![]() Finally, when using the spectroradiometer in data logging mode, use a suitable measuring frequency. Secondly, as some wavelengths of light may not be present at depth (e.g., red light rapidly absorbed by the water), it may be necessary to conduct spectral attenuation measurements relatively close to the surface. To aid the comparison of data between locations, it is advisable to conduct all measurements within 2 hours of solar noon, on days with similar atmospheric conditions and to obtain above-surface spectra immediately before/after the sub-surface reading. The above surface spectrum can change significantly during the day due to changes in solar geometry, atmospheric constituents and cloud cover. However, there are a few notable exceptions. Keiko Aioi, in Global Seagrass Research Methods, 2001 19.7.4 MethodsĪs a spectroradiometer can be used for both instantaneous and continuous monitoring (if attached to a logger), the method for this instrument is similar to that outlined for PPFD measurements ( Sections 19.6 and 19.7).
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