-
Notifications
You must be signed in to change notification settings - Fork 3
/
updates-3.6.html
218 lines (148 loc) · 13 KB
/
updates-3.6.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
<html>
<head>
<title>WRFDA Updates for 3.6</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="KEYWORDS" content="meteorology, mesoscale, microscale, weather modeling, forecasting weather, weather prediction, predictability, cloud systems, boundary layers, surface-atmosphere interactions, convective cloud systems, atmospheric chemistry, precipitating weather systems, wildfire research, National Center for Atmospheric Research">
<meta name="DESCRIPTION" content="WRF Data Assimilation Users homepage">
<meta name="ROBOTS" content="INDEX,FOLLOW">
<meta name="resource-type" content="document">
<meta http-equiv="expires" content="0">
<meta name="author" content="MMM Webmaster">
<meta name="copyright" content="Copyright (c) 2017 by UCAR">
<meta name="revisit-after" content="1 days">
<meta name="distribution" content="Global">
<meta name="rating" content="General">
<SCRIPT language=JavaScript src="./scripts/menu_array.js" type=text/javascript></SCRIPT>
<SCRIPT language=JavaScript src="./scripts/mmenu.js" type=text/javascript></SCRIPT>
<link href="./images/wrfstyle.css" rel="stylesheet" type="text/css">
</head>
<body bgcolor="#FFFFFF" background="./images/back2.jpg" link="#000099" vlink="#000099" alink="#FF3300" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr bgcolor="#000000">
<td height="10" bgcolor="#000000"><div align="left"><img src="images/transgif.gif" width="1" height="1"></div>
</td>
</tr>
<tr valign="top">
<td height="10" bgcolor="#DDFFDD"><img src="images/header_new_cropped.png" height="56" border="0"></td>
</tr>
<tr bgcolor="#FFCC33">
<td height="6" background="./images/goldrule.jpg"><img src="images/goldrule.jpg" width="1" height="1"></td>
</tr>
<tr>
<td height="34" bgcolor="#009933"> </td>
</tr>
<tr>
<td height="2" bgcolor="#ffcc66"><img src="images/transgif.gif" width="1" height="1"></td>
</tr>
</table>
<table width="100%" height="89%" border="0" cellpadding="0" cellspacing="0" class="background">
<tr>
<td width="100%" height="838" valign="top" bgcolor="#CBFFCD"><table width="780" border="0" cellpadding="0" cellspacing="0">
<tr valign="top">
<td height="842" bgcolor="#009933"><p align="right"> </p>
<p align="center"><a href="system.html" class="leftnavlink">System Overview</a></p>
<p align="center"><a href="updates-3.9.html" class="leftnavlink">WRFDA V3.9</a></p>
<p align="center"><a href="updates-3.8.1.html" class="leftnavlink">WRFDA V3.8.1</a></p>
<p align="center"><a href="updates-3.8.html" class="leftnavlink">WRFDA V3.8</a></p>
<p align="center"><a href="updates-3.7.1.html" class="leftnavlink">WRFDA V3.7.1</a></p>
<p align="center"><a href="updates-3.7.html" class="leftnavlink">WRFDA V3.7</a></p>
<p align="center"><a href="updates-3.6.1.html" class="leftnavlink">WRFDA V3.6.1</a></p>
<p align="center" style="border-width: 5px;border-style: solid;border-color: #CBFFCD;background-color: #CBFFCD;font-family: Arial; line-height: 10pt;font-weight: bold;">WRFDA V3.6</p>
<p align="center"><a href="updates-3.5.1.html" class="leftnavlink">WRFDA V3.5.1</a></p>
<p align="center"><a href="updates-3.5.0.1.html" class="leftnavlink">WRFDA V3.5.0.1</a></p>
<p align="center"><a href="updates-3.5.html" class="leftnavlink">WRFDA V3.5</a></p>
<p align="center"><a href="updates-3.4.1.html" class="leftnavlink">WRFDA V3.4.1</a></p>
<p align="center"><a href="updates-3.4.html" class="leftnavlink">WRFDA V3.4</a></p>
<p align="center"><a href="updates-older.html" class="leftnavlink">Older versions</a></p>
<p align="center"><a href="tutorial.html" class="leftnavlink">Tutorials</a></p>
<p align="center"><a href="download/tools.html" class="leftnavlink">Tools</a></p>
<p align="center"><a href="known-problems.html" class="leftnavlink">Known Problems and Fixes</a></p></td>
