Volume 49, Issue 1, June 2020, Pages 75–88
Bakary Bamba1, Eric-pascal Zahiri2, Modeste Kacou3, Abé Delfin Ochou4, Yves Kouassi Kouadio5, Ibrahima Bamba6, and Augustin Kadjo Koffi7
1 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
2 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
3 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
4 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
5 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
6 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
7 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
Original language: English
Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
A seasonal variability study of tropical raindrop size distributions (DSD) and integrated rain parameters in West Africa coastal area (Abidjan, Côte d’Ivoire) was done. The study covered the period 1986 to 1988 with a focus on 1987 for a complete annual cycle investigation using the EPSAT validation experiment data. The following parameters have been described: the median volume diameter (D0), the total number of drops per unit volume of air (NT), the ratio D0/NT, the rain rate (R) as well as the radar reflectivity factor (Z). During the May-June (MJ) and September-October-November (SON) seasons, the characteristics of DSD in June 1987 (D0 strong and NT low) compared to those of October 1987 (D0 strong and NT strong) could explain the high rainfall recorded during SON compared to MJ where the rainfall is lower. The Sea Surface Temperature (SST) analysis of these two seasons indicate a modulation of this inversion by ocean surface conditions. In general, a high SST induces important rain with spectra containing a large number of large drops due to strong convection associated with a large advection flow. Finally, raindrop size distributions appeared to be relevant indicators to characterize the specific behaviour of the rainy seasons.
Author Keywords: Raindrop size distributions, Sea Surface Temperature, Rainy seasons, Rainfall, Coastal area, Convection, Advection flow.
Bakary Bamba1, Eric-pascal Zahiri2, Modeste Kacou3, Abé Delfin Ochou4, Yves Kouassi Kouadio5, Ibrahima Bamba6, and Augustin Kadjo Koffi7
1 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
2 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
3 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
4 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
5 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
6 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
7 Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
Original language: English
Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
A seasonal variability study of tropical raindrop size distributions (DSD) and integrated rain parameters in West Africa coastal area (Abidjan, Côte d’Ivoire) was done. The study covered the period 1986 to 1988 with a focus on 1987 for a complete annual cycle investigation using the EPSAT validation experiment data. The following parameters have been described: the median volume diameter (D0), the total number of drops per unit volume of air (NT), the ratio D0/NT, the rain rate (R) as well as the radar reflectivity factor (Z). During the May-June (MJ) and September-October-November (SON) seasons, the characteristics of DSD in June 1987 (D0 strong and NT low) compared to those of October 1987 (D0 strong and NT strong) could explain the high rainfall recorded during SON compared to MJ where the rainfall is lower. The Sea Surface Temperature (SST) analysis of these two seasons indicate a modulation of this inversion by ocean surface conditions. In general, a high SST induces important rain with spectra containing a large number of large drops due to strong convection associated with a large advection flow. Finally, raindrop size distributions appeared to be relevant indicators to characterize the specific behaviour of the rainy seasons.
Author Keywords: Raindrop size distributions, Sea Surface Temperature, Rainy seasons, Rainfall, Coastal area, Convection, Advection flow.
How to Cite this Article
Bakary Bamba, Eric-pascal Zahiri, Modeste Kacou, Abé Delfin Ochou, Yves Kouassi Kouadio, Ibrahima Bamba, and Augustin Kadjo Koffi, “Seasonal variability of raindrop size distributions characteristics regarding to climatic parameters over coastal area of West Africa,” International Journal of Innovation and Scientific Research, vol. 49, no. 1, pp. 75–88, June 2020.
