Periodicity of Downward Longwave Radiation at an Equatorial Location
محل انتشار: مجله فیزیک زمین و فضا، دوره: 44، شماره: 4
سال انتشار: 1397
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 55
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شناسه ملی سند علمی:
JR_JESPHYS-44-4_013
تاریخ نمایه سازی: 26 مهر 1402
چکیده مقاله:
A good understanding of the diverse mechanisms in the atmosphere is required in modelling the climate. In this study, the diurnal and seasonal patterns of all-sky downward longwave radiation (DLR) at Ilorin (۸o ۳۲l N, ۴o ۳۴l E), Nigeria were investigated alongside relative humidity (RH) and temperature. The average diurnal pattern of DLR gives an arc that begins by increasing gradually with some inherent fluctuations from ۰۱:۰۰ hour to a maximum at ۱۴:۰۰ hour local time, and then gradually decreases to a minimum at ۰۰:۰۰ hour. However, sometimes erratic and double peak arc diurnal DLR patterns occur around the mid and the end of the year periods respectively. The seasonal, diurnal peak of temperature and the minimum of relative humidity (RH) occur approximately two hours after the peak of DLR. Besides, the seasonal trends of both DLR and RH match each other, except sometimes in June, which could be due to the midyear DLR erratic diurnal effect. Possibly, the mechanisms of the inter-tropical discontinuity (ITD) influence the particular diurnal patterns of DLR at the midyear and year-end periods. Moreover, monthly dispersion of DLR is high during known months of high atmospheric aerosols, and annual maximum temperature occurs after the Harmattan season. Hence, variations in DLR are influenced mostly by mineral dust in the atmosphere, mechanisms of ITD and changes in the sun-earth distance, which reflects on the different seasons in Ilorin.
کلیدواژه ها:
Downward longwave radiation (DLR) ، temperature ، relative humidity ، Inter-tropical discontinuity (ITD) ، Sun-earth distance
نویسندگان
Nsikan Obot
Ph.D. Graduated, Department of Physics, University of Lagos, Akoka, Lagos State, Nigeria
Ibifubara Humphrey
Ph.D. Graduated, Department of Physics, University of Lagos, Akoka, Lagos State, Nigeria
Michael Chendo
Professor, Department of Physics, University of Lagos, Akoka, Lagos State, Nigeria
Elijah Oyeyemi
Professor, Department of Physics, University of Lagos, Akoka, Lagos State, Nigeria
Sunday Udo
Professor, Department of Physics, University of Calabar, Calabar, Cross River State, Nigeria
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