Persian Gulf rain contributions, there is still a deficit of 416 cubic kilometers per year. This difference is supplied by currents at the Strait of Hormuz. The water from the Gulf has a higher salinity, and therefore exits from the bottom of the Strait, while ocean water with less salinity flows in through the top. Another study revealed the following numbers for water exchanges for the Gulf: evaporation = -1.84m/year, precipitation = 0.08m/year, inflow from the Strait = 33.66m/year, outflow from the Strait = -32.11m/year, and the balance is 0m/year. Data from different 3D computational fluid mechanics models, typically with spatial resolution
Gulf of Oman desert and semi-desert gravelly plains and savanna with thorny acacia trees inland with a background of the Musandam and Al Hajar mountains. The climate is hot and dry with temperatures up to 49 degrees Celsius (120 °F) and little rainfall, especially on the Persian Gulf coast of the UAE. There is more rainfall on the Gulf of Oman and humidity provides moisture on both coasts. The coastal mangrove consists of "Avicennia marina", trees of the inland savanna include "Ziziphus spina-christi", "Prosopis cineraria" and the Umbrella Thorn "Acacia tortilis" while the mountains are home to "Ficus cordata salicifolia", and "Acacia tortilis". Finally the traditional