Modeling Cl concentration in Cayuga Lake, U.S.A.

Effler, Steven W.; Auer, Martin T.; Johnson, Ned A.

doi:10.1007/bf00279264

Cited by 19 publications

(5 citation statements)

References 6 publications

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“…a). The Q dynamics of this stream are a good proxy for overall tributary inputs (Effler et al ) and minerogenic sediment (Peng and Effler ). Particularly large increases in scattering levels were observed at the shelf site after runoff events (e.g., early July event; Fig.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…This is the numerical counterpart of the approach followed experimentally by Effler et al . [], who estimated the residence time for Cayuga Lake, where salt mining had led to the introduction of chloride above natural concentrations until 1970. The authors made their estimation by observing the rate at which chloride concentrations decreased after 1970 and by measuring the salt load brought in by the stream flow.…”

Section: Resultsmentioning

confidence: 99%

A simple approach to the evaluation of the actual water renewal time of natural stratified lakes

Pilotti

Simoncelli

Valerio

2014

Water Resources Research

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In natural lakes, where thermal stratification hinders complete mixing, the theoretical value T 0 of the water renewal time provides a low-order approximation to the time T 37 when 37% of the original water is still present within the lake; this time could be operatively regarded as the actual value of the water renewal time. In this paper, we present a simple nonparametric model to estimate the age distribution of water within stratified natural lakes, taking into account fundamental aspects of its mass exchange and thermal evolution. This distribution provides a straightforward way to compute T 37 . The model is presented as a system of ordinary differential equations along with a MATLAB script for its numerical solution, so that it can be easily applied to lakes where a minimum of limnological data are available, without the need of extensive meteorological data set and modeling expertise that an hydrodynamic model would require to the same purpose. The case of a deep oligomictic Italian prealpine lake (Lake Iseo) is considered: after a positive comparison with the results obtained using a 1-D lake hydrodynamic model, the reiterated application to the available time series allows to approximate the water age probability distribution. This distribution is used to compute the actual value of the water renewal time, that resulted T 37 5 1.6T 0 .

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“…As a practical matter, it is difficult to justify the incremental benefit of expanding monitoring (both Q and constituent concentrations) to tributaries that individually represent such small fractions (≤3.5%) of the watershed area. The prorating of tributary flows according to watershed areas of gaged tributaries is supported in this case by the earlier success in modeling long‐term trends for a conservative substance in the lake based on similar prorating protocols (Effler et al ., ). The case for the prorating of Q ‐weighted concentrations for these inputs is less compelling.…”

Section: Discussionmentioning

confidence: 97%

Apportionment of bioavailable phosphorus loads entering Cayuga Lake, New York

Prestigiacomo

Effler

Gelda

et al. 2015

J American Water Resour Assoc

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The integration of the phosphorus (P) bioavailability concept into a P loading analysis for Cayuga Lake, New York, is documented. Components of the analyses included the: (1) monitoring of particulate P (PP), soluble unreactive P (SUP), and soluble reactive P (SRP), supported by biweekly and runoff event‐based sampling of the lake's four largest tributaries; (2) development of relationships between tributary P concentrations and flow; (3) algal bioavailability assays of PP, SUP, and SRP from primary tributaries and the three largest point sources; and (4) development of P loading estimates to apportion contributions according to individual nonpoint and point sources, and to represent the effects of interannual variations in tributary flows on P loads. Tributary SRP, SUP, and PP are demonstrated to be completely, mostly, and less bioavailable, respectively. The highest mean bioavailability for PP was observed for the stream with the highest agriculture land use. Point source contributions to the total bioavailable P load (BAPL) are minor (5%), reflecting the benefit of reductions from recent treatment upgrades. The BAPL represented only about 26% of the total P load, because of the large contribution of the low bioavailable PP component. Most of BAPL (>70%) is received during high flow intervals. Large interannual variations in tributary flow and coupled BAPL will tend to mask future responses to changes in individual inputs.

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Modeling Cl concentration in Cayuga Lake, U.S.A.

Cited by 19 publications

References 6 publications

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

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

A simple approach to the evaluation of the actual water renewal time of natural stratified lakes

Apportionment of bioavailable phosphorus loads entering Cayuga Lake, New York

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