This Week Mass Balance: Sources - Sinks Lifetime / Residence Time Steady – State Models READING: Chapter 3 of text Announcements Problem Set 1 due Mon.

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Presentation transcript:

This Week Mass Balance: Sources - Sinks Lifetime / Residence Time Steady – State Models READING: Chapter 3 of text Announcements Problem Set 1 due Mon Oct 8. Office hours will be Describing and Predicting Change

Today: Describing change composition Goal of Atmospheric Chemistry Concept 1: Mass Balance Concept 2: Lifetime

To describe the change in the atmospheric concentration of chemicals as a function of time and location. Primary Goal of Atmospheric Chemistry

CO 2 Rate of Change Give at least two rates of change for CO 2 What do we learn about the sources and removal of atmospheric CO 2 based on this graph/analysis?

Factors Affecting d[X]/dt in a Box Emissions Transport Chemistry Deposition Anthropogenic Biogenic Natural Flux out or Flux in Wet X X X X Dry X XO O2O2 O3O3 O2O2 O

Atmospheric Lifetimes Lifetime = Amount Removal Rate X Chemical lifetime/s Z A B Transport lifetime X Deposition lifetime X X Sink-specific lifetimes allow determination of the importance of a particular process for controlling the fate of a species

1.CO 2 is lost from the atmosphere by photosynthesis and physical dissolution into the oceans. Photosynthesis by the biosphere leads to the uptake of ~ 60 Pg C/yr of atmospheric CO 2. The oceans take up CO 2 at about the same rate. Based on these values, what are the sink-specific and overall lifetimes of CO 2 ? What does this calculation suggest about “fixing global warming”? 2. Fossil fuel burning and deforestation are the major anthropogenic sources of CO 2 to the atmosphere. Given that CO 2 was ~ constant before the industrial revolution, it appears these are the dominant sources of new CO 2. Together, they add 8 Pg C/yr of CO 2. Given the measured atmospheric growth rate of CO 2 we determined last class (2ppm/yr), derive a second estimate of the atmospheric lifetime of CO Shouldn’t 1 and 2 give the same result? Questions

Steady-State: When is it the case? Steady state solution (dm/dt = 0) Initial condition m(0) Characteristic time  = 1/k for reaching steady state decay of initial condition

Today: Models One-box Models Multi-box Models Moving the Box Model Reading: Chapter 3 in text

DEFINE PROBLEM USE MODEL make hypotheses or predictions DESIGN MODEL (make simplifications) TEST MODEL with observations Models are simplified representations of reality. Observations of the real system are required to test the model. Urban air pollution Stratospheric Ozone Depletion Atmosphere-Ocean interactions Model Development and Application Loop

One Box Model Inflow F in Outflow F out X E Emission Deposition D Chemical production P L Chemical loss Atmospheric “box”; spatial distribution of X within box is not resolved mass balance: lifetime:

If X has first order loss, then in column moving across city Column Model: A Moving Box Typically temperature inversion defines “mixing depth” Emission Flux E (amnt/cm 2 /s) [X] L0 x

Questions 1.Choose the most appropriate modeling strategy for the following problems (1-box, 2-box, n-box, plume/column model): a. exchange of a uniformly mixed greenhouse gas between the stratosphere and troposphere b. production of ozone downwind of an urban area c. the vertical and horizontally resolved abundance of a reactive emission like CO. 2. Suppose operators of a 1-box model of Seattle’s urban “air shed” predicted that the concentration of pollutant emitted downtown was going to rise to a unhealthy level in the U-District. Should you believe them, why or why not?