<!--Copyright (C) 1988-2005 by the Institute of Global Environment and Society (IGES). See file COPYRIGHT for more information.--> <html> <head> <title>GRIB Vertical Levels</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" href="../../assets/NewIGES.css"> </head> <body bgcolor="#FFFFFF"> <p class="plaintextbold">TABLE 3: VERTICAL LEVELS</p> <table border="1" cellspacing="0" cellpadding="3"> <tr> <td width="48" class="plaintext" valign="top">VALUE</td> <td width="220" class="plaintext" valign="top">DESCRIPTION</td> <td align="center" colspan="2" class="plaintext">REQUIRED PARAMETERS</td> <td width="61" class="plaintext" valign="top">ABBREV.</td> </tr> <tr> <td width="48" class="plaintext" valign="top">0-99</td> <td width="220" class="plaintext" valign="top">Special Codes </td> <td align="center" colspan="2" class="plaintext">(See Table 3a below)</td> <td width="61" class="plaintext" valign="top"> </td> </tr> <tr> <td width="48" class="plaintext" valign="top">100</td> <td width="220" class="plaintext" valign="top">Isobaric level</td> <td align="center" colspan="2" class="plaintext">Pressure in hPa (2 octets)</td> <td width="61" class="plaintext" valign="top">ISBL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">101</td> <td width="220" class="plaintext" valign="top">Layer between two isobaric levels</td> <td width="167" align="center" class="plaintext">Pressure of top <br> in kPa</td> <td width="167" align="center" class="plaintext">Pressure of bottom <br> in kPa</td> <td width="61" class="plaintext" valign="top"> </td> </tr> <tr> <td width="48" class="plaintext" valign="top">102</td> <td width="220" class="plaintext" valign="top">Mean sea level</td> <td align="center" width="167" class="plaintext">0</td> <td align="center" width="167" class="plaintext">0</td> <td width="61" class="plaintext" valign="top">MSL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">103</td> <td width="220" class="plaintext" valign="top">Specified altitude above MSL</td> <td align="center" colspan="2" class="plaintext">Altitude in meters</td> <td width="61" class="plaintext" valign="top">GPML</td> </tr> <tr> <td width="48" class="plaintext" valign="top">104</td> <td width="220" class="plaintext" valign="top">Layer between two specified altitudes above MSL</td> <td align="center" width="167" class="plaintext">Altitude of top <br> in hm</td> <td align="center" width="167" class="plaintext">Altitude of bottom <br> in hm</td> <td width="61" class="plaintext" valign="top">GPMY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">105</td> <td width="220" class="plaintext" valign="top">Specified height level above ground</td> <td align="center" colspan="2" class="plaintext">Height in meters</td> <td width="61" class="plaintext" valign="top">TGL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">106</td> <td width="220" class="plaintext" valign="top">Layer between two specified height levels above ground</td> <td align="center" class="plaintext" width="167">Height of top <br> in hm</td> <td align="center" class="plaintext" width="167">Height of bottom <br> in hm</td> <td width="61" class="plaintext" valign="top">HTGY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">107</td> <td width="220" class="plaintext" valign="top">Sigma level</td> <td align="center" colspan="2" class="plaintext">Sigma value in 1/10000 (2 octets)</td> <td width="61" class="plaintext" valign="top">SIGL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">108</td> <td width="220" class="plaintext" valign="top">Layer between two sigma levels</td> <td align="center" class="plaintext" width="167">Sigma value at top<br> in 1/100</td> <td align="center" class="plaintext" width="167">Sigma value at bottom <br> in 1/100</td> <td width="61" class="plaintext" valign="top">SIGY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">109</td> <td width="220" class="plaintext" valign="top">Hybrid level</td> <td align="center" colspan="2" class="plaintext">Level number (2 octets)</td> <td width="61" class="plaintext" valign="top">HYBL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">110</td> <td width="220" class="plaintext" valign="top">Layer between two hybrid levels</td> <td align="center" class="plaintext" width="167">Level number of top</td> <td align="center" class="plaintext" width="167">Level number of bottom</td> <td width="61" class="plaintext" valign="top">HYBY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">111</td> <td width="220" class="plaintext" valign="top">depth below land surface</td> <td align="center" colspan="2" class="plaintext">Depth in cm (2 octets)</td> <td width="61" class="plaintext" valign="top">DBLL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">112</td> <td width="220" class="plaintext" valign="top">Layer between two depths below land surface</td> <td align="center" class="plaintext" width="167"> <p>Depth of upper surface<br> in cm</p> </td> <td align="center" class="plaintext" width="167"> <p>Depth of lower surface<br> in