{"action":"created","issue":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/386","repository_url":"https://api.github.com/repos/StrikeNP/trac_test","labels_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/386/labels{/name}","comments_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/386/comments","events_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/386/events","html_url":"https://github.com/StrikeNP/trac_test/issues/386","id":330445688,"node_id":"MDU6SXNzdWUzMzA0NDU2ODg=","number":386,"title":"Reduce frequency and magnitude of couplet spikes in wp3 (Trac #386)","user":{"login":"StrikeNP","id":2577059,"node_id":"MDQ6VXNlcjI1NzcwNTk=","avatar_url":"https://avatars0.githubusercontent.com/u/2577059?v=4","gravatar_id":"","url":"https://api.github.com/users/StrikeNP","html_url":"https://github.com/StrikeNP","followers_url":"https://api.github.com/users/StrikeNP/followers","following_url":"https://api.github.com/users/StrikeNP/following{/other_user}","gists_url":"https://api.github.com/users/StrikeNP/gists{/gist_id}","starred_url":"https://api.github.com/users/StrikeNP/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/StrikeNP/subscriptions","organizations_url":"https://api.github.com/users/StrikeNP/orgs","repos_url":"https://api.github.com/users/StrikeNP/repos","events_url":"https://api.github.com/users/StrikeNP/events{/privacy}","received_events_url":"https://api.github.com/users/StrikeNP/received_events","type":"User","site_admin":false},"labels":[{"id":958019852,"node_id":"MDU6TGFiZWw5NTgwMTk4NTI=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/Migrated%20from%20Trac","name":"Migrated from Trac","color":"FFFFFF","default":false},{"id":958042830,"node_id":"MDU6TGFiZWw5NTgwNDI4MzA=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/clubb_src","name":"clubb_src","color":"FFFFFF","default":false},{"id":958019855,"node_id":"MDU6TGFiZWw5NTgwMTk4NTU=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/defect","name":"defect","color":"FFFFFF","default":false},{"id":958042829,"node_id":"MDU6TGFiZWw5NTgwNDI4Mjk=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/dschanen@uwm.edu","name":"dschanen@uwm.edu","color":"FFFFFF","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":24,"created_at":"2018-06-07T21:40:09Z","updated_at":"2018-06-08T22:50:58Z","closed_at":null,"author_association":"OWNER","body":"'''Introduction'''\n\nWe have noticed for some time (see, e.g., http://carson.math.uwm.edu/trac/clubb/ticket/323#comment:15) that occasionally a couplet of spikes forms in wp3.  A zt grid point develops a large, positive spike of wp3, and the grid point above develops a large, negative spike.  At the zm level between, a large positive spike forms in wp2.\n\nAn example occurs at t=3771 (minutes) for the arm_97 case in r4931.  There wp3 goes from small sawtooth noise to values of +-100 in a single timestep.  wp3 is made positive by wp3_ta+wp3_tp (in particular the wp3(n+1) term), and wp2 is made positive by wp2_ta.  The sign of wp3 changes during the timestep at the altitudes of the couplet.  The sign change allows the derivative d(wp3(n)wp3(n+1))/dz to remain large.  Therefore, one might suspect that the sawtooth noise in wp3 is the problem and that smoothing wp3 is the solution.  However, the current discretization already uses wp3_zm, which is a smoothed version of wp3.\n\n'''Technical spec'''\n\nInitially, some additional diagnostics may help.  I think outputting wp3_zm and skewness_velocity = a1*wp3/wp2 may be useful (http://carson.math.uwm.edu/trac/clubb/ticket/182#comment:20).  \n\nLater, we should try new approaches, such as upwinding wp3_ta and wp3_tp, or smoothing skewness_velocity.\n\n'''Tests'''\n\n1.  We would like to prevent the formation any couplet of spikes in wp3 that reaches +-100 in any of our single-column cases, especially arm_97 and twp_ice.\n\n2.  We would like to simulate the VOCA case using WRF-CLUBB without crashes (https://github.com/larson-group/wrf/issues/13).  The crashes may be related to couplet of spikes in wp3.\n\nAttachments:\n\nhttp://carson.math.uwm.edu/trac/clubb/attachment/ticket/386/lwp.png\nhttp://carson.math.uwm.edu/trac/clubb/attachment/ticket/386/lwp_a1_in_deriv.png\n\nMigrated from http://carson.math.uwm.edu/trac/clubb/ticket/386\n```json\n{\n    \"status\": \"closed\", \n    \"changetime\": \"2011-07-27T21:35:58\", \n    \"description\": \"'''Introduction'''\\n\\nWe have noticed for some time (see, e.g., http://carson.math.uwm.edu/trac/clubb/ticket/323#comment:15) that occasionally a couplet of spikes forms in wp3.  A zt grid point develops a large, positive spike of wp3, and the grid point above develops a large, negative spike.  