Ocean subsurface studies from space-based lidar measurements Xiaomei Lu, 1 Yongxiang Hu, 2 1 Science Systems and Applications, Inc. (SSAI), Hampton, Virginia.

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Ocean subsurface studies from space-based lidar measurements Xiaomei Lu, 1 Yongxiang Hu, 2 1 Science Systems and Applications, Inc. (SSAI), Hampton, Virginia 23666, USA 2 Atmospheric Composition Branch, NASA Langley research Center, Hampton, VA, 23681, USA

Outline Space-based and Ground-based Lidar Overview of CALIPSO mission Ocean Subsurface results from space-based lidar Particulate Organic Carbon (POC) Results

Afternoon Constellation Evolution A-train

Ground-based lidar-EARLINET European Aerosol Research LIdar NETwork Earlinet Network 25 stations Naples station (40.833°N, °E, 118 m. asl)

Combing the ground-based and space-based lidar measurements Reference ： Xiaomei. Lu, Yuesong. Jiang, Xueguo. Zhang "An Algorithm to retrieve aerosol properties from analysis of multiple scattering influences on both Ground-Based and Space-Borne Lidar Returns," Opt. Express 17, (2009)

CALIPSO Mission Overview CALIPSO: lidar measurements of aerosol and clouds Launched: April 28, 2006 Operational Achievements: Long term measurements: CALIPSO collected more than 9 years of measurements so far; Observations during day/night and for all seasons Data publicly available CALIPSO Adds the Vertical Dimension

Lidar station of CALIPSO

30 degree off-nadir measurement for ocean subsurface studies July 17 Night Why pointing CALIPSO 30 degree off-nadir: avoid ocean surface backscatter 1.Direct demonstration of CALIPSO ocean subsurface signals in both co- polarization and cross-polarization to convince the community that CALIOP can measure phytoplankton backscatter 2.Direct measurements of depolarization ratios of phytoplankton backscatter to improve CALIOP estimate of phytoplankton backscatter and biomass estimate Behrenfeld, Hu, Hostetler, Dall'Olmo, Rodier, Hair, Trepte(2013), Space-based lidar measurements of global ocean carbon stocks, Geophys. Res. Lett., 40, 4355–4360, doi: /grl Lu., Hu, Trepte, Zeng, and Churnside (2014), Ocean subsurface studies with the CALIPSO spaceborne lidar, J. Geophys. Res. Oceans, 119, 4305–4317, doi: /2014JC

subsurface Subsurface signal 532nm Total 532nm Cross Polarization 1064nm Total

subsurface 532nm Toal 532nm Cross Polarization 1064nm Total

Surface signals are much weaker than subsurface signals and can be corrected using 1064nm measurements Red: subsurface signal in cross polarization Magenta: surface signal in cross polarization Blue: surface and subsurface in 532nm co-polarization Black and Green: surface signal in co-polarization

Ocean Subsurface results Results from MODIS Results from CALIPSO

Applications: Improving Phytoplankton Particulate Organic Carbon (POC) Estimate from CALIPSO Particulate Organic Carbon (mg m -3 ) from CALIPSO The 30 degree off-nadir measurement verifies the assumption about depolarization ratio Behrenfeld, Hu, Hostetler, Dall'Olmo, Rodier, Hair, Trepte, GRL, 2013

AGU’s EOS Research Spotlight on CALIPSO Ocean subsurface measurements 27 May 2015 Hacking a Climate Satellite to See Beneath the Ocean's Surface When NASA launched its CALIPSO spacecraft, the space agency did not intend to estimate phytoplankton populations. Earth & Space Science Newsrth & Space Science News References 1.Behrenfeld, M. J., Y. Hu, C. A. Hostetler, G. Dall'Olmo, S. D. Rodier, J. W. Hair, and C. R. Trepte (2013), Space-based lidar measurements of global ocean carbon stocks, Geophys. Res. Lett., 40, 4355–4360, doi: /grl Xiaomei Lu, Yongxiang Hu, Charles Trepte, Shan Zeng, James H. Churnside, Ocean subsurface studies with the CALIPSO spaceborne lidar, Journal of Geophysical Research: Oceans, 2014, 119, 7, 4305.

Conclusion 1.CALIPSO satellite is tilted for one night-time orbit in July in order to measure phytoplankton backscatter at 30-degree off-nadir accurately 2.Subsurface signals are clearly seen in both polarization channels of 532 nm (green) CALIOP measurements, where surface signals are one (co-polarization) and two (cross-polarization) orders of magnitudes weaker than subsurface signals. 3.Depolarization ratios of phytoplankton backscatter are measured from space for the first time. 4.The operation helps reduce uncertainty in global carbon biomass assessment using CALIPSO ocean subsurface optical measurements.