How to download the complete data of the variable named hus1850 to 2014

K

Kitty

Guo kt
New Member
Hello,
I want to download the daily or monthly scale data of hus under the hist-aer experiment of CESM2, but I do not see the complete data from 1850 to 2014 officially. Are there other ways to obtain this data? Any suggestions on this would be helpful, thank you!
 
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A

asphilli

Adam Phillips
CVCWG Liaison
Staff member
Hello,
You are correct, there are a number of files missing for hus for monthly and daily timescales. I show that we submitted two members for hist-aer for CESM2: r1i1p1f1 and r3i1p1f1. Looking at monthly data, I show that we have the following files:
r1i1p1f1
hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_185001-189912.nc
hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_190001-194912.nc
hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_200001-201412.nc
r3i1p1f1
hus_Amon_CESM2_hist-aer_r3i1p1f1_gn_190001-194912.nc
hus_Amon_CESM2_hist-aer_r3i1p1f1_gn_195001-199912.nc

We do not have the capability to recreate and post the missing CMIP files. However, I can provide directions on how you can download CESM-timeseries files (on hybrid-sigma levels), and process the data to CMIP-timeseries format (on pressure levels).

Steps required:
1) Use this link to access our collection of CESM-formatted timeseries for hist-aer r1i1p1f1:
Globus

2) Scroll down until you see the following file:
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.001.cam.h0.Q.195001-199912.nc
Select and download that file.

3) To convert to pressure levels you will also need to download the surface pressure, so also download the following file:
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.001.cam.h0.PS.195001-199912.nc

4) Convert CESM timeseries Q file (on hybrid sigma levels) to pressure levels.
To do the interpolation for CMIP6 data, we used NCL's vinth2p function.

This NCL example shows you how to use vinth2p.
You would use vinth2p like this:
QonP = vinth2p(Q,hyam,hybm,pnew,PS,interp,P0mb,1,"False")

vinth2p options description
Q, hyam and hybm come from the first file.
pnew can be set to whatever pressure levels you wish to interpolate to.
PS comes from the second file above.
interp should be set to 2 (as it is in the example).
P0mb = 1000.
1 is an option that isn't used.
"False" refers to whether you want to interpolate below PS. For CMIP files we set this to "False".
----------------
Repeat for r3i1p1f1, accessing this globus link:
Globus

but download and process these files:
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.Q.185001-189912.nc
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.Q.200001-201412.nc
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.PS.185001-189912.nc
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.PS.200001-201412.nc

Hope this all helps!
Best,
Adam
 
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K

Kitty

Guo kt
New Member
asphilli said:
Hello, You are correct, there are a number of files missing for hus for monthly and daily timescales. I show that we submitted two members for hist-aer for CESM2: r1i1p1f1 and r3i1p1f1. Looking at monthly data, I show that we have the following files: r1i1p1f1 hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_185001-189912.nc hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_190001-194912.nc hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_200001-201412.nc r3i1p1f1 hus_Amon_CESM2_hist-aer_r3i1p1f1_gn_190001-194912.nc hus_Amon_CESM2_hist-aer_r3i1p1f1_gn_195001-199912.nc We do not have the capability to recreate and post the missing CMIP files. However, I can provide directions on how you can download CESM-timeseries files (on hybrid-sigma levels), and process the data to CMIP-timeseries format (on pressure levels). Steps required: 1) Use this link to access our collection of CESM-formatted timeseries for hist-aer r1i1p1f1: Globus 2) Scroll down until you see the following file: b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.001.cam.h0.Q.195001-199912.nc Select and download that file. 3) To convert to pressure levels you will also need to download the surface pressure, so also download the following file: b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.001.cam.h0.PS.195001-199912.nc 4) Convert CESM timeseries Q file (on hybrid sigma levels) to pressure levels. To do the interpolation for CMIP6 data, we used NCL's vinth2p function. This NCL example shows you how to use vinth2p. You would use vinth2p like this: QonP = vinth2p(Q,hyam,hybm,pnew,PS,interp,P0mb,1,"False") vinth2p options description Q, hyam and hybm come from the first file. pnew can be set to whatever pressure levels you wish to interpolate to. PS comes from the second file above. interp should be set to 2 (as it is in the example). P0mb = 1000. 1 is an option that isn't used. "False" refers to whether you want to interpolate below PS. For CMIP files we set this to "False". ---------------- Repeat for r3i1p1f1, accessing this globus link: Globus but download and process these files: b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.Q.185001-189912.nc b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.Q.200001-201412.nc b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.PS.185001-189912.nc b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.PS.200001-201412.nc Hope this all helps! Best, Adam
Click to expand...
asphilli said:
Hello,
You are correct, there are a number of files missing for hus for monthly and daily timescales. I show that we submitted two members for hist-aer for CESM2: r1i1p1f1 and r3i1p1f1. Looking at monthly data, I show that we have the following files:
r1i1p1f1
hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_185001-189912.nc
hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_190001-194912.nc
hus_Amon_CESM2_hist-aer_r1i1p1f1_gn_200001-201412.nc
r3i1p1f1
hus_Amon_CESM2_hist-aer_r3i1p1f1_gn_190001-194912.nc
hus_Amon_CESM2_hist-aer_r3i1p1f1_gn_195001-199912.nc

We do not have the capability to recreate and post the missing CMIP files. However, I can provide directions on how you can download CESM-timeseries files (on hybrid-sigma levels), and process the data to CMIP-timeseries format (on pressure levels).

Steps required:
1) Use this link to access our collection of CESM-formatted timeseries for hist-aer r1i1p1f1:
Globus

2) Scroll down until you see the following file:
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.001.cam.h0.Q.195001-199912.nc
Select and download that file.

3) To convert to pressure levels you will also need to download the surface pressure, so also download the following file:
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.001.cam.h0.PS.195001-199912.nc

4) Convert CESM timeseries Q file (on hybrid sigma levels) to pressure levels.
To do the interpolation for CMIP6 data, we used NCL's vinth2p function.

This NCL example shows you how to use vinth2p.
You would use vinth2p like this:
QonP = vinth2p(Q,hyam,hybm,pnew,PS,interp,P0mb,1,"False")

vinth2p options description
Q, hyam and hybm come from the first file.
pnew can be set to whatever pressure levels you wish to interpolate to.
PS comes from the second file above.
interp should be set to 2 (as it is in the example).
P0mb = 1000.
1 is an option that isn't used.
"False" refers to whether you want to interpolate below PS. For CMIP files we set this to "False".
----------------
Repeat for r3i1p1f1, accessing this globus link:
Globus

but download and process these files:
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.Q.185001-189912.nc
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.Q.200001-201412.nc
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.PS.185001-189912.nc
b.e21.B1850cmip6.f09_g17.DAMIP-hist-aer.003.cam.h0.PS.200001-201412.nc

Hope this all helps!
Best,
Adam
Click to expand...
Thank you for your guidance. I have attempted to carry out the data processing according to the description you provided above. Additionally, I have another question to ask. Are the monthly-scale data of variables such as "hus" and "ta" all obtained by averaging the daily averages on a monthly basis? This includes not only the daytime values but also the nighttime values. Rather than just the values during the day, or just the values at night.
 
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