© CSIR 2007 www.csir.co.za Quasi- uniform C48 grid with resolution about 210 km Climate Modelling at the CSIR NRE NWP and RCM capacity build around the.

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© CSIR Quasi- uniform C48 grid with resolution about 210 km Climate Modelling at the CSIR NRE NWP and RCM capacity build around the conformal-cubic atmospheric model (CCAM) of the CSIRO A cube-based global model; semi-Lagrangian semi-implicit solution of the hydrostatic primitive equations Includes a wide range of physical parameterizations Developed by the CSIRO Marine and Atmospheric Research (McGregor, 2005) Runs in quasi-uniform or in stretched grid mode Multiscale forecasting...

© CSIR CRU 3.1 linear temperature trend Strong warming have occurred over the central parts of southern Africa, including the central interior of South Africa Warming more moderate along the coastal areas This analysis to be improved upon by using carefully designed homogeneous time series

© CSIR CCAM-GFDL20 simulated linear temperature trend Pattern correlation = 0.504

© CSIR CCAM-MIROC simulated linear temperature trend Pattern correlation = 0.555

© CSIR CCAM ens-ave projected change in summer half- year average maximum temperature for vs

© CSIR CCAM ensemble: projected change in annual rainfall (%) for vs Most models project a generally drier southern Africa, but wetter East Africa Cloud band (TTT) related rainfall signal over central South Africa

Impacts : water resources Projected streamflow change with climate change Increase No change/ decrease Increase No change/ decrease Streamflow Variability of streamflow ~ 2050 ~2100

What does this all mean for the Namakwa District? Rainfall variability very important over short term (next 10 to 20 years) – scientific advances relevant to Namakwa district are currently being made Medium term (up to 50 years) – temperature and rainfall trends are likely to adversely affect water, agriculture, health, human settlement sectors (but probably not tourism) Long term (> 50 years) – drier and warmer future will very likely have severe adverse effects on all the above, and on fisheries and biodiversity

What does this all mean for the Namakwa District? Short term responses (adaptation): – Water supply security assessed and measures to optimise water use, especially ground water – Strengthen disaster risk responses (esp. drought) Medium and long term response: – Urban planning to account for climatic trends – Renewable energy opportunities – Ecosystem based adaptation opportunities – Water supply enhancement opportunities – Assess high end risks and lobby for safe global temperature goal