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Heidi Dierssen
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Associate Professor of Marine Sciences/Geography at University of Connecticut
Recent PACE-related Publications | See All ►
A Physics-based Method for the Remote Sensing of Seagrasses (2016)
Spectral Reflectance of Palauan Reef-Building Coral with Different Symbionts in Response to Elevated Temperature (2016)
Space Station Image Captures a Red Tide Ciliate Bloom at High Spectral and Spatial Resolution (2015)
Hyperspectral Discrimination of Floating Mats of Seagrass Wrack and the Macroalgae Sargassum in Coastal Waters of Greater Florida Bay using Airborne Remote Sensing (2015)

Science Meeting Presentations (6)

Atmospheric Correction for Retrieval of Ocean Spectra from Space (ACROSS)
Chowdhary, J., Cairns, B., Zhai, P., Xu, F., Frouin, R., Stamnes, S., Cetinic, I., Liu, L., Twardowski, M., Hu, Y., Mischenko, M., Ottaviani, M., Remer, L., Boss, E., Lee, Z., Zhang, X., Dierssen, H., and Ibrahim, A. (16-Jan-18). Click here to view this presentation with audio.
Atmospheric Correction over Bright Water Targets with Non-negligible Radiances in the Near Infrared
Dierssen, H., Randolph, K., Garaba, S., Russell, B., and Bateman, T. (16-Jan-18). Click here to view this presentation with audio.
PACE Science Team: Atmospheric Correction over Bright Water Targets with Non-negligible Radiances in the Near Infrared
Dierssen, H., Randolph, K., Garaba, S., Zhai, P., and Gao, B-C. (17-Jan-17)
Improving Methods for Assessing Reflectance Due to Whitecaps and Foam from Ocean Color Imagery
Dierssen, H.M., Randolph, K.L., Garaba, S.P. (26-Feb-16). The standard ocean color atmospheric correction algorithms have a simplistic method for treating whitecaps and foam that relies upon wind speed. However, large variability exists in the relationship between wind speed and whitecap coverage, as well as the amount of reflectance associated with whitecap and foam features. Here, field measurements of the Lambertian Equivalent Reflectance (LER) of whitecaps and foam made from the visible into the short wave infrared (350-2500 nm) are presented.
Atmospheric Correction Over Bright Water Targets with Non-Negligible Radiances in the Near Infrared
Dierssen, H., Randolph, K., Garaba, S., Russell, B., and Bateman, T. (20-Jan-16)
Atmospheric Correction Over Bright Water Targets with Non-Negligible Radiances in the Near Infrared
Dierssen, H., Randolph, K., Russell, B., and Garaba., S. (14-Jan-15)

ROSES Proposal

Atmospheric Correction Over Bright Water Targets with Non-Negligible Radiances in the Near Infrared
Many scientists working with ocean color satellite imagery are required to conduct independent or partial atmospheric correction due to high backscattering in the Near Infrared (NIR). The standard atmospheric correction algorithms typically interpret the enhanced NIR from whitecaps, coccolithophores, cyanobacteria, floating vegetation, suspended sediments, and the benthos as enhanced scattering by aerosols. This creates both omission and commission errors such that the derived water-leaving reflectance and backscattering products are decreased and the aerosol products are increased in magnitude. If the PACE mission aims to derive climate quality aerosol concentrations and ocean biogeochemistry metrics, then better methods must be developed for dealing with water with non-negligible NIR and partitioning top of the atmosphere reflectance into the appropriate streams (aerosol, whitecap, glint). Having published on a variety of bright water targets over the last 15 years, I propose to be considered for the PACE Atmospheric Correction Science Team to bridge the gap between the atmospheric and water column approaches. I currently serve on the International Ocean Colour Coordinating Group and have served on a standing committee of the Space Studies Board, as well as several strategic working groups and satellite project teams. As part of this effort, I also propose to conduct targeted field measurements to provide better estimates of elevated reflectance due to whitecaps, foam and bubbles. Modeling enhanced reflectance due to whitecaps and bubbles requires a more complex treatment than a single windspeed parameterization, which cannot capture the orders of magnitude variability between the parameters. Here, we propose to conduct local measurements of the enhancement in reflectance due to whitecaps from the ultraviolet through the short wave infrared (SWIR). Coincident measurements of bubble entrainment will be conducted, as well as host of physical and bio-optical parameters. These data will be combined with available satellite imagery to evaluate partitioning whitecaps and bubbles from various atmospheric correction schemes. Correctly estimating whitecaps could also be an important climate relevant science parameter for those studying air-sea gas exchange, generation of sea spray aerosols and potentially applicable for estimating mixed layer depth for primary productivity models. Data collected in conjunction with this field effort, and other relevant project we and others have gathered on regions prone to elevated non-negligible NIR will be compiled in an archive of coincident satellite top of the atmosphere reflectance and high quality field measurements of water leaving reflectance. Such a database can be used to evaluate approaches across a variety of challenging bright water targets where common algorithms fail.

