FN Archimer Export Format
PT J
TI North-south cross sections of the vertical aerosol distribution over the Atlantic Ocean from multiwavelength Raman/polarization lidar during Polarstern cruises
BT 
AF KANITZ, T.
   ANSMANN, A.
   ENGELMANN, R.
   ALTHAUSEN, D.
AS 1:1;2:1;3:1;4:1;
FF 1:;2:;3:;4:;
C1 Leibniz Inst Tropospher Res, D-04318 Leipzig, Germany.
C2 LEIBNIZ INST TROPOSPHER RES (TROPOS), GERMANY
IF 3.454
TC 47
UR https://archimer.ifremer.fr/doc/00291/40183/39043.pdf
LA English
DT Article
CR ET LIDAR
   MA_LIDAR_PENMARCH_2011
BO Marion Dufresne
   Unknown
AB Shipborne aerosol lidar observations were performed aboard the research vessel Polarstern in 2009 and 2010 during three north-south cruises from about 50 degrees N to 50 degrees S. The aerosol data set provides an excellent opportunity to characterize and contrast the vertical aerosol distribution over the Atlantic Ocean in the polluted northern and relatively clean southern hemisphere. Three case studies, an observed pure Saharan dust plume, a Patagonian dust plume east of South America, and a case of a mixed dust/smoke plume west of Central Africa are exemplarily shown and discussed by means of their optical properties. The meridional transatlantic cruises were used to determine the latitudinal cross section of the aerosol optical thickness (AOT). Profiles of particle backscatter and extinction coefficients are presented as mean profiles for latitudinal belts to contrast northern-and southern-hemispheric aerosol loads and optical effects. Results of lidar observations at Punta Arenas (53 degrees S), Chile, and Stellenbosch (34 degrees S), South Africa, are shown and confirm the lower frequency of occurrence of free-tropospheric aerosol in the southern hemisphere than in the northern hemisphere. The maximum latitudinal mean AOT of 0.27 was found in the northern tropics (0-15 degrees N) in the Saharan outflow region. Marine AOT is typically 0.05 +/- 0.03. Particle optical properties are presented separately for the marine boundary layer and the free troposphere. Concerning the contrast between the anthropogenically influenced midlatitudinal aerosol conditions in the 30-60 degrees N belt and the respective belt in the southern hemisphere over the remote Atlantic, it is found that the AOT and extinction coefficients for the vertical column from 0-5 km (total aerosol column) and 1-5 km height (lofted aerosol above the marine boundary layer) are a factor of 1.6 and 2 higher at northern midlatitudes than at respective southern midlatitudes, and a factor of 2.5 higher than at the clean marine southern-hemispheric site of Punta Arenas. The strong contrast is confined to the lowermost 3 km of the atmosphere.
PY 2013
PD MAR
SO Journal Of Geophysical Research-atmospheres
SN 2169-897X
PU Amer Geophysical Union
VL 118
IS 6
UT 000317843200015
BP 2643
EP 2655
DI 10.1002/jgrd.50273
ID 40183
ER

EF