Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer

Lars Chresten Lund-Hansen; Thorbjørn Joest Andersen; Morten Holtegaard Nielsen; Morten Pejrup

doi:10.1007/s12237-010-9300-7

Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer

Lars Chresten Lund-Hansen, Thorbjørn Joest Andersen, Morten Holtegaard Nielsen, Morten Pejrup

Geologi

35 Citationer (Scopus)

Abstract

Optical constituents as suspended particulate
matter (SPM), chlorophyll (Chl-a), colored dissolved
organic matter (CDOM), and grain sizes were obtained on
a transect in the arctic fjord-type estuary Kangerlussuaq
(66°) in August 2007 along with optical properties. These
comprised diffuse attenuation coefficient of downwelling
PAR (Kd(PAR)), upwelling PAR (Ku(PAR)), particle beam
attenuation coefficient (cp), and irradiance reflectance R
(-0, PAR). PAR is white light between 400 and 700 nm.
The estuary receives melt water from the Greenland Inland
Ice and stations covered a transect from the very high
turbid melt water outlet to clear marine waters. Results
showed a strong spatial variation with high values a s for
suspended matter concentrations, CDOM, diffuse attenuation
coefficient Kd(PAR), particle beam attenuation
coefficients (cp), and reflectance R(-0, PAR) at the melt
water outlet. Values of optical constituents and properties
decreased with distance from the melt water outlet to a
more or less constant level in central and outer part of the
estuary. There was a strong correlation between inorganic
suspended matter (SPMI) and diffuse attenuation coefficient
Kd(PAR) (r2=0.92) and also for particle beam
attenuation coefficient (cp; r2=0.93). The obtained SPMI
specific attenuation—Kd
*(PAR)=0.13 m2g-1 SPMI—and
the SPMI specific particle beam attenuation—cp
*=
0.72 m2g-1—coefficients were about two times higher
than average literature values. Irradiance reflectance R(-0,
PAR) was comparatively high (0.09-0.20) and showed a
high (r2=0.80) correlation with Ku(PAR). Scattering
dominated relative to absorption—b(PAR)/a(PAR)=12.3.
Results strongly indicated that the high values in the
optical properties were related to the very fine particle
sizes (mean=2–6 µm) of the suspended sediment. Data
and results are discussed and compared to similar studies
from both temperate and tropical estuaries.

Originalsprog	Engelsk
Tidsskrift	Estuaries and Coasts
Vol/bind	33
Udgave nummer	6
Sider (fra-til)	1442-1451
ISSN	1559-2723
DOI	https://doi.org/10.1007/s12237-010-9300-7
Status	Udgivet - 2010

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Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer. / Lund-Hansen, Lars Chresten; Andersen, Thorbjørn Joest; Nielsen, Morten Holtegaard et al.

I: Estuaries and Coasts, Bind 33, Nr. 6, 2010, s. 1442-1451.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

@article{09d9901424ec4286a9d284c296834a60,

title = "Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer",

abstract = "Optical constituents as suspended particulatematter (SPM), chlorophyll (Chl-a), colored dissolvedorganic matter (CDOM), and grain sizes were obtained ona transect in the arctic fjord-type estuary Kangerlussuaq(66°) in August 2007 along with optical properties. Thesecomprised diffuse attenuation coefficient of downwellingPAR (Kd(PAR)), upwelling PAR (Ku(PAR)), particle beamattenuation coefficient (cp), and irradiance reflectance R(-0, PAR). PAR is white light between 400 and 700 nm.The estuary receives melt water from the Greenland InlandIce and stations covered a transect from the very highturbid melt water outlet to clear marine waters. Resultsshowed a strong spatial variation with high values a s forsuspended matter concentrations, CDOM, diffuse attenuationcoefficient Kd(PAR), particle beam attenuationcoefficients (cp), and reflectance R(-0, PAR) at the meltwater outlet. Values of optical constituents and propertiesdecreased with distance from the melt water outlet to amore or less constant level in central and outer part of theestuary. There was a strong correlation between inorganicsuspended matter (SPMI) and diffuse attenuation coefficientKd(PAR) (r2=0.92) and also for particle beamattenuation coefficient (cp; r2=0.93). The obtained SPMIspecific attenuation—Kd*(PAR)=0.13 m2g-1 SPMI—andthe SPMI specific particle beam attenuation—cp*=0.72 m2g-1—coefficients were about two times higherthan average literature values. Irradiance reflectance R(-0,PAR) was comparatively high (0.09-0.20) and showed ahigh (r2=0.80) correlation with Ku(PAR). Scatteringdominated relative to absorption—b(PAR)/a(PAR)=12.3.Results strongly indicated that the high values in theoptical properties were related to the very fine particlesizes (mean=2–6 µm) of the suspended sediment. Dataand results are discussed and compared to similar studiesfrom both temperate and tropical estuaries.",

