The Earth System Research Laboratory - Global Monitoring Division (ESRL)
, formerly the Climate Monitoring and Diagnostics Laboratory (CMDL), is part of NOAA's Office of Oceanic and Atmospheric Research (OAR)
. The ESRL traces its roots in ozone monitoring back to the U.S. Weather
Bureau and its measurements of total column ozone as part of
the International Geophysical Year (IGY), 1957. W.D. Komhyr
established the U.S. Dobson network in its current form with
well-characterized and calibrated instruments and standardized
operating procedures in the early 1960s.