<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Agree with Dimitris. Specifically I would try adding:<div class=""><br class=""></div><div class=""> useOBCStides = .TRUE.,<br class=""><br class=""><div>in data.obcs</div><div><br class=""></div><div><br class=""></div><div>Matt</div><div><br class=""></div><div><br class=""><blockquote type="cite" class=""><div class="">On Feb 26, 2021, at 4:34 AM, Dimitris Menemenlis <<a href="mailto:menemenlis@jpl.nasa.gov" class="">menemenlis@jpl.nasa.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Penyang, as a penance , I am trying to answer before your esteemed AWI colleague<div class="">but I don’t see anything wrong with the set-up that you describe below.<div class=""><div class=""><br class=""></div><div class="">I wonder if it would help to try and use as many of the options from</div><div class="">MITgcm/verification/seaice_obcs/code</div><div class="">MITgcm/verification/seaice_obcs/input.tides</div><div class="">initially, less the sea ice, to see if that fixes problem.</div><div class="">And then you can progress back, in steps, to your set-up.</div><div class=""><br class=""></div><div class="">D.</div><div class=""><br class=""></div><div class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Feb 26, 2021, at 1:08 AM, SONG Pengyang <<a href="mailto:Peterspy@outlook.com" class="">Peterspy@outlook.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">Dear MITgcm developers,</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">I am trying to setup an idealized 2D experiment with obcs package (e.g, Nx*Ny*Nr=500*1*30).</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">The idea is that I want to give a tidal component through the west bound as OBWAmFile (Am=0.1m/s) and OBWPhFile (Ph=0).</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">What I changed to codes are:</span></div><div style="margin: 0cm 0cm 0cm 18pt; text-align: justify; text-indent: -18pt; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class=""><span class="">(1)<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: "Times New Roman";" class=""> <span class="Apple-converted-space"> </span></span></span></span>“<span lang="EN-US" class="">#define ALLOW_OBCS_TIDES</span>”<span lang="EN-US" class=""><span class="Apple-converted-space"> </span>in OBCS_OPTIONS.h</span></div><div style="margin: 0cm 0cm 0cm 18pt; text-align: justify; text-indent: -18pt; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class=""><span class="">(2)<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: "Times New Roman";" class=""> <span class="Apple-converted-space"> </span></span></span></span>“<span lang="EN-US" class="">tidalComponents = 1</span>”<span lang="EN-US" class=""><span class="Apple-converted-space"> </span>in OBCS_PARAMS.h</span></div><div style="margin: 0cm 0cm 0cm 18pt; text-align: justify; text-indent: -18pt; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class=""><span class="">(3)<span style="font-style: normal; font-variant-caps: normal; font-weight: normal; font-stretch: normal; font-size: 7pt; line-height: normal; font-family: "Times New Roman";" class=""> <span class="Apple-converted-space"> </span></span></span></span>“<span lang="EN-US" class="">#define NONLIN_FRSURF</span>”<span class="Apple-converted-space"> </span><span lang="EN-US" class="">in CPP_OPTIONS.h</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">Data.obcs:</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">‘’’</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">&OBCS_PARM01</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">OB_Ieast=-1,</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">OB_Iwest=1,</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">OBWAmFile='OBWAm.bin',</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">OBWPhFile='OBWPh.bin',</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">tidalPeriod=43200.0,</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">&</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">‘’’</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">However, tidal signals are not found in the model result and the west and east two colomns of u are constant zeros.</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">No errors regarding to the I/O are reported, so I think the files I input are correct.</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">Is there any other changes I should do to the obcs? I.e., should I add sponge layer at the west bound and Orlansky condition at the east?</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">Kind regards,</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class="">Pengyang</span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-size: 12pt;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">----------------------------------------------------------------<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">SONG Pengyang</span><span style="" class="">（宋朋洋）</span><span lang="EN-US" style="font-family: "Times New Roman", serif;" class=""><o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">PhD candidate in Paleoclimate Dynamics<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">Department of Climate Sciences<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">Alfred Wegener Institute,<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">Helmholtz Centre for Polar and Marine Research<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">Address: Bussestr. 24, 27570 Bremerhaven, Germany<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">Tel: (+49) 471 4831 1811<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; font-family: DengXian;" class=""><span lang="EN-US" style="font-family: "Times New Roman", serif;" class="">Mobile: (+49) 17667211481 (DE)<o:p class=""></o:p></span></div><div style="margin: 0cm; text-align: justify; font-size: 10.5pt; 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