Seasonal and spatial distribution patterns of atmospheric phosphorus deposition to Lake Simcoe, ON

Brown, Laura J.; Taleban, Vahid; Gharabaghi, Bahram; Weiss, Lee E.

doi:10.1016/j.jglr.2011.01.004

Cited by 31 publications

(19 citation statements)

References 29 publications

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“…Such different precipitation patterns can cause large differences in wet deposition across mountain ranges (Fain et al, 2011;NADP, 2012). Assessing spatial deposition patterns using snowpack sampling at multiple locations across a watershed should allow for better characterization of basin-wide deposition patterns as well as assessment of impacts of nearby urban areas versus regional and global sources of atmospheric deposition (Brown et al, 2011;Kuhn, 2001;Morales-Baquero et al, 2006;Vicars and Sickman, 2011).…”

Section: Pearson Et Al: Nutrient and Mercury Deposition And Storamentioning

confidence: 99%

“…Specifically, dust-derived inputs originate from geologic sources and erosion from both agricultural and urban activity, while burning from both forest and domestic fires contributes additional particulate matter in the form of ash and soot (Raison et al, 1985). Differences in P deposition rates between the dry and wet seasons as well as spatial patterns associated with wind direction and soil erosion vulnerability have been observed in the southern Sierra Nevada; Ontario, Canada; and the Mediterranean (Brown et al, 2011;Morales-Baquero et al, 2006;Vicars and Sickman, 2011).…”

Section: Phosphorusmentioning

confidence: 99%

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Nutrient and mercury deposition and storage in an alpine snowpack of the Sierra Nevada, USA

et al. 2015

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Abstract. Biweekly snowpack core samples were collected at seven sites along two elevation gradients in the Tahoe Basin during two consecutive snow years to evaluate total wintertime snowpack accumulation of nutrients and pollutants in a high-elevation watershed of the Sierra Nevada. Additional sampling of wet deposition and detailed snow pit profiles were conducted the following year to compare wet deposition to snowpack storage and assess the vertical dynamics of snowpack nitrogen, phosphorus, and mercury. Results show that, on average, organic N comprised 48 % of all snowpack N, while nitrate (NO − 3 -N) and TAN (total ammonia nitrogen) made up 25 and 27 %, respectively. Snowpack NO − 3 -N concentrations were relatively uniform across sampling sites over the sampling seasons and showed little difference between seasonal wet deposition and integrated snow pit concentrations. These patterns are in agreement with previous studies that identify wet deposition as the dominant source of wintertime NO − 3 -N deposition. However, vertical snow pit profiles showed highly variable concentrations of NO − 3 -N within the snowpack indicative of additional deposition and in-snowpack dynamics. Unlike NO − 3 -N, snowpack TAN doubled towards the end of winter, which we attribute to a strong dry deposition component which was particularly pronounced in late winter and spring. Organic N concentrations in the snowpack were highly variable (from 35 to 70 %) and showed no clear temporal, spatial, or vertical trends throughout the season. Integrated snowpack organic N concentrations were up to 2.5 times higher than seasonal wet deposition, likely due to microbial immobilization of inorganic N as evident by coinciding increases in organic N and decreases in inorganic N in deeper, aged snow. Spatial and temporal deposition patterns of snowpack P were consistent with particulate-bound dry deposition inputs and strong impacts from in-basin sources causing up to 6 times greater enrichment at urban locations compared to remote sites. Snowpack Hg showed little temporal variability and was dominated by particulate-bound forms (78 % on average). Dissolved Hg concentrations were consistently lower in snowpack than in wet deposition, which we attribute to photochemically driven gaseous re-emission. In agreement with this pattern is a significant positive relationship between snowpack Hg and elevation, attributed to a combination of increased snow accumulation at higher elevations causing limited light penetration and lower photochemical re-emission losses in deeper, higher-elevation snowpack. Finally, estimates of basin-wide loading based on spatially extrapolated concentrations and a satellite-based snow water equivalent reconstruction model identify snowpack chemical loading from atmospheric deposition as a substantial source of nutrients and pollutants to the Lake Tahoe Basin, accounting for 113 t of N, 9.3 t of P, and 1.2 kg of Hg each year.

