(BRAVO) Study: Final Report. - Desert Research Institute

Final Report — September 2004
Figure 1-3. Examples of geographic distribution of the fraction of time that air parcels spend during the
five days prior to arriving at Big Bend National Park for the months of January, May, July and
September based upon a five-year analysis period (1998 to 2002).
Mexico
Eastern U.S.
Texas
40
40
40
30
30
30
20
20
20
10
10
10
0
J F M A M J
J A S O N D
0
J F M A M J J A S O N D
0
J F M A M J J A S O N D
40
30
20
10
0
Western U.S.
J F M A M J J A S O N D
40
30
20
10
0
Gulf of Mexico
J F M A M J J A S O N D
40
30
20
10
0
Other
J F M A M J J A S O N D
Figure 1-4. Monthly fractions of time that air parcels spend in a region prior to arrival at Big Bend,
based on five-day back trajectory calculations for the five-year period from 1998 to 2002. The lines
shown over the months of July through October correspond to the values during the BRAVO Study
period in 1999. The plot labeled “Other” represents locations beyond the other five regions.
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