subaerial adjective. 
[sʌb'ɛ:rɪǝl] M19.[from SUB- 1 + AERIAL adjective.]Chiefly 
Geology & 
Physical Geography. Existing, occurring, or formed, in the open air or on the earth's surface, not under water or underground.
 ■   subaerially adverb L19.  [TahlilGaran] English Dictionary ▲