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Dear MITgcm support</div>
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I have a new problem in the temperature simulation, which I guess is associated with my external heat flux forcing. When I used hfluxfile, the temperature value is within the normal range, but a few ℃ lower than it should be. When I used sw, lw, atemp and aqh,
then temperature in the coastal area can go down to -20℃ (but the velocity is generally ok, as attached)，which is clearly wrong. My external forcing was downloaded from 3-hrs ERA5 data.</div>
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I checked the diagnostics, found that the latent heat flux is a few times larger than it should be; </div>
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Any help will be greatly appreciated.</div>
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FL</div>
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# m/s</div>
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precipfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_tp_3hrs_1993.bin',</div>
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# W/m2, downward positive</div>
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swdownfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_sw_3hrs_1993.bin',</div>
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# W/m2, downward positive</div>
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lwdownfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_lw_3hrs_1993.bin',</div>
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# K</div>
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atempfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_t2m_3hrs_1993.bin',</div>
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# kg/kg</div>
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aqhfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_spehum_3hrs_1993.bin',</div>
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# m/s</div>
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uwindfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_U10_3hrs_1993.bin',</div>
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# m/s</div>
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vwindfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_V10_3hrs_1993.bin',</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Fanglou Liao <fanglou.liao@unswalumni.com><br>
<b>Sent:</b> Wednesday, December 10, 2025 10:53 PM<br>
<b>To:</b> MITgcm Support <mitgcm-support@mitgcm.org><br>
<b>Subject:</b> Re: [MITgcm-support] unrealistic model results in a regional model</font>
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Dear MITgcm support</div>
<div class="x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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I have a new problem in the temperature simulation, which I guess is associated with my external heat flux forcing. When I used hfluxfile, the temperature value is within the normal range, but a few ℃ lower than it should be. When I used sw, lw, atemp and aqh,
then temperature in the coastal area can go down to -20℃ (but the velocity is generally ok, as attached)，which is clearly wrong. My external forcing was downloaded from 3-hrs ERA5 data.</div>
<div class="x_elementToProof" style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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I checked the diagnostics, found that the latent heat flux is a few times larger than it should be; </div>
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Any help will be greatly appreciated.</div>
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FL</div>
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# m/s</div>
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precipfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_tp_3hrs_1993.bin',</div>
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# W/m2, downward positive</div>
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swdownfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_sw_3hrs_1993.bin',</div>
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# W/m2, downward positive</div>
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lwdownfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_lw_3hrs_1993.bin',</div>
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# K</div>
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atempfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_t2m_3hrs_1993.bin',</div>
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# kg/kg</div>
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aqhfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_spehum_3hrs_1993.bin',</div>
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# m/s</div>
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uwindfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_U10_3hrs_1993.bin',</div>
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# m/s</div>
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vwindfile = '/mnt/disk_B/user/liaof/MITgcm/verification/NSCS_case_5/input/InputFiles/ERA5_V10_3hrs_1993.bin',</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Matthew Mazloff <mmazloff@ucsd.edu><br>
<b>Sent:</b> Tuesday, December 2, 2025 5:46 AM<br>
<b>To:</b> Fanglou Liao <fanglou.liao@unswalumni.com><br>
<b>Subject:</b> Re: [MITgcm-support] unrealistic model results in a regional model</font>
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<div style="line-break:after-white-space">Very glad you figured it out
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<div>Matt</div>
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<div>On Nov 29, 2025, at 4:30 PM, Fanglou Liao <fanglou.liao@unswalumni.com> wrote:</div>
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Hi Matt</div>
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I've solved the unphysical noisy problem. Thank you very much,</div>
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FL </div>
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<font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span class="x_x_Apple-converted-space"> </span>MITgcm-support <<a href="mailto:mitgcm-support-bounces@mitgcm.org">mitgcm-support-bounces@mitgcm.org</a>> on behalf of Fanglou Liao <<a href="mailto:fanglou.liao@unswalumni.com">fanglou.liao@unswalumni.com</a>><br>
<b>Sent:</b><span class="x_x_Apple-converted-space"> </span>Wednesday, November 26, 2025 5:10 PM<br>
<b>To:</b><span class="x_x_Apple-converted-space"> </span><a href="mailto:mitgcm-support@mitgcm.org">mitgcm-support@mitgcm.org</a><span class="x_x_Apple-converted-space"> </span><<a href="mailto:mitgcm-support@mitgcm.org">mitgcm-support@mitgcm.org</a>><br>
<b>Subject:</b><span class="x_x_Apple-converted-space"> </span>Re: [MITgcm-support] unrealistic model results in a regional model</font>
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Hi Matt</div>
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Thank you so much for your response. I've tried your advices, and found that U, V boundary conditions caused the noisy patterns and leading to unphysical results. Keeping only normal velocity (i.e., v=0 along the east boundary and u=0 along the south one;
T, S were kept) at the open boundaries does not solve the problem. I've also tried to "make the bathymetry flat in the normal direction for several (6) grid cells", but the noisy patterns still occured.</div>
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<pre class="x_x_x_elementToProof"><div class="x_x_x_elementToProof" style="text-align:left; text-indent:0px; white-space:pre-wrap; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">restoring sponge time was also tried as suggested.</div></pre>
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Best,</div>
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FL</div>
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<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span class="x_x_Apple-converted-space"> </span>MITgcm-support <<a href="mailto:mitgcm-support-bounces@mitgcm.org">mitgcm-support-bounces@mitgcm.org</a>>
on behalf of Fanglou Liao <<a href="mailto:fanglou.liao@unswalumni.com">fanglou.liao@unswalumni.com</a>><br>
<b>Sent:</b><span class="x_x_Apple-converted-space"> </span>Tuesday, November 25, 2025 9:38 PM<br>
<b>To:</b><span class="x_x_Apple-converted-space"> </span>MITgcm Support <<a href="mailto:mitgcm-support@mitgcm.org">mitgcm-support@mitgcm.org</a>><br>
<b>Subject:</b><span class="x_x_Apple-converted-space"> </span>[MITgcm-support] unrealistic model results in a regional model</font>
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Dear MITgcm support</div>
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I am a new MITgcm user. I am building a regional ocean model with mitgcm, and have some problems with the model results, which I guess are associated with the open boundaries (East and South). This model is of 0.03 deg, with initial (T, S, U, V) and open boundary
conditions are interpolated from CMEMS reanalysis (0.083 deg). The external forcing are from ERA5. The Δt = 45 seconds. The model results are unrealistic, with small-scale patterns appear (attached), and the SST even dropped below 0 after a few days. When
I closed the east and south boundaries, these problems disappeard. Could you please kindly help me check my files attached and give me some advices? </div>
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Thank you very much</div>
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FL</div>
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