Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements
Dual-wavelength Raman and depolarization lidar observations were performed during the Saharan Aerosol Long-range Transport and Aerosol-Cloud interaction Experiment in Barbados in June and July 2013 to characterize the optical properties and vertical distribution of long-range transported Saharan dus...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-10-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/11067/2015/acp-15-11067-2015.pdf |
| _version_ | 1819200368864657408 |
|---|---|
| author | S. Groß V. Freudenthaler K. Schepanski C. Toledano A. Schäfler A. Ansmann B. Weinzierl |
| author_facet | S. Groß V. Freudenthaler K. Schepanski C. Toledano A. Schäfler A. Ansmann B. Weinzierl |
| author_sort | S. Groß |
| collection | DOAJ |
| description | Dual-wavelength Raman and depolarization lidar observations were performed
during the Saharan Aerosol Long-range Transport and Aerosol-Cloud interaction
Experiment in Barbados in June and July 2013 to characterize the optical
properties and vertical distribution of long-range transported Saharan dust
after transport across the Atlantic Ocean. Four major dust events were
studied during the measurements from 15 June to 13 July 2013 with aerosol
optical depths at 532 nm of up to 0.6. The vertical aerosol distribution was
characterized by a three-layer structure consisting of the boundary layer,
the entrainment or mixing layer and the pure Saharan dust layer. The upper
boundary of the pure dust layer reached up to 4.5 km in height. The
contribution of the pure dust layer was about half of the total aerosol
optical depth at 532 nm. The total dust contribution was about 50–70 %
of the total aerosol optical depth at 532 nm. The lidar ratio within the
pure dust layer was found to be wavelength independent with mean values of
53 ± 5 sr at 355 nm and 56 ± 7 sr at 532 nm. For the particle
linear depolarization ratio, wavelength-independent mean values of
0.26 ± 0.03 at 355 nm and 0.27 ± 0.01 at 532 nm have
been found. |
| first_indexed | 2024-12-23T03:31:08Z |
| format | Article |
| id | doaj.art-d4617b5f851c4ec583b291ed38fcf543 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-23T03:31:08Z |
| publishDate | 2015-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-d4617b5f851c4ec583b291ed38fcf5432022-12-21T18:01:42ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242015-10-011519110671108010.5194/acp-15-11067-2015Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurementsS. Groß0V. Freudenthaler1K. Schepanski2C. Toledano3A. Schäfler4A. Ansmann5B. Weinzierl6Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyLudwig-Maximilians-Universität, Meteorologisches Institut, München, GermanyLeibniz-Institut für Troposphärenforschung (TROPOS), Leipzig, GermanyUniversitat de Valladolid, Valladolid, SpainDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyLeibniz-Institut für Troposphärenforschung (TROPOS), Leipzig, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDual-wavelength Raman and depolarization lidar observations were performed during the Saharan Aerosol Long-range Transport and Aerosol-Cloud interaction Experiment in Barbados in June and July 2013 to characterize the optical properties and vertical distribution of long-range transported Saharan dust after transport across the Atlantic Ocean. Four major dust events were studied during the measurements from 15 June to 13 July 2013 with aerosol optical depths at 532 nm of up to 0.6. The vertical aerosol distribution was characterized by a three-layer structure consisting of the boundary layer, the entrainment or mixing layer and the pure Saharan dust layer. The upper boundary of the pure dust layer reached up to 4.5 km in height. The contribution of the pure dust layer was about half of the total aerosol optical depth at 532 nm. The total dust contribution was about 50–70 % of the total aerosol optical depth at 532 nm. The lidar ratio within the pure dust layer was found to be wavelength independent with mean values of 53 ± 5 sr at 355 nm and 56 ± 7 sr at 532 nm. For the particle linear depolarization ratio, wavelength-independent mean values of 0.26 ± 0.03 at 355 nm and 0.27 ± 0.01 at 532 nm have been found.http://www.atmos-chem-phys.net/15/11067/2015/acp-15-11067-2015.pdf |
| spellingShingle | S. Groß V. Freudenthaler K. Schepanski C. Toledano A. Schäfler A. Ansmann B. Weinzierl Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements Atmospheric Chemistry and Physics |
| title | Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements |
| title_full | Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements |
| title_fullStr | Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements |
| title_full_unstemmed | Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements |
| title_short | Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements |
| title_sort | optical properties of long range transported saharan dust over barbados as measured by dual wavelength depolarization raman lidar measurements |
| url | http://www.atmos-chem-phys.net/15/11067/2015/acp-15-11067-2015.pdf |
| work_keys_str_mv | AT sgroß opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements AT vfreudenthaler opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements AT kschepanski opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements AT ctoledano opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements AT aschafler opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements AT aansmann opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements AT bweinzierl opticalpropertiesoflongrangetransportedsaharandustoverbarbadosasmeasuredbydualwavelengthdepolarizationramanlidarmeasurements |