cm</p> </td> <td width="61" class="plaintext" valign="top">DBLY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">113</td> <td width="220" class="plaintext" valign="top">Isentropic (theta) level</td> <td align="center" colspan="2" class="plaintext">Potential temperature in K</td> <td width="61" class="plaintext" valign="top">THEL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">114</td> <td width="220" class="plaintext" valign="top">Layer between two isentropic levels</td> <td align="center" class="plaintext" width="167"> <p>475 K minus theta of top <br> in K</p> </td> <td align="center" class="plaintext" width="167">475 K minus theta of bottom in K</td> <td width="61" class="plaintext" valign="top">THEY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">115</td> <td width="220" class="plaintext" valign="top">Level at specified pressure difference from ground</td> <td align="center" colspan="2" class="plaintext">Pressure difference in hPa (2 octets)</td> <td width="61" class="plaintext" valign="top">SPDL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">116</td> <td width="220" class="plaintext" valign="top">Layer between two levels at specified pressure difference from ground</td> <td align="center" class="plaintext" width="167">Pressure difference from ground to top in hPa</td> <td align="center" class="plaintext" width="167">Pressure difference from ground to bottom in hPa</td> <td width="61" class="plaintext" valign="top">SPDY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">117</td> <td width="220" class="plaintext" valign="top">Potential vorticity surface</td> <td align="center" colspan="2" class="plaintext">Potential vorticity value in units of 10<sup>-6</sup> K m<sup>2</sup>/kg s</td> <td width="61" class="plaintext" valign="top">PVL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">119</td> <td width="220" class="plaintext" valign="top">ETA level</td> <td align="center" colspan="2" class="plaintext">ETA value in 1/1000 (2 octets)</td> <td width="61" class="plaintext" valign="top">ETAL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">120</td> <td width="220" class="plaintext" valign="top">Layer between two ETA levels</td> <td align="center" class="plaintext" width="167">ETA value at top<br> in 1/100</td> <td align="center" class="plaintext" width="167">ETA value at bottom <br> in 1/100</td> <td width="61" class="plaintext" valign="top">ETAY</td> </tr> <tr> <td width="48" class="plaintext" valign="top">121</td> <td width="220" class="plaintext" valign="top">Layer between two isobaric surfaces (high precision)</td> <td align="center" class="plaintext" width="167">1100 minus pressure of <br> top in hPa</td> <td align="center" class="plaintext" width="167">1100 minus pressure of<br> bottom in hPa</td> <td width="61" class="plaintext" valign="top">IBYH</td> </tr> <tr> <td width="48" class="plaintext" valign="top">125</td> <td width="220" class="plaintext" valign="top">Specified height level above ground (high precision) <br> </td> <td align="center" colspan="2" class="plaintext">Height in cm (2 octets)</td> <td width="61" class="plaintext" valign="top">HGLH</td> </tr> <tr> <td width="48" class="plaintext" valign="top">128</td> <td width="220" class="plaintext" valign="top">Layer between two sigma levels (high precision) <br> </td> <td align="center" class="plaintext" width="167">1.1 minus sigma of top <br> in 1/1000 of sigma</td> <td align="center" class="plaintext" width="167">1.1 minus sigma of bottom <br> in 1/1000 of sigma</td> <td width="61" class="plaintext" valign="top">SGYH</td> </tr> <tr> <td width="48" class="plaintext" valign="top">141</td> <td width="220" class="plaintext" valign="top">Layer between two isobaric surfaces (mixed precision)</td> <td align="center" class="plaintext" width="167">Pressure of top in hPa</td> <td align="center" class="plaintext" width="167">1100 minus pressure of bottom in hPa</td> <td width="61" class="plaintext" valign="top">IBYM</td> </tr> <tr> <td width="48" class="plaintext" valign="top">160</td> <td width="220" class="plaintext" valign="top">Depth below sea level</td> <td align="center" colspan="2" class="plaintext">Depth in m (2 octets)</td> <td width="61" class="plaintext" valign="top">DBSL</td> </tr> <tr> <td width="48" class="plaintext" valign="top">200</td> <td width="220" class="plaintext" valign="top">Entire atmosphere </td> <td align="center" colspan="2" class="plaintext">0 (2 octets)</td> <td width="61" class="plaintext" valign="top">EATM</td> </tr> <tr> <td width="48" class="plaintext" valign="top">201</td> <td width="220" class="plaintext" valign="top">Entire ocean</td> <td align="center" colspan="2" class="plaintext">0 (2 octets)</td> <td width="61" class="plaintext" valign="top">EOCN</td> </tr> <tr> <td width="48" class="plaintext" valign="top">204-244</td> <td width="220" class="plaintext" valign="top">NCEP Special Levels & Layers</td> <td align="center" colspan="2" class="plaintext">See Table 3a</td> <td width="61" class="plaintext" valign="top"> </td> </tr> </table> <p class="plaintextbold">TABLE 3a: SPECIAL VERTICAL LEVELS</p> <table width="486" border="1" cellspacing="0" cellpadding="2"> <tr> <td width="47" class="plaintext">VALUE</td> <td width="357" class="plaintext">DESCRIPTION</td> <td width="62" class="plaintext">ABBREV.