Clovis is training for the Olympic marathon team and decided to challenge himself by running in the mountains in Tibet. On the moming after he arrived, he hit the road for his run. About 20 minutes into his run, he started to get lightheaded and dizzy. He sat down at the side of the road. A short time later, a man stopped to see if he was okay and then transported Clovis to the hospital, where he was diagnosed with high altitude disease. What specific type of pH imbalance has Clovis developed?