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- Title
Empirical ocean-color algorithms to retrieve chlorophyll- a, total suspended matter, and colored dissolved organic matter absorption coefficient in the Yellow and East China Seas.
- Authors
Siswanto, Eko; Tang, Junwu; Yamaguchi, Hisashi; Ahn, Yu-Hwan; Ishizaka, Joji; Yoo, Sinjae; Kim, Sang-Woo; Kiyomoto, Yoko; Yamada, Keiko; Chiang, Connie; Kawamura, Hiroshi
- Abstract
A bio-optical dataset collected during the 1998-2007 period in the Yellow and East China Seas (YECS) was used to provide alternative empirical ocean-color algorithms in the retrieval of chlorophyll- a (Chl- a), total suspended matter (TSM), and colored dissolved organic matter (CDOM) absorption coefficients at 440 nm (ag). Assuming that remote-sensing reflectance (Rrs) could be retrieved accurately, empirical algorithms for T (regionally tuned Tassan's Chl- a algorithm) in case-1 waters (T2i in case-2 waters), T (regionally tuned Tassan's TSM algorithm), and T or C (regionally tuned Tassan's or Carder's ag algorithm) were able to retrieve Chl- a, TSM, and ag with uncertainties as high as 35, 46, and 35%, respectively. Applying the standard SeaWiFS Rrs, T was not viable in the eastern part of the YECS, which was associated with an inaccurate SeaWiFS Rrs retrieval because of improper atmospheric correction. T behaved better than other algorithms in the turbid case-2 waters, although overestimation was still observed. To retrieve more reliable Chl- a estimates with standard SeaWiFS Rrs in turbid water (a proxy for case-2 waters), we modified T for data with SeaWiFS normalized water-leaving radiance at 555 nm (nLw) > 2 mW cm μm sr (T2s). Finally, with standard SeaWiFS Rrs, we recommend switching algorithms from T2s (for case-2 waters) to MOC (SeaWiFS-modified NASA OC4v4 standard algorithm for case-1 waters) for retrieving Chl- a, which resulted in uncertainties as high as 49%. To retrieve TSM and ag using SeaWiFS Rrs, we recommend empirical algorithms for T (pre-SeaWiFS-modified form) and MT or MC (SeaWiFS Rrs-modified forms of T or C). These could retrieve with uncertainties as high as 82 and 52%, respectively.
- Subjects
YELLOW Sea; EAST China Sea; ORGANIC compounds; REFLECTANCE; SUSPENDED sediments
- Publication
Journal of Oceanography, 2011, Vol 67, Issue 5, p627
- ISSN
0916-8370
- Publication type
Article
- DOI
10.1007/s10872-011-0062-z