© Crown copyright Met Office Climate Projections for West Africa Andrew Hartley, Met Office: PARCC national workshop on climate information and species.

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Presentation transcript:

© Crown copyright Met Office Climate Projections for West Africa Andrew Hartley, Met Office: PARCC national workshop on climate information and species vulnerability to Climate Change, April 3-5, 2013

© Crown copyright Met Office Objectives for this morning 1.Summarise West African climate 2.Learn about Regional Downscaling 3.Understand results from the African RCM 4.Practical session on extracting and analysing results

© Crown copyright Met Office The West African Climate

© Crown copyright Met Office Main drivers of the West African Climate Seasonal shift in the Inter-Tropical Convergence Zone Sea Surface Temperatures in Gulf of Guinea Connected to Asian monsoon and pacific warm pool El Nino Land use

© Crown copyright Met Office West African Monsoon

© Crown copyright Met Office West African Monsoon

© Crown copyright Met Office Local land use Garcia-Carreras, L., et al (2010). Impact of mesoscale vegetation heterogeneities on the dynamical and thermodynamic properties of the planetary boundary layer. Journal of Geophysical Research, 115

© Crown copyright Met Office Regional Downscaling

From global to local climate …. … from a GCM grid to the point of interest.

© Crown copyright Met Office Main reason: GCM lack regional details due to coarse resolution for many climate studies -> needs fine scale information to be derived from GCM output. Smaller scale climate results from an interaction between global climate and local physiographic details There is an increasing need to better understand the processes that determine regional climate Impact assessors need regional detail to assess vulnerability and possible adaptation strategies Why downscaling?

What is a Regional Climate Model? Comprehensive physical high resolution climate model that covers a limited area of the globe Includes the atmosphere and land surface components of the climate system (at least) Contains representations of the important processes within the climate system e.g. clouds, radiation, precipitation

© Crown copyright Met Office Lateral boundary conditions LBCs = Meteorological boundary conditions at the lateral (side) boundaries of the RCM domain They constrain the RCM throughout its simulation Provide the information the RCM needs from outside its domain Data come from a GCM or observations Lateral boundary condition variables Wind Temperature Water Pressure Aerosols LBC variables

© Crown copyright Met Office Added value of RCMs

© Crown copyright Met Office RCMs simulate current climate more realistically Patterns of present-day winter precipitation over Great Britain

© Crown copyright Met Office Represent smaller islands Projected changes in summer surface air temperature between present day and the end of the 21st century.

© Crown copyright Met Office Predict climate change with more detail Projected changes in winter precipitation between now and 2080s.

© Crown copyright Met Office Simulate and predict changes in extremes more realistically Frequency of winter days over the Alps with different daily rainfall thresholds.

© Crown copyright Met Office Simulate cyclones and hurricanes A tropical cyclone is evident in the RCM (right) but not in the GCM

© Crown copyright Met Office Africa RCM The modeling process

© Crown copyright Met Office Africa CORDEX domain

© Crown copyright Met Office Model Setup December 1949 to December km spatial resolution PRECIS RCM with MOSES 2.2 land surface A1B scenario African Great Lakes included

© Crown copyright Met Office Ensemble approach Aim: Quantify uncertainty deriving from GCMs in regional climate projections QUMP: Quantification of Uncertainty of Model Projections 17 GCM ensemble members, each with different model setup Sub-selected 5 GCMs to provide LBCs for 5 different RCMs. Model selection based on regional analysis of GCMs for Africa. spread in outcomes produced by the full ensemble excluding any members that do not realistically represent the African climate.

© Crown copyright Met Office Boundary condition selection

© Crown copyright Met Office Validation using observations DatasetVariables usedResolutionSourceReference CRU m Temperature0.5° monthly, land onlyGridded station data Mitchell and Jones 2005 ERA40850hPa Winds2.5° monthly ReanalysisUppala et al, 2005 CMAPPrecipitation2.5° monthly Gridded station data merged with satellite data Xie and Arkin, 1997

© Crown copyright Met Office GCM Validation No clear ‘better’ or ‘worse’ models across all sub-regions Models generally capture timing and location of rainfall well, but magnitudes vary Sensitivity of models and their biases are not independent E.g. Q1-5 are coolest, and driest Stages 1 and 2 not independent! But, wanted to ‘avoid’ model Q1,3,4 and 16 as did not capture seasonal cycles well for one or more sub-regions.

© Crown copyright Met Office Monsoon Precipitation Based on CMAP observations June to Sep period All models do reasonably well to predict the extent of the monsoon Q1,3,4 and 5 under estimate rainfall amount Q6, 9, 12, 14, 15, and 16 slightly over estimate rainfall

© Crown copyright Met Office Winds and surface pressure Based on ERA40 reanalysis

© Crown copyright Met Office Comparison to other GCMs

© Crown copyright Met Office Comparison to other RCMs

© Crown copyright Met Office Sub-selection Q0, Q2, Q9, Q13, Q14 Q0 – unperturbed model Q2 and Q0 represent cooler end of range of responses Q13 and 14 represent warmer range of responses Q9 and 14 represent wetter end of range of responses Q0 and 2 represent drier end of responses (although this varies seasonally)

© Crown copyright Met Office Main points Large scale geographical distribution of the temperature and precipitation of the African climate are captured The sample captures full range of outcomes produced by the QUMP ensemble and the annual variation for as many of the sub-regions as possible. Q0 and Q2 represent the cooler end of the range of future projections and Q13 and Q14 represent the warmer end of the range to provide the spread in temperature. No particular model consistently shows the largest change in precipitation for both regions throughout the year. Q14 represents the wetter end of the range in future projections for Western Tropical Africa during December, January and February (DJF) but not during June, July, August (JJA) and annually in West Sahel it is actually the driest model. Overall, the analysis suggests that Q0 captures the drier end of the range of future projections and Q9 captures the wetter end of the range.

© Crown copyright Met Office Key results for West Africa

© Crown copyright Met Office

Precipitation

© Crown copyright Met Office

Practical Session