Detecting the Zambezi River Plume using Observed Optical Properties

Siddorn, John; Bowers, D.G.; Hoguane, A. M.

doi:10.1016/s0025-326x(01)00053-4

Cited by 54 publications

(36 citation statements)

References 17 publications

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“…Our result suggests that a freshwater discharge from the Changjiang was the dominant CDOM source. Siddorn et al [2001] and Binding and Bowers [2003] reported similar results for other coastal regions (Salinity = aa g (440) + b; a = À16.2 $ À7.0, b = 34.6 $ 35.8). Binding and Bowers [2003] indicated that high river discharge (high CDOM concentration) caused gentler gradient in the relationship between salinity and a g (l).…”

Section: Relationship Between In-situ a G (L) And Salinitysupporting

confidence: 69%

Mapping the low salinity Changjiang Diluted Water using satellite‐retrieved colored dissolved organic matter (CDOM) in the East China Sea during high river flow season

Sasaki¹,

Siswanto²,

Nishiuchi³

et al. 2008

Geophysical Research Letters

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Absorption coefficients of colored dissolved organic matter (CDOM) [ag(λ)] were measured and relationship with salinity was derived in the East China Sea (ECS) during summer when amount of the Changjiang River discharge is large. Low salinity Changjiang Diluted Water (CDW) was observed widely in the shelf region and was considered to be the main origin of CDOM, resulting in a strong relationship between salinity and ag(λ). Error of satellite ag(λ) estimated by the present ocean color algorithm could be corrected by satellite‐retrieved chlorophyll data. Satellite‐retrieved salinity could be predicted with about ±1.0 accuracy from satellite ag(λ) and the relation between salinity and ag(λ). Our study suggests that satellite‐derived ag(λ) can be an indicator of the low salinity CDW during summer.

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Section: Relationship Between In-situ a G (L) And Salinitysupporting

confidence: 69%

Mapping the low salinity Changjiang Diluted Water using satellite‐retrieved colored dissolved organic matter (CDOM) in the East China Sea during high river flow season

Sasaki¹,

Siswanto²,

Nishiuchi³

et al. 2008

Geophysical Research Letters

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“…From the point of view of remote sensing, the Baltic Sea comprises optical Case-2 waters. Because of the high freshwater input and the little exchange with the North Sea, the open Baltic Sea is optically dominated by coloured dissolved organic matter (Darecki & Stramski, 2004;Kratzer, 2000;Kratzer et al, 2003), which has been shown to be inversely related to salinity Højerslev et al, 1996;Kratzer et al, 2003;Siddorn et al, 2001). In the southern Baltic Sea, the high fluvial input leads to sediment plumes with high sediment loads.…”

Section: Area Descriptionmentioning

confidence: 99%

“…In order to derive reflectance from the TACCS data, we first derived the spectral shape of the diffuse attenuation-given that we only had a measure of K d (490) derived from the K d chain. This was done by using AC9 data measured during 2001-2002. The AC9 data was corrected for salinity and temperature, and processed according to WetLabs method 2, which assumes that the scattering correction is a fixed proportion of the scattering coefficient (WetLabs, 2007).…”

Section: -08-2002 Open Balticmentioning

confidence: 99%

Using MERIS full resolution data to monitor coastal waters — A case study from Himmerfjärden, a fjord-like bay in the northwestern Baltic Sea

Kratzer

Brockmann

Moore

2008

Remote Sensing of Environment

138

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“…The different inherent optical properties of coastal waters, for example, allow remotely sensed optical measurements to provide information on the dynamics and environmental parameters in regions of freshwater influence (e.g. Bowers et al 2004, Siddorn et al 2001, Vasilkov et al 1999, Stumpf and Pennock 1989. The presence of high levels of dissolved organic material (CDOM) in estuaries or coastal waters, derived from freshwater inputs, can provide strong colour signals.…”

Section: Introductionmentioning

confidence: 99%

“…When this is the dominant optical property of the water, concentration distributions of CDOM may be used to infer the distribution of salinity in the coastal zone (e.g. Bowers et al 2004, Siddorn et al 2001, Simpson and Brown 1987. In practice the reflectance of different-wavelength light depends on several parameters including CDOM, mineral suspended sediment concentrations and chlorophyll levels, such that optical models are used to estimate water properties (e.g.…”

Section: Introductionmentioning

confidence: 99%

Using digital cameras for river plume and water quality measurements

White

Feighery

Bowers

et al. 2005

International Journal of Remote Sensing

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The results from a pilot study in coastal waters off the east coast of Ireland using both an in situ and airborne mounted digital camera are described. In situ digital pictures are significantly affected by sea surface reflection. This can be eliminated with the use of a hollow pipe, attached to the camera lens, which intersects the sea surface such that a picture of light upwelled from beneath the surface is obtained. Used in this way, linear relations between both the ratio of red/green digital output (O/P) values (at a particular camera exposure) and the difference in green-red digital camera O/P were found with mineral suspended solid (MSS) concentration. A good comparison was also found between the ratios of red/ green upwelling light measured with the camera and a conventional irradiance sensor. Semi-empirical or analytical relationships between camera O/P and the inherent optical properties of the water could not be established, however. This was probably due, in part, to a lack of range in values for the water constituent parameters. An airborne mounted digital camera was used to successfully monitor the dynamics of a river plume discharging into the coastal water. The high dissolved organic material (CDOM) levels within the plume caused the plume to be easily visible in the digital imagery, with a significantly increased signal in the camera's red/green O/P values marking the spatial extent of the plume. The plume dynamics were principally controlled by the tidal flows in the coastal waters. During the ebb tide strong fronts, and inferred convergence zones, marked the edge of the river plume and were associated with increased values of the camera-derived red/green ratio. As slack water commenced, the plume expanded away from the source and became thinner, with a decreased red/ green signal. Associated with this time internal fronts were present within the plume's extent, marked by step changes, or spikes, in the camera's red/green values.

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Detecting the Zambezi River Plume using Observed Optical Properties

Cited by 54 publications

References 17 publications

Mapping the low salinity Changjiang Diluted Water using satellite‐retrieved colored dissolved organic matter (CDOM) in the East China Sea during high river flow season

Mapping the low salinity Changjiang Diluted Water using satellite‐retrieved colored dissolved organic matter (CDOM) in the East China Sea during high river flow season

Using MERIS full resolution data to monitor coastal waters — A case study from Himmerfjärden, a fjord-like bay in the northwestern Baltic Sea

Using digital cameras for river plume and water quality measurements

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