<td width="663" bgcolor="#CBFFCD"><p> </p>
<p class="pagetitle">WRFDA Version 3.6 update summary</p>
<blockquote>
<h2>WRFDA Version 3.6 was released on April 18, 2014. </h2>
<h3><big>New features:</big></h3>
<ul class="bodytext"><li><a href="#dual_res">Dual-resolution hybrid assimilation</a> has been implemented.</li>
<li>New observations can be assimilated:</li>
<ul class="bodytext"><li><a href="#seviri">Meteosat SEVIRI</a></li>
<li><a href="#metop-b">Metop-B instruments</a></li>
<li><a href="#airep">AIREP humidity observations</a></li></ul>
<li><a href="#thinning">Observation thinning for conventional observations in ASCII format</a></li></ul>
<h3><big>Updated features:</big></h3>
<ul class="bodytext"></li>GPS Radio Occultation data <a href="#gpsro">can now be read separately from other conventional data types</a></li>
<li>Wind speed/direction assimilation has been updated, and namelist options have changed. See <a href="Docs/user_guide_V3.6/users_guide_chap6.htm#_Hybrid_Data_Assimilation">the relevant section of the User's Guide</a> for more information.</li>
<li>Updated libraries:</li>
<ul class="bodytext"><li>CRTM Version 2.1.3</li>
<li>BUFR Version 10.2.3</li>
<li>RTTOV interface is now for RTTOV Version 11.1</li></ul>
<li>Bug fixes and performance improvements</li>
<li><a href="download/wrfplus.html">WRFPLUS</a> (WRF adjoint and tangent linear model) has been upgraded to V3.6 and is consistent with the released WRF version 3.6.</li></ul>
<p class="bodytext">For instructions on compiling and running the latest version of WRFDA, please refer to the updated <a href="Docs/user_guide_V3.6/WRFDA_Users_Guide.html">User's Guide</a></p>
</blockquote>
<p class="pagetitle">Version 3.6 update details</p>
<blockquote>
<a name="dual_res"></a>
<h1>Dual-resolution hybrid assimilation</h1>
<p class="bodytext">WRFDA now has an option for dual-resolution hybrid data assimilation where a high-resolution background is combined with a low-resolution ensemble to produce a high-resolution analysis. The procedure for hybrid assimilation (as described in <a href="Docs/user_guide_V3.6/users_guide_chap6.htm#_Hybrid_Data_Assimilation_2">the relevant section of the User's Guide</a>) is not changed, but there is an additional namelist option for the dual-resolution capability:</p>
<p class="bodytext">&wrfvar16<br>
hybrid_dual_res: (logical) Switch for using dual-resolution hybrid<br>
true: use dual-resolution hybrid assimilation<br>
false: ensemble members and analysis will be the same resolution (default)</p>
<p class="bodytext">In addition, the user will need to provide a first guess file for the ensemble domain (named "fg_ens"); this is only needed to extract mapping info, so the exact file does not matter.</p>
<a name="seviri"></a>
<h1>Meteosat SEVIRI assimilation</h1>
<p style="padding-right: 45px;padding-left: 45px;"><table width="100%" border="1" class="bodytable" style="background-color:white;"><tr><td style="padding-right: 45px;padding-left: 45px;"><b>Note:</b> There is a known bug in the original release version: <a href="known-problems.html#V3_6_run">see this page</a> for a solution.</td></tr></table></p>
<p class="bodytext">Metosat 8, 9, and 10 (AKA MSG 1, 2, and 3) carry the Spinning Enhanced Visible and InfraRed Imager (SEVIRI). WRFDA can now assimilate radiance observations from this instrument, which are available in BUFR format from EUMETSAT. This is a limited implementation for now, only covering the 8 infrared channels. The relevant namelist options are as follows:</p>
<p class="bodytext">&wrfvar4<br>
use_seviriobs: (logical) Switch for reading SEVIRI observations.<br>
true: WRFDA will look for the "seviri.bufr" file and read it if it exists<br>
false: no SEVIRI data will be read (default)</p>
<p class="bodytext">&wrfvar14<br>
rtminit_platform = 12, ("MSG", Meteosat Second Generation)<br>
