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Sensitivity study of coastal plumes

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Acta Oceanologica Sinica 1999年第2期18卷 147-166页

作者： Wang Jia Mo Ruxi Gao Zhenhui Yin Zhongbin and Chen Mingjian 1. international arctic {2. center-Frontier, university of alaska fairbanks, Fairbanki, alaska 99775, usa. Email: jwang @ chukchi. iare. uaf. edu 2. Guangxi Marine Monitoring Forecast Cen Intl. arctic Res. center-Frontier University of Alaska Fairbanks Fairbanks AK 99775 United States Guangxi Mar. Monitoring Forecast C. South China Sea Branch State Oceanic Administration Beihai 536000 China Marine Monitoring Division North Sea Branch State Oceanic Administration Qingdao 266033 China Off. of Marine Monitoring Technology Hi-Tech R. and D. Program of China Beijing 100081 China State Oceanic Administration Beijing 100860 China

A three-dimensional numerical model of the coastal plume in an ideal basin for the western Gulf of Maine of usa, based on the observations, was configured to examine the dynamical properties under the spring riverine, tidal, and wind forcing. The purpose of this paper is to reveal possible effects of different factors on the coastal plume. The control run with a sloping bottom mimicking the western Gulf of Maine reproduced a southward advection speed of 14 km/d, consistent with the observed speed of 13.3 km/d. The plume evolutions due to the two typical wind forcing, upwelling favourable (wind from north) and downwelling favourable (wind from south). were simulated to explain the observations during the spring of 1993. A systematic sensitivity study was also conducted on the following themes: model parameters. dynamic processes, and topography effect.

关键词： Coastal plume three-dimensional model Gulf of Maine

THE INSTABILITY OF NON-HYDROSTATIC STRATIFIED FLOWS

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Journal of Hydrodynamics 1999年第4期11卷 39-44页

作者： Ren Jiou chun, Shen I fan, Tao Ming de Depatment of Mechanics and Engineering Science, Fudan university, Shanghai 2.0433, P.R.ChinaWang Jia international {2. research center, university of alaska fairbanks, P.O. 7572.0, fairbanks, ak 99775 72.0

In this study we concentrate on the perturbations of pressure and density caused by thermohaline and expect to discuss the instability of the primitive equations of stratified flows for non hydrostatic internal waves. Traditionally, under the assumption of hydrostatic pressure, the Lagrangian derivative of the vertical velocity is ignored and the vertical velocity can be computed by integrating the continuity equation. In the process of dense water formation, on the basis of a quasi non hydrostatic perturbation pressure, the time derivative of the vertical velocity and the Coriolis term in the vertical momentum equation are included. With non hydrostatic approach we obtain three typical forms of the instability with Synge′s theorem, Miles′ theorem and Howard′s semicircle theorem. With the non hydrostatic Synge′s theorem, the Coriolis acceleration appears while stratification exists. The non hydrostatic conclusions derived by Miles′ theorem and Howard′s semicircle theorem are the same as their hydrostatic counterparts.

关键词： non hydrostatic stratified instability

Recent advances in precipitation-bias correction and application

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research in Cold and Arid Regions 2009年第3期1卷 193-198页

作者： DaQing Yang 1, NingLian Wang 2. BaiSheng Ye 2. LiJuan Ma 3 1. Water and Environmental research center,{2., fairbanks, alaska 99775-5860, usa. 2. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China. 3. Laboratory for Climate Studies, China Meteorological Administration, Beijing 100081, China. Water and Environmental research center University of Alaska Fairbanks State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

Significant progresses have been made in recent years in precipitation data analyses at regional to global scales. This paper re-views and synthesizes recent advances in precipitation-bias corrections and applications in many countries and over the cold re-gions. The main objective of this review is to identify and examine gaps in regional and national precipitation-error analyses. This paper also discusses and recommends future research needs and directions. More effort and coordination are necessary in the determinations of precipitation biases on large regions across national borders. It is important to emphasize that bias cor-rections of precipitation measurements affect both water budget and energy balance calculations, particularly over the cold regions.

关键词： precipitation gauge measurement bias correction cold region