Ocean lidar measurements of beam attenuation and a roadmap to accurate phytoplankton biomass estimates
| Autor: | Mark A. Vaughan, Carolus C. Verhappen, Ray D. Rhew, Damien Josset, Carolyn F. Butler, Ali Omar, Sharon Rodier, Peng-Wang Zhai, Chris A. Hostetler, David G. MacDonnell, Bill Hunt, Michael J. Behrenfeld, Jacques Pelon, Anne Lifermann, Ivona Cetinić, Charles R. Trepte, Wayne H. Slade, Johnathan W. Hair, Xiaomei Lu, Weilin Hou, Carl Weimer, David M. Winker, Yongxiang Hu, Zhaoyan Liu |
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| Přispěvatelé: | NASA Langley Research Center [Hampton] (LaRC), Oregon State University (OSU), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Sequoia Scientific Inc., University of Maine, University of Maryland [Baltimore County] (UMBC), University of Maryland System, Ball Aerospace and Technologies Corp., National Institute of Aerospace [Hampton] (NIA), Naval Research Laboratory (NRL), Centre National d'Etudes Spatiales (CNES) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
010504 meteorology & atmospheric sciences Backscatter Scattering Attenuation Physics QC1-999 01 natural sciences 010309 optics Lidar [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems 13. Climate action Brillouin scattering Ocean color 0103 physical sciences Depolarization ratio Satellite 14. Life underwater Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | EPJ Web of Conferences EPJ Web of Conferences, EDP Sciences, 2016, The 27th International Laser Radar Conference (ILRC 27), 119, pp.22003. ⟨10.1051/epjconf/201611922003⟩ EPJ Web of Conferences, Vol 119, p 22003 (2016) EPJ Web of Conferences, 2016, The 27th International Laser Radar Conference (ILRC 27), 119, pp.22003. ⟨10.1051/epjconf/201611922003⟩ |
| ISSN: | 2100-014X |
| DOI: | 10.1051/epjconf/201611922003⟩ |
| Popis: | International audience; Beam 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 30° 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. |
| Databáze: | OpenAIRE |
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