14:15–14:30 | ABSTRACT 1273
A CONSISTENCY CHECK BETWEEN BGC-ARGO AND SATELLITE-DERIVED DIFFUSE ATTENUATION COEFFICIENT AND INHERENT OPTICAL PROPERTIES
Biogeochemical Argo (BGC-Argo) floats complement satellite measurements of ocean optical properties, but cross-platform consistency is essential for integrated ocean observations. Here we propose a novel semi-analytical scheme (BGC2IOP) that extends BGC-Argo optical measurements from diffuse attenuation coefficient (Kd) and particulate backscattering (bbp) to absorption coefficients of total (a), phytoplankton (aph), and detritus plus colored dissolved organic matter (adg). The cross-platform consistency is then evaluated using 2,674 quality-controlled matchups between BGC-Argo and MODIS-Aqua. Our results show that applying a unified reference depth (z10%, where irradiance drops to 10% of its surface value) yields consistent Kd retrievals at 380, 412, and 490 nm, with correlation coefficients (r) of ~0.8 and median absolute percentage deviations (MdAPD) of ~12%. BGC-Argo-derived inherent optical properties (IOPs)—namely a, adg, and bbp— also agree well with satellite retrievals (r = 0.7–0.9; MdAPD = 12–24%). A notable exception is aph(440), where BGC-Argo retrievals are ~47% systematically higher than satellite estimates despite strong correlation, likely due to widespread subsurface chlorophyll maxima within z10% layer that are largely undetectable by satellite observations. Overall, robust cross-platform consistency is achieved for Kd and most IOPs, while aph consistency requires further refinement. More importantly, BGC2IOP enables multi-source data fusion and could substantially expand the availability and global coverage of IOPs products.
Xiaolong Yu, Xiamen University, [email protected], https://orcid.org/0000-0003-2813-0854
Zhongping Lee, Xiamen University, [email protected]
XIuling Wu, Xiamen University, [email protected]
Xiaogang Xing, Second Institute of Oceanography (SIO), Ministry of Natural Resources, [email protected]
Xu Li, Xiamen University, [email protected]
Yankun Hou, Xiamen University, [email protected]
