Lakshminarayanapuram Ananthakrishnan Ramdas (3 June 1900 – 1 January 1979) was an Indian physicist and meteorologist, known for discovering the atmospheric phenomenon of the Ramdas layer or Lifted Temperature Minimum where the lowest temperature in the atmosphere is not on the ground but a few tens of centimeters above the ground resulting.

Ramdas was born in Palghat, Kerala and after his graduation he trained in physics and was a student of C. V. Raman as Palit Research Scholar from 1923 to 1926.

[3] His major work was on agricultural meteorology and began a project on "Weather in relation to crops" which was to become the "Agri Met" division of the IMD, among the earliest groups in the world to have such a specialization.

Ramdas devised a system of measuring effective rainfall that included a rain-gauge held below a layer of soil and plants that simulated the land.

Observations conducted at Pune, Agra, Madras and Bhadrachalam all indicated that on clear windless nights, the minimum temperature is not on the ground but is lifted by a distance between 20 and 50 cm.

[11][12] The phenomenon has been named the Ramdas Layer,[13] and is attributed to the interaction of thermal radiation effects on atmospheric aerosols and convection transfer close to the ground.