. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 1 T—T"T-~I 1". -i—r"-i—i i i—r 5 > l- 1-4 H H <Z 3 m 3 2 — 0 10 20 0 10 20 0 10 20 30 40 50 60 0 10 20 30 40 50 60 70 NSOLUBLE AEROSOL CONCENTRATION (xxg m"s) 80 Fig. 3. The vertical distribution of insoluble aerosol during each of the four Bomex periods. Each point represents the arithmetic average of all measurements made within 305-meter (1-kft) altitude intervals. The points lying off the smoothed distribution drawn for
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 1 T—T"T-~I 1". -i—r"-i—i i i—r 5 > l- 1-4 H H <Z 3 m 3 2 — 0 10 20 0 10 20 0 10 20 30 40 50 60 0 10 20 30 40 50 60 70 NSOLUBLE AEROSOL CONCENTRATION (xxg m"s) 80 Fig. 3. The vertical distribution of insoluble aerosol during each of the four Bomex periods. Each point represents the arithmetic average of all measurements made within 305-meter (1-kft) altitude intervals. The points lying off the smoothed distribution drawn for periods 3 and 4 are averages of only one or two measurements, whereas the adjacent points through which the line is drawn are averages of at least 21 measurements. The total number of meas- urements in each period were 180, 411, 221, and 552, respectively. The data in this figure and those following have not been corrected for filter efficiency or for the loss of volatile aerosol material during ashing. tained on shuttle flights between Barbados and Miami and a flight to Recife, Brazil; however, only data points between 10°N and 25°N were used from these flights. The average trade wind aerosol concentration during each of the four Bomex periods calcu- lated on the basis of the smoothed vertical dis- tributions shown in Figure 3 is: (1) 8 /xg m~3; (2) 13 /xg m"3; (3) 26 /xg m"3; (4) 25 /xg m"3. If we correct these data for a filter efficiency of 80% and a volatile aerosol weight loss of 10% at ignition, these averages become 11, 18, 36, and 35 /xg m"3, respectively. The increase in the insoluble aerosol concen- tration as the summer progresses is consistent with our long-term surface-air measurements, which show that the dust transport generally attains its maximum late in the summer [Pros- pero, 1968; Carlson and Prospero, 1972]. The increase is most dramatic between the altitudes of and km, the region that we identify as the Saharan air
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