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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