Ozone Monitoring

 

 

 

All of the PRIMENet sites currently monitor ground-level ozone.

Ozone Monitor and Meteorological Station Site Information.  

Data available at http://www2.nature.nps.gov/ard/gas.

Site

Site ID

Latitude (N)

Longitude (W)

Elevation (m)

Ozone

Met. Station

Acadia

ACAD

44.37

68.26

122

10/82-present

06/91-present

Big Bend

BIBE

29.31

103.18

1052

09/90-present

09/90-present

Canyonlands

CANY

38.45

109.82

1814

07/92-present

07/92-present

Denali

DENA

63.73

148.96

661

07/87-present

07/87-present

Everglades

EVER

25.39

80.68

2

05/86-present

01/89-present

Glacier

GLAC

48.51

113.10

967

01/89-present

01/95-present

Great Smoky Mtns.

GRSM

35.63

83.94

793

07/88-present

07/88-present

Hawaii Volcanoes

HAVO

19.43

155.26

1215

installed 11/99

11/86 - present

Olympic

OLYM

48.10

123.43

125

08/85-present

05/91-present

Rocky Mountain

ROMO

40.28

105.55

2743

07/87-present

12/94-present

Sequoia/Kings Canyon

SEKI

36.57

118.78

1902

06/84-present

09/88-present

Shenandoah

SHEN

38.52

78.44

1073

05/83-present

01/88-present

Theodore Roosevelt

THRO

49.60

108.27

700

11/82-present

09/98-present

Virgin Islands

VIIS

18.34

64.80

80

04/98-present

05/98-present

    *Virgin Islands NP was not presented in Figure 3 because it was not in operation in 1997.

    *Only sites with continuous data for 1997, Big Bend, Canyonlands, Glacier, Rocky Mountain, Sequoia/Kings Canyon, and Shenandoah NPs were included in Figures 5 and 6.

    *Theodore Roosevelt and Virgin Islands NPs were not included in Table 1 because they were not in operation in 1997.

 

 

         Two summation methods have been used to describe how cumulative ozone exposure relates to effects on vegetation during the growing-season, May through September. The SUM60 statistic is a sum of all hourly ozone concentrations equal to or exceeding 60 parts per billion (ppb). A second method called W126 is a sum of all hourly ozone concentrations where the concentration is weighted by a function that gives a greater emphasis to concentrations above 60 ppb.

 

        The following graphs shows the SUM60 and W126 statistics for each of the PRIMENet sites during the 1997 growing-season. Only one year of data is presented because the operation dates of each monitor were highly variable and these indices are difficult to average in a meaningful way. The disadvantage of presenting one year of data is that inter-annual variation is ignored. However, these spatial patterns tend to remain consistent from year to year.

        Ozone injury to sensitive vegetation can occur above 25 ppm-hr for a three-month average of SUM60 and has been documented in Sequoia/Kings Canyon, Great Smoky Mountains, and Shenandoah NPS. These parks are likely to exceed the new 8-hour National Ambient Air Quality Standard (NAAQS) which is subject to court remand. The standard is based on human health effects and is set at 80 ppb ozone averaged over three years. Parks with large elevation gradients are particularly susceptible to ozone exposure. High elevation sites report 2-3 times more ozone than low elevations. This is illustrated by the two sites in Great Smoky Mountains NP, where the difference between Cades Cove (CC) at 564 m and Cove Mountain (CM) at 1243 m is a SUM60 factor of four. Ozone exposure at Olympic, Glacier, Denali, and Everglades NPs was very low in 1997.

 

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