By Jan Grandell

About fifteen years in the past Henning Rodhe and that i disscussed the calculation of place of abode occasions, or lifetimes, of sure air toxins for the 1st time. He was once drawn to toxins which have been generally faraway from the ambience via precipitation scavenging. His proposal used to be to base the calculation on statistical types for the adaptation of the precipitation i~tensity and never in basic terms at the regular precipitation depth. so as to illustrate the significance of taking the adaptation into consideration we thought of an easy version - the following referred to as the Markov version - for the precipitation depth and computed the distribution of the place of abode time of an aerosol particle. Our expression for the typical place of abode time - the following formulation (13- was once fairly a lot utilized by meteorologists. definitely we have been happy, yet whereas our ambition were to supply an indication, our paintings used to be in basic terms understood as an offer for a pragmatic version. consequently we chanced on it common to go looking for extra normal versions. The mathematical difficulties concerned have been the starting place of my curiosity during this box. a quick define of the heritage, goal and content material of this paper is given in part 1. it's a excitement to thank Gunnar Englund, Georg Lindgren, Henning Rodhe and Michael Stein for his or her colossal assist in the pre paration of this paper and Iren Patricius for her advice in typing.

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**Sample text**

24), which illustrates the fact, mentioned becomes smoother when a becomes smaller. in section 7, that c(t) 57 Under general assumptions we have Co ~ YO/RO and rc(O)« a for small values of a and thus it seems natural to introduce the normalized and "time-transformed" process Then we have rc a (T) Define further and note that Var(ha(t)) = aVar(h(t/a)) + tr h as a + O. Consider now a variant of the Gibbs and Slinn approximation method and assume that the sink and the source are described by intensity models.

Since 1/RO is the first approximation for small values of a, that quantity seems to be the natural one to add to aE(W b ), and thus our approximation agrees with (62). Thus we have rediscovered (62) by a reasoning - certainly heuristic - where hardly anything is assumed about R(t). Note that dry and precipitation periods are not assume~ to be independent. In the mathematical remark in section 5 we discussed the interpretation of the word "typical". The critical part in our reasoning is that A(t) is assumed to be exactly zero in dry periods.

7. The figures indicate that it seems reasonable to assume Q(t) to be be stationary if E(T) is not too small and if Q(O) = O. Thus this illustration supports the discussion in section 3, but it must be kept in mind that the model considered here is very special and probably not too realistic. 31 Mathematical remark Let q(t) be any non-decreasing process with stationary increments such that E(q2(t)) < ~ • In order to formulate the general version of (26) we use the notation q{S+dT} = q(s + T) - q(s + T - dT) Mathematically q{o} is the random measure corresponding to q(o) and dT is interpreted as the stochastic process h - dT ,T].