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Probability Distribution of Relative Humidity and Surface of Nearly Assured Relative Humidity in Bangladesh.

Dr. Manotash Howlader
Senior Scientific Officer
Agricultural Statistics DivisionBRRI, Gazipur

Abstract/ Executive Summary:

This study was conducted with the objective to determine best fitted probability distribution for monthly humidity and construct surface of nearly assured monthly relative humidity in Bangladesh. Normal distribution and Beta distribution were compared as the probable candidates to identify the best fitted model for graduating the probability distribution of monthly average relative humidity (%) for the months from May to October during which most of the rainfall occurs in Bangladesh. These distribution were checked for 18 weather stations of Bangladesh Meteorological Department (BMD) where minimum 30 years daily relative humidity (%) data were available.

Keywords: Probability distribution, Relative Humidity, Monthly humidity.

Location: BRRI, Gazipur

Start Date: 30-06-2004

End Date: 30-07-2005

Program Area: Crop-Soil-Water Management

Commodity: Irrigation scheduling

Objectives:

To determine best fitted probability distribution for monthly humidity.
To construct surface of nearly assured monthly relative humidity in Bangladesh.

Methodology:

Normal distribution and Beta distribution were compared as the probable candidates to identify the best fitted model for graduating the probability distribution of monthly average relative humidity (%) for the months from May to October during which most of the rainfall occurs in Bangladesh. These distribution were checked for 18 weather stations of Bangladesh Meteorological Department (BMD) where minimum 30 years daily relative humidity (%) data were available. Goodness of fit was judged by x^2test. Selected the appropriate distribution, monthly average relative humidity with 90% were computed by solving the equation F(x,â,b,…) =90, where â,b,… are the estimates of parameters of the selected distribution. These estimates of relative humidity thus obtained were treated as nearly assured relative humidity. These estimated at 30 weather stations of BMD were then used to construct surface of nearly assured monthly relative humidity for the months from May to October. ARC view 2.1 spatial analyst was used to created the surface following Kriging interpolation module.

Source of Information: BRRI. Proceedings of the BRRI Annual Internal Review for 2004-2005 (Held on 18-22 December 2005). Bangladesh Rice Research Institute (BRRI). Gazipur -1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

i) Probability distribution of monthly relative humidity can fairly be graduated by Beta distribution in Bangladesh. ii) Surface maps for the nearly assured monthly relative humidity (i.e. minimum monthly relative humidity at 90% probability level) construction for each month from May to October than can be used to predict the nearly assured monthly relative at any location of Bangladesh.

Knowledge Management: Report/Proceedings