (2013), Validating ICESat over thick sea ice in the northern Canada Basin, IEEE Transactions on Geoscience & Remote Sensing, 51(4), 2188-2200, https://doi.org/10.1109/TGRS.2012.2211603
  40. Laxon, S.W., Giles, K. A., Ridout, A. L., Wingham, D. J., Willatt, R., Cullen, R., Kwok, R., Schweiger, A., Zhang, J., Haas, C., Hendricks, S., Krishfield, R., Kurtz, N., Farrell, S. L., Davidson, M. (2013), CryoSat Estimates of Arctic Sea Ice Volume, Geophys. Res. Lett., 40(4), 732-737, https://doi.org/10.1002/grl.50193  
  41. McAdoo, D. C., S. L Farrell, S. W. Laxon, A. L. Ridout, H. J Zwally & D. Yi (2013), Gravity of the Arctic Ocean from satellite data with validations using airborne gravimetry: oceanographic implications,J. Geophys. Res.,118,917–930, https://doi.org/10.1002/jgrc.20080
  42. Kurtz, N., M. Studinger, S. Farrell, J. Paden, J. Richter-Menge, J. Sonntag, and J. Yungel (2013), IceBridge Airborne Survey Data Support Arctic Sea Ice Predictions, EOS Trans. AGU, 94(4), 41, https://doi.org/10.1002/2013EO040001
  43. Onana, V. D. P., N. T. Kurtz, S. Farrell, L. S. Koenig, M. Studinger, and J. P. Harbeck (2013), A Sea Ice Lead Detection Algorithm for use with High Resolution Airborne Visible Imagery, IEEE Trans. Geosci. & Rem. Sens.,51(1),38-56, https://doi.org/10.1109/TGRS.2012.2202666
  44. Farrell, S. L., N. Kurtz, L. N. Connor, B. C. Elder, C. Leuschen, T. Markus, D. C. McAdoo, B. Panzer, J. Richter-Menge, and J. G. Sonntag (2012b), A First Assessment of IceBridge Snow and Ice Thickness Data Over Arctic Sea Ice, IEEE Trans. Geosci. & Rem. Sens., 50(6), 2098 - 2111, https://doi.org/10.1109/TGRS.2011.2170843
  45. Gardner, J., J. Richter-Menge, S. Farrell, and J. M. Brozena (2012), Coincident multiscale estimates of Arctic sea ice thickness, EOS Trans. AGU, 93(6), 57, https://doi.org/10.1029/2012EO060001
  46. Farrell, S. L., D. C. McAdoo, S. W. Laxon, H. J. Zwally, D. Yi, A. Ridout, and K. Giles (2012a), Mean Dynamic Topography of the Arctic Ocean, Geophys. Res. Lett., 39, L01601, https://doi.org/10.1029/2011GL050052
  47. Kurtz, N. T. and S. L. Farrell (2011), Large-scale surveys of snow depth on Arctic sea ice from Operation IceBridge, Geophys. Res. Lett., 38, L20505, https://doi.org/10.1029/2011GL049216
  48. Kurtz, N. T., T. Markus, S. L. Farrell, D. L. Worthen, and L. N. Boisvert (2011), Observations of recent Arctic sea ice volume loss and its impact on ocean-atmosphere energy exchange and ice production, J. Geophys. Res., 116, C04015, https://doi.org/10.1029/2010JC006235
  49. Farrell, S. L., T. Markus, R. Kwok, L. Connor (2011), Laser Altimetry Sampling Strategies over Sea Ice, Annals Glaciol., 52(57), 69-76, https://doi.org/10.3189/172756411795931660
  50. Abdalati, W., H. J. Zwally, R. Bindschadler, B. Csatho, S. L. Farrell, H. A. Fricker, D. Harding, R. Kwok, M. Lefsky, T. Markus, A. Marshak, T. Neumann, S. Palm, B. Schutz, B. Smith, J. Spinhirne, C. Webb (2010), The ICESat-2 Laser Altimetry Mission, Proc. IEEE, 98(5), 735 – 751, https://doi.org/10.1109/JPROC.2009.2034765
  51. Kwok, R., S. Farrell, R. Forsberg, K. Giles, S. Laxon, D. McAdoo, J. Morison, L. Padman, C. Peralta-Ferriz, A. Proshutinsky, and M. Steele (2010), Combining satellite altimetry, time-variable gravity, and bottom pressure observations to understand the Arctic Ocean: A transformative opportunity, in Proc. OceanObs09: Sustained Ocean Observations and Information for Society (Vol. 2), Hall, J., D. E. Harrison and D. Stammer (eds.), Venice, Italy, 21-25 September 2009, ESA Publication WPP-306, peer-reviewed.
  52. Farrell, S. L., S. W. Laxon, D. C. McAdoo, D. Yi, and H. J. Zwally (2009), Five years of Arctic sea ice freeboard measurements from the Ice, Cloud and land elevation Satellite, J. Geophys. Res., 114, C04008, https://doi.org/10.1029/2008JC005074
  53. McAdoo, D. C., S. L. Farrell, S. W. Laxon, H. J. Zwally, D. Yi, and A. L. Ridout (2008), Arctic Ocean Gravity Field Derived from ICESat and ERS-2 Altimetry: Tectonic Implications, J. Geophys. Res., 113, B05408, https://doi.org/10.1029/2007JB005217
  54. Farrell, S. L. (2007), Satellite Laser Altimetry Over Sea Ice, Ph.D. doctoral thesis, 224 pp., Univ. College London, London, U. K., peer-reviewed, http://discovery.ucl.ac.uk/1445477/

 

  • National
    NASA ICESat-2 Science Team
  • National
    NOAA/NASA Ocean Surface Topogrpahy Science Team
  • International
    Copernicus Polar Ice and Snow Topography Altimeter (CRISTAL) Mission Advisory Group

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