## Search found 9 matches

Fri Apr 05, 2024 2:04 pm America/New_York
Question: unit conversion of MERRA2 variabless
Replies: 2

### Re: unit conversion of MERRA2 variabless

As the variable name states, this is a concentration, not a flux or tendency. If you need the total time rate of change you can take the difference of the concentration at two points in time, then divide by the amount of time between the two points.
Tue Mar 12, 2024 2:37 pm America/New_York
Question: PM 2.5 unit conversion from kg/m3 to kg/m2
Replies: 4

### Re: PM 2.5 unit conversion from kg/m3 to kg/m2

I have data from merra 2 for sea salt mass concentration, the unit is kg/m3 , i need it in kg/m2 for my application. I like value for length scale which needs to multipled to it. How to find a length scale for specific location. Hi, I am assuming that you are using a variable SSSMASS25. The surface...
Tue Mar 12, 2024 2:33 pm America/New_York
Question: PM 2.5 unit conversion from kg/m3 to kg/m2
Replies: 4

### Re: PM 2.5 unit conversion from kg/m3 to kg/m2

dinesh_5497 wrote: Sat Mar 09, 2024 10:55 am America/New_York I have data from merra 2 for sea salt mass concentration, the unit is kg/m3 , i need it in kg/m2 for my application. I like value for length scale which needs to multipled to it. How to find a length scale for specific location.
Mon Dec 11, 2023 10:04 am America/New_York
Question: Merra2
Replies: 4

### Re: Merra2

If you read that carefully, you'll see that 60m is an approximate value. This is because the model uses a terrain following coordinate so that the thickness of the layers is a function of pressure. The variable HLML varies in latitude, longitude and time (space and time). This is why we provide the ...
Fri Dec 08, 2023 8:42 am America/New_York
Question: Merra2
Replies: 4

### Re: Merra2

Well, I'm not a chemistry expert either, but I learned unit conversions quite some time ago. Kg to mg, assuming that the constituent is the same in the conversion, then should just be a multiple of 10. I don't know how many powers of ten to tell you because its not clear if you want, milligram or mi...
Fri Oct 27, 2023 1:33 pm America/New_York
Question: Atmospheric enthalpy flux
Replies: 4

### Re: Atmospheric enthalpy flux

Take a look at this paper, it has a complete total energy budget discussion, with equations and also variable names in the appendix. The paper is MERRA, but most of that still holds for what is included in MERRA-2.
Thu Sep 10, 2020 8:06 am America/New_York
Question: Weather data
Replies: 4

### Re: Weather data

Hi, and thanks for your interest in MERRA-2 If you are not familiar with reanalyses methodology, please refer to our documentation and papers here: https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/docs/ In particular, while observations are used to guide the system, the reason we have data every where ...
Mon Jun 15, 2020 4:36 pm America/New_York
Question: MERRA-2 model vertical grid
Replies: 1

### Re: MERRA-2 model vertical grid

please email merra-questions@lists.nasa.gov and I can reply with the table of Ak/Bk coefficients.
Thu Apr 16, 2020 9:15 am America/New_York