Reference ecosystems used in tropical forest restoration lack the temporal dimension required to characterise a mature or intact vegetation community. Here we provide practical ‘palaeo-reference ecosystem’ for eastern Andean forests of Ecuador complement standard ‘reference approach. Pollen assemblages from sedimentary archives recovered Ecuadorian montane are binned into distinct time periods ...

We propose a novel approach for analysing time series using complex network theory. We identify the recurrence matrix (calculated from time series) with the adjacency matrix of a complex network and apply measures for the characterisation of complex networks to this recurrence matrix. By using the logistic map, we illustrate the potential of these complex network measures for the detection of d...

This paper considers a generalized model of [G. Skoulakis and R. J. Adler, Ann. Appl. Probab., 11 (2001), pp.488-543]. We show the existence of superprocesses in a random medium (flow) with location dependent branching. Technically, we make use of a duality relation to establish the uniqueness of the martingale problem and to obtain the moment formulas which generalize those of [G. Skoulakis an...

We consider the classical optimal dividend control problem which was proposed by de Finetti [Trans. XVth Internat. Congress Actuaries 2 (1957) 433–443]. Recently Avram, Palmowski and Pistorius [Ann. Appl. Probab. 17 (2007) 156–180] studied the case when the risk process is modeled by a general spectrally negative Lévy process. We draw upon their results and give sufficient conditions under whic...

In this paper we find the explicit solution of the equation A∗X + X∗A = B for linear bounded operators on Hilbert spaces, where X is the unknown operator. This solution is expressed in terms of the MoorePenrose inverse of the operator A. Thus, results of J. H. Hodges (Ann. Mat. Pura Appl. 44 (1957) 245–550) are extended to the infinite dimensional settings. Department of Mathematics, Faculty of...

A GFDL 3-D global generalized tracer field is adapted to provide a preliminary simulation of the reactive nitrogen (NOY) climatology in an unpolluted troposphere which has, as its sole source, downward transport of stratospheric NOY. The tracer field is scaled so that its downward cross-tropopause flux is balanced by the stratospheric production of NOY. While the model results show stratospheri...

This paper reports initial results from an Ozone Mapping and Profiler Suite (OMPS) Nadir Mapper cloud pressure and cloud fraction algorithm. The OMPS cloud products are intended for use in OMPS ozone or other tracegas algorithms. We developed the OMPS cloud products using a heritage algorithm developed for the Ozone Monitoring Instrument (OMI) on NASA’s Aura satellite. The cloud pressure algori...