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Section: Pearson Et Al: Nutrient and Mercury Deposition And Storamentioning

confidence: 99%

Section: Phosphorusmentioning

confidence: 99%

Nutrient and mercury deposition and storage in an alpine snowpack of the Sierra Nevada, USA

et al. 2015

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“…To expand this analysis, we identified all comparable P deposition data through an extensive literature review (see Text S1.1 for a detailed description of this review proces sand Table S8, uploaded separately, for all sites and measurements). Through this review, we identified 23 papers and 1 monitoring network containing data from 98 sites reporting total wet and dry TP deposition within a 700‐km radius of the GLB from 1970 to 2011 (see Hargan et al, ; Foster, ; Linsey et al, ; Swank & Henderson, ; Eisenreich et al, ; Koelliker et al, ; Pearson & Fisher, ; Munger, ; Scheider et al, ; Schindler et al, ; Schindler et al, ; Schindler et al, ; Schinlder & Nighswander, ; Winter et al, ; Brown et al, ; Murphy, ; Yang et al,; ; Wright, ; Winter et al, ; Robertson et al, ; Delumyea & Petel, ; Brinson et al, ; Linsey et al, ). We assumed that P deposition rates have remained largely stable through time.…”

Section: Methodsmentioning

confidence: 99%

Quantifying Landscape Nutrient Inputs With Spatially Explicit Nutrient Source Estimate Maps

et al. 2020

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Nutrient management is an essential part of watershed planning worldwide to protect water resources from both widespread landscape inputs of nutrients (N and P) and point source emissions. To provide information to regional watershed planners and better understand nutrient sources, we developed the Spatially Explicit Nutrient Source Estimate Map (SENSEmap) to quantify individual sources of N and P at their entry points in the landscape. We modeled seven sources of N and six sources of P across the U.S. Great Lakes Basin at 30‐m resolution: atmospheric deposition, septic systems, chemical nonagricultural fertilizer, chemical agricultural fertilizer, manure, nitrogen fixation, and point sources. By modeling these sources, we provide a more detailed view of nutrient inputs to the landscape beyond what would be possible from land use alone. We found that 71% and 88% of N and P, respectively, came from agricultural sources. The nature of agricultural nutrient inputs varied significantly across the basin, as relative contributions of chemical agricultural fertilizers, manure, and N fixation changed according to diverse land use practices regionally. We then applied k‐means cluster analysis and identified nine Nutrient Input Landscapes (NILs) with N and P source characteristics, grouped into intensive agricultural, urban, and rural landscapes. These NILs can offer insights into landscape variability that land use data alone cannot; within agricultural NILs, application of chemical fertilizer and manure varied greatly, but land uses were similar. These NILs can provide a framework for broadly categorizing watersheds that may prove useful to both ecological and management practices.

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“…Atmospheric deposition of phosphorus enriched soil particles is a major nonpoint source that accounted for approximately 26% of the total annual phosphorus load to the lake from 2002 to 2007 (LSRCA and MOE, 2009;Winter et al, 2002Winter et al, , 2007. In an effort to begin identifying local anthropogenic activities that contribute to atmospheric loading, Brown et al (2011) characterized the temporal variability and spatial distribution of phosphorus deposition to the lake between the 2004/2005 and 2006/2007 hydrologic years. Atmospheric loading was seasonal with, on average, 80% of deposition occurring in the spring and summer.…”

Section: Phosphorus Loadingmentioning

confidence: 99%

Introduction and summary of research on Lake Simcoe: Research, monitoring, and restoration of a large lake and its watershed

Palmer¹,

Winter²,

Young³

et al. 2011

Journal of Great Lakes Research

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Seasonal and spatial distribution patterns of atmospheric phosphorus deposition to Lake Simcoe, ON

Cited by 31 publications

References 29 publications

Nutrient and mercury deposition and storage in an alpine snowpack of the Sierra Nevada, USA

Nutrient and mercury deposition and storage in an alpine snowpack of the Sierra Nevada, USA

Quantifying Landscape Nutrient Inputs With Spatially Explicit Nutrient Source Estimate Maps

Introduction and summary of research on Lake Simcoe: Research, monitoring, and restoration of a large lake and its watershed

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