1900-1949

1. [Lane 1923]
   First recognition that climate change imposed a signature on subsurface temperatures.
   Ref. de [Pollack and Huang 2000]

2. [Defant 1924]
   Derives a simple typing scheme of pressure anomalies over the North Atlantic. His four types are related tho several modes of the seesaw.
   Ref. de [van Loon and Rogers 1978]

3. [Brooks and Quennell 1926]
   Classified monthly pressure anomaly patterns over the Northern Hemisphere by using above or below normal pressure over the Faroes. Of the 10 major categories two represent the seesaw which ocurred in 38 $\%$ of the winter cases between 1873 and 1918.
   Ref. de [van Loon and Rogers 1978]

4. [Walker and Bliss 1932]
   Describes the seesaw as part of the North Atlantic Oscillation which define as “the tendency for pressure to be low near Iceland in winter when it is high near the Azores and south-west Europe;... this distribution of course is associated with high temperature in north-west Europe and low temperatures off the Labrador coast.”
   Ref. de [van Loon and Rogers 1978]

5. [Angstrom 1935]
   Ilustrates conection between temperatures and pressure in NAO.
   Ref. de [van Loon and Rogers 1978]

6. [Loewe 1937] & [Loewe 1966]
   Explanation of the seesaw in variations of general circulation over Atlantic.
   Ref. de [van Loon and Rogers 1978]

7. [Callendar 1938] & [Callendar 1940] & [Callendar 1958]
   Analysis of emissions of CO2 and concentration between 1880 and 1935. Also studies effect on temperature. Calculates a trend of 0.03 K per decade for climate change. Findes increase of 0.05K in temperature in the last 50 years. observations.
   Climate change, CO2.

8. [Saabye 1942]
   Publication of Hans Egede Saabye diary in Greenland (1770-78): “In Greenland all winters are severe, yet they are not alike. The Danes have noticed that when the winter in Denmark was severe, as we perceive it, the winter in Greenland in its manner was mild, and conversely”
   Comment of the Editor: “The phenomenon mentioned here was always a common concept, and it is still the prevalent one. Considering that it has been observed for so long it is undoubtedly correct even if it cannot, perhaps, be meteorologically explained. ”
   Ref. de [van Loon and Rogers 1978]

9. [Dannmeyer 1948]
   Description of intensity of winters 1709-1908.
   Ref. de [van Loon and Rogers 1978]

10. [Cochrane and Orcutt 1949]
    Aplication of least squares regression to relationships containing autocorrelated error terms
    Relevant for homogeneity and two phase regresion and Durbin-Watson

11. [Plass 1956] & [Plass 1957]
    Balance of surface energy assuming radiative equilibrium and atmospheric moisture constant. Heating of 2.5 K with CO2 doubling. Influence of glaciations. Feedback proccess of water vapour. Influence of O3.
    Climate change, CO2.