Abstract
The thermal emission band at 1306 cm{sup -1} of atmospheric methane, an important greenhouse gas, is presented for a cold, clear day in January 1994. A spectrum of the nonmethane emission features has been simulated using the FASCD3P radiation code and measured radiosonde profiles of temperature, pressure, and relative humidity. This has enabled a successful subtraction of interfering emission features from the methane emission region. The methane radiance has been simulated using the FASCD3P radiation code. A comparison of the observed and simulated emission bands of methane shows good agreement at all frequencies of emission. From these measurements the total downward greenhouse radiative flux at the ground from the methane emission band for a cold, clear winter day has been determined to be 1.7 W m{sup -2} {plus_minus} 10%.
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