This paper presents findings from a 2-year field investigation of a dissolved hydrocarbon groundwater plume flowing towards a tidally and seasonally forced estuarine river system in Perth, Western Australia. Samples collected from transects of multiport wells along the riverbank and into the river, enabled mapping of the fine scale (0.5 m) vertical definition of the hydrocarbon plume and its lo...

Three-dimensional stellar modeling has enabled us to identify a deep-mixing mechanism that must operate in all low mass giants. This mixing process is not optional, and is driven by a molecular weight inversion created by the He(He,2p)He reaction. In this paper we characterize the behavior of this mixing, and study its impact on the envelope abundances. It not only eliminates the problem of He ...

We have computed new solar models using the same stellar evolution code as described in Charbonnel, Vauclair and Zahn (1992). This code, originating from Geneva, now includes the computation of element segregation for helium and 12 heavier isotopes. It may also include any type of mixing of the stellar gas, provided this mixing may be parametrized with an effective diffusion coefficient as a fu...

Observations of heavy elements in Red Giant stars clearly show that low-mass AGB stars can provide a nucleosynthesis site of the s-process. Stellar evolution models produced over the last years indicate that radiative burning of C between succeeding thermal pulses in low-mass AGB star models may indeed provide the neutrons for the s-process. However, although it seems clear that some mixing bet...

It is shown that appearance of inertial range of scales, adjacent to distributed chaos range, results in adiabatic invariance of an energy correlation integral for isotropic homogeneous turbulence and for buoyancy driven turbulence (with stable or unstable stratification, including Rayleigh-Taylor mixing zone). Power spectrum of velocity field for distributed chaos dominated by this adiabatic i...

Abstract The ocean response to wintertime sea-ice retreat is investigated in the coupled climate model HiGEM. We focus on marginal ice zone and adjacent waters of Nordic Seas, where air-sea temperature difference can be large during periods off-ice winds promoting high heat flux events. Both control transient ensembles are examined, which allows us isolate due from change. As edge retreats towa...