Mark Scruggs, National Park Service
description
Transcript of Mark Scruggs, National Park Service
Understanding Haze in Big Bend National Park Big Bend Regional Aerosol and Visibility
Observational (BRAVO) StudyMark Scruggs, National Park Service
Presented at the BRAVO Public Meeting Alpine, Texas September 22, 2004
Annual Extinction by ComponentBig Bend National Park--Best Days
Coarse Mass Nitrate OrganicsSoil Soot Sulfate
Ext
inct
ion
(Mm
-1)
0
1
2
3
4
5
6
7
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
Annual Extinction by ComponentBig Bend National Park--Worst Days
Coarse Mass Nitrate OrganicsSoil Soot Sulfate
Ext
inct
ion
(Mm
-1)
0
10
20
30
40
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
Background - Why study haze at Big Bend NP?
A beautiful, remote, and scenic park
16 1/Mm / 10 yr
4.3 1/Mm /10 yr
Insignificant
0
10
20
30
40
50
60
70
90 92 94 96 98 00 02Year
Part
icul
ate
Bex
t (1/
Mm
)
With Some of the worst haze in the west …And Getting Worse
Summary of IMPROVE Extinction Trends by Group and ComponentBig Bend National Park
Bext is Reconstructed Extinction Excluding Rayleigh
Component Bext Coarse Mass Nitrate OrganicsSoil Soot Sulfate
Slop
e (M
m-1
/yr)
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
Group10 90 100
0 to 0.1
0.1 to 0.2 0.2 to 0.3
0.3 to 0.4
0.4 to 0.5 0.5 to 0.6 0.6 to 0.7 0.7 to 0.8 0.8 to 0.9 0.9 to 1
R-squared of Regression Between Ammonium Sulfate Extinction and RBext
So, what did we learn from the BRAVO Study?