We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byDanielle Daniel
Modified over 4 years ago
© Crown copyright Met Office A New Radiative Time- stepping Scheme A short description of the time-stepping scheme test Peter Hill, 19 Feb 2008
© Crown copyright Met Office Motivation Transmissivity = Regions with low transmissivity Absorption predominantly due to a strong gaseous absorber Absorption by clouds, aerosols and weak absorbers has little effect. Regions with high transmissivity Absorption predominantly due to clouds Gaseous absorbers are all weak. Treatment of main gaseous absorber is computationally more expensive. Clouds change on much shorter time-scales than the concentration of gases.
© Crown copyright Met Office Idea Replace existing spectral file with two new files A slow file for treating strong gaseous absorption, called less frequently. A fast file for treating clouds and minor gases, called more frequently.
© Crown copyright Met Office NAE Diagnostics SW Heating Rates,1 August 09.00 In experiment, fast is called every 3 time-steps, while slow is called every 18, the operational calls radiation every 12 time- steps.
© Crown copyright Met Office NAE Diagnostics LW Heating Rates,1 August 09.00
© Crown copyright Met Office Questions and answers
71° Circolo a.s ° Circolo a.s
© Crown copyright 2006Page 1 CFMIP II sensitivity experiments Mark Webb (Met Office Hadley Centre) Johannes Quaas (MPI) Tomoo Ogura (NIES) With thanks.
Page 1© Crown copyright 2007 Initial tendencies of cloud regimes in the Met Office Unified Model Keith Williams and Malcolm Brooks Met Office, Hadley Centre.
© Crown copyright Met Office Towards understanding the mechanisms responsible for different cloud-climate responses in GCMs. Mark Webb, Adrian Lock (Met.
© Crown copyright Met Office EURO4M Work Package 2 (chiefly WP2.1) Richard Renshaw EURO4M GA1, De Bilt, April 14 th 2010.
© Crown copyright Met Office Met Office Experiences with Convection Permitting Models Humphrey Lean Reading, UK Nowcasting Workshop,
Quantifying sub-grid cloud structure and representing it GCMs
Urban Modelling 1 03/2003 © Crown copyright Urban Scale NWP with the Met Office's Unified Model Peter Clark Mesoscale Modelling Group Met Office Joint.
© Crown copyright Met Office DIAMET forecast products.
Cloud droplet activation schemes. Motivation Met Office: UM new microphysics (4a scheme), linked to aerosols via parameterisations. Also WRF uses similar.
© Crown copyright Met Office Cloudier Evaluating a new GCM prognostic cloud scheme using CRM data Cyril Morcrette, Reading University, 19 February 2008.
© Crown copyright Met Office Radiation Parametrisation Current development work with the UM James Manners, visit to Reading University on 19 th February.
© Crown copyright Met Office Initial assessment of ARIES continuum measurements Stuart Newman Imperial College, 16 December 2008.
© University of Reading Richard Allan Department of Meteorology, University of Reading Thanks to: Jim Haywood and Malcolm.
Links Between Clear-sky Radiation, Water Vapour and the Hydrological Cycle Richard P. Allan 1, Viju O. John 2 1 Environmental Systems Science Centre, University.
© University of Reading Radiative effects of persistent aircraft contrails: a case study Richard Allan Environmental Systems.
1 00/XXXX © Crown copyright Carol Roadnight, Peter Clark Met Office, JCMM Halliwell Representing convection in convective scale NWP models : An idealised.
The Amazing Spectral Line Begin. Table of Contents A light review Introduction to spectral lines What spectral lines can tell us.
1 00/XXXX © Crown copyright Apportioning climate change indicators between regional emitters Jason Lowe and Geoff Jenkins Hadley Centre for Climate Prediction.
© Crown copyright Met Office Met Office Unified Model I/O Server Paul Selwood.
© 2018 SlidePlayer.com Inc. All rights reserved.