investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the coastal west africa

نویسندگان

kpaikpai batebana

assistant lecturer, college of atmospheric sciences, nanjing university of information science and technology, nanjing, jiangsu, china bob alex ogwang

assistant lecturer, uganda national meteorological authority, kampala, uganda zin mie mie sein

assistant lecturer, department of meteorology and hydrology, myanmar faustin katchele ogou

assistant lecturer, college of atmospheric sciences, nanjing university of information science and technology, nanjing, jiangsu, china victor ongoma

چکیده

this study investigates the atmospheric circulation associated with extreme rainfall events over the coastal west africa. the rainfall data of this study were obtained from the global precipitation climatology centre (gpcc), spanning from 1981 to 2010. the atmospheric datasets were also obtained from the era-interim reanalysis. the study employed the z-index to categorize dry and wet years into seven distinct grades. the analyses focused on the summer monsoon rainfall season experienced in july to september (jas). the extreme drought years were identified to be 1982 and 1983, while extreme wet years were pointed out to be 1999 and 2007. the area of study was dominated by anomalous westerly moisture transport, characterized by convergence at low level during wet years. the major source of moisture over the study area is atlantic ocean. dry and wet years are characterized by positive and negative low-level geopotential height anomalies, respectively. although the results of this study do not give a diagnosis of the reported rainfall variability, the information herein can be useful in the monitoring and update of seasonal forecasts. accurate and reliable seasonal forecasting is beneficial in that it helps us minimize loss of lives and destruction of property.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Investigation of the atmospheric circulation anomalies associated with extreme rainfall events over the Coastal West Africa

This study investigates the atmospheric circulation associated with extreme rainfall events over the coastal West Africa. The rainfall data of this study were obtained from the Global Precipitation Climatology Centre (GPCC), spanning from 1981 to 2010. The atmospheric datasets were also obtained from the ERA-Interim reanalysis. The study employed the Z-Index to categorize dry and wet years into...

متن کامل

Influence of atmospheric circulation patterns on dust transport during Harmattan Period in West Africa

This study has used TOMS AI as well as the reanalysis dataset of thirty-four years (1979-2012) to investigate the influence of atmospheric circulation on dust transport during the Harmattan period in West Africa, using Aerosol Index (AI) data, obtained from various satellite sensors. Changes in Inter-Tropical Discontinuity (ITD), Sea Surface Temperature (SST) over the Gulf of Guinea, and North ...

متن کامل

Tropical south east Atlantic warm events and associated rainfall anomalies over southern Africa

Moisture flux and rainfall anomalies over southern Africa that have occurred during strong warm SST events off the coast of Angola since 1950 are considered. These events typically occur during February-April (FMA), the main rainy season for Angola/northern Namibia. Eleven of these events have occurred in this 60 year period and each experiences increased rainfall somewhere in coastal Angola, a...

متن کامل

Influence of atmospheric circulation patterns on dust transport during Harmattan Period in West Africa

This study has used TOMS AI as well as the reanalysis dataset of thirty-four years (1979-2012) to investigate the influence of atmospheric circulation on dust transport during the Harmattan period in West Africa, using Aerosol Index (AI) data, obtained from various satellite sensors. Changes in Inter-Tropical Discontinuity (ITD), Sea Surface Temperature (SST) over the Gulf of Guinea, and North ...

متن کامل

analysis of the jet streams frequency associated with extreme and pervasive precipitation over khazar western coastal

in this research, the frequency of the jet streams associated with extreme and pervasive precipitation has been analyzed using environmental to circulation approach. based on the 99th percentile index, 109 days of the extreme and pervasive precipitation was selected from the irimo data base ( including 33 synoptic, climatic and rain gage stations during 15992 days from farvardin, 1st, 1340 to d...

متن کامل

Intense Rainfall Events over the West coast of India

The west coast of the Indian peninsula receives very heavy rainfall during the summer monsoon (June-September) season with average rainfall over some parts exceeding 250 cm. Heavy rainfall events with rainfall more than 15 cm day −1 at one or more stations along the west coast of India occur frequently and cause considerable damage. out during the monsoon season of 2002 to study these events. T...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
فیزیک زمین و فضا

جلد ۴۱، شماره ۴، صفحات ۱۴۱-۱۴۹

کلمات کلیدی

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023