AERONET-OC: Gloria Istanbul, 10-11 November 2011. Giuseppe Zibordi.

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Presentation transcript:

AERONET-OC: Gloria Istanbul, November Giuseppe Zibordi

1.Traceable (with defined uncertainties quantified, when appropriate, through reference standards); 2.Globally distributed (ideally representing the wide range of geophysical conditions that remote sensing products are expected to observe); 3.Continuous (time-series of quality assured data are fundamental for assessing remote sensing products from successive space missions); 4.Cross-site consistent (uncertainties should be likely the same for all measurement sites and measurement conditions); 5.Accessible (availability through suitable data policies, is a key element for any cal/val program). Requirements for field data supporting cal/val programs

AERONET – Ocean Color is a sub-network of the Aerosol Robotic Network (AERONET), relying on modified sun-photometers to support ocean color validation activities with highly consistent time-series of L WN ( ) and  a ( ). G.Zibordi et al. A Network for Standardized Ocean Color Validation Measurements. Eos Transactions, 87: 293, 297, AERONET-OC Autonomous radiometers operated on fixed platforms in coastal regions; Identical measuring systems and protocols, sensor calibrated using a single reference source and method, and data processed with the same code; Standardized products of normalized water-leaving radiance and aerosol optical thickness. Rationale:

1.Calibration service performed by JRC (from 2002 to 2008) and GSFC (from 2009) for above-water radiometric measurements (comparisons between JRC and NASA have shown differences on average below 2%). 2.SeaPRISMs operated from fixed deployment platforms. 3.Meteorological satellites (i.e., METEOSAT, GOES) or computers. 4.AERONET-OC data handling system (part of AERONET). 5.Marine and atmospheric QA products (i.e., L WN and  a ( ) at the 412, 443, 488, 531, 551, 667, 870 and 1020 nm nominal center-wavelengths). 6.Products accessibility through internet with a specified data policy. AERONET-OC: the network elements SeaPRISMCal-service 1 2 Satellite or PC 3 AERONET AERONET-OCProductsWEB 4 56 SeaPRISM

AERONET-OC (2002-present) NASA manages the network infrastructure (i.e., handles the instruments calibration and, data collection, processing and distribution within AERONET). JRC has the scientific responsibility of the processing algorithms and performs the quality assurance of data products. PIs establish and maintain individual AERONET-OC sites. Current management and responsibilities Planned sites Current sites Potential sites

Current AERONET-OC sites SiteRegionLon.Lat.StructureResponsible Institution AAOT (2002-ongoing) Adriatic Sea  N  E Oceanographic tower Joint Research Centre (EU) MVCO (2004-ongoing) Mid-Atlantic Bight o N o WOceanographic tower University of New Hampshire (USA) GDLT (2005-ongoing) Baltic Proper  N  E LighthouseJoint Research Centre (EU) COVE (2005-ongoing) Mid-Atlantic Bight  N  W LighthouseNational Aeronautics and Space Administration (USA) HLT (2006-ongoing) Gulf of Finland  N  E LighthouseJoint Research Centre (EU) AABP ( ) Persian Gulf  N  E Oil platformJoint Research Centre (EU) Palgrunden (2008-ongoing) Palgrunden Lake  N  E LighthouseUniversity of Stockholm (S) Lucinda (2009-ongoing) Coral Sea18.519°S °EJettyCommonwealth Scientific and Industrial Research Organisation (AU) LISCO (2009-ongoing) Long Island Sound °N73.342°WPlatformCity College of New York (USA) WaveCIS_Site_CSI_6 (2010-ongoing) Gulf of Mexico28.867°N90.483°WOil platformLouisiana State University (USA) Gloria (2010-ongoing) Black Sea  N  E Oil platformJoint Research Centre (EU)

AERONET-OC data applications Time Series for environmental analysis Validation of primary ocean color products Assessment of cross-mission primary products Regional vicarious calibration of space sensors Bias-reduction in regional primary products

Site: AAOT Location: Northern Adriatic Sea Water type: Case-1/Case-2 (sed. dom.) Water depth: 17 m (height: 15 m) Distance: 8 nm Period: 2002-present Site: GDLT Location: Northern Baltic Proper Water type: Case-2 (y.s. dom.) Water depth: 16 m (height: 26 m) Distance: 9 nm Period: 2005-present (summer) Site: AABT Location: Persian Gulf Water type: Case-1 (?) Water depth: 23 m (height: 24 m) Distance: 80 nm Period: Site: HLT Location: Gulf of Finland Water type: Case-2 (y.s. dom.) Water depth: 13 m (height: 30 m) Distance: 12 nm Period: 2006-present (summer) Zibordi, G., Holben, B., Slutsker, I., Giles, D’Alimonte, D., Mélin, F., Berthon, J.-F., Vandemark, D., Feng, H., Schuster, G., Fabbri, B. E., Kaitala, S., Seppälä, J. (2009). AERONET-OC: a network for the validation of Ocean Color primary radiometric products. JTECH 26,

Inter-Annual Stability of Satellite Ocean Color Sensors

Assessment of Satellite Ocean Color Primary Products

Gloria Site: Gloria Location: Black Sea Water type: Case-2 (sed. dom.) Water depth: 50 m (height: 30 m) Distance: ~20 nm Period: 2010-present Gloria Gloria Platform SeaPRISM Complex Logistics

L WN from Gloria Gloria (2011) BiOMaP ( )

Future AERONET-OC Site in the Black Sea? Gloria Galata