Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake

Caitlin A L Riddick, Peter D. Hunter, Andrew N. Tyler, Victor Martinez-Vicente, Hajnalka Horváth, Attila W. Kovács, Lajos Vörös, Tom Preston, Mátyás Présing

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In order to improve robustness of remote sensing algorithms for lakes, it is vital to understand the variability of inherent optical properties (IOPs) and their mass-specific representations (SIOPs). In this study, absorption coefficients for particulate and dissolved constituents were measured at 38 stations distributed over a biogeochemical gradient in Lake Balaton, Hungary. There was a large range of phytoplankton absorption (aph(λ)) over blue and red wavelengths (aph(440) = 0.11-4.39 m-1, aph(675) = 0.048-2.52 m-1), while there was less variability in chlorophyll-specific phytoplankton absorption (a∗ph(λ)) in the lake (a∗ph(440) = 0.022 ± 0.0046 m2 mg-1, a∗ph(675) = 0.010 ± 0.0020 m2 mg-1) and adjoining wetland system, Kis-Balaton (a∗ph(440) = 0.017 ± 0.0015 m2 mg-1, a∗ph(675) = 0.0088 ± 0.0017 m2 mg-1). However, in the UV, a∗ph(350) significantly increased with increasing distance from the main inflow (Zala River). This was likely due to variable production of photoprotective pigments (e.g., MAAs) in response to the decreasing gradient of colored dissolved organic matter (CDOM). The slope of CDOM absorption (SCDOM) also increased from west to east due to larger terrestrial CDOM input in the western basins. Absorption by nonalgal particles (aNAP(λ)) was highly influenced by inorganic particulates, as a result of the largely mineral sediments in Balaton. The relative contributions to the absorption budget varied more widely than oceans with a greater contribution from NAP (up to 30%), and wind speed affected the proportion attributed to NAP, phytoplankton, or CDOM. Ultimately, these data provide knowledge of the heterogeneity of (S)IOPs in Lake Balaton, suggesting the full range of variability must be considered for future improvement of analytical algorithms for constituent retrieval in inland waters.

Original languageEnglish
Pages (from-to)7040-7066
Number of pages27
JournalJournal of Geophysical Research: Space Physics
Volume120
Issue number10
DOIs
Publication statusPublished - Oct 1 2015

Fingerprint

absorption coefficient
dissolved organic matter
lakes
Biological materials
Lakes
Phytoplankton
absorptivity
phytoplankton
gradients
lake
Optical properties
optical property
optical properties
particulates
inland waters
Wetlands
wetlands
Chlorophyll
Hungary
Pigments

Keywords

  • absorption
  • chlorophyll-a∗phycocyanin
  • IOPs
  • Lake Balaton
  • phytoplankton

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Oceanography

Cite this

Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake. / Riddick, Caitlin A L; Hunter, Peter D.; Tyler, Andrew N.; Martinez-Vicente, Victor; Horváth, Hajnalka; Kovács, Attila W.; Vörös, Lajos; Preston, Tom; Présing, Mátyás.

In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 10, 01.10.2015, p. 7040-7066.

Research output: Contribution to journalArticle

Riddick, CAL, Hunter, PD, Tyler, AN, Martinez-Vicente, V, Horváth, H, Kovács, AW, Vörös, L, Preston, T & Présing, M 2015, 'Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake', Journal of Geophysical Research: Space Physics, vol. 120, no. 10, pp. 7040-7066. https://doi.org/10.1002/2015JC011202
Riddick, Caitlin A L ; Hunter, Peter D. ; Tyler, Andrew N. ; Martinez-Vicente, Victor ; Horváth, Hajnalka ; Kovács, Attila W. ; Vörös, Lajos ; Preston, Tom ; Présing, Mátyás. / Spatial variability of absorption coefficients over a biogeochemical gradient in a large and optically complex shallow lake. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 10. pp. 7040-7066.
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