AROME-WMED, a real-time mesoscale model designed for the HyMeX special observation periods
Summary: To support the instrument deployment during HyMeX, aiming at studying the high precipitation in the Mediterranean area, a dedicated version of the operational convective-scale AROME-France model was developed: the AROME-WMED model. This paper presents the main features of this numerical weather prediction system in terms of data assimilation and forecast. The forecast skill of the model is then assessed during the HyMeX special observation periods and compared to the operational AROME-France.
Geosci. Model Dev., 8, 1919-1941, doi:10.5194/gmd-8-1919-2015, 2015
Global sensitivity analysis, probabilistic calibration, and predictive assessment for the data assimilation linked ecosystem carbon model
Summary: In this paper we propose a probabilistic framework for an uncertainty quantification study of a carbon cycle model and focus on the comparison between steady-state and transient simulation setups. We study model parameters via global sensitivity analysis and employ a Bayesian approach to calibrate these parameters using NEE observations at the Harvard Forest site. The calibration results are then used to assess the predictive skill of the model via posterior predictive checks.
Geosci. Model Dev., 8, 1899-1918, doi:10.5194/gmd-8-1899-2015, 2015
Integration of prognostic aerosol–cloud interactions in a chemistry transport model coupled offline to a regional climate model
Summary: We have showed that a coupled modelling system is beneficial in the sense that more complex processes can be included to better represent the aerosol processes starting from their formation, their interactions with clouds and provide better estimate of radiative forcing. Using this model set up, we estimated an annual mean 'indirect' radiative forcing of -0.64W/m2. This means that aerosols, solely by their capability of altering the microphysical properties of clouds can cool the Earth system.
Geosci. Model Dev., 8, 1885-1898, doi:10.5194/gmd-8-1885-2015, 2015
NCIO 1.0: a simple Fortran NetCDF interface
Summary: Here we present a concise interface to the NetCDF library designed to simplify reading and writing tasks of up to 6-D arrays in Fortran programs.
Geosci. Model Dev., 8, 1877-1883, doi:10.5194/gmd-8-1877-2015, 2015
Development and application of the WRFPLUS-Chem online chemistry adjoint and WRFDA-Chem assimilation system
Summary: WRFPLUS-Chem is a coupled meteorology-chemistry adjoint and tangent linear model, with applications in sensitivity analysis and four-dimensional variational data assimilation. The linearized models are verified against finite difference approximations from the nonlinear forward model, WRF-Chem. A new checkpointing scheme enables data assimilation beyond 6h. New capabilities are demonstrated in an emission sensitivity study.
Geosci. Model Dev., 8, 1857-1876, doi:10.5194/gmd-8-1857-2015, 2015
Reaching the lower stratosphere: validating an extended vertical grid for COSMO
Summary: An extended vertical grid, which reaches the lower stratosphere, for the regional atmospheric model COSMO was developed. This extended vertical grid was used in model runs simulating almost a full year. The model output was then validated using temperature and relative humidity measurements taken from synoptic radiosondes. Using this extended vertical grid, the model was found to run stably and produce realistic values.
Geosci. Model Dev., 8, 1839-1855, doi:10.5194/gmd-8-1839-2015, 2015
Verifications of the high-resolution numerical model and polarization relations of atmospheric acoustic-gravity waves
Summary: We performed high-resolution numerical simulations of nonlinear acoustic-gravity waves (AGWs) at altitudes 0–500km and compared them with analytical polarization relations of linear AGW theory. After some transition time, t > te, the numbers of numerically simulated and analytical pairs of AGW parameters, which are equal to confidence 95%, are larger at altitudes 30-60km and are smaller at t < te. The differences reveal circumstances where numerical simulations of waves are required.
Geosci. Model Dev., 8, 1831-1838, doi:10.5194/gmd-8-1831-2015, 2015
simpleGAMMA v1.0 – a reduced model of secondary organic aerosol formation in the aqueous aerosol phase (aaSOA)
Geosci. Model Dev., 8, 1821-1829, doi:10.5194/gmd-8-1821-2015, 2015
An analytical verification test for numerically simulated convective flow above a thermally heterogeneous surface
Geosci. Model Dev., 8, 1809-1819, doi:10.5194/gmd-8-1809-2015, 2015
Representing life in the Earth system with soil microbial functional traits in the MIMICS model
Summary: Projecting biogeochemical responses to environmental change requires multi-scaled perspectives. However, microbes, the drivers of soil organic matter decomposition and stabilization, remain notably absent from models used to project carbon cycle–climate feedbacks. Here, we apply and evaluate representations of microbial functional diversity across scales and find that such representations may be critical to accurately project soil carbon dynamics in a changing world.
