Effect of high atmospheric Nitrogen Dioxide (NO2) concentration on GOCI ocean color products

Title
Effect of high atmospheric Nitrogen Dioxide (NO2) concentration on GOCI ocean color products
Author(s)
김동희; 박명숙; 안재현
KIOST Author(s)
Park, Minsun(박민선)Ahn, Jae Hyun(안재현)
Publication Year
2019-12-11
Abstract
This study investigates the effect of atmospheric NO2 on Geostationary Ocean Color Imager (GOCI) ocean color products over the seas around Korean Peninsula. For ocean color remote sensing, absorption and scattering contributions by ocean components (phytoplankton, Colored Dissolved Organic Matter (CDOM), Non-Algal Particles (NAP), etc.) tend to be much weaker than those from the atmosphere (e.g., gas and aerosol). Thus, the contribution from atmospheric components has to be properly removed to retrieve more accurate ocean color products. Whereas the current GOCI atmospheric correction considers absorption by ozone and water vapor, the absorption effect by NO2 is not applied. Recently, some previous studies have shown that high NO2 conditions can cause serious errors in the Top of Atmosphere (TOA) reflectance especially in the blue channel. We are developing NO2 absorption correction technique in GOCI ocean color algorithm. Currently, we examinewhether there is any notable spatial pattern in GOCI remote sensing reflectances (Rrs) and Chlorophyll-a (Chl-a) for high NO2 absorption cases using Ozone Monitoring Instrument (OMI) NO2 data. 6S radiative transfer model was used to calculate transmittance with and without NO2 absorption in the high NO2 conditions. The GOCI-II will be on loaded on Geo-Kompsat-2B(GK-2B) together with Geostationary Environmental Monitoring Satellite (GEMS). Through the combination with GEMS da
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/21033
Bibliographic Citation
AWOC/KJWOC, pp.1, 2019
Publisher
AWOC/KJWOC
Type
Conference
Language
English
Publisher
AWOC/KJWOC
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