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The residence time of a fluid parcel is the total time that the parcel has spent inside a control volume (e.g.: a chemical reactor, a lake, a human body).The residence time of a set of parcels is quantified in terms of the frequency distribution of the residence time in the set, which is known as residence time distribution (RTD), or in terms of its average, known as mean residence time.
Ocean dynamics are governed by Newton's equations of motion expressed as the Navier-Stokes equations for a fluid element located at (x,y,z) on the surface of our rotating planet and moving at velocity (u,v,w) relative to that surface:
The lake retention time for a body of water with the volume 2,000 m 3 (71,000 cu ft) and the exit flow of 100 m 3 /h (3,500 cu ft/h) is 20 hours.. Lake retention time (also called the residence time of lake water, or the water age or flushing time) is a calculated quantity expressing the mean time that water (or some dissolved substance) spends in a particular lake.
The formation time scale is estimated to be 1 – 1.5 years based on observations by floating instruments and the residence time of NPIW is estimated to be about 20 years. Since the formation time is much less than the residence time, the properties of the NPIW may change on an annual basis as a result of the large changes in the Oyashio transport.
In today's Atlantic Ocean and current overturning circulation, 230 Th transport to the Southern Ocean is minimal due to its short residence time, and 231 Pa transport is high. This results in relatively low 231 Pa / 230 Th ratios found by McManus et al. [2004] in a core at 33N 57W, and a depth of 4.5 km.
[22] [23] However, the fast-moving Somali Current reduces the residence time of the upwelled nutrient-rich water, thus limiting biological productivity in this region somewhat. [24] A major part of this unutilized nutrient is transported to the southern Arabian Sea, supporting biological production there.
David Lynch revealed one of his biggest career regrets years before his death.. The celebrated director of Mulholland Drive, Blue Velvet and Twin Peaks died just days before his 79th birthday, his ...
A tidal prism is the volume of water in an estuary or inlet between mean high tide and mean low tide, [1] or the volume of water leaving an estuary at ebb tide. [2]The inter-tidal prism volume can be expressed by the relationship: P=H A, where H is the average tidal range and A is the average surface area of the basin. [3]