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Institut für Umweltphysik (IUP) Institut für Fernerkundung (IFE)

CarbonSat L1L2 Study Final Presentation , 3-Jul-2013 . Universität Bremen, FB1 Physik und Elektrotechnik. Institut für Umweltphysik (IUP) Institut für Fernerkundung (IFE). Performance w.r.t. secondary products: Vegetation Chlorophyll Fluorescence (VCF)

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Institut für Umweltphysik (IUP) Institut für Fernerkundung (IFE)

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  1. CarbonSat L1L2 Study Final Presentation, 3-Jul-2013 Universität Bremen, FB1 Physik und Elektrotechnik Institut für Umweltphysik (IUP) Institut für Fernerkundung (IFE) • Performance w.r.t. secondary products: • Vegetation Chlorophyll Fluorescence (VCF) • ESA Study CarbonSat Earth Explorer 8 Candidate Mission • “Level-2 and Level-1B Requirements Consolidation Study“ • ESA Contract No4000105676/12/NL/AF M. Buchwitz, V. Rozanov, H. Bovensmann Institute of Environmental Physics (IUP) / Institute of Remote Sensing (IFE), University of Bremen (UB), Bremen, Germany 1

  2. Whydo wehavetoconsider VCF forCarbonSat ? As shown in Frankenberg et al., AMT, 2012, neglecting VCF canresult in XCO2biasesof ~1 ppm. This iscritical, asthesebiaseswouldbespatio-temporallycorrelatedwiththe XCO2source/sink patternfrom CO2uptakeandreleaseofvegetation. Frankenberg et al., AMT, 2012 2

  3. SimulatedCarbonSatSpectra & VCF signal • Clear Fraunhofer linesprovideusefulinformation on VCF • (asdemonstratedby GOSAT) • „Differential reflectance“ essentiallyunaffectedbyscattering • Requires „goodcalibration“ (e.g., smallenough „zero-level offsets“) and high enough SNR 3

  4. CarbonSat BESD/C Jacobian Matrix VCF signalfromclearFraunhoerlines ~1% 4

  5. CarbonSat: Simulated VCF retrieval Buchwitz et al., AMTD, 2013 5

  6. CarbonSat: Simulated VCF retrieval VCF fromCarbonSatsingleobservations: Precision: ~0.3 mW/m2/nm/sr (1-sigma, clear Fraunhofer linesonly) • Biasesof simple intitialalgorithm: • ~0.2 mW/m2/nm/sr • (seestandarddeviation) Buchwitz et al., AMTD, 2013 6

  7. Whyis VCF an interesting (by-)product ? • For a betterunderstandingofthecarboncycle, wewouldliketoknowboth, thegrossandthenetfluxesof CO2: • AtmosphericCO2measurements -> CO2netfluxes • VCF measurements -> GrossPrimary Productivity (GPP) Frankenberg et al., GRL, 2011 7

  8. Space-baseddemonstrationusing GOSAT Terrestrial VCF (Frankenberg et al.) Frankenberg et al., 2011 GOSAT Frankenberg et al., 2011 MPI-BGC Model GPP 8

  9. … andotherinstruments (SCIAMACHY, GOME, GOME-2) Joiner et al., 2013 GOME-2 GOSAT 9

  10. Summary andConclusions • ItcanbeexpectedthatCarbonSat will deliver a high-quality Vegetation Chlorophyll Fluorescencedataproduct • Estimatedsinglemeasurementprecision (1-sigma): • ~0.3 mW/m2/nm/sr • High accuracy due touseof Clear Fraunhofer Lines • Space-baseddemonstrationby GOSAT (variouspublications Frankenberg et al., Joiner et al., Guanter et al.) but also SCIAMACHY (Joiner et al., 2012) andveryrecentlyGOME-2 (Joineret al., 2013) 10

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