Validation of MERIS water quality products in Murchison Bay, Lake Victoria - Preliminary results

被引：5

作者：

Okullo, W. ^{[1
,2
]}

Hamre, B. ^{[1
]}

Frette, O. ^{[1
]}

Stamnes, J. J. ^{[1
]}

Sorensen, K. ^{[3
]}

Ssenyonga, T. ^{[1
,2
]}

Hokedal, J. ^{[3
,4
]}

Stamnes, K. ^{[5
]}

Steigen, A. ^{[6
]}

机构：

[1] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[2] Makerere Univ, Dept Phys, Kampala, Uganda

[3] Norwegian Inst Water Res NIVA, Oslo, Norway

[4] Narvik Univ Coll, Narvik, Norway

[5] Stevens Inst Technol, Hoboken, NJ 07030 USA

[6] Univ Bergen, Inst Bot, N-5007 Bergen, Norway

来源：

INTERNATIONAL JOURNAL OF REMOTE SENSING | 2011年 / 32卷 / 19期

关键词：

OCEANIC WATERS; MODEL; COASTAL; SEAWIFS; LIGHT;

D O I：

10.1080/01431161.2010.506895

中图分类号：

TP7 [遥感技术];

学科分类号：

081102 ; 0816 ; 081602 ; 083002 ; 1404 ;

摘要：

As a step forward to validating the retrieval algorithm associated with the MERIS (Medium Resolution Imaging Spectrometer) sensor onboard the European Space Agency's ENVISAT satellite, we compare scaling factors for a(pig)(442) (pigment absorption coefficient at 442 nm) versus chl-a concentration, and for b(p)(440) (scattering coefficient for particles at 440 nm) versus TSM (total suspended matter) concentration, as well as in situ measurements of chl-a and TSM concentrations in Murchison Bay, Lake Victoria, with MERIS level 2 products. Our comparisons show that MERIS chl-a data products underestimate the in situ chl-a concentration by a factor of about 0.6, and that MERIS level 2 products overestimate the in situ TSM concentration and the yellow substance absorption coefficient by a factor of about 2. Application of a local inherent optical property (IOP) scaling factor improves the retrieval provided by MERIS level 2 products. The MERIS level 2 products also underestimate the water-leaving reflectance. These discrepancies between retrievals from MERIS data and in situ measurements are due to the current imperfect atmospheric correction algorithm for inland waters. Therefore, a need arises to develop site-specific bio-optical models and to improve existing MERIS retrieval algorithms.

引用

页码：5541 / 5563

页数：23

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