NEWS

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CDSim 0.1.2 (2026-04-22)

Major improvements

• Revised climate simulation engine (simulate_climate_series()):
  • Replaced the previous implementation with a more physically consistent stochastic framework.
  • Improved representation of seasonality, temporal persistence (AR(1)), and long-term trends.
  • Introduced bounded temperature generation using truncated normal (Tmin) and gamma-based perturbation (Tmax).
  • Enhanced rainfall modelling using a first-order Markov chain for occurrence and gamma-distributed intensity.
  • Added rainfall–temperature coupling, ensuring realistic negative dependence between precipitation and maximum temperature.
  • Enforced diurnal consistency constraint (Tmax > Tmin) after rounding.

Enhancements

• Improved statistical realism of simulated outputs:

  • More realistic skewness in rainfall distributions.
  • Better alignment of autocorrelation structure with climatological expectations.
  • Strengthened cross-variable relationships (temperature–rainfall coupling).

• Updated internal validation workflow:

  • validate_climate_internal() now performs more robust checks on:
    • physical constraints
    • distributional properties
    • temporal autocorrelation
    • trend behavior
    • seasonal patterns