Lost variables mue and mu0

[zhon...@gmail.com]

Hello,

I was trying to find the variables mue and mu0 used to store in ISCCP D1 now not retained. The official explanation is because values are stored as geophysical values now. Could you please help explain what does that mean and can I/how can I find the two variables at present for further study?

Thank you very much!

Xiang Zhong

[Ken Knapp - NOAA Federal]

Hi Xiang

ISCCP 'D1' data is now called HGG. We provide two types of HGG data:

Regular ISCCP HGG - All variables stored in the equal area arrays (more difficult to map)

Basic ISCCP HGG - Some variables stored in a 360x180 equal angle arrays (mapped).

The basic dataset does not have every variable, but a subset of the more prominent cloud parameters. If you do not see what you need in Basic ISCCP HGG, then you will need to access Regular ISCCP HGG. MUE and MU0 are in Regular ISCCP HGG.

The differences between ISCCP Basic and ISCCP Regular are described here:

https://www.ncdc.noaa.gov/isccp/isccp-data-access (the first table highlights the differences)

Access to ISCCP regular is here:

https://www.ncdc.noaa.gov/isccp/isccp-data-access#ISCCP%20Data

Unfortunately, you will need to order Regular ISCCP HGG. But there is a sample file online that should verify that this file has the MUE and MU0 variables that you are looking for.

ftp://filsrv.cicsnc.org/isccp/sample_files/hgg/ISCCP.HGG.v01r00.GLOBAL.2007.07.04.1800.GPC.10KM.CS00.EQ1.00.nc

I hope that this helps.

-Ken

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Ken Knapp, Ph.D.

Meteorologist, Center for Weather and Climate

NOAA National Centers for Environmental Information

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