.. _Section_FileType_subsets: Subsetted WRF Output ==================== The raw WRF output has been post-processed into variable subsets, where related variables are grouped into separate files. This will meet the needs of a large percentage of users so they will not need to download the full wrfout files. For example, the primary meteorological state variables like temperature, pressure, and winds destaggered to the center point of the grid cells are all in the ``met`` subset category. The frequency of the available subsets mimics the output frequency from the WRF simulations. So, domains D1, D2, and D3 have subsets every 15 minutes, and D4 has subsets every five minutes. Most variables in the subset files are directly copied from the wrfout files. However, additional diagnostic variables are calculated to simplify data processing for users. Examples include: * Variables that are originally on staggered grids, primarily the winds, are interpolated to the grid cell centers; * Normal temperature is calculated from the output potential temperature perturbation; * Convective available potential energy (CAPE) and related diagnostics like convective inhibition are calculated. Another helpful post-processing step is interpolation to alternative vertical grids. Subset groupings are provided on the raw model levels, pressure levels, height above ground, and height above mean sea level. The specific levels are listed in :numref:`TableSubsetLevels`. Users interested in generating their own subset files can start with the ``subsetwrf`` software provided with LASSO-CACTI and adapt it to suit their needs. For example, some users have wanted more vertical levels than those provided in the height interpolations. Others have wanted the variables grouped differently to assist in their research. More detail about ``subsetwrf`` is provided in the :ref:`software section ` of the documentation. The subsetting can be done on ARM’s Cumulus2 cluster to avoid having to first download the wrfout files to an outside institution. .. tabularcolumns:: |p{3cm}|p{12.24cm}| .. table:: Levels available for the different subset files, both raw model levels and interpolated to alternate heights. :name: TableSubsetLevels :class: tight-table +-----------------------+-------------------------------------------------------------------------+ | | Level Configuration | | Provided Levels | | | (units; count) | | +=======================+=========================================================================+ | Raw model levels | 0.9985125, 0.9954678, 0.9922807, 0.9889451, 0.9854548, 0.981803, | | on mass grid | 0.9779831, 0.9739879, 0.9698104, 0.9654431, 0.9608783, 0.9561083, | | (eta; 149) | 0.951125, 0.9459202, 0.9404855, 0.9348122, 0.9288918, 0.9227152, | | | 0.9162734, 0.9095575, 0.9025581, 0.8952659, 0.8876719, 0.8797667, | | | 0.8715411, 0.862986, 0.8540924, 0.8448515, 0.8352549, 0.8252944, | | | 0.8149619, 0.8042502, 0.7931526, 0.7816627, 0.769775, 0.7574849, | | | 0.7447884, 0.7316829, 0.7181668, 0.7042396, 0.6899024, 0.6751577, | | | 0.6600096, 0.644464, 0.6285287, 0.6122136, 0.5955307, 0.5784943, | | | 0.561121, 0.54343, 0.5254432, 0.5071849, 0.4886823, 0.4699655, | | | 0.4514357, 0.4335449, 0.4163461, 0.3998125, 0.3839184, 0.3686391, | | | 0.3539508, 0.3398306, 0.3262565, 0.3132074, 0.300663, 0.2886038, | | | 0.2770111, 0.2658667, 0.2551534, 0.2448544, 0.2349538, 0.225436, | | | 0.2162865, 0.2074908, 0.1990353, 0.1909069, 0.1830928, 0.175581, | | | 0.1683597, 0.1614177, 0.1547443, 0.1483289, 0.1421617, 0.136233, | | | 0.1305336, 0.1250546, 0.1197876, 0.1147242, 0.1098568, 0.1051775, | | | 0.1006793, 0.09635506, 0.09219806, 0.08820182, 0.08436017, 0.0806671, | | | 0.07711688, 0.07370396, 0.07042304, 0.06726904, 0.06423703, 0.06132228, | | | 0.05852027, 0.05582664, 0.05323719, 0.05074789, 0.04835489, 0.04605443, | | | 0.04384294, 0.041717, 0.03967329, 0.03770861, 0.03581993, 0.0340043, | | | 0.0322589, 0.030581, 0.028968, 0.02741739, 0.02592675, 0.02449377, | | | 0.02311621, 0.02179193, 0.02051887, 0.01929506, 0.01811858, | | | 0.0169876, 0.01590037, 0.01485518, 0.01385042, 0.01288453, | | | 0.01195599, 0.01106337, 0.01020527, 0.009380363, 0.00858737, | | | 0.00782504, 0.007092199, 0.006387707, 0.005710453, 0.005059393, | | | 0.004433527, 0.003831864, 0.003253465, 0.00269744, 0.002162924, | | | 0.001649079, 0.001155109, 0.0006802468, 0.000223749 | +-----------------------+-------------------------------------------------------------------------+ | Heights above | 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, | | ground level | 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2250, 2500, 2750, | | (m; 33) | 3000, 3250, 3500, 3750, 4000, 4250, 4500, 4750, 5000 | +-----------------------+-------------------------------------------------------------------------+ | Heigts above | 250, 500, 750, 1000, 1250, 1500, 1750, 2000, 2250, 2500, 2750, | | mean sea level | 3000, 3250, 3500, 3750, 4000, 4250, 4500, 4750, 5000, 5250, 5500, | | (m; 40) | 6000, 6500, 7000, 7500, 8000, 9000, 10000, 11000, 12000, 13000, | | | 14000, 15000, 16000, 17000, 18000, 19000, 20000, 21000 | +-----------------------+-------------------------------------------------------------------------+ | Pressure levels | 925, 850, 700, 500, 400, 300, 250, 200, 150, 100, 70 | | (hPa; 11) | | +-----------------------+-------------------------------------------------------------------------+ Subset Categories ================= The following lists the different subset categories available to download. Each category link goes to a page listing the specific variables included in the subset. .. toctree:: :maxdepth: 0 file_descriptions_subset_aer file_descriptions_subset_cld file_descriptions_subset_cldhagl file_descriptions_subset_cldhamsl file_descriptions_subset_cldpres file_descriptions_subset_met file_descriptions_subset_methagl file_descriptions_subset_methamsl file_descriptions_subset_metpres file_descriptions_subset_metst file_descriptions_subset_pbl file_descriptions_subset_rad file_descriptions_subset_sfc file_descriptions_subset_stat file_descriptions_subset_tend file_descriptions_subset_trace