The phrase "additional ground" is correct and usable in written English.
It can be used when referring to extra reasons or justifications for a particular argument or decision.
Example: "The committee found additional ground to support their decision after reviewing the new evidence."
Alternatives: "further basis" or "extra justification".
Powerful X-band radar on U.S. ships and additional ground radar track the missile from below.
The sea-anchored balloon can be simply flight-tested, since additional ground facilities and special flight operations are not necessary.
The results of this test flight refocused the project's efforts toward additional ground testing and analysis; a path to flight.
The British takeover of the airport would make it easier to fly reinforcements, and would enable the Americans to send their transports without additional ground support.
The willingness to discuss Russian government support on this one occasion could be an additional ground for exposure under the solicitation ban.
The agency Round the World Experts even offers customers a "Travel Butler", allowing travellers to change flight, make additional ground arrangements, or simply seek advice as they travel.
The bottom image delineates additional ground-based radar profiles (black dots) together with TanDEM-X surface elevation.
These differences underlie the need for additional ground-based AOD measurements aimed at validating satellite estimates in the Atacama Desert.
The activator ions introduce additional ground-state levels and excited-state levels of energies between those of the valence and the conduction band of the zinc sulfide.
While it has yet to undergo extensive renovations, the building is being used for artist residencies and additional ground-floor exhibition space, which the museum calls "Studio 231".
A second plan, estimated to cost $170 billion, would use additional ground-based interceptors to provide limited protection to the 47 largest cities of the United States and Canada.
