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An Innovative Concept for Spacebased Lidar Measurement of Ocean Carbon BiomassBeam attenuation coefficient, c, provides an important optical index of plankton standing stocks, such as phytoplankton biomass and total particulate carbon concentration. Unfortunately, c has proven difficult to quantify through remote sensing. Here, we introduce an innovative approach for estimating c using lidar depolarization measurements and diffuse attenuation coefficients from ocean color products or lidar measurements of Brillouin scattering. The new approach is based on a theoretical formula established from Monte Carlo simulations that links the depolarization ratio of sea water to the ratio of diffuse attenuation Kd and beam attenuation C (i.e., a multiple scattering factor). On July 17, 2014, the CALIPSO satellite was tilted 30Âdeg off-nadir for one nighttime orbit in order to minimize ocean surface backscatter and demonstrate the lidar ocean subsurface measurement concept from space. Depolarization ratios of ocean subsurface backscatter are measured accurately. Beam attenuation coefficients computed from the depolarization ratio measurements compare well with empirical estimates from ocean color measurements. We further verify the beam attenuation coefficient retrievals using aircraft-based high spectral resolution lidar (HSRL) data that are collocated with in-water optical measurements.
Document ID
20160006508
Acquisition Source
Langley Research Center
Document Type
Presentation
Authors
Hu, Yongxiang (NASA Langley Research Center Hampton, VA, United States)
Behrenfeld, Michael (Oregon State Univ. Corvallis, OR, United States)
Hostetler, Chris (NASA Langley Research Center Hampton, VA, United States)
Pelon, Jacques (Centre National d'Etudes Spatiales Paris, France)
Trepte, Charles (NASA Langley Research Center Hampton, VA, United States)
Hair, John (NASA Langley Research Center Hampton, VA, United States)
Slade, Wayne (Sequoia Scientific, Inc. Bellevue, WA, United States)
Cetinic, Ivona (Maine Univ. Walpole, ME, United States)
Vaughan, Mark (NASA Langley Research Center Hampton, VA, United States)
Lu, Xiaomei (NASA Langley Research Center Hampton, VA, United States)
Zhai, Pengwang (Maryland Univ. Baltimore County Baltimore, MD, United States)
Weimer, Carl (Ball Aerospace and Technologies Corp. Boulder, CO, United States)
Winker, David (NASA Langley Research Center Hampton, VA, United States)
Verhappen, Carolus C. (NASA Langley Research Center Hampton, VA, United States)
Butler, Carolyn (NASA Langley Research Center Hampton, VA, United States)
Liu, Zhaoyan (NASA Langley Research Center Hampton, VA, United States)
Hunt, Bill (NASA Langley Research Center Hampton, VA, United States)
Omar, Ali (NASA Langley Research Center Hampton, VA, United States)
Rodier, Sharon (NASA Langley Research Center Hampton, VA, United States)
Lifermann, Anne (Oregon State Univ. Corvallis, OR, United States)
Josset, Damien (Naval Research Lab. Stennis Space Center, MS, United States)
Hou, Weilin (Naval Research Lab. Stennis Space Center, MS, United States)
MacDonnell, David (NASA Langley Research Center Hampton, VA, United States)
Rhew, Ray (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
May 23, 2016
Publication Date
July 5, 2015
Subject Category
Oceanography
Report/Patent Number
NF1676L-21414
Meeting Information
Meeting: International Laser Radar Conference
Location: New York, NY
Country: United States
Start Date: July 5, 2015
End Date: July 10, 2015
Sponsors: City Coll. of the City Univ. of New York, National Oceanic and Atmospheric Administration, NASA Headquarters
Funding Number(s)
WBS: WBS 653967.04.12.01
Distribution Limits
Public
Copyright
Public Use Permitted.

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