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

L. C. Lund-Hansen, T. J. Andersen, Morten Holtegaard Nielsen, M. Pejrup

Research output: Contribution to journalJournal articleResearchpeer-review

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 (66A degrees) in August 2007 along with optical properties. These comprised diffuse attenuation coefficient of downwelling PAR (K (d)(PAR)), upwelling PAR (K (u)(PAR)), particle beam attenuation coefficient (c (p)), 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 as for suspended matter concentrations, CDOM, diffuse attenuation coefficient K (d)(PAR), particle beam attenuation coefficients (c (p)), 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 K (d)(PAR) (r (2) = 0.92) and also for particle beam attenuation coefficient (c (p); r (2) = 0.93). The obtained SPMI specific attenuation-K (d) (*) (PAR) = 0.13 m(2) g(-1) SPMI-and the SPMI specific particle beam attenuation-c (p) (*) = 0.72 m(2) g(-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 (r (2) = 0.80) correlation with K (u)(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 mu m) of the suspended sediment. Data and results are discussed and compared to similar studies from both temperate and tropical estuaries.
Original languageEnglish
JournalEstuaries and Coasts
Volume33
Issue number6
Pages (from-to)1442-1451
ISSN1559-2723
DOIs
Publication statusPublished - 2010

Keywords

  • Greenland
  • Particle beam attenuation
  • Reflectance
  • PAR attenuation
  • Suspended matter
  • Fjord-type estuary
  • Glacio-marine

Cite this

Lund-Hansen, L. C. ; Andersen, T. J. ; Nielsen, Morten Holtegaard ; Pejrup, M. / Suspended Matter, Chl-a, CDOM, Grain Sizes, and Optical Properties in the Arctic Fjord-Type Estuary, Kangerlussuaq, West Greenland During Summer. In: Estuaries and Coasts. 2010 ; Vol. 33, No. 6. pp. 1442-1451.
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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 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 (66A degrees) in August 2007 along with optical properties. These comprised diffuse attenuation coefficient of downwelling PAR (K (d)(PAR)), upwelling PAR (K (u)(PAR)), particle beam attenuation coefficient (c (p)), 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 as for suspended matter concentrations, CDOM, diffuse attenuation coefficient K (d)(PAR), particle beam attenuation coefficients (c (p)), 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 K (d)(PAR) (r (2) = 0.92) and also for particle beam attenuation coefficient (c (p); r (2) = 0.93). The obtained SPMI specific attenuation-K (d) (*) (PAR) = 0.13 m(2) g(-1) SPMI-and the SPMI specific particle beam attenuation-c (p) (*) = 0.72 m(2) g(-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 (r (2) = 0.80) correlation with K (u)(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 mu m) of the suspended sediment. Data and results are discussed and compared to similar studies from both temperate and tropical estuaries.",
keywords = "Greenland, Particle beam attenuation, Reflectance, PAR attenuation, Suspended matter, Fjord-type estuary, Glacio-marine",
author = "Lund-Hansen, {L. C.} and Andersen, {T. J.} and Nielsen, {Morten Holtegaard} and M. Pejrup",
year = "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, L. C.; Andersen, T. J.; Nielsen, Morten Holtegaard; Pejrup, M.

In: Estuaries and Coasts, Vol. 33, No. 6, 2010, p. 1442-1451.

Research output: Contribution to journalJournal articleResearchpeer-review

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, L. C.

AU - Andersen, T. J.

AU - Nielsen, Morten Holtegaard

AU - Pejrup, M.

PY - 2010

Y1 - 2010

N2 - 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 (66A degrees) in August 2007 along with optical properties. These comprised diffuse attenuation coefficient of downwelling PAR (K (d)(PAR)), upwelling PAR (K (u)(PAR)), particle beam attenuation coefficient (c (p)), 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 as for suspended matter concentrations, CDOM, diffuse attenuation coefficient K (d)(PAR), particle beam attenuation coefficients (c (p)), 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 K (d)(PAR) (r (2) = 0.92) and also for particle beam attenuation coefficient (c (p); r (2) = 0.93). The obtained SPMI specific attenuation-K (d) (*) (PAR) = 0.13 m(2) g(-1) SPMI-and the SPMI specific particle beam attenuation-c (p) (*) = 0.72 m(2) g(-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 (r (2) = 0.80) correlation with K (u)(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 mu m) of the suspended sediment. Data and results are discussed and compared to similar studies from both temperate and tropical estuaries.

AB - 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 (66A degrees) in August 2007 along with optical properties. These comprised diffuse attenuation coefficient of downwelling PAR (K (d)(PAR)), upwelling PAR (K (u)(PAR)), particle beam attenuation coefficient (c (p)), 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 as for suspended matter concentrations, CDOM, diffuse attenuation coefficient K (d)(PAR), particle beam attenuation coefficients (c (p)), 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 K (d)(PAR) (r (2) = 0.92) and also for particle beam attenuation coefficient (c (p); r (2) = 0.93). The obtained SPMI specific attenuation-K (d) (*) (PAR) = 0.13 m(2) g(-1) SPMI-and the SPMI specific particle beam attenuation-c (p) (*) = 0.72 m(2) g(-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 (r (2) = 0.80) correlation with K (u)(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 mu m) of the suspended sediment. Data and results are discussed and compared to similar studies from both temperate and tropical estuaries.

KW - Greenland

KW - Particle beam attenuation

KW - Reflectance

KW - PAR attenuation

KW - Suspended matter

KW - Fjord-type estuary

KW - Glacio-marine

U2 - 10.1007/s12237-010-9300-7

DO - 10.1007/s12237-010-9300-7

M3 - Journal article

VL - 33

SP - 1442

EP - 1451

JO - Estuaries and Coasts

JF - Estuaries and Coasts

SN - 1559-2723

IS - 6

ER -