{"action":"created","issue":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/390","repository_url":"https://api.github.com/repos/StrikeNP/trac_test","labels_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/390/labels{/name}","comments_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/390/comments","events_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/390/events","html_url":"https://github.com/StrikeNP/trac_test/issues/390","id":330445758,"node_id":"MDU6SXNzdWUzMzA0NDU3NTg=","number":390,"title":"Improve discretization of xp2_ta and wpxp_ta terms (Trac #390)","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":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},{"id":958019578,"node_id":"MDU6TGFiZWw5NTgwMTk1Nzg=","url":"https://api.github.com/repos/StrikeNP/trac_test/labels/enhancement","name":"enhancement","color":"a2eeef","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":4,"created_at":"2018-06-07T21:40:25Z","updated_at":"2018-06-08T22:55:06Z","closed_at":null,"author_association":"OWNER","body":"'''Introduction'''\n\nThe xp2_ta and wpxp_ta terms depend in part on Skw_velocity, which is noisy (ticket:386).  The noise in xp2_ta and wpxp_ta may have caused noise in rtm in our WRF-CLUBB simulation of VOCA (wrf:https://github.com/larson-group/clubb/issues/13).  \n\n'''Technical spec'''\n\nWe might be able to improve the discretization by \n\n1) using the same clipped and/or smoothed Skw_velocity in xp2_ta and wpxp_ta terms that we do for wp3_ta (ticket:386); or\n\n2) upwinding xp2_ta (wpxp_ta already has an upwind option (ticket:182)).\n\n'''Tests'''\n\nDo a plotgen of all cases at L48 using the code before and after the code changes. Repeat for L128 and standard grid spacing.  \n\nAttachments:\n\n\nMigrated from http://carson.math.uwm.edu/trac/clubb/ticket/390\n```json\n{\n    \"status\": \"closed\", \n    \"changetime\": \"2011-04-05T21:58:14\", \n    \"description\": \"'''Introduction'''\\n\\nThe xp2_ta and wpxp_ta terms depend in part on Skw_velocity, which is noisy (ticket:386).  The noise in xp2_ta and wpxp_ta may have caused noise in rtm in our WRF-CLUBB simulation of VOCA (wrf:comment:106:ticket:13).  \\n\\n'''Technical spec'''\\n\\nWe might be able to improve the discretization by \\n\\n1) using the same clipped and/or smoothed Skw_velocity in xp2_ta and wpxp_ta terms that we do for wp3_ta (ticket:386); or\\n\\n2) upwinding xp2_ta (wpxp_ta already has an upwind option (ticket:182)).\\n\\n'''Tests'''\\n\\nDo a plotgen of all cases at L48 using the code before and after the code changes. Repeat for L128 and standard grid spacing.  \", \n    \"reporter\": \"vlarson@uwm.edu\", \n    \"cc\": \"vlarson@uwm.edu\", \n    \"resolution\": \"wontfix\", \n    \"_ts\": \"1302040694000000\", \n    \"component\": \"clubb_src\", \n    \"summary\": \"Improve discretization of xp2_ta and wpxp_ta terms\", \n    \"priority\": \"major\", \n    \"keywords\": \"\", \n    \"time\": \"2011-01-09T22:34:43\", \n    \"milestone\": \"\", \n    \"owner\": \"dschanen@uwm.edu\", \n    \"type\": \"enhancement\"\n}\n```\n"},"comment":{"url":"https://api.github.com/repos/StrikeNP/trac_test/issues/comments/395913941","html_url":"https://github.com/StrikeNP/trac_test/issues/390#issuecomment-395913941","issue_url":"https://api.github.com/repos/StrikeNP/trac_test/issues/390","id":395913941,"node_id":"MDEyOklzc3VlQ29tbWVudDM5NTkxMzk0MQ==","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":"2018-06-08T22:55:06Z","updated_at":"2018-06-08T22:55:06Z","author_association":"OWNER","body":"Trac update at 2011/03/18 at 18:58\n\ndschanen@uwm.edu commented:\n\nReplying to [comment:4 vlarson@…]:\n> Can you figure out why upwinding xp2_ta reduces the oscillations in bomex and rico?  Perhaps something about the xp2_ta term is key to smoothing out these cases.  Is the rtp2_ta term still driving rtp2 toward zero?  This was part of the cause of the unwanted oscillations in ticket:389.\n\nIn the BOMEX case with the 48 level grid the dominant negative term in the rtp2 budget appears to rtp2_dp1, and the largest positive term is rtp2_tp.  The rtp2_ta term is generally negative from 1500m and lower and positive from 1500m to 3000m.  The shape and magnitude are about the same between the centered difference and upwind simulations, although the upwind case does look just a little bit smoother in the vertical.  Since the terms in the rtp2 budget are only around 10^-10^ in magnitude I wonder if roundoff might be a contributing factor in the sensitivity of our results.\n\n"}}
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