Regional validation of SeaDAS algorithms and remote sensing of a complex frontal structure in the southern Irish Sea

Agnes Valerie Dudek, Alex Cunningham, David McKee

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

In situ measurements of downward irradiance and upward radiance, together with determinations of surface concentrations of chlorophyll, suspended particles and colored dissolved organic material (CDOM) were made at 126 stations during 5 cruises in the Irish and Celtic Seas. Twenty one of these stations provided acceptable match-ups with SeaWiFS ocean color images. Normalized water leaving radiances for the selected stations derived from SeaWiFS data were well correlated with those measured at the sea surface (r2 = 0.92). In situ observations from the whole region, which covered a wide range of water types including turbid coastal regions and a coccolithophore bloom, were therefore used to test the performance of SeaDAS algorithms for surface chlorophyll concentration (Chl) and the diffuse attenuation coefficient at 490 nm (Kd490). In general, Chl was over-estimated and Ka490 under-estimated by SeaDAS. However the algorithms performed acceptably in some regions such as St George's Channel (r2 = 0.70 for Chl, r2 = 0.74 for Kd490). Examination of SeaWiFS and AVHRR images of this region for July 2002 revealed complex patterns of surface temperature and chlorophyll with a high degree of spatial correlation. The highest chlorophyll concentrations occurred on the stratified side of the Irish/Celtic Sea front.

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Chlorophyll
chlorophylls
Remote Sensing
remote sensing
Remote sensing
SeaWiFS
Sea-viewing Wide Field-of-view Sensor
stations
Radiance
radiance
AVHRR
Ocean Color
Water
In Situ Measurements
Advanced Very High Resolution Radiometer
Advanced very high resolution radiometers (AVHRR)
Irradiance
attenuation coefficients
Spatial Correlation
organic materials

Keywords

  • algorithms
  • chlorophyll concentration
  • coastal waters
  • diffuse attenuation coefficient
  • normalized water leaving radiance
  • ocean colour
  • SeaWiFS
  • validation

Cite this

@article{0993be5b184a41d7ac84b5c05399add7,
title = "Regional validation of SeaDAS algorithms and remote sensing of a complex frontal structure in the southern Irish Sea",
abstract = "In situ measurements of downward irradiance and upward radiance, together with determinations of surface concentrations of chlorophyll, suspended particles and colored dissolved organic material (CDOM) were made at 126 stations during 5 cruises in the Irish and Celtic Seas. Twenty one of these stations provided acceptable match-ups with SeaWiFS ocean color images. Normalized water leaving radiances for the selected stations derived from SeaWiFS data were well correlated with those measured at the sea surface (r2 = 0.92). In situ observations from the whole region, which covered a wide range of water types including turbid coastal regions and a coccolithophore bloom, were therefore used to test the performance of SeaDAS algorithms for surface chlorophyll concentration (Chl) and the diffuse attenuation coefficient at 490 nm (Kd490). In general, Chl was over-estimated and Ka490 under-estimated by SeaDAS. However the algorithms performed acceptably in some regions such as St George's Channel (r2 = 0.70 for Chl, r2 = 0.74 for Kd490). Examination of SeaWiFS and AVHRR images of this region for July 2002 revealed complex patterns of surface temperature and chlorophyll with a high degree of spatial correlation. The highest chlorophyll concentrations occurred on the stratified side of the Irish/Celtic Sea front.",
keywords = "algorithms, chlorophyll concentration, coastal waters, diffuse attenuation coefficient, normalized water leaving radiance, ocean colour, SeaWiFS, validation",
author = "Dudek, {Agnes Valerie} and Alex Cunningham and David McKee",
year = "2004",
month = "2",
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doi = "10.1117/12.510484",
language = "English",
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journal = "Proceedings of SPIE",
issn = "0277-786X",

}

Regional validation of SeaDAS algorithms and remote sensing of a complex frontal structure in the southern Irish Sea. / Dudek, Agnes Valerie; Cunningham, Alex; McKee, David.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 5233, 26.02.2004, p. 69-76.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Regional validation of SeaDAS algorithms and remote sensing of a complex frontal structure in the southern Irish Sea

AU - Dudek, Agnes Valerie

AU - Cunningham, Alex

AU - McKee, David

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N2 - In situ measurements of downward irradiance and upward radiance, together with determinations of surface concentrations of chlorophyll, suspended particles and colored dissolved organic material (CDOM) were made at 126 stations during 5 cruises in the Irish and Celtic Seas. Twenty one of these stations provided acceptable match-ups with SeaWiFS ocean color images. Normalized water leaving radiances for the selected stations derived from SeaWiFS data were well correlated with those measured at the sea surface (r2 = 0.92). In situ observations from the whole region, which covered a wide range of water types including turbid coastal regions and a coccolithophore bloom, were therefore used to test the performance of SeaDAS algorithms for surface chlorophyll concentration (Chl) and the diffuse attenuation coefficient at 490 nm (Kd490). In general, Chl was over-estimated and Ka490 under-estimated by SeaDAS. However the algorithms performed acceptably in some regions such as St George's Channel (r2 = 0.70 for Chl, r2 = 0.74 for Kd490). Examination of SeaWiFS and AVHRR images of this region for July 2002 revealed complex patterns of surface temperature and chlorophyll with a high degree of spatial correlation. The highest chlorophyll concentrations occurred on the stratified side of the Irish/Celtic Sea front.

AB - In situ measurements of downward irradiance and upward radiance, together with determinations of surface concentrations of chlorophyll, suspended particles and colored dissolved organic material (CDOM) were made at 126 stations during 5 cruises in the Irish and Celtic Seas. Twenty one of these stations provided acceptable match-ups with SeaWiFS ocean color images. Normalized water leaving radiances for the selected stations derived from SeaWiFS data were well correlated with those measured at the sea surface (r2 = 0.92). In situ observations from the whole region, which covered a wide range of water types including turbid coastal regions and a coccolithophore bloom, were therefore used to test the performance of SeaDAS algorithms for surface chlorophyll concentration (Chl) and the diffuse attenuation coefficient at 490 nm (Kd490). In general, Chl was over-estimated and Ka490 under-estimated by SeaDAS. However the algorithms performed acceptably in some regions such as St George's Channel (r2 = 0.70 for Chl, r2 = 0.74 for Kd490). Examination of SeaWiFS and AVHRR images of this region for July 2002 revealed complex patterns of surface temperature and chlorophyll with a high degree of spatial correlation. The highest chlorophyll concentrations occurred on the stratified side of the Irish/Celtic Sea front.

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