earthkit.meteo.thermo.array.lcl_temperature
===========================================

.. py:function:: earthkit.meteo.thermo.array.lcl_temperature(t, td, method='davies')

   Compute the Lifting Condenstaion Level (LCL) temperature from dewpoint.

   :param t: Temperature at the start level (K)
   :type t: :class:`number` or :class:`array-like`
   :param td: Dewpoint at the start level (K)
   :type td: :class:`number` or :class:`array-like`
   :param method: The computation method: "davies" or "bolton".
   :type method: :class:`str`, *optional*

   :returns: Temperature of the LCL (K)
   :rtype: :class:`number` or :class:`array-like`

   The actual computation is based on the ``method``:

   * "davies": the formula by [DaviesJones1983]_ is used (it is also used by the IFS model):

       .. math::

           t_{LCL} =
           td - (0.212 + 1.571\times 10^{-3} (td - t_{0}) - 4.36\times 10^{-4} (t - t_{0})) (t - td)

     where :math:`t_{0}` is the triple point of water (see :data:`earthkit.meteo.constants.T0`).

   * "bolton": the formula by [Bolton1980]_ is used:

       .. math::

           t_{LCL} = 56.0 +  \frac{1}{\frac{1}{td - 56} + \frac{log(\frac{t}{td})}{800}}