Publications (15)

Hedley, J., Russell, B., Randolph, K., and Dierssen, H. (2016). A Physics-based Method for the Remote Sensing of Seagrasses, Remote Sens. Environ., 174, 134-147, doi: 10.1016/j.rse.2015.12.001.
Russell, B.J., Dierssen, H.M., LaJeunesse, T.C., Hoadley, K.D., M.E. Warner, M.E., Kemp, D.W., and Bateman, T.G. (2016). Spectral Reflectance of Palauan Reef-Building Coral with Different Symbionts in Response to Elevated Temperature, Remote Sens., 8(3),164, doi: 10.3390/rs8030164.
Dierssen, H.M., McManus, G., Chlus, A., Qiu, D., Gao, B.-C., and Lin, S. (2015). Space Station Image Captures a Red Tide Ciliate Bloom at High Spectral and Spatial Resolution, Proc. National Acad. Sci., 112 (48), 14783-14787.
Dierssen, H.M., Chlus, A., and Russell, B. (2015). Hyperspectral Discrimination of Floating Mats of Seagrass Wrack and the Macroalgae Sargassum in Coastal Waters of Greater Florida Bay using Airborne Remote Sensing, Remote Sens. Environ., 167, 247-258, doi: 10.1016/j.rse.2015.01.027.
Russell, B. and Dierssen, H.M (2015). Use of Hyperspectral Imagery to Assess Cryptic Color Matching in Sargassum Associated Crabs, PLoS ONE, 10(9), e0136260, doi: 10.1371/journal. pone.0136260.
Dierssen, H.M. and Theberge, A.E. (2014). Bathymetry: Assessing Methods, Encyclopedia of Natural Resources, Taylor & Francis Group, New York.
Randolph, K., Dierssen, H.M., Twardowski, M., Cifuentes-Lorenzen, A., and Zappa, C.J. (2014). Optical Measurements of Small Deeply-penetrating Bubble Populations Generated by Breaking Waves in the Southern Ocean, J. Geophys. Res. Oceans, 119, doi:10.1002/2013JC009227.
Hovland, E.K., Dierssen, H.M., Ferreira, A.S., and Johnsen, G. (2013). Dynamics Regulating Major Trends in Barents Sea Temperatures and the Subsequent Effect on Remotely Sensed Particulate Inorganic Carbon, Marine Ecol. Progr. Ser., 484, 17-32, doi: 10.3354/meps10277.
Dierssen, H.M. and Randolph., K.L. (2013). Remote Sensing of Ocean Color, Encyclopedia of Sustainability Science and Technology (R.A. Meyers, ed.), Springer-Verlag, 8952-8975, doi: 978-1-4419-0851-3.
Dierssen, H.M. (2010). Perspectives on Empirical Approaches for Ocean Color Remote Sensing of Chlorophyll in a Changing Climate, Proc. Nat. Acad. Sci., 107, 17073-17078.
Aurin, D. A., Dierssen, H.M., Twardowski, M.S., and Roesler, C.S. (2010). Optical Complexity in Long Island Sound and Implications for Coastal Ocean Color Remote Sensing, J. Geophys. Res., 115, C07011, doi: 10.1029/2009JC005837.
Dierssen, H.M. , Kudela, R.M., Ryan, J.P., and Zimmerman, R.C. (2006). Red and Black Tides: Quantitative Analysis of Water-leaving Radiance and Perceived Color for Phytoplankton, Colored Dissolved Organic Matter, and Suspended Sediments, Limnol. Oceanogr., 51(6), 2646-2659, doi: 10.4319/lo.2006.51.6.2646.
Seibel, B.A., and Dierssen., H.M. (2003). Tip of the Iceberg: Cascading Trophic Impacts of B-15A in the Ross Sea, Antarctica, Biol. Bull., 205(2), 93-97.
Dierssen, H.M., Smith, R.C., and Vernet, M. (2002). Glacial Meltwater Dynamics in Coastal Waters West of the Antarctic Peninsula, Proc. Nat. Acad. Sci., 99(4), 1790-1795.
Smith, R.C., Baker, K.S., Dierssen, H.M, Stammerjohn, S.E., and Vernet, M. (2001). Variability of Primary Production in an Antarctic Marine Ecosystem as Estimated Using a Multi-scale Sampling Strategy, Amer. Zool., 41, 40-56, doi: 10.1668/0003-1569(2001)041[0040:VOPPIA]2.0.CO;2.