Geosci. Model Dev., 8, 1789-1808, doi:10.5194/gmd-8-1789-2015, 2015
ESP v2.0: enhanced method for exploring emission impacts of future scenarios in the United States – addressing spatial allocation
Summary: We present and demonstrate Version 2.0 of the Emission Scenario Projection (ESP) method. This method produces multi-decadal air pollutant emission projections suitable for air quality modeling. The method focuses on energy-related emissions, including those from the electric sector, buildings, industry and transportation. ESP v2.0 enhances ESP v1.0 by taking population growth, migration and land use change into consideration.
Geosci. Model Dev., 8, 1775-1787, doi:10.5194/gmd-8-1775-2015, 2015
Path-integral method for the source apportionment of photochemical pollutants
Summary: A new method is presented for allocating the anthropogenic part of a pollutant concentration to the sources responsible. The method requires integrating sensitivity coefficients over a range of emissions defined by an emission-control strategy. A simplified photochemical model is used to evaluate options for the numerical integration and the dependence of the source contributions on the control strategy. Results are presented for ozone, formaldehyde, nitrogen dioxide, and nitric acid.
Geosci. Model Dev., 8, 1763-1773, doi:10.5194/gmd-8-1763-2015, 2015
Finite-Element Sea Ice Model (FESIM), version 2
Summary: Unstructured meshes allow multi-resolution modeling of ocean dynamics. Sea ice models formulated on unstructured meshes are a necessary component of ocean models intended for climate studies. This work presents a description of a finite-element sea ice model which is used as a component of a finite-element sea ice ocean circulation model. The principles underlying its design can be of interest to other groups pursuing ocean modelling on unstructured meshes.
Geosci. Model Dev., 8, 1747-1761, doi:10.5194/gmd-8-1747-2015, 2015
A large-scale simulation model to assess karstic groundwater recharge over Europe and the Mediterranean
Summary: We present a new approach to assess karstic groundwater recharge over Europe and the Mediterranean. Cluster analysis is used to subdivide all karst regions into four typical karst landscapes and to simulate karst recharge with a process-based karst model. We estimate its parameters by a combination of a priori information and observations of soil moisture and evapotranspiration. Independent observations of recharge that present large-scale models significantly under-estimate karstic recharge.
Geosci. Model Dev., 8, 1729-1746, doi:10.5194/gmd-8-1729-2015, 2015
Improving the ISBACC land surface model simulation of water and carbon fluxes and stocks over the Amazon forest
Geosci. Model Dev., 8, 1709-1727, doi:10.5194/gmd-8-1709-2015, 2015
libcloudph++ 1.0: a single-moment bulk, double-moment bulk, and particle-based warm-rain microphysics library in C++
Summary: This paper introduces a free and open-source C++ library of algorithms for representing cloud microphysics in numerical models. In the current release, the library covers three warm-rain schemes: the single- and double-moment bulk schemes, and the particle-based scheme with Monte Carlo coalescence. The three schemes are intended for modelling frameworks of different dimensionalities and complexities ranging from parcel models to multi-dimensional cloud-resolving (e.g. large-eddy) simulations.
Geosci. Model Dev., 8, 1677-1707, doi:10.5194/gmd-8-1677-2015, 2015
ICON–ART 1.0 – a new online-coupled model system from the global to regional scale
Geosci. Model Dev., 8, 1659-1676, doi:10.5194/gmd-8-1659-2015, 2015
A spectral nudging method for the ACCESS1.3 atmospheric model
Summary: We describe a spectral nudging technique to constrain the large spatial structures of an atmospheric general circulation model (ACCESS1.3) towards an observational product (ERA-Interim). This has a number of applications for model development and scientific studies. This paper shows potential benefits of using the spectral nudging over the traditional Newtonian relaxation method.
Geosci. Model Dev., 8, 1645-1658, doi:10.5194/gmd-8-1645-2015, 2015
Vertical resolution dependence of gravity wave momentum flux simulated by an atmospheric general circulation model
Geosci. Model Dev., 8, 1637-1644, doi:10.5194/gmd-8-1637-2015, 2015
Mass-conserving subglacial hydrology in the Parallel Ice Sheet Model version 0.6
Summary: We describe and test a parallel 2-D subglacial hydrology model. Such a hydrology model describes the motion of liquid water, and its pressure, underneath ice sheets and glaciers. Model goals include conserving the mass of water and generating an estimate of the ice basal shear stress. This hydrology model describes the subglacier as a layer of till and linked cavities, but it does not include conduits.
Geosci. Model Dev., 8, 1613-1635, doi:10.5194/gmd-8-1613-2015, 2015