نتایج جستجو برای: stratospheric ozone
تعداد نتایج: 24237 فیلتر نتایج به سال:
The Model for Ozone and Related chemical Tracers-2 (MOZART-2) is used to examine the evolution of pollutant O3 in the upper troposphere over the Indian region. Vertical profiles of ozone mixing ratio retrieved from Microwave Limb Sounder (MLS) aboard Earth Observing System (EOS) AURA satellite for the period 2005–2009 and Tropospheric Emission Spectrometer (TES) aboard (EOS) AURA for the period...
In August 1995, multiple instruments that measure the stratospheric ozone vertical distribution were intercompared at the Mauna Loa Observatory, Hawaii, under the auspices of the Network for the Detection of Stratospheric Change. The instruments included two UV lidar systems, one from the Jet Propulsion Laboratory and the other from Goddard Space Flight Center, electrochemical concentration cel...
[1] The effect of ozone depletion on temperature trends in the tropical lower stratosphere is explored with an atmospheric general circulation model, and directly contrasted to the effect of increased greenhouse gases and warmer sea surface temperatures. Confirming and extending earlier studies we find that, over the second half of the 20th Century, the model’s lower-stratospheric cooling cause...
The authors derive an empirical correlation between stratospheric ozone and potential vorticity from two sets of data, with PV from the 21-year WRF simulation and ozone from WOUDC radiosondes during the same period. Specifically, they fit the ratio of ozone to PV as an order-5 polynomial function of latitude and an order-2 polynomial function of pressure (height). The temporal fitting, represen...
[1] We explore the dependency of general circulation model tracer transports on model physics and horizontal and vertical resolution. We use NASA Goddard Institute for Space Studies (GISS) Model E at 4 5 with 20 and 23 layers and the GISS Global Climate Middle Atmosphere Model 3 at 4 5 with 23 and 53 layers and at 2 2.5 with 53 and 102 layers. The online tracers employed are CO2, CH4, N2O, CFC-...
The coupled climate-chemistry model ECHAM4.L39(DLR)/CHEM is presented which enables a simultaneous treatment of meteorology and atmospheric chemistry and their feedbacks. This is the first model which interactively combines a general circulation model with a chemical model, employing most of the important reactions and species necessary to describe the stratospheric and upper tropospheric ozone...
We describe the publicly available data from the Global OZone Chemistry And Related trace gas Data records for the Stratosphere (GOZCARDS) project and provide some results, with a focus on hydrogen chloride (HCl), water vapor (H2O), and ozone (O3). This data set is a global long-term stratospheric Earth system data record, consisting of monthly zonal mean time series starting as early as 1979. ...
Using a linear version of the ECMWF radiative transfer code it is possible to evaluate the impact of a prescribed ozone climatology on the stratospheric temperatures produced by climate models. So far referenced ozone climatologies have been derived by compilations and simple spatial interpolations of satellite and soundings data with rather coarse vertical resolutions and sometimes inhomogeneo...
The climate of the stratosphere is known to be subject to long-term changes induced by anthropogenic emissions of long-lived greenhouse gases (GHGs) as well as by emissions of ozone depleting substances (primarily chlorofluorocarbons, CFCs). Enhanced concentrations of CFCs have led to strong ozone depletion over the last decades. Thanks to the Montreal Protocol and its amendments and adjustment...
A transient model simulation of the 40-year time period 1960 to 1999 with the coupled climate-chemistry model (CCM) ECHAM4.L39(DLR)/CHEM shows a stratospheric water vapor increase over the last two decades of 0.7 ppmv and, additionally, a short-term increase after major volcanic eruptions. Furthermore, a long-term decrease in global total ozone as well as a short-term ozone decline in the tropi...
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