At the zm level between, a large positive spike forms in wp2.\\n\\nAn example occurs at t=3771 (minutes) for the arm_97 case in r4931.  There wp3 goes from small sawtooth noise to values of +-100 in a single timestep.  wp3 is made positive by wp3_ta+wp3_tp (in particular the wp3(n+1) term), and wp2 is made positive by wp2_ta.  The sign of wp3 changes during the timestep at the altitudes of the couplet.  The sign change allows the derivative d(wp3(n)wp3(n+1))/dz to remain large.  Therefore, one might suspect that the sawtooth noise in wp3 is the problem and that smoothing wp3 is the solution.  However, the current discretization already uses wp3_zm, which is a smoothed version of wp3.\\n\\n'''Technical spec'''\\n\\nInitially, some additional diagnostics may help.  I think outputting wp3_zm and skewness_velocity = a1*wp3/wp2 may be useful (http://carson.math.uwm.edu/trac/clubb/ticket/182#comment:20).  \\n\\nLater, we should try new approaches, such as upwinding wp3_ta and wp3_tp, or smoothing skewness_velocity.\\n\\n'''Tests'''\\n\\n1.  We would like to prevent the formation any couplet of spikes in wp3 that reaches +-100 in any of our single-column cases, especially arm_97 and twp_ice.\\n\\n2.  We would like to simulate the VOCA case using WRF-CLUBB without crashes (wrf:ticket:13).  The crashes may be related to couplet of spikes in wp3.\", \n    \"reporter\": \"vlarson@uwm.edu\", \n    \"cc\": \"vlarson@uwm.edu, bmg2@uwm.edu, ldgrant@uwm.edu\", \n    \"resolution\": \"Verified by V. Larson\", \n    \"_ts\": \"1311802558000000\", \n    \"component\": \"clubb_src\", \n    \"summary\": \"Reduce frequency and magnitude of couplet spikes in wp3\", \n    \"priority\": \"critical\", \n    \"keywords\": \"\", \n    \"time\": \"2010-12-27T18:19:31\", \n    \"milestone\": \"\", \n    \"owner\": \"dschanen@uwm.edu\", \n    \"type\": \"defect\"\n}\n```\n"},"comment":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/comments/395913215","html_url":"https://github.com/StrikeNP/trac_test/issues/386#issuecomment-395913215","issue_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/386","id":395913215,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NTkxMzIxNQ==","user":{"login":"StrikeNP","id":2577059,"node_id":"MDQ6VXNlcjI1NzcwNTk=","avatar_url":"https://avatars0.githubusercontent.com/u/2577059?v=4","gravatar_id":"","url":"https://api.github.com/users/StrikeNP","html_url":"https://github.com/StrikeNP","followers_url":"https://api.github.com/users/StrikeNP/followers","following_url":"https://api.github.com/users/StrikeNP/following{/other_user}","gists_url":"https://api.github.com/users/StrikeNP/gists{/gist_id}","starred_url":"https://api.github.com/users/StrikeNP/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/StrikeNP/subscriptions","organizations_url":"https://api.github.com/users/StrikeNP/orgs","repos_url":"https://api.github.com/users/StrikeNP/repos","events_url":"https://api.github.com/users/StrikeNP/events{/privacy}","received_events_url":"https://api.github.com/users/StrikeNP/received_events","type":"User","site_admin":false},"created_at":"2018-06-08T22:50:58Z","updated_at":"2018-06-08T22:50:58Z","author_association":"OWNER","body":"Trac update at 2011/01/10 at 21:58\n\nvlarson@uwm.edu commented:\n\nReplying to [comment:20 vlarson@…]:\n> Replying to [comment:18 dschanen@…]:\n> > I produced a coarse resolution (48 level momentum level grid) for all cases [http://www.larson-group.com/dschanen/protected/skw_vel_clipped_coarse_plot.maff here].  Some of the altocu cases have a severally truncated domain, probably because of how we determine which points are in the model domain when we have limited number of sounding points within the grid specified.\n> \n> On the whole, the results aren't too bad.  The time oscillations are diminished in astex_a209, LBA, RICO, but not in ATEX or arm_97 or twp_ice (?!).    The biggest problems are 1) There is no rain, snow, or cloud ice in arm_97.  Do you know why?  2) In astex_a209, there is a positive spike in wp2 and liquid at the end of the simulation. 3) In cloud_feedbacks_s12, the cloud has disappeared.  4) The surface rain_rate is too high in TWP-ICE (both with and without smoothing?).\n\nProblem 1) with arm_97 occurs both with and without smoothing; therefore, it is probably unrelated to smoothing (https://github.com/larson-group/clubb/issues/294).  Problem 4) with twp_ice occurs because the rain time series was output at every 5-minute timestep, instead of being averaged over an hour.   \n\n\n"}}
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