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Related Concept Videos

Linear Approximations01:23

Linear Approximations

For a differentiable function of two variables, linear approximation estimates values near a known point by replacing the curved surface with its tangent plane. Consider the function\begin{equation*}f(x,y)=x^2+3y^2\end{equation*}near the point (2, 1). The exact value at this point is f(2, 1) = 22 + 3(1)2 = 4 + 3 = 7.The linear approximation of f(x, y)) near (a, b) is\begin{equation*}L(x,y)=f(a,b)+f_x(a,b)(x-a)+f_y(a,b)(y-b)\end{equation*}First, compute the partial derivatives: fx(x, y) = 2x and...

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Impact Assessment of Repeated Exposure of Organotypic 3D Bronchial and Nasal Tissue Culture Models to Whole Cigarette Smoke
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Impact Assessment of Repeated Exposure of Organotypic 3D Bronchial and Nasal Tissue Culture Models to Whole Cigarette Smoke

Published on: February 12, 2015

Single-source impact analysis using three-dimensional air quality models.

Michelle S Bergin1, Armistead G Russell, Mehmet T Odman

  • 1School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA. michelle.bergin@dnr.state.ga.us

Journal of the Air & Waste Management Association (1995)
|October 23, 2008
PubMed
Summary
This summary is machine-generated.

A single power plant's excess nitrogen oxides emissions significantly impact regional ozone levels. Modeling shows ozone increases up to 2.2 ppbv across multiple states, with localized decreases also occurring.

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Published on: May 13, 2020

Area of Science:

  • Atmospheric Chemistry
  • Air Quality Modeling
  • Environmental Science

Background:

  • Assessing individual emission source impacts on secondary air pollutants like ozone is complex.
  • These impacts require understanding nonlinear processes, sensitivity to emissions, and long-range transport.
  • Efficient air quality management necessitates evaluating these effects.

Purpose of the Study:

  • To evaluate the impact of excess nitrogen oxides (NOx) emissions from a single power plant on regional ozone concentrations.
  • To assess ozone response to single-source emissions plumes as part of a Clean Air Act compliance action.

Main Methods:

  • Utilized two three-dimensional regional photochemical air quality models.
  • Applied "brute-force" (B-F) and decoupled direct method (DDM) sensitivity analyses.
  • Evaluated excess NOx emissions of 2000-3000 t/month during May, July, and August.

Main Results:

  • Decoupled Direct Method (DDM) showed maximum 1-hr averaged ozone increases of 1.8, 1.3, and 2.2 ppbv in May, July, and August, respectively.
  • Ozone increases exceeding 0.5 ppbv were observed across seven states.
  • Localized ozone decreases were also simulated, with maximum decreases up to 3.6 ppbv in Ohio during August.

Conclusions:

  • Single-source NOx emissions can lead to significant regional ozone increases and localized decreases.
  • Ozone increases were found to be greater in magnitude and spatial extent than reductions.
  • The study highlights the importance of detailed modeling for air quality management and regulatory compliance.