{"id":1578,"date":"2019-08-30T13:48:20","date_gmt":"2019-08-30T17:48:20","guid":{"rendered":"https:\/\/www2.whoi.edu\/site\/itp\/?page_id=1578"},"modified":"2021-07-20T12:15:04","modified_gmt":"2021-07-20T16:15:04","slug":"itp-21-data-processing","status":"publish","type":"page","link":"https:\/\/www2.whoi.edu\/site\/itp\/data\/completed-missions\/itp-21\/itp-21-data-processing\/","title":{"rendered":"ITP 021 Data Processing"},"content":{"rendered":"\r\n\t<h1>ITP21 Data Processing<\/h1>\r\n\t<p>The 831 profiles that were recovered from the ITP were processed according to the procedures described in\u00a0<a href=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/ITP_Data_Processing_Procedures_35803-1.pdf\">ITP Updated Data Processing Procedures<\/a>.\u00a0 The processing parameters for ITP 21 are shown in the figures to the right.\u00a0\u00a0<strong>Profiles 65 to 359 had excessive sensor lags (10 to 50 s for conductivity) due to either icing or biofouling and even with correction the salinities still contained great error so were discarded.\u00a0 The temperature sensor was less influenced and its lags were less (~6 s), correctable, and those profiles preserved, but include greater uncertainties than the remainder of the time series.<\/strong>\u00a0In general, ice motion was not too great, as to prevent profiling due to drag.\u00a0However, shortly after the CTD cleared (around profile 400) the profiler spring must have broke, because thereafter the vertical range of the profiles became gradually less on average, and zeroed around profile 800. During this time, the instrument was effectively slipping on the wire, and as a consequence the number of points removed where the profiler reversed was large.<\/p>\r\n<p>The sensors recovered very well after being fouled for 6 months.\u00a0 Except for the fouled period, the lags were typical and stable.\u00a0 In fact, recovery of the instrument allowed post calibrations to be performed on the CTD by the manufacturer.\u00a0 The temperature and conductivity sensors were within 0.001 of the pre-deployment calibrations.\u00a0 Also noteworthy, no profiler data files were missing in the record due to the reset software error which was corrected in the 2008 version of the profiler software.<\/p>\r\n<p>See the Data Products tab to the left for descriptions of the three levels (I, II, III) of data processing and to access all data.<\/p>\r\n\t\t\t\t<a href=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21loc2_261356.jpg\" target=\"_self\" rel=\"noopener noreferrer\">\r\n\t\t\t\t<img loading=\"lazy\" src=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21loc2_261356.jpg\" alt=\"ITP Surface Buoy Status\" height=\"1730\" width=\"1000\" title=\"itp21loc2_261356\" \/>\r\n\t\t\t\t<\/a>\r\n\t\tITP Surface Buoy Status\r\n\t\t\t\t<a href=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21dat1_261421.jpg\" target=\"_self\" rel=\"noopener noreferrer\">\r\n\t\t\t\t<img loading=\"lazy\" src=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21dat1_261421.jpg\" alt=\"ITP profiler engineering data.\" height=\"1480\" width=\"1560\" title=\"itp21dat1_261421\" \/>\r\n\t\t\t\t<\/a>\r\n\t\tITP profiler engineering data.\r\n\t\t\t\t<a href=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21final1_261435.jpg\" target=\"_self\" rel=\"noopener noreferrer\">\r\n\t\t\t\t<img loading=\"lazy\" src=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21final1_261435.jpg\" alt=\"Data\" height=\"5482\" width=\"4090\" title=\"itp21final1_261435\" \/>\r\n\t\t\t\t<\/a>\r\n\t\tTop: number of bad points removed, Middle: variance of verticle difference of temperature and salinity in step region for up-going profiles, Bottom: temperature lag.\r\n\t\t\t\t<a href=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21final3_261455.jpg\" target=\"_self\" rel=\"noopener noreferrer\">\r\n\t\t\t\t<img loading=\"lazy\" src=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21final3_261455.jpg\" alt=\"Data\" height=\"5474\" width=\"3997\" title=\"itp21final3_261455\" \/>\r\n\t\t\t\t<\/a>\r\n\t\tTop: conductivity lag, Middle: conductivity thermal mass amplitude correction, Bottom: conductivity thermal mass lag correction\r\n\t\t\t\t<a href=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21final3_261423.jpg\" target=\"_self\" rel=\"noopener noreferrer\">\r\n\t\t\t\t<img loading=\"lazy\" src=\"https:\/\/www2.whoi.edu\/site\/itp\/wp-content\/uploads\/sites\/92\/2019\/08\/itp21final3_261423.jpg\" alt=\"Data\" height=\"5420\" width=\"4066\" title=\"itp21final3_261423\" \/>\r\n\t\t\t\t<\/a>\r\n\t\tTop: down pressure deviation correction, Middle: salinity ratio adjustment, Bottom: Number of filtered spikes\r\n","protected":false},"excerpt":{"rendered":"<p>ITP21 Data Processing The 831 profiles that were recovered from the ITP were processed according to the procedures described in\u00a0ITP Updated Data Processing Procedures.\u00a0 The processing parameters for ITP 21 are shown in the figures to the right.\u00a0\u00a0Profiles 65 to 359 had excessive sensor lags (10 to 50 s for conductivity) due to either icing&hellip;<\/p>\n","protected":false},"author":83,"featured_media":0,"parent":1564,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"tpl-sidebar.php","meta":{"advanced-sidebar-menu\/link-title":"","advanced-sidebar-menu\/exclude-page":false},"_links":{"self":[{"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/pages\/1578"}],"collection":[{"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/users\/83"}],"replies":[{"embeddable":true,"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/comments?post=1578"}],"version-history":[{"count":3,"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/pages\/1578\/revisions"}],"predecessor-version":[{"id":3484,"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/pages\/1578\/revisions\/3484"}],"up":[{"embeddable":true,"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/pages\/1564"}],"wp:attachment":[{"href":"https:\/\/www2.whoi.edu\/site\/itp\/wp-json\/wp\/v2\/media?parent=1578"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}