[1] Stable nitrogen isotopic determination of particulate organic matter over the eastern North Atlantic in spring 2000 reveal a region of low natural abundance of N relative to N between 26 N and 32 N along 20 W. This light isotopic signal, together with phytopigment data and persistently elevated nitrate to phosphate ratios in the upper thermocline, suggest that nitrogen fixation provides a l...

Seasonal and inter-annual variations in Troposphere-to-Stratosphere Transport from the Tropical Tropopause Layer J. G. Levine, P. Braesicke, N. R. P. Harris, and J. A. Pyle Centre for Atmospheric Science, Dept. of Chemistry, Univ. of Cambridge, Cambridge, UK Atmospheric Chemistry Modelling Support Unit, National Centre for Atmospheric Science, University of Cambridge, Cambridge, UK European Ozo...

Anthropogenic emissions of nitrogen (N) to the atmosphere have been strongly increasing during the last century, leading to greater atmospheric N deposition to the oceans. The North Atlantic subtropical gyre (NASTG) is particularly impacted. Here, upwind sources of anthropogenic N from North American and European sources have raised atmospheric N deposition to rates comparable with N2 fixation ...

This contribution to the Spot-On volume considers the magnitude and composition of atmospheric nitrogen inputs to the oceans and then goes on to consider the impacts of these inputs. Effects in open ocean and coastal areas are probably different. Offshore atmospheric inputs may produce a small enhancement of overall ocean productivity and hence CO2 drawdown. In coastal waters atmospheric inputs...

The aim of the 2005-06 NKS-B NordRisk project has been to present practical methods for probabilistic risk assessment from long-range atmospheric transport and deposition of radioactive material. In this project an atlas of long-range atmospheric dispersion and deposition patterns derived from archived numerical weather prediction (NWP) model data coupled to an atmospheric dispersion model has ...

A quantitative analysis of grid-related systematic errors in oxidising capacity and ozone production rates in chemistry transport models J. G. Esler, G. J. Roelofs, M. O. Köhler, and F. M. O’Connor Department of Mathematics, University College London, UK Institute for Marine and Atmospheric research, Utrecht – IMAU, The Netherlands Centre for Atmospheric Science, University of Cambridge, Cambri...

determining those in the magnitude of LST changes over the wind farms. In addition, atmospheric stability determines the sign and strength of the net downward heat transport as well as the magnitude of the background TKE. The study highlights the need for better understanding of atmospheric boundary layer and wind farm interactions, and for better parameterizations of sub-grid scale turbulent m...

This issue addresses the present-day budget for anthropogenic CO 2 , and particularly the distribution and controlling factors of net terrestrial sinks for atmospheric CO 2 . The latter are of increasing political and economic importance under international CO2 mitigation agreements. Inverse modelling of meridional and zonal atmospheric, data(e.g. CO 2 , O 2, C), is one way to constrain terrest...

We describe the design of a parallel global atmospheric circulation model, PCCM2. This parallel model is functionally equivalent to the National Center for Atmospheric Research's Community Climate Model, CCM2, but is struc-tured to exploit distributed memory multicomputers. PCCM2 incorporates parallel spectral transform, semi-Lagrangian transport, and load balancing algorithms. We present detai...

CO2 flux history 1982–2001 inferred from atmospheric data using a global inversion of atmospheric transport C. Rödenbeck, S. Houweling, M. Gloor, and M. Heimann Max Planck Institute for Biogeochemistry, Postfach 10 01 64, D-07701 Jena, Germany National Institute for Space Research (SRON), Princetonplein 5, NL-3584 CC Utrecht, The Netherlands Received: 14 March 2003 – Accepted: 1 May 2003 – Publ...