European Space Agency
is organizing a
FIDUCIAL INTER-COMPARISON EXPERIMENT FOR SENTINEL-3
AT THE ACQUA ALTA OCEANOGRAPHIC TOWER
Rescheduled to July 2018
off the Gulf of Venice, Italy, in the northern Adriatic Sea
Please follow the info here to get the latest updates on planning of the activity.
To support the ESA Sentinel-2 and Sentinel-3 missions, a radiometric inter-comparison exercise is scheduled to take place at the AAOT in the end of July, beginning of August 2017 over eight days for simultaneous deployment of in- and above-water water radiometers. The use of multi- sensor and method comparisons at the AAOT will provide the volume and quality of data for a stand-alone publication in a high impact factor journal.
The Acqua Alta Oceanographic Tower (AAOT)
The Acqua Alta Oceanographic Tower (AAOT) off the Gulf of Venice, Italy, in the northern Adriatic Sea is a purpose built steel tower with a platform containing an instrument house to facilitate the measurement of ocean properties under exceptionably stable conditions. It has a long history of use for satellite ocean colour validation and development during recent NASA and ESA missions (Zibordi et al. 2006) and offers excellent deployment conditions for above water, floating and underwater profiling systems (e.g. Hooker et al. 2005). It was used throughout the ESA MERIS mission to characterise measurement uncertainties in radiometers for the validation of ocean colour products (Zibordi et al. 2002).
The Atlantic Meridional Transect (AMT)
There are few calibration and validation sites in the blue water oligotrophic gyres of the global oceans, because of the cost of accessing and maintaining measurement platforms in such remote locations. The Atlantic Meridional Transect (AMT) cruise is conducted between the UK and the sparsely sampled South Atlantic during the annual passage from October to November of a NERC ship (RRS James Clark Ross, RRS James Cook or RRS Discovery). The transect traverses several ocean provinces in the North and South Atlantic Gyres, but also the productive waters of the Celtic Sea, Patagonian Shelf and Equatorial upwelling zone. It has been operated by the Plymouth Marine Laboratory (PML) in collaboration with National Oceanography Centre (NOC) Southampton over the past two decades and the research has included validation of ocean colour satellite data. The AMT has an excellent heritage for ocean colour (OC) satellite calibration and validation. At IOC in 2014 and 2015, AMT was heralded as one of NASA SeaWiFS 10 greatest highlights and it was recommended this ocean observing platform be funded to provide vital calibration / validation data for future satellite missions. From September to October 2017, FRM4SOC will conduct a field inter-comparison experiment on AMT27 to compare the performance of a suite of radiometers deployed along the AMT track.
The Field Inter-Comparison Experiment will deploy a range of radiometers using different methods to characterise differences between methods, assess data consistency and characterise uncertainties between instruments under different conditions and a range of environments.
FIDUCIAL INTER-COMPARISON EXPERIMENT FOR SENTINEL-3 AT THE ACQUA ALTA OCEANOGRAPHIC TOWER, VENICE, ITALY
FRM4SOC FICE is rescheduled to July 2018. Please follow the information on our webpage to get the latest information on planning of the activity.
The Acqua Alta Oceanographic Tower in off the Gulf of Venice, Italy, in the northern Adriatic Sea is a purpose built steel tower with a platform containing an instrument house to facilitate the measurement of ocean properties under exceptionably stable conditions. The platform has a long history of optical measurements to support and validate both NASA and ESA ocean colour missions (Zibordi et al. 2006; 2009b). An autonomous OMS has been developed at the tower, the data from which are widely used and accessed by the ocean colour community for satellite validation (Zibordi et al. 2004b, 2009c). Both in- and above-water optical measurements at the AAOT are taken under near ideal conditions due to the stability of the platform which has a fixed geometry, the frequency of clear sky conditions, the relatively low sun zenith angles and moderate to low sea states that are experienced at the tower. The water type at the tower can vary from clear open sea to turbid coastal. The atmospheric conditions are mostly dominated by continental and occasionally maritime, aerosols. This variability offers the opportunity perform field inter-comparisons under a wide range of environmental conditions. Continuous data acquisition of above water radiometry coupled with field campaigns to characterise the in water optics makes this site unique in the ability to inter-compare an array of sensors and methods at any one time.
Information about practicalities will be available soon.