</td> </tr> <tr> <td width="47" class="plaintext">00 </td> <td width="357" class="plaintext">Reserved</td> <td width="62" class="plaintext"> </td> </tr> <tr> <td width="47" class="plaintext">01 </td> <td width="357" class="plaintext">Ground or water surface </td> <td width="62" class="plaintext">SFC </td> </tr> <tr> <td width="47" class="plaintext">02 </td> <td width="357" class="plaintext">Cloud base level </td> <td width="62" class="plaintext">CBL</td> </tr> <tr> <td width="47" class="plaintext">03</td> <td width="357" class="plaintext">Cloud top level</td> <td width="62" class="plaintext"> CTL </td> </tr> <tr> <td width="47" class="plaintext">04 </td> <td width="357" class="plaintext">Level of 0 deg (C) isotherm </td> <td width="62" class="plaintext">0DEG </td> </tr> <tr> <td width="47" class="plaintext">05</td> <td width="357" class="plaintext">Level of adiabatic condensation lifted from the surface </td> <td width="62" class="plaintext">ADCL </td> </tr> <tr> <td width="47" class="plaintext"> 06</td> <td width="357" class="plaintext">Maximum wind level </td> <td width="62" class="plaintext">MWSL </td> </tr> <tr> <td width="47" class="plaintext">07</td> <td width="357" class="plaintext">Tropopause </td> <td width="62" class="plaintext">TRO</td> </tr> <tr> <td width="47" class="plaintext"> 08 </td> <td width="357" class="plaintext">Nominal top of atmosphere </td> <td width="62" class="plaintext">NTAT </td> </tr> <tr> <td width="47" class="plaintext">09</td> <td width="357" class="plaintext">Sea bottom </td> <td width="62" class="plaintext">SEAB </td> </tr> <tr> <td width="47" class="plaintext">10-19 </td> <td width="357" class="plaintext">Reserved </td> <td width="62" class="plaintext"> </td> </tr> <tr> <td width="47" class="plaintext">20 </td> <td width="357" class="plaintext">Isothermal level (temperature in 1/100 K in octets 11 and 12) </td> <td width="62" class="plaintext">TMPL </td> </tr> <tr> <td width="47" class="plaintext">21-99</td> <td width="357" class="plaintext">Reserved </td> <td width="62" class="plaintext"> </td> </tr> <tr> <td width="47" class="plaintext">204</td> <td width="357" class="plaintext">Highest tropospheric freezing level </td> <td width="62" class="plaintext">HTFL</td> </tr> <tr> <td width="47" class="plaintext">209 </td> <td width="357" class="plaintext">Boundary layer cloud bottom level </td> <td width="62" class="plaintext">BCBL </td> </tr> <tr> <td width="47" class="plaintext">210 </td> <td width="357" class="plaintext">Boundary layer cloud top level </td> <td width="62" class="plaintext">BCTL </td> </tr> <tr> <td width="47" class="plaintext">211 </td> <td width="357" class="plaintext">Boundary layer cloud layer </td> <td width="62" class="plaintext">BCY </td> </tr> <tr> <td width="47" class="plaintext">212 </td> <td width="357" class="plaintext">Low cloud bottom level </td> <td width="62" class="plaintext">LCBL</td> </tr> <tr> <td width="47" class="plaintext">213</td> <td width="357" class="plaintext"> Low cloud top level </td> <td width="62" class="plaintext">LCTL </td> </tr> <tr> <td width="47" class="plaintext">214 </td> <td width="357" class="plaintext">Low cloud layer</td> <td width="62" class="plaintext"> LCY </td> </tr> <tr> <td width="47" class="plaintext">222</td> <td width="357" class="plaintext">Middle cloud bottom level </td> <td width="62" class="plaintext">MCBL </td> </tr> <tr> <td width="47" class="plaintext">223 </td> <td width="357" class="plaintext">Middle cloud top level </td> <td width="62" class="plaintext">MCTL </td> </tr> <tr> <td width="47" class="plaintext">224 </td> <td width="357" class="plaintext">Middle cloud layer </td> <td width="62" class="plaintext">MCY</td> </tr> <tr> <td width="47" class="plaintext">232 </td> <td width="357" class="plaintext">High cloud bottom level </td> <td width="62" class="plaintext">HCBL</td> </tr> <tr> <td width="47" class="plaintext">233</td> <td width="357" class="plaintext">High cloud top level </td> <td width="62" class="plaintext">HCTL</td> </tr> <tr> <td width="47" class="plaintext">234 </td> <td width="357" class="plaintext">High cloud layer </td> <td width="62" class="plaintext"> HCY </td> </tr> <tr> <td width="47" class="plaintext">242 </td> <td width="357" class="plaintext">Convective cloud bottom level </td> <td width="62" class="plaintext">CCBL </td> </tr> <tr> <td width="47" class="plaintext">243 </td> <td width="357" class="plaintext">Convective cloud top level </td> <td width="62" class="plaintext">CCTL </td> </tr> <tr> <td width="47" class="plaintext">244</td> <td width="357" class="plaintext">Convective cloud layer </td> <td width="62" class="plaintext">CCY </td> </tr> </table> <p> </p><p> </p> </body> </html>