Abstract
The Aerosols99 cruise took place during the period from January 14 to February 8, 1999, on the R/V Ronald Brown. The cruise track was almost a straight line in the southeast direction from Norfolk, Virginia, to Cape Town, South Africa, and afforded the opportunity to sample several different aerosol regimes over the North and South Atlantic. Handheld sunphotometers, a shadowband radiometer (FRSR), and a LIDAR were used to measure the aerosol optical depth (AOD) during the cruise. The AOD and angstrom exponent α (spectral dependence of the AOD) varied strongly between regimes. Maritime regions typically had AOD (500 nm) of approximately 0.10 ± 0.03, with α around 0.3 ± 0.3. An African dust event was encountered in which the AOD (500 nm) averaged 0.29 ± 0.05 with an α of 0.36 ± 0.13. At the Intertropical Convergence Zone (ITCZ), no measurements were obtained because of cloudiness; however, after the ITCZ we encountered a biomass burning aerosol with high average AOD (500 nm) of 0.36 ± 0.13, and a high α (0.88 ± 0.30). Farther south the aerosol went back to the low levels of a typical marine aerosol.
| Original language | English (US) |
|---|---|
| Article number | 2000JD900783 |
| Pages (from-to) | 20811-20819 |
| Number of pages | 9 |
| Journal | Journal of Geophysical Research C: Oceans |
| Volume | 106 |
| Issue number | D18 |
| State | Published - Sep 27 2001 |
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ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
- Atmospheric Science
- Astronomy and Astrophysics
- Oceanography
Cite this
Aerosol optical depth measurements during the Aerosols99 experiment. / Voss, Kenneth; Welton, Ellsworth J.; Quinn, Patricia K.; Frouin, Robert; Miller, Mark; Reynolds, R. Michael.
In: Journal of Geophysical Research C: Oceans, Vol. 106, No. D18, 2000JD900783, 27.09.2001, p. 20811-20819.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Aerosol optical depth measurements during the Aerosols99 experiment
AU - Voss, Kenneth
AU - Welton, Ellsworth J.
AU - Quinn, Patricia K.
AU - Frouin, Robert
AU - Miller, Mark
AU - Reynolds, R. Michael
PY - 2001/9/27
Y1 - 2001/9/27
N2 - The Aerosols99 cruise took place during the period from January 14 to February 8, 1999, on the R/V Ronald Brown. The cruise track was almost a straight line in the southeast direction from Norfolk, Virginia, to Cape Town, South Africa, and afforded the opportunity to sample several different aerosol regimes over the North and South Atlantic. Handheld sunphotometers, a shadowband radiometer (FRSR), and a LIDAR were used to measure the aerosol optical depth (AOD) during the cruise. The AOD and angstrom exponent α (spectral dependence of the AOD) varied strongly between regimes. Maritime regions typically had AOD (500 nm) of approximately 0.10 ± 0.03, with α around 0.3 ± 0.3. An African dust event was encountered in which the AOD (500 nm) averaged 0.29 ± 0.05 with an α of 0.36 ± 0.13. At the Intertropical Convergence Zone (ITCZ), no measurements were obtained because of cloudiness; however, after the ITCZ we encountered a biomass burning aerosol with high average AOD (500 nm) of 0.36 ± 0.13, and a high α (0.88 ± 0.30). Farther south the aerosol went back to the low levels of a typical marine aerosol.
AB - The Aerosols99 cruise took place during the period from January 14 to February 8, 1999, on the R/V Ronald Brown. The cruise track was almost a straight line in the southeast direction from Norfolk, Virginia, to Cape Town, South Africa, and afforded the opportunity to sample several different aerosol regimes over the North and South Atlantic. Handheld sunphotometers, a shadowband radiometer (FRSR), and a LIDAR were used to measure the aerosol optical depth (AOD) during the cruise. The AOD and angstrom exponent α (spectral dependence of the AOD) varied strongly between regimes. Maritime regions typically had AOD (500 nm) of approximately 0.10 ± 0.03, with α around 0.3 ± 0.3. An African dust event was encountered in which the AOD (500 nm) averaged 0.29 ± 0.05 with an α of 0.36 ± 0.13. At the Intertropical Convergence Zone (ITCZ), no measurements were obtained because of cloudiness; however, after the ITCZ we encountered a biomass burning aerosol with high average AOD (500 nm) of 0.36 ± 0.13, and a high α (0.88 ± 0.30). Farther south the aerosol went back to the low levels of a typical marine aerosol.
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M3 - Article
VL - 106
SP - 20811
EP - 20819
JO - Journal of Geophysical Research: Oceans
JF - Journal of Geophysical Research: Oceans
SN - 2169-9275
IS - D18
M1 - 2000JD900783
ER -