scholarly journals A multi-moment transport model on cubed-sphere grid

2010 ◽  
Vol 67 (12) ◽  
pp. 1993-2014 ◽  
Author(s):  
C. G. Chen ◽  
F. Xiao ◽  
X. L. Li ◽  
Y. Yang
Keyword(s):  
Transport Model ◽  
Cubed Sphere

scholarly journals A Positivity-preserving Conservative Semi-Lagrangian Multi-moment Global Transport Model on the Cubed Sphere

2021 ◽  
Vol 38 (9) ◽  
pp. 1460-1473 ◽  
Author(s):  
Jie Tang ◽  
Chungang Chen ◽  
Xueshun Shen ◽  
Feng Xiao ◽  
Xingliang Li
Keyword(s):  
Single Cell ◽  
Rational Function ◽  
Finite Volume ◽  
Transport Model ◽  
Practical Implementation ◽  
Finite Volume Scheme ◽  
Courant Number ◽  
Positivity Preserving ◽  
Sphere Geometry ◽  
Cubed Sphere

AbstractA positivity-preserving conservative semi-Lagrangian transport model by multi-moment finite volume method has been developed on the cubed-sphere grid. Two kinds of moments (i.e., point values (PV moment) at cell interfaces and volume integrated average (VIA moment) value) are defined within a single cell. The PV moment is updated by a conventional semi-Lagrangian method, while the VIA moment is cast by the flux form formulation to assure the exact numerical conservation. Different from the spatial approximation used in the CSL2 (conservative semi-Lagrangian scheme with second order polynomial function) scheme, a monotonic rational function which can effectively remove non-physical oscillations is reconstructed within a single cell by the PV moments and VIA moment. To achieve exactly positive-definite preserving, two kinds of corrections are made on the original conservative semi-Lagrangian with rational function (CSLR) scheme. The resulting scheme is inherently conservative, non-negative, and allows a Courant number larger than one. Moreover, the spatial reconstruction can be performed within a single cell, which is very efficient and economical for practical implementation. In addition, a dimension-splitting approach coupled with multi-moment finite volume scheme is adopted on cubed-sphere geometry, which benefitsthe implementation of the 1D CSLR solver with large Courant number. The proposed model is evaluated by several widely used benchmark tests on cubed-sphere geometry. Numerical results show that the proposed transport model can effectively remove nonphysical oscillations and preserve the numerical non-negativity, and it has the potential to transport the tracers accurately in a real atmospheric model.

A non‐oscillatory multimoment finite‐volume global transport model on a cubed‐sphere grid using the WENO slope limiter

2018 ◽  
Vol 144 (714) ◽  
pp. 1611-1627 ◽  
Author(s):  
Jie Tang ◽  
Chungang Chen ◽  
Xingliang Li ◽  
Xueshun Shen ◽  
Feng Xiao
Keyword(s):  
Finite Volume ◽  
Transport Model ◽  
Global Transport ◽  
Slope Limiter ◽  
Cubed Sphere

A detailed contaminant transport model for facility hazard assessment in urban areas

1999 ◽  
Author(s):  
Bohdan Cybyk ◽  
Jay Boris ◽  
Theodore Young, Jr. ◽  
Charles Lind ◽  
Alexandra Landsberg
Keyword(s):  
Contaminant Transport ◽  
Hazard Assessment ◽  
Urban Areas ◽  
Transport Model

The Carbon:²³⁴Thorium ratios of sinking particles in the California Current Ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model

2019 ◽  
Author(s):  
Michael Stukel ◽  
Thomas Kelly
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Particulate Organic Carbon ◽  
Transport Model ◽  
California Current ◽  
In Situ Measurements ◽  
Power Law Distribution ◽  
Sinking Particles ◽  
Organic Carbon Concentration

Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon:thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U-234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking.

Effect of recent observations on Asian CO2 flux estimates by transport model inversions

Tellus B ◽  
2003 ◽  
Vol 55 (2) ◽  
pp. 522-529 ◽  
Author(s):  
Shamil Maksyutov ◽  
Toshinobu Machida ◽  
Hitoshi Mukai ◽  
Prabir K. Patra ◽  
Takakiyo Nakazawa ◽  
...  
Keyword(s):  
Transport Model ◽  
Co2 Flux
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