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Table 3 Surface class (Delta, Lake, or Beach), disturbance class (Undisturbed or Disturbed), and mean and standard deviation of threshold friction velocity (u*t), friction velocity at which the NAAQS standard would be exceeded in a 30 m tall column of air (u*exc), friction velocity at which the maximum rate of PM10 vertical flux is observed (u*maxQ), the maximum rate of PM10 vertical flux observed (Max Q), and the total PM10 vertical flux for the nine minute PI-SWERL test (Tot Q) of each sample site

From: Dust emission source characterization for visibility hazard assessment on Lordsburg Playa in Southwestern New Mexico, USA

Site

Surf. Class

Disturb. Class

 

u*t (m s−1)

u*exc (m s−1)

u*maxQ (m s−1)

Max Q (μg m−2 s− 1)

Tot Q (μg m−2)

AD1

D

U

Mean

St. Dev.

0.31

0.02

0.80

0.02

0.81

0.00

1325.48

919.87

84,217

69,106

AD1

D

D

Mean

St. Dev.

0.31

0.02

0.62

0.07

0.81

0.01

11,030.94

5498.17

845,554

5,168,485

AD2

D

U

Mean

St. Dev.

0.26

0.05

0.74

0.12

0.80

0.02

3098.75

2021.42

193,221

131,854

AD3

D

U

Mean

St. Dev.

0.24

0.05

0.60

0.15

0.80

0.02

1248.26

8697.52

999,201

832,504

AD3

D

D

Mean

St. Dev.

0.31

0.02

0.50

0.03

0.68

0.05

24,977.63

1778.07

2,226,249

682,823

AD2

L

U

Mean

St. Dev.

0.31

0.01

--

--

0.80

0.00

223.60

36.49

16,733

2287

RFP

L

U

Mean

St. Dev.

0.36

0.06

--

--

0.81

0.00

476.06

406.79

45,648

77,958

PC

L

U

Mean

St. Dev.

0.56

0.10

0.81

--

0.80

0.02

561.84

717.75

36,857

49,034

RFP

B

U

Mean

St. Dev.

0.39

--

0.77

--

0.81

--

2450.36

--

288,993

--

EB

B

U

Mean

St. Dev.

0.30

0.10

0.72

0.08

0.81

0.00

7561.78

12,282.01

788,012

1,266,773

WB

B

U

Mean

St. Dev.

0.28

0.04

0.50

0.05

0.80

0.02

17,182.49

6844.97

2,727,300

1,084,141