BIO-05\INT-06 Primary production estimation
Estimates of diurnal and daily Net Primary Productivity using the Geostationary Ocean Color Imager (GOCI) data
Jinghui WU* , Lamont Doherty Earth Observatory at Columbia University, NY, USA
Joaquim I. Goes, Lamont Doherty Earth Observatory at Columbia University, NY, USA
Helga do Rosario Gomes, Lamont Doherty Earth Observatory at Columbia University, NY, USA
Zhongping Lee, State Key Lab of Marine Environmental Science, College of Earth and Ocean Sciences, Xiamen University, Xiamen, China
Jae-Hoon Noh, Korean Institute of Ocean Science and Technology (KIOST), South Korea
Jianwei Wei, NOAA/NESDIS Center for Satellite Applications and Research, College Park, MD, USA; Global Science & Technology, Greenbelt, Maryland, MD, USA
Zhehai Shang, Institut de la Mer de Villefranche, IMEV, Sorbonne Université, Villefranche-sur-Mer 06230, France
Joseph Salisbury, University of New Hampshire, Durham, NH, USA
Antonio Mannino, Goddard Space Flight Centre, Maryland, USA
Wonkook Kim, Pusan National University, Busan, South Korea

For the past three decades, polar-orbiting ocean color satellites have provided local, regional to global scale estimates of oceanic net primary production that have greatly aided studies of ocean carbon cycling, food web dynamics and climate change. Despite considerable progress, accurate estimates of daily ocean productivity from space have not been realized because polar-orbiting satellites are unable to account for variations in phytoplankton physiology and carbon fixation rates from changing incident irradiance levels over the course of the day. Here we have attempted to exploit the unique short-temporal measurements provided by the Korean Geostationary Ocean Color Imager (GOCI), to obtain for the first time, diurnal and daily measurements of surface- and euphotic-column integrated Net Primary Productivity (NPP). These estimates are based on the Absorption Based Productivity Model (AbPM), and are calibrated with a bio-optical database of measurements made at different times of the day during the Korea-US Ocean Color (KORUS-OC) cruise in May-June, 2016. Photo-physiological rate estimates, varied across different water types encountered around the Korean Peninsula, but on account of their limited number, were regionally scaled through the use of dynamic optical-biogeochemical (O-BGC) Biomes. Comparisons of GOCI derived estimates of daily and weekly integrated NPP against in-situ measurements, clearly underscore the superiority of geostationary polar-orbiting ocean color satellites, which consider the dramatic short-term fluctuations in phytoplankton light absorption and incident irradiance fields over the course of the day.