MODELING OF ICE THERMODYNAMICS IN NATURAL-WATER BODIES

Citation
J. Launiainen et B. Cheng, MODELING OF ICE THERMODYNAMICS IN NATURAL-WATER BODIES, Cold regions science and technology, 27(3), 1998, pp. 153-178
Citations number
59
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary",Engineering,"Environmental Sciences
Journal title
ISSN journal
0165-232X
Volume
27
Issue
3
Year of publication
1998
Pages
153 - 178
Database
ISI
SICI code
0165-232X(1998)27:3<153:MOITIN>2.0.ZU;2-I
Abstract
A thermodynamic synoptic-scale sea-ice (freshwater lake) model was con structed for simulating ice thickness, ice temperature and air-ice int eraction. The model includes calculation of the air-ice interface temp erature and surface fluxes, as well as heat conduction in the snow and ice and heat flux and ice thickness variations at the ice-ocean bound ary. Attention was given to the parameterization of the various fluxes , especially the radiative fluxes and in the calculation of the turbul ent surface heat fluxes the effect of atmospheric stratification is ta ken into account. An iterative air-ice interface temperature serves as the key parameter controlling the surface heat balance, heat conducti on and ice thickness variation at the upper surface. A conservative in tegral difference scheme is used to solve the heat conduction equation for an ice column consisting of 10 to 30 layers, normally in the vert ical. In addition to thickness variations, the model yields the time d evelopment of the ice surface and in-ice temperatures and air-ice flux es. The model is also able to generate the near-surface atmospheric pr ofiles of wind, temperature and moisture. Model-calculated ice thickne ss and in-ice temperature variations were compared with observational data from the Bohai Sea and the Baltic Sea as a first step in verifyin g the model. Additionally, phenomenological process studies of subsurf ace melting and of the role of new snow above ice in spring is reporte d. The results indicate the atmospheric boundary layer (ABL) dynamical ly coupled with the ice and heat conduction in the ice as factors resp onsible for controlling ice growth, except under conditions of remarka ble heat fluxes from the ocean. In the spring, the role played by shor twave radiation in the surface heat balance and extinction in ice are of primary importance and control the melting. After validation, the m odel should be applicable and suitable for ice thermodynamics studies, for coupled air-ice-ocean models and even for climatic scenarios. (C) 1998 Elsevier Science B.V. All rights reserved.