author = "Lund-Hansen, {Lars Chresten} and Andersen, {Thorbj{\o}rn Joest} and Nielsen, {Morten Holtegaard} and Morten Pejrup",

year = "2010",

doi = "10.1007/s12237-010-9300-7",

language = "English",

volume = "33",

pages = "1442--1451",

journal = "Estuaries and Coasts",

issn = "1559-2723",

publisher = "Springer",

number = "6",

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TY - JOUR

T1 - Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer

AU - Lund-Hansen, Lars Chresten

AU - Andersen, Thorbjørn Joest

AU - Nielsen, Morten Holtegaard

AU - Pejrup, Morten

PY - 2010

Y1 - 2010

N2 - Optical constituents as suspended particulatematter (SPM), chlorophyll (Chl-a), colored dissolvedorganic matter (CDOM), and grain sizes were obtained ona transect in the arctic fjord-type estuary Kangerlussuaq(66°) in August 2007 along with optical properties. Thesecomprised diffuse attenuation coefficient of downwellingPAR (Kd(PAR)), upwelling PAR (Ku(PAR)), particle beamattenuation coefficient (cp), and irradiance reflectance R(-0, PAR). PAR is white light between 400 and 700 nm.The estuary receives melt water from the Greenland InlandIce and stations covered a transect from the very highturbid melt water outlet to clear marine waters. Resultsshowed a strong spatial variation with high values a s forsuspended matter concentrations, CDOM, diffuse attenuationcoefficient Kd(PAR), particle beam attenuationcoefficients (cp), and reflectance R(-0, PAR) at the meltwater outlet. Values of optical constituents and propertiesdecreased with distance from the melt water outlet to amore or less constant level in central and outer part of theestuary. There was a strong correlation between inorganicsuspended matter (SPMI) and diffuse attenuation coefficientKd(PAR) (r2=0.92) and also for particle beamattenuation coefficient (cp; r2=0.93). The obtained SPMIspecific attenuation—Kd*(PAR)=0.13 m2g-1 SPMI—andthe SPMI specific particle beam attenuation—cp*=0.72 m2g-1—coefficients were about two times higherthan average literature values. Irradiance reflectance R(-0,PAR) was comparatively high (0.09-0.20) and showed ahigh (r2=0.80) correlation with Ku(PAR). Scatteringdominated relative to absorption—b(PAR)/a(PAR)=12.3.Results strongly indicated that the high values in theoptical properties were related to the very fine particlesizes (mean=2–6 µm) of the suspended sediment. Dataand results are discussed and compared to similar studiesfrom both temperate and tropical estuaries.

AB - Optical constituents as suspended particulatematter (SPM), chlorophyll (Chl-a), colored dissolvedorganic matter (CDOM), and grain sizes were obtained ona transect in the arctic fjord-type estuary Kangerlussuaq(66°) in August 2007 along with optical properties. Thesecomprised diffuse attenuation coefficient of downwellingPAR (Kd(PAR)), upwelling PAR (Ku(PAR)), particle beamattenuation coefficient (cp), and irradiance reflectance R(-0, PAR). PAR is white light between 400 and 700 nm.The estuary receives melt water from the Greenland InlandIce and stations covered a transect from the very highturbid melt water outlet to clear marine waters. Resultsshowed a strong spatial variation with high values a s forsuspended matter concentrations, CDOM, diffuse attenuationcoefficient Kd(PAR), particle beam attenuationcoefficients (cp), and reflectance R(-0, PAR) at the meltwater outlet. Values of optical constituents and propertiesdecreased with distance from the melt water outlet to amore or less constant level in central and outer part of theestuary. There was a strong correlation between inorganicsuspended matter (SPMI) and diffuse attenuation coefficientKd(PAR) (r2=0.92) and also for particle beamattenuation coefficient (cp; r2=0.93). The obtained SPMIspecific attenuation—Kd*(PAR)=0.13 m2g-1 SPMI—andthe SPMI specific particle beam attenuation—cp*=0.72 m2g-1—coefficients were about two times higherthan average literature values. Irradiance reflectance R(-0,PAR) was comparatively high (0.09-0.20) and showed ahigh (r2=0.80) correlation with Ku(PAR). Scatteringdominated relative to absorption—b(PAR)/a(PAR)=12.3.Results strongly indicated that the high values in theoptical properties were related to the very fine particlesizes (mean=2–6 µm) of the suspended sediment. Dataand results are discussed and compared to similar studiesfrom both temperate and tropical estuaries.

U2 - 10.1007/s12237-010-9300-7

DO - 10.1007/s12237-010-9300-7

M3 - Journal article

SN - 1559-2723

VL - 33

SP - 1442

EP - 1451

JO - Estuaries and Coasts

JF - Estuaries and Coasts

IS - 6

ER -

Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer

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