Estimation of the PAR irradiance ratio and its variability under clear-sky conditions at ieodo in the east china sea |
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| Authors: | Do -Seong Byun Yang -Ki Cho |
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| Institution: | (1) Ocean Research Laboratory, National Oceanographic Research Institute, 400-800 Incheon, Korea;(2) Department of Oceanography, College of Natural Sciences, Chonnam National University, 500-757 Gwangju, Korea |
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| Abstract: | Determining ‘photosynthetically active radiation’ (PAR) is a key part of calculating phytoplankton productivity in a biogeochemical
model. We explore the daily and seasonal variability in the ratio of PAR irradiance to total irradiance that occurred at Ieodo
Ocean Research Station (IORS) in the East China Sea under clear-sky conditions in 2004 using a simple radiative transfer model
(RTM). Meteorological data observed at IORS and aerosol optical properties derived from Aerosol Robotic Network observations
at Gosan are used for the RTM. Preliminary results suggest that the use of simple PA R irradianceratio values is appropriate
in calculating phytoplankton productivity as follows: an average of 0.44 (±0.01) in January to an average of 0.48 (±0.01)
in July, with average daily variabilities over these periods of about 0.016 (±0.008) and 0.025 (±0.008), respectively. The
model experiments demonstrate that variations in the major controlling input parameters (i.e. solar zenith angle, precipitable
water vapor and aerosol optical thickness) cause PAR irradiance ratio variation at daily and seasonal timescales. Further,
increases (>0.012) in the PAR irradiance ratio just below the sea-surface are positively correlated with high solar zenith
angles and strong wind stresses relative to those just above the sea-surface. |
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| Keywords: | PAR irradiance radiative transfer model ecosystem model East China Sea Ieodo |
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