How do you calculate mixed layer depth?
How do you calculate mixed layer depth?
- MLD in temperature with a fixed threshold criterion (0.2°C)
- MLD_DT02 = depth where (θ = θ10m ± 0.2 °C)
- MLD in density with a fixed threshold criterion (0.03kg/m3)
- MLD_DR003 = depth where(σ0 = σ010m+ 0.03 kg.m-3)
- MLD in density with a variable threshold criterion (equivalent to a 0.2°C decrease)
Why is there a seasonal difference in the depth of the surface mixed layer?
Its depth is generally of 50 to 100 metres in winter but it can reach several hundred metres in some regions. When temperature rises in spring and summer, the density at the surface decreases. As the winds also tend to be weaker in spring and summer, generating less mixing, the mixed layer becomes shallower.
What increases the mixed layer depth?
The surface mixed layer is a layer where this turbulence is generated by winds, surface heat fluxes, or processes such as evaporation or sea ice formation which result in an increase in salinity. The depth of the atmospheric mixed layer is known as the mixing height.
What is a well mixed layer?
A layer of air is well mixed if it has uniform properties. This can be thought of like an air mass. Air masses do not just exist at the surface but can exist aloft also. For example, in severe weather season there can be warm and moist air near the surface with warm and dry air aloft.
What mixes the water in the mixed layer?
Surface Ocean and Thermocline The mixed layer is defined as the layer in which there is active turbulence and mixing of oceanic waters due to winds, heat fluxes, evaporation, and salinity fluxes.
Which variables are constant in a mixed layer?
The mixed layer is a zone where turbulence, caused by surface currents and wind has so thoroughly mixed the water that temperature, density, and salinity are relatively constant throughout the layer.
What are three factors that determine the depth of mixing?
There are many factors that influence like wind, fluxes, currents, remote forcing variability of temperature, salinity , (E – P) and a combination of them. Also this varies based on the season and region too. If the regions experience high winds during a specific period it tends to deepen the MLD.
What is a mixed layer depth?
Mixed layer depth is often defined as the depth at which potential density differs from that of the surface by 0.01 kg m-1.
What is mixing depth?
mixing depth Measured from the surface of the Earth, the extent of an atmospheric layer (usually a sub-inversion layer) in which convection and turbulence lead to mixing of the air and of any pollutants in it. A Dictionary of Ecology. “mixing depth .”
What is the difference between the mixed layer and the thermocline?
The mixed layer is near the surface where the temperature is roughly that of surface water. In the thermocline, the temperature decreases rapidly from the mixed layer temperature to the much colder deep water temperature.
What is maximum mixing depth?
The depth of the convective mixing layer in which vertical movement of pollutants is possible, is called the maximum mixing depth (MMD).
How do you find the mixing height?
The morning mixing height is calculated as the height above ground at which the dry adiabatic extension of the morning minimum surface temperature plus 5°C intersects the vertical temperature profile observed at 12:00 Greenwich Mean Time.
