【正文】 6 1 311996 2 291996 3 311996 4 291996 5 311996 6 301996 7 311996 8 301996 9 281996 10 。 ) File Creation: Wed Jun 5 12:05:50 2013 RECIPROCITY Use of these data implies an agreement to reciprocate. Laboratories making similar measurements agree to make their own data available to the general public and to the scientific munity in an equally plete and easily accessible form. Modelers are encouraged to make available to the munity, upon request, their own tools used in the interpretation of the ESRL data, namely well documented model code, transport fields, and additional information necessary for other scientists to repeat the work and to run modified versions. Model availability includes collaborative support for new users of the models. See Data from March 1958 through April 1974 have been obtained by C. David Keeling of the Scripps Institution of Oceanography (SIO) and were obtained from the Scripps website (). The average column contains the monthly mean CO2 mole fraction determined from daily averages. The mole fraction of CO2, expressed as parts per million (ppm) is the number of molecules of CO2 in every one million molecules of dried air (water vapor removed). If there are missing days concentrated either early or late in the month, the monthly mean is corrected to the middle of the month using the average seasonal cycle. Missing months are denoted by . The interpolated column includes average values from the preceding column and interpolated values where data are missing. Interpolated values are puted in two steps. First, we pute for each month the average seasonal cycle in a 7year window around each monthly value. In this way the seasonal cycle is allowed to change slowly over time. We then determine the trend value for each month by removing the seasonal cycle。 ) File Creation: Wed Jun 5 12:05:50 2013 RECIPROCITY Use of these data implies an agreement to reciprocate. Laboratories making similar measurements agree to make their own data available to the general public and to the scientific munity in an equally plete and easily accessible form. Modelers are encouraged to make available to the munity, upon request, their own tools used in the interpretation of the ESRL data, namely well documented model code, transport fields, and additional information necessary for other scientists to repeat the work and to run modified versions. Model availability includes collaborative support for new users of the models. See Data from March 1958 through April 1974 have been obtained by C. David Keeling of the Scripps Institution of Oceanography (SIO) and were obtained from the Scripps website (). The estimated uncertainty in the annual mean is the standard deviation of the differences of annual mean values determined independently by NOAA/ESRL and the Scripps Institution of Oceanography. NOTE: In general, the data presented for the last year are subject to change, depending on recalibration of the reference gas mixtures used, and other quality control procedures. Occasionally, earlier years may also be changed for the same reasons. Usually these changes are minor. CO2 expressed as a mole fraction in dry air, micromol/mol, abbreviated as ppm year mean unc 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 USE OF NOAA ESRL DATA These data are made freely available to the public and the scientific munity in the belief that their wide dissemination will lead to greater understanding and new scientific insights. The availability of these data does not constitute publication of the data. NOAA relies on the ethics and integrity of the user to insure that ESRL receives fair credit for their work. If the data are obtained for potential use in a publication or presentation, ESRL should be informed at the outset of the nature of this work. If the ESRL data are essential to the work, or if an important result or conclusion depends on the ESRL data, coauthorship may be appropriate. This should be discussed at an early stage in the work. Manuscripts using the ESRL data should be sent to ESRL for review before they are submitted for publication so we can insure that the quality and limitations of the data are accurately represented. Contact: Pieter Tans (303 497 6678。[1] Pieler in atmospheric carbon dioxideGlobal. ://. esrl. noaa. gov/gmd/ccgg/trends/ . 2009 [2] Etheridge D M,Steele L P, el CO2record derived