Characterizations of the light-scattering attributes of mineral particles in Lake Ontario and the effects of whiting

Peng, Feng; Effler, Steven W.

doi:10.1016/j.jglr.2011.07.002

Cited by 28 publications

(30 citation statements)

References 50 publications

(137 reference statements)

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“…D). CZCS SD(79‐85) and SeaWiFS SD(98‐04) seasonality was dominated by minima in August/September due to whiting events which were a common occurrence on the lake each year (Strong and Eadie ; Peng and Effler ). The frequency and intensity of whiting events have decreased over the last two decades, such that by the MODIS period the associated Z SD minimum was barely detected.…”

Section: Resultsmentioning

confidence: 99%

“…Additional uncertainty in the R rs∼550 ‐ Z SD relationship will be driven by spatial and temporal variability in the specific inherent optical properties (SIOPs) of particles in each lake system. Peng et al () and Peng and Effler () have described in detail the light scattering and absorption attributes of minerogenic particles in the Lakes and the variations in these properties. Binding et al () also described considerable variability in particulate and dissolved absorption in Lake Erie.…”

Section: Discussionmentioning

confidence: 99%

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Long term water clarity changes in North America's Great Lakes from multi‐sensor satellite observations

Binding

Greenberg

Watson

et al. 2015

Limnology & Oceanography

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Water clarity in North America's Laurentian Great Lakes has undergone considerable change over the last several decades as a consequence of invasive species, eutrophication, and implemented nutrient management practices. Satellite observations from the CZCS, SeaWiFS, and MODIS-Aqua sensors have been used in tandem with long term records of Secchi disk depth (Z SD ) to provide a retrospective analysis of spatial and temporal variations in water clarity over the Great Lakes. A simple empirical algorithm is presented, relating Z SD to remote-sensing reflectance at 550 nm (R rs550 ). Results suggest remarkable and complex changes in water clarity over the Great Lakes. Lakes Ontario, Huron, and Michigan have seen increases in average Z SD over the three sensor periods of 58%, 49%, and 62%, respectively. Lake Erie shows highly variable Z SD with no consistent long term trends, while Lake Superior has remained fairly consistent in its lake-wide water clarity conditions. Temporal trends document the decrease in whiting events on Lake Michigan while capturing the ongoing occurrence of these seasonal bright-water events on Lake Ontario. Results indicate a divergence in Z SD trends between nearshore and offshore environments; with larger increases in offshore than nearshore Z SD and some nearshore areas suggesting a decrease in Z SD . Offshore regions of Lakes Huron, Michigan, and Superior show diminished Z SD seasonality in contrast to increasing seasonal variance in the nearshore. Spatial and temporal variations in Z SD are in agreement with documented reductions in Great Lakes bioproductivity, degrading nearshore water quality, and changing biogeochemical processes influencing whiting events and sediment resuspension.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Long term water clarity changes in North America's Great Lakes from multi‐sensor satellite observations

Binding

Greenberg

Watson

et al. 2015

Limnology & Oceanography

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“…Resolution of the contributions of these types, described as the “reductionist approach” (Stramski et al ), offers the opportunity to identify the drivers of optical variability among systems and dynamics within individual systems. Progress in the partitioning of b p and b bp for lacustrine waters has been reported recently (Peng et al 2009 a ; Peng and Effler ; Effler and Peng ) through a two‐component modeling approach:

b_{normalp} = b_{normalm} + b_{normalo}

where b m and b o are the scattering coefficients of minerogenic and organic (of biogenic origin) particles, respectively ( b bp is partitioned analogously with the backscattering coefficients of the two components, b b,m and b b,o ). Central to this partitioning has been the development of a protocol to make forward estimates of b m and b b,m .…”

Section: List Of Frequently Used Abbreviations and Symbolsmentioning

confidence: 99%

Advancing two‐component partitioning of light scattering in C ayuga L ake, N ew Y ork

Peng

Effler

2015

Limnology & Oceanography

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The particulate scattering and backscattering coefficients (bp and bbp) were partitioned into the additive contributions of minerogenic (bm and bb,m) and organic (bo and bb,o) components for nearshore and pelagic areas of Cayuga Lake, New York, over a 7 month period in 2013. The analysis was based on paired measurements of (1) bulk bp and bbp, (2) light‐scattering properties of mineral particles, with an individual particle analysis (IPA) technique, and (3) concentrations of chlorophyll a ([Chl]) and particulate organic carbon (POC), as two indices to quantify organic particle scattering. bm and bb,m were estimated through Mie theory calculations with IPA results as inputs. bo and bb,o were estimated with both system‐specific and oceanic bio‐optical models parameterized on [Chl] or POC. POC performed better than [Chl] as the index for both bo and bb,o. The averages of the ratios (bm + bo) : bp and (bb,m + bb,o) : bbp at 660 nm, were 1.02 and 1.03, respectively; the average relative errors were 18.2% and 15.6%. Multiple empirical bio‐optical models developed for Case 1 oceanic waters (for bo and bb,o estimates) approached the closure performance of the system‐specific relationships. In addition to systematically accounting for more bbp than bp, terrigenous minerogenic particles made greater contributions to both bp and bbp in the nearshore area proximate to tributary inputs than in pelagic waters. A strong positive dependency of the backscattering ratio (bbp : bp) on the bm : bp ratio was observed for both nearshore and pelagic areas.

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“…Further, SDT is also affected by various inorganic particles in the water column and may therefore not always be a good indicator of lake trophic state. For example, Secchi depth was shallower in the fall of 2008 (5.0 m) than in the summer, despite lower fall chlorophyll a concentrations (1.7 mg l ¡1 ), likely due to carbonate precipitation (whiting event) observed at the time (Peng and Effler, 2011;Watkins et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Lake Ontario water quality during the 2003 and 2008 intensive field years and comparison with long-term trends

Holeck

Rudstam

Watkins

et al. 2015

Aquatic Ecosystem Health &Amp; Management

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Phosphorus loading declined between the 1970s and the 1990s, leading to oligotrophication of the offshore waters of Lake Ontario during that time period. Using lake-wide data from the intensive field years of 2003 and 2008 and from available long-term data sets on several trophic state indicators (total phosphorus [TP], soluble reactive silica [SRSi], chlorophyll a and Secchi disc transparency [SDT]), we tested the hypothesis that oligotrophication of the offshore waters of Lake Ontario has continued in the 2000s. Significant differences between 2003 and 2008 include higher spring (April) TP, SRSi, and SDT in 2008, lower summer (July–August) SDT in 2008, higher summer chlorophyll a in 2008, and lower fall (September) TP, SRSi, and chlorophyll a in 2008. The decline in SRSi from spring to summer was greater in 2008 than in 2003. Change point and regression analyses on the long-term data revealed no trend in spring TP since 1996, in summer chlorophyll a since 1994, in spring SDT since 1998, in spring SRSi or SRSi decline from spring to summer since 1999, or in summer SDT since 2001. Neither the comparison of the 2003 and 2008 surveys nor the analysis of the long-term data supported our hypothesis of continued oligotrophication of the offshore of Lake Ontario in the 2000s.

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Characterizations of the light-scattering attributes of mineral particles in Lake Ontario and the effects of whiting

Cited by 28 publications

References 50 publications

Long term water clarity changes in North America's Great Lakes from multi‐sensor satellite observations

Long term water clarity changes in North America's Great Lakes from multi‐sensor satellite observations

Advancing two‐component partitioning of light scattering in C ayuga L ake, N ew Y ork

Lake Ontario water quality during the 2003 and 2008 intensive field years and comparison with long-term trends

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