Sentences with phrase «lowest ozone concentrations»
These maps show the state of the ozone hole each year on the day of maximum depth — the day the lowest ozone concentrations were measured.
https://earthobservatory.nasa.gov/ Not exact matches
Earth System Threshold Measure Boundary Current Level Preindustrial Climate Change CO2 Concentration 350 ppm 387 ppm 280 ppm Biodiversity Loss Extinction Rate 10 pm > 100 pm * 0.1 - one pm Nitrogen Cycle N2 Tonnage 35 mmt ** 121 mmt 0 Phosphorous Cycle Level in Ocean 11 mmt 8.5 - 9.5 mmt — 1 mmt Ozone Layer O3 Concentration 276 DU # 283 DU 290 DU Ocean Acidification Aragonite ^ ^ Levels 2.75 2.90 3.44 Freshwater Usage Consumption 4,000 km3 ^ 2,600 km3 415 km3 Land Use Change Cropland Conversion 15 km3 11.7 km3 Low Aerosols Soot Concentration TBD TBD TBD Chemical Pollution TBD TBD TBD TBD * pm = per million ** mmt = millions of metric tons #DU = dobson unit ^ km3 = cubic kilometers ^ ^ Aragonite is a form of calcium carbonate.
The region between 45 degrees N and 65 degrees N saw the lowest ever concentrations of total atmospheric ozone over the three continental regions of North America, Europe and Siberia in the winter - spring months of 1992 and 1993.
These show that just such a long - term decrease is taking place, and that there were unusually low values of ozone concentration in 1992 between latitudes 50 degrees North and 60 degrees North, covering Northern Europe, Russia and Canada.
In fact the average concentration of ozone is everywhere lower than the value that used to define the present ozone hole.
A. Ozone concentrations in the lower and middle stratosphere are in phase with the solar cycle, while in anti phase with the solar cycle in the upper stratosphere.
«What our study shows is that observed water vapor concentrations are high enough and temperatures are low enough over the U.S. in summertime to initiate the chemistry that is known to lead to ozone losses,» said Harvard atmospheric scientist David Wilmouth, one of the paper's co-authors, in an email.
Since a sustainable future based on the continued extraction of coal, oil and gas in the «business - as - usual mode» will not be possible because of both resource depletion and environmental damages (as caused, e.g., by dangerous sea level rise) we urge our societies to -LSB-...] Reduce the concentrations of warming air pollutants (dark soot, methane, lower atmosphere ozone, and hydrofluorocarbons) by as much as 50 % [and] cut the climate forcers that have short atmospheric lifetimes.
A drop in the concentration of ozone in the lower stratosphere should also produce a net cooling at the surface.
We all know there's a «hole» in the ozone layer — a section of the atmosphere over Antarctica where the concentration of ozone is a lot lower than it should be.
Ozone is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges, and is present in low concentrations throughout the Earth's atmosphere.
The caveat is that these molecules can weakly absorb sunlight in the near IR and visible on combination and overtone bands, mostly of water vapor, and on weakly absorbing forbidden transitions such as the Chappius bands of ozone, and for very low concentrations of dimers.
In an idealized three - dimensional numerical simulation of the Northern Hemisphere winter stratosphere, doubling the CO2 concentration leads to the formation of an Arctic ozone hole comparable to that observed over Antarctica, with nearly 100 % local depletion of lower - stratospheric ozone.