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Section P P index 1-9 of 747 terms
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P-E indexAbbreviation for precipitation-effectiveness index.
P–E ratioAbbreviation for precipitation–evaporation ratio.
p systemSee pressure coordinates.
Pacific Deep WaterA water mass found between 1000 and 3000 m in the Pacific Ocean. It is characterized by very sluggish flow and correspondingly low oxygen content. See deep water.
Pacific high(Or Pacific anticyclone.) The nearly permanent subtropical high of the North Pacific Ocean centered, in the mean, at 30°–40°N and 140°–150°W. On mean charts of sea level pressure, this high is a principal center of action.
Pacific–North American pattern(Abbreviated PNA pattern.) A wave-train signal that spans from the equatorial Pacific through the northwest of North America to the southeastern part of North America. This is the strongest teleconnection pattern of low-frequency variability of the atmospheric circulation in winter in response to changes in the sea surface temperature.
Pacific Subarctic CurrentSee Aleutian Current.
pack ice(Also called ice pack.) All sea ice other than fast ice; thus, sea ice that is capable of substantial motion and deformation.
packed towerA pollution control device for reducing (scrubbing) sulfur dioxide (SO2) emissions. This device consists of a column or tower that is packed with absorption material such as sodium or calcium carbonate, which removes the SO2 from the flue gas as it passes through the tower.
paesaA violent north-northeast wind of Lake Garda in Italy.
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