Relationship between wind speed and relative humidity

relationship between wind speed and relative humidity

Effects of Air Temperature, Relative Humidity, and Wind Speed on . H.M., and Harlock, S.C., A Correlation Between Test Methods Used to. Microwave-derived relationships between precipitation and wind speed . The SSM/I wind speed data and the column relative humidity data were averaged. ity, precipitation, wind speed and solar radiation. there is a positive correlation between IGF-I levels and energy and/or protein balance.

As the wind blows, it sweeps away airborne water particles that are in the air. The humidity of the air in the region of this evaporation is reduced, which allows more water molecules to dissipate into the air. Wind can also change the vapor pressure by moving air about rapidly, thereby causing it to expand.

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This process creates room for extra water vapor and evaporation will continue to occur while the wind is blowing. Relative Humidity Relative humidity refers to the amount of water in the air, as a fraction of the total amount the air can hold, when it is saturated. Once the air reaches percent relative humidity, it is no longer able to hold water, which then condenses out of the atmosphere.

Relative Humidity, Temperature & Pressure tutorial

The amount of humidity in the air directly affects the speed at which water will evaporate. The apparent differences are due to the fact that the data used to calibrate both models where recorded under hurricane conditions and therefore standard atmospheric pressure is extrapolated information.

First we will test the relationship between wind speed and pressure assuming interaction and then with the full second order model. Consider the augmented model including interaction without second order terms: Using the developed non-response analysis, we have to be: This gives a scaled model in terms of the smallest coefficient of Where the parameter estimates are given in Table 3.

The parameter estimates are given in Table 3 ; with Solving for pressure we have: As indicated in Fig.

Effect of Wind Speed and Relative Humidity on Atmospheric Dust Concentrations in Semi-Arid Climates

However, there is a smaller standard error, this is an indication of higher order terms in at least one of the principle factors to explain the curvature seen in the residuals Fig. Full second order model: Consider the augmented model: Scatter plot of pressure versus wind speed including developed model including interaction Using this non-response analysis, we have to be: Residual plot of a pressure and b wind speed Solving for pressure we have: The apparent reason for the two solutions is that pressures relationship to wind speed is indirectly related by temperature and volume and therefore, the pressure would be different before, during and after a storm.

Scatter plot of pressure versus wind speed including developed model including higher order terms and interaction This is seen in the estimates when we let: This is an indication that there are lurking variables, either volume not measured or temperatures not provided in this data set are related to pressure and wind speed.

This breakdown is consistent with the Wooten and Tsokos b scale, that around 80 knots there is a shift in pressure differentials and the start of hurricane category 2 in this newly defined scale. Scatter plot of pressure versus wind speed a before the storm and b after the storm Table 4: Standard scores for wind speedpressure, temperatures atmospheric, water and dew point for a the original data and b for the day moving average In the Saffir-Simpson scale, this shift occurs at 85 knots. As these values vary from hour to hour and have daily and yearly patterns, Fig.

relationship between wind speed and relative humidity

To compare these measures near the surface to those measured within a hurricane; consider the non-response model given in Eq. Using this non-response analysis and the raw data, we have to be: Solving for pressure in terms of wind speedwe have Hence, solving for pressure as it has been done in the previous analysis, Eq.

Why Does Humidity & Wind Speed Affect Evaporation? | Sciencing

However, as the wind speed increase, this estimate has increase variance. Figure 8 indicates that there is more to the relationship between pressure and wind speed near the surface of the water in the Gulf of Mexico. This is seen in that the estimates for pressure are only accurate during the summer months when temperatures are higher.

However, in the winter months, the developed model does not accurate estimate the observed pressure. This is due to the affects of temperature.

By the ideal gas law, pressure and volume are directly related to temperature, but under the assumption that pressure is constant, by Charles Law Pidwirny,here the ratio of volume to temperature is constant. Therefore, during the summer months when pressures appear to be constant, temperature should explain the interaction between pressure and volumes. To compare the behavior of each of the various temperatures and related volumes by scaling the data as follows: Among the variables given, pressure appears to be most constant; in addition, the behaviors of the three temperature readings are very similar.

relationship between wind speed and relative humidity

This is seen in Fig. This water layer interferes with interparticle forces: This effect was found to be the controlling factor in emission experiments performed with various types of sand in a wind tunnel set up by Ravi et al. However, in the same range of relative humidity, the water layer might increase cohesion in which case an increase in threshold velocity with relative humidity is observed. This type of effect was reported by Neuman and Sanderson in wind tunnel experiments with simulated soils made up of approximately monodisperse sand and glass beads.

The opposite effects of an adsorbed single water layer and a multilayer liquid film suggest that dust emission is not completely determined by ambient humidity and wind speeds, but other factors that affect particle cohesion, such as surface roughness and chemical composition, might play an important role in low humidity environments.

Effect of Wind Speed and Relative Humidity on Atmospheric Dust Concentrations in Semi-Arid Climates

In this regime, an increase in relative humidity leads to an increase in threshold friction velocity. Changes in the threshold velocity lead to changes in dust emission fluxes and, consequently, atmospheric particulate concentrations.

relationship between wind speed and relative humidity

In this study, we examine dust events in two semi-arid sites: During the spring months of March — May, dust storms are a common occurrence in these locations. We hypothesize that both wind speed and relative humidity may play an important role in observed atmospheric dust concentrations.

In particular, the effect of relative humidity on dust emission rates should have a bearing on atmospheric dust.

Materials and Methods 2. Green Valley Study Green Valley lat.