POSTER Session 4

THE WISP ORCA: A NEW HANDHELD SPECTROMETER SYSTEM FOR OPTICAL MEASUREMENTS ABOVE WATER

Based on the legacy of the WISP-3 and WISPstation instruments, we have designed a new lightweight portable spectrometer system, the WISP ORCA. Mobley’s recommendations for upward and downward zenith angles are observed to minimize solar glint. Optical pathways are optimized to allow hyperspectral observations between 350 and 1100 nm. The instrument includes onboard GPS and orientation sensors and is controlled via Bluetooth using a mobile phone, which also serves as a display and 4G sender/receiver. Although data processing takes place in the cloud, limited off-line use of the instrument is supported. As with the WISPstation, a single spectrometer coupled to an optical multiplexer is used. Each WISP ORCA will be radiometrically calibrated relative to a NIST-traceable reference instrument and features full wavelength calibration and non-linearity correction. The WISP Orca can be used for monitoring and for satellite product calibration and validation, even by non-expert users. As a novelty, WISP ORCA processing will allow to distinguish between case-1 and case-2 waters. This leads to improved water quality parameters estimation for operational use. Water type distinction is based on a thorough analysis of over 50.000 WISP-3 measurements worldwide. Processing includes a generic water color measurement based on the Forel-Ule theory. The instrument has been tested in coastal- and inland waters in the Netherlands and shows excellent similarity with observations from existing instruments.

Marnix Laanen, Water Insight B.V., the Netherlands, [email protected], https://orcid.org/0000-0003-1659-9065

Steef Peters, Water Insight B.V., the Netherlands, [email protected]

Semhar Ghbrehiwot, Water Insight B.V., the Netherlands, [email protected]

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