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| 4 | <TITLE>GEISA-97 (Home page)</TITLE> |
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| 8 | |
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| 9 | <CENTER><TABLE BORDER=8 CELLSPACING=0 CELLPADDING=0 WIDTH="80%" BGCOLOR="#FFFF00" > |
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| 10 | <TR> |
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| 11 | <TD> |
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| 12 | <CENTER><P><B><FONT COLOR="#FF0000"><FONT SIZE=+1>GEISA-97 overview</FONT></FONT></B></P></CENTER> |
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| 13 | </TD> |
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| 14 | </TR> |
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| 15 | </TABLE></CENTER> |
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| 16 | |
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| 17 | <CENTER><P> </P></CENTER> |
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| 18 | |
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| 19 | <CENTER><P><A NAME="overview"></A><B>OVERVIEW OF THE 1997 EDITION OF THE |
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| 20 | GEISA SPECTROSCOPIC DATABANK </B></P></CENTER> |
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| 21 | |
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| 22 | <P> The <A HREF="geisa_authors.html">1997 version of |
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| 23 | the GEISA databank</A> (hereafter referred to as GEISA-97) contains line |
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| 24 | parameters for 42 molecules (96 isotopic species) with 1,346,266 entries |
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| 25 | between 0 and 22,656 cm<SUP>-1</SUP>. It has molecules of interest for |
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| 26 | both terrestrial and other planetary atmospheres (for example, C<SUB>2</SUB>H<SUB>4</SUB>, |
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| 27 | GeH<SUB>4</SUB>, C<SUB>3</SUB>H<SUB>8</SUB>, C<SUB>2</SUB>N<SUB>2</SUB>, |
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| 28 | C<SUB>4</SUB>H<SUB>2</SUB>, HC<SUB>3</SUB>N, H<SUB>2</SUB>S, HCOOH and |
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| 29 | C<SUB>3</SUB>H<SUB>4</SUB>, for the Giant Planets). GEISA-97 has been developed |
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| 30 | in close cooperation with the contributors of three spectroscopic databases, |
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| 31 | ATMOS-95 (Atmospheric Trace Molecule Spectroscopy) (Brown et al., 1996), |
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| 32 | HITRAN-96 (HIgh resolution TRANsmission) (Rothman et al., 1998) and TDS |
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| 33 | (Tomsk Dijon Spectroscopic project; Traitement des Données Spectroscopiques)/STDS |
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| 34 | (Spherical Top Data System) (Tyuterev et al., 1994; Wenger and Champion, |
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| 35 | 1998). </P> |
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| 36 | |
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| 37 | <P> Since the release of the |
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| 38 | former edition in 1992 (Husson et al., 1992; 1994), hereafter referred |
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| 39 | to as <A HREF="http://ara.lmd.polytechnique.fr/geisaen.html">GEISA-92</A> |
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| 40 | , two new species, HO<SUB>2</SUB> and ClONO<SUB>2</SUB>, (formerly only |
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| 41 | present in the cross-sections file of GEISA-92), have been added for the |
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| 42 | first time, and seventeen existing molecules: O<SUB>3</SUB>, N<SUB>2</SUB>O, |
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| 43 | CH<SUB>4</SUB>, NO, SO<SUB>2</SUB>, NO<SUB>2</SUB>, NH<SUB>3</SUB>, HNO<SUB>3</SUB>, |
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| 44 | OH, ClO, OCS, <SUP>13</SUP>C<SUP>12</SUP>CH<SUB>6</SUB>, CH<SUB>3</SUB>D, |
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| 45 | C<SUB>2</SUB>H<SUB>2</SUB>, C<SUB>2</SUB>H<SUB>4</SUB>, H<SUB>2</SUB>O<SUB>2</SUB>, |
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| 46 | H<SUB>2</SUB>S, have been updated for GEISA-97. These changes have added |
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| 47 | 10 new isotopes: three for the new molecules and seven for the already |
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| 48 | existing molecules (two in O<SUB>3</SUB>, one in CO, two in OCS, one in |
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| 49 | C<SUB>2</SUB>H<SUB>6</SUB>, and one in C<SUB>2</SUB>H<SUB>4</SUB>) and |
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| 50 | the parameters of nineteen species have been updated or included. </P> |
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| 51 | |
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| 52 | <P> <A HREF="geisa_table1.html"> |
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| 53 | In the detailed summary of the line parameters in GEISA-97 </A> , |
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| 54 | in Table 1, the items listed for each molecular species, given in column |
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| 55 | 1, are: the identification code (ID codes defined for the GEISA management |
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| 56 | software in Chedin et al., 1985, 1986), the number of lines, the intensity |
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| 57 | average, the mean halfwidth at half maximum, the identification codes of |
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| 58 | its various isotopes, and for each isotope: the number of lines, the transitions |
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| 59 | minimum and maximum wavenumbers (in cm<SUP>-1</SUP>), and the lines intensities |
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| 60 | minimum and maximum values (in cm molecule<SUP>-1</SUP>), in columns 2 |
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| 61 | to 11, respectively.</P> |
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| 62 | |
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| 63 | <P> In addition to the individual |
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| 64 | lines spectroscopic data catalog, GEISA-97 also has a catalog of <A HREF="geisa_gs_cross.html">cross-sections</A> |
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| 65 | at different temperatures and pressures for species (such as chlofluorocarbons) |
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| 66 | with complex spectra that are too dense for discrete parameterization.</P> |
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| 67 | |
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| 68 | <P>The current version of the GEISA-97 cross-sections database contains |
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| 69 | <I>4,716,743 entries </I>related to 23 molecules. <A HREF="geisa_tb11.html">In |
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| 70 | the GEISA-97 cross-sections file content informations,</A> summarized in |
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| 71 | Table 2, in the first column are listed the molecules included with their |
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| 72 | name (for the CFC's) and corresponding chemical formula; colums 2 and 3 |
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| 73 | provide the cross-sections spectral intervals availability and temperature |
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| 74 | conditions; the related author references are in column 4. It should be |
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| 75 | noted that, for the majority of the molecules, the database comprises cross-sections |
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| 76 | for a set of temperatures and pressures corresponding to layers of the |
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| 77 | US standard atmosphere models, that allows simulations of the radiation |
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| 78 | propagation along slant paths in the atmosphere. Usually, the cross-sections |
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| 79 | are provided at uniform frequency steps for a given molecule, as in the |
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| 80 | case of the data listed in Table 2, except for the ones of Li and Varanasi, |
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| 81 | 1994; Varanasi and Nemtchinov, 1994; Varanasi et al., 1994, which are not |
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| 82 | given on uniform cm<SUP>-1</SUP> net steps. They were recorded for different |
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| 83 | conditions of pressure and temperature, at different resolutions, whith |
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| 84 | corresponding different step sizes. </P> |
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| 85 | |
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| 86 | <P> </P> |
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| 87 | |
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| 88 | <CENTER><P><B><A HREF="geisa_jqsrt_ar.html">REFERENCES</A></B></P></CENTER> |
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| 89 | |
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| 90 | <CENTER><P> </P></CENTER> |
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| 91 | |
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