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### New GCMD keywords for GRACE/GRACE-FO mission

Posted: Tue May 11, 2021 1:07 pm America/New_York
EARTH SCIENCE>OCEANS>OCEAN PRESSURE>OCEAN BOTTOM PRESSURE
Definition: the sum of the mass of the atmosphere and ocean in a "cylinder" above the seafloor.
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>OCEANS>OCEAN CIRCULATION>OCEAN MASS
Definition: the mass of the water in the ocean
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>OCEANS>SEA SURFACE TOPOGRAPHY>SEA LEVEL
Definition: an average level of the surface of Earth's oceans from which heights such as elevation may be measured.
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>SOLID EARTH>GRAVITY/GRAVITATIONAL FIELD>GRAVITY>GRAVITY ANOMALY
Definition: The difference between the measured gravity and the mean gravity over a period of time.
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS
Definition: The summation of all mass within ~20 km of the Earth’s surface (i.e. groundwater, soil moisture, surface water, snow, atmosphere) expressed on the surface of the Earth
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS>LIQUID WATER EQUIVALENT THICKNESS (LWET)
Definition: A unit of measurement of how thick a uniform layer of water at the surface of the Earth would need to be to account for an equivalent mass at the surface of the Earth.
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS>MASS TRANSPORT
Definition: The change in mass from one specified period of time to another specified period of time.
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS>MASS BALANCE
Definition: The definition of how the mass of an area changes over time; i.e. how balanced the mass is (e.g., whether processes that cause an increase mass, such as precipitation, are balanced with processes that cause mass loss, such as runoff and evaporation)
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>WATER BUDGET>TERRESTRIAL WATER STORAGE
Definition: The summation of all water on the land surface and in the subsurface. It includes surface soil moisture, root zone soil moisture, groundwater, snow, ice, water stored in the vegetation, rivers and lakes.
Rational: Physical parameter is generated directly or indirectly from GRACE/GRACE-FO missions.

EARTH SCIENCE>SERVICES>MODELS>SPHERICAL HARMONIC MODEL
Definition: An orthogonal set of basis functions to define the amplitudes at the surface of a sphere. It is often employed in solving partial differential equations in many scientific fields, and can be thought of as the 2D Fourier transform of a spatial grid.
Rational: The physical model used to produce the GRACE/GRACE-FO Level 2 datasets.

EARTH SCIENCE>SERVICES>MODELS> MASS CONCENTRATION (MASCON) MODEL
Definition: A basis function to define “blocks” of mass on the surface of a sphere or an ellipsoid, for GRACE(-FO) used as an alternative to spherical harmonics.
Rational: The physical model used to produce the GRACE/GRACE-FO Level 3 Mascon datasets.

### Re: New GCMD keywords for GRACE/GRACE-FO mission

Posted: Wed May 12, 2021 8:54 am America/New_York
@wenhaoli Thank you for your keyword request. We are currently reviewing them and will get back to you shortly. @wenhaoli can you please provide a reference URL for the keywords you suggested above

### Re: New GCMD keywords for GRACE/GRACE-FO mission

Posted: Fri May 14, 2021 9:20 am America/New_York
'EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY > GRAVITY ANOMALY',
'EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY ANOMALIES

Would that suffice for you?

### Re: New GCMD keywords for GRACE/GRACE-FO mission

Posted: Fri May 14, 2021 12:40 pm America/New_York
Yes, 'EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY ANOMALIES' is good.

### Re: New GCMD keywords for GRACE/GRACE-FO mission

Posted: Mon May 17, 2021 2:53 pm America/New_York
@wenhaoli These keywords have been added and they will be published with the next GCMD Keyword Release (Version 10.2) on Friday, May 28. As a reminder, please provide a reference URL for the keywords.

### Re: New GCMD keywords for GRACE/GRACE-FO mission

Posted: Mon May 17, 2021 3:10 pm America/New_York
Hi,

Good to hear. Thanks.
I am collecting the reference URL for the new keywords from GRACE Science team and will send over once I got them all.

Thanks,

Wenhao Li

### Re: New GCMD keywords for GRACE/GRACE-FO mission

Posted: Thu May 20, 2021 1:52 pm America/New_York
Hi,

Following are the reference URL for the GRACE(-FO) keywords.

EARTH SCIENCE>OCEANS>OCEAN PRESSURE>OCEAN BOTTOM PRESSURE
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_OCN_v03

EARTH SCIENCE>OCEANS>OCEAN CIRCULATION>OCEAN MASS
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_OCN_v03

EARTH SCIENCE>OCEANS>SEA SURFACE TOPOGRAPHY>SEA LEVEL
reference URL: https://podaac.jpl.nasa.gov/dataset/MER ... L_ASCII_V5

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_LND_v03

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS>LIQUID WATER EQUIVALENT THICKNESS (LWET)
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_LND_v03

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS>MASS TRANSPORT
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_LND_v03

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>SURFACE MASS>MASS BALANCE
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_LND_v03

EARTH SCIENCE>TERRESTRIAL HYDROSPHERE>WATER BUDGET>TERRESTRIAL WATER STORAGE
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... 06_LND_v03

EARTH SCIENCE>SERVICES>MODELS>SPHERICAL HARMONIC MODEL
reference URL: https://podaac.jpl.nasa.gov/dataset/GRA ... V_JPL_RL06

EARTH SCIENCE>SERVICES>MODELS> MASS CONCENTRATION (MASCON) MODEL
reference URL: https://podaac.jpl.nasa.gov/dataset/TEL ... ID_RL06_V2