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AHI data assimilation doesn't emulate channels 1-6(actually channels 7-12)

sunhh

New member
Hi:
I can only assimilate 7-10 channels of AHI data with WRFDAV4.4.Himawari-8 AHI has 16 channels and WRFDA allows the assimilation of 10 IR channels (channels 7-16),But in the radiance_info/himawari-8-ahi.info it is written as channels 1-10. When entering assimilation, the background values for channels 1-6 are not simulated, resulting in data rejection for all channels 1-6, which I think is due to the difference in channel naming for the radiation transfer mode. I've tried crtm and rttov and the results are the same.
Can anyone gives me some help please, thanks in advance.

Here is himawari-8-ahi.info, 01_qcstat_himawari-8-ahi and a part of 01_oma_himawari-8-ahi.0000
1675223417326.png
1675223432672.png
1675223438770.png
 
Is the VIS band assimilation algorithm not developed?
VIS is not supported, but the 10 channels supported by WRFDA for Himawari-8 AHI are all IR channels.Write 1-10 channels in WRFDA, actually read 7-16 of channels.
 
hello sunhh
may i see your namelist.input, himawari-8.ahi.info, and ahi_info file?

i tried to assimilate himawari-8 and always got an error

Code:
At line 12012 of file da_radiance.f (unit = 26, file = 'radiance_info/himawari-8-ahi.info')
Fortran runtime error: End of file

Error termination. Backtrace:
#0  0x7f2072c23ad0 in ???
#1  0x7f2072c24649 in ???
#2  0x7f2072c2527f in ???
#3  0x7f2072e784ab in ???
#4  0x7f2072e7c275 in ???
#5  0x7f2072e7c3e3 in ???
#6  0x565437d80a37 in ???
#7  0x565437dff580 in ???
#8  0x5654376959e2 in ???
#9  0x565437023847 in ???
#10  0x56543706c1e1 in ???
#11  0x56543706c232 in ???
#12  0x565436feb25f in ???
#13  0x7f2072229d8f in __libc_start_call_main
    at ../sysdeps/nptl/libc_start_call_main.h:58
#14  0x7f2072229e3f in __libc_start_main_impl
    at ../csu/libc-start.c:392
#15  0x565436feb344 in ???
#16  0xffffffffffffffff in ???
 
hello sunhh
may i see your namelist.input, himawari-8.ahi.info, and ahi_info file?

i tried to assimilate himawari-8 and always got an error

Code:
At line 12012 of file da_radiance.f (unit = 26, file = 'radiance_info/himawari-8-ahi.info')
Fortran runtime error: End of file

Error termination. Backtrace:
#0  0x7f2072c23ad0 in ???
#1  0x7f2072c24649 in ???
#2  0x7f2072c2527f in ???
#3  0x7f2072e784ab in ???
#4  0x7f2072e7c275 in ???
#5  0x7f2072e7c3e3 in ???
#6  0x565437d80a37 in ???
#7  0x565437dff580 in ???
#8  0x5654376959e2 in ???
#9  0x565437023847 in ???
#10  0x56543706c1e1 in ???
#11  0x56543706c232 in ???
#12  0x565436feb25f in ???
#13  0x7f2072229d8f in __libc_start_call_main
    at ../sysdeps/nptl/libc_start_call_main.h:58
#14  0x7f2072229e3f in __libc_start_main_impl
    at ../csu/libc-start.c:392
#15  0x565436feb344 in ???
#16  0xffffffffffffffff in ???
ahi.zip is what you need. According to your error, I don't think you link the radiance_info folder.
 

Attachments

  • ahi.zip
    2 KB · Views: 14
i see that you use cv options=5. i using cv options=3 from wrfda does it matter?
cv3 works fine. As I said above, your erros is not providing the radiance_info/himawari-8-ahi.info file correctly.Checking your radiance_info and himawari-8-ahi.info path is what you should do now.
 
Well the problem is i already linked the folder radiance_info and edit the himawari-8-ahi.info to the folder. i tried to make new work dir and linked it again and its still the same. i tried to copy the himawari-8.ahi.info file to the work dir and its still the same. I'm new to radiance assimilation can you tell me how to fix it?


Screenshot (886).pngScreenshot (822).png
 
Hi:
I can only assimilate 7-10 channels of AHI data with WRFDAV4.4.Himawari-8 AHI has 16 channels and WRFDA allows the assimilation of 10 IR channels (channels 7-16),But in the radiance_info/himawari-8-ahi.info it is written as channels 1-10. When entering assimilation, the background values for channels 1-6 are not simulated, resulting in data rejection for all channels 1-6, which I think is due to the difference in channel naming for the radiation transfer mode. I've tried crtm and rttov and the results are the same.
Can anyone gives me some help please, thanks in advance.

Here is himawari-8-ahi.info, 01_qcstat_himawari-8-ahi and a part of 01_oma_himawari-8-ahi.0000
View attachment 8352
View attachment 8353
View attachment 8354
I initially found the problem. CRTM works fine, while RTTOV 1-6 channels do not simulate brightness temperature. I think this is the reason why wrfda is not consistent with rttov. WRFDA writes channels 7-16 as 1-10 and adapts crtm, while RTTOV does not adapted.
 
After the version update of WRFDAV4.5, the ahi assimilation related files have been modified. At present, WRFDA can assimilate the data of ahi 10 channels by using both RTTOV and CRTM, but there are still bugs. When using RTTOV, the himawari-8-ahi.info which in radiance_info needs to set the channel numbers to 1-10(first picture).But when using CRTM, the himawari-8-ahi.info needs to set the channel numbers to 7-16(secend picture).I hope this can help people in the future, and I also hope that WRFDA developers will notice this and fix bugs in time.
1685958684876.png
1685958703669.png
 
After the version update of WRFDAV4.5, the ahi assimilation related files have been modified. At present, WRFDA can assimilate the data of ahi 10 channels by using both RTTOV and CRTM, but there are still bugs. When using RTTOV, the himawari-8-ahi.info which in radiance_info needs to set the channel numbers to 1-10(first picture).But when using CRTM, the himawari-8-ahi.info needs to set the channel numbers to 7-16(secend picture).I hope this can help people in the future, and I also hope that WRFDA developers will notice this and fix bugs in time.
View attachment 9574
View attachment 9575
Thank you so much for your reminder, I have been struggling with this for a long time.
 
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