mauna loa

• Cfc - 11 and cfc - 12 have the highest concentrations of the man - made chlorocarbons , around 0 . 27 and 0 . 55 ppbv , respectively measured at mauna loa in 1997 , fig . 5 6 . as indicated in their gwp values , these two gases are strong infrared absorbers
  在多种人造的氯氟碳化合物中，以cfc - 11及cfc - 12的浓度最高，分别约为0 . 27及0 . 55ppbv量度于冒纳罗亚观象台, 1997 ,见图五和六。