Marshall-Palmer distribution

Using this, calculate the scavenging coefficient for the Marshall-Palmer distribution (17.108) (Marshall and Palmer 1948)... 

FIGURE 20.4 Time necessary for the removal of 50% of HNO.i(g) in a homogeneous atmosphere as a function of the rain intensity and the assumed minimum diameter in the Marshall-Palmer distribution used in the calculation. 

A multitude of measurements of drop-size spectra in rain have been made at the ground. These measurements indicate that drop-size distributions are of an approximately negative exponential form, especially in rain that is fairly steady. The so-called Marshall-Palmer distribution appears to describe the rain spectrum in most meteorological situations. This spectrum has the form... 

Probably the most widely used is the Marshall-Palmer (MP) distribution, where... 

TABLE 20.2 Scavenging Coefficients A(h for Below-Cloud Irreversible Scavenging of HNO3 Based on a Marshall-Palmer Raindrop Size Distribution... 

The reflectivity of rain, snow, fog, wind blown sand, etc. is given by Tj where Tj has units such as square meter per cubic meter. Here t] depends on the distribution of the particles (e.g., Marshall-Palmer). The radar resolution cell is given by... 

To calculate the scavenging coefficient A, we need to specify a raindrop size distribution n(Dp). A frequently used raindrop size distribution, as we saw in Chapter 15, is that of Marshall and Palmer (1948), (15.112),... 

Marshal JS, Palmer WM (1948) The distribution of rain-drops with size. J Atmos Sci 5 165-166 Mircea M, Stefan S, Fuzzi S (2000) Precipitation scavenging coefficient influence of measured aerosol and raindrop size distributions. Atmos Environ 34 5169-5174 Monte MJS, Santos LMNBF, Fulem M, Fonseca IMS, Sousa CAD (2006) New static apparatus and vapor pressure of reference materials naphthalene, benzoic acid, benzophenone, and ferrocene. J Chem Eng Data 51 757-766... 

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