rtminit_satid = 1,2,3 (for MSG 1, 2, and 3 respectively)<br>
rtminit_sensor = 21, ("seviri")</p>
<a name="metop-b"></a>
<h1>Metop-B instruments</h1>
<p class="bodytext">Metop-B (AKA Metop 1) is a polar-orbiting satellite run by EUMETSAT, and is the sister satellite for Metop-A. Data from the IASI, AMSU-A, and MHS instruments from Metop-A could already be assimilated in WRFDA; starting with 3.6 this data can also be assimilated from Metop-B.</p>
<p class="bodytext"><em>Beware of the strange numbering system for Metop!</em> Use namelist setting "rtminit_platform = 10" for all Metop satellites. Metop-A, officially named "Metop 2", was the first operational Metop satellite. However, because "Metop-A" is officially named "Metop 2", you should set "rtminit_satid = 2" for Metop-A, and "rtminit_satid = 1" for Metop-B. These conventions are set by EUMETSAT: don't blame us.</p>
<a name="airep"></a>
<h1>AIREP humidity observations</h1>
<p class="bodytext">AIREP (short for "aircraft report") is an automated weather observation from an airplane. WRFDA has had the ability to assimilate AIREP observations of temperature and wind for many years, but not moisture. These moisture observations can now be read and assimilated by WRFDA. Users will not need to change any settings to assimilate these observations: if they are present in your observation files they will be read and assimilated.</p>
<a name="thinning"></a>
<h1>Observation thinning for conventional observations in ASCII format</h1>
<p class="bodytext">WRFDA now allows for the thinning of conventional observations assimilated in ASCII format; previously this options was only available for assimilating PREPBUFR-format observations. The relevant namelist options are as follows:</p>
<p class="bodytext">&wrfvar4<br>
thin_conv_ascii: (logical) Switch for thinning conventional obs for ob_format=2 (ASCII).<br>
true: conventional observations will be thinned<br>
false: all observations with good quality will be assimilated (default)<br>
thin_mesh_conv: (real) The size of the thinning mesh boxes, in km (default: 20.).</p>
<p class="bodytext"><em>Note for users performing radar assimilation</em>: Thining routines have been implemented for radar observations, but the code has not been well tested. We recommend not using thinning with radar observations at this time.</p>
<a name="gpsro"></a>
<h1>GPSRO</h1>
<p class="bodytext">Users now have more flexibility when assimilating GPS Radio Occulation (GPSRO) observations. These observations can be read in ASCII text format (from file "ob.ascii", potentially along with other conventional observation types) or in NCEP PREPBUFR format (from file "gpsro.bufr"). Previously, users reading conventional observations from "ob.ascii" could not read GPSRO observations from "gpsro.bufr" at the same time, but now that is possible with the namelist option "ob_format_gpsro" under record &wrfvar3. For "ob_format_gpsro = 1", WRFDA will read GSPRO observations from "gpsro.bufr". For "ob_format_gpsro = 2", WRFDA will read GSPRO observations from "ob.ascii".</p>
<p> </p>
</blockquote>
<p class="pagetitle">Helpful links</p>
<blockquote>
<li class="bodytext"><big><a href="./Docs/user_guide_V3.6/users_guide_chap6.htm#_Installing_WRF-Var">Compiling WRFDA</a></big></li>
<li class="bodytext"><big><a href="./Docs/user_guide_V3.6/users_guide_chap6.htm#_Running_WRF-Var_1">Running WRFDA</a></big></li>
<li class="bodytext"><big><a href="./Docs/user_guide_V3.6/users_guide_chap6.htm#_Description_of_Namelist_1">List and description of namelist variables</a></big></li>
<p class="bodytext"><br></p>
<p align="center" class="detailtextRed"><br>
<script language="JavaScript"><!-- ;;;;;;;;;;;-->
<!--
document.write("updated " + document.lastModified);
// -->
</script><br><br>
</p>
<p> </p>
</blockquote> </td>
</tr>
</table></td>
</tr>
<tr>
<td height="50" bgcolor="#009933" class="detailtext"> </td>
</tr>
</table>
</body>
</html>