نتایج جستجو برای: troposphere
تعداد نتایج: 5309 فیلتر نتایج به سال:
Recent aircraft studies showed that new particle formation (NPF) is very active in the free troposphere. And, these observations lead to a new question: when does NPF not occur? Here, we provide case studies to show how different meteorological parameters affect NPF in the upper troposphere, using the aerosol size distributions measured at latitudes from 18 N–52 N and altitudes up to 14 km duri...
[1] The Tropospheric Emission Spectrometer (TES) is an infrared, high-resolution Fourier transform spectrometer which was launched onboard NASA’s Aura satellite in 2004 and is providing global, vertically resolved measurements of ozone in the troposphere. TES version 2 (V002) data profiles have been validated in the troposphere and lower stratosphere by way of comparison to ozonesondes and airc...
This study examines the characteristics of convective momentum transport (CMT) and gravity wave momentum transport (GWMT) in two-dimensional cloud-system-resolving model simulations, including the relationships between the two transports. A linear group velocity criterion is shown to objectively separate CMT andGWMT. TheGWMT contribution is mostly consistent with upward-propagating gravity wave...
5 The influence of clouds on the large-scale atmospheric circulation is examined in numerical 6 simulations from an atmospheric general circulation model run with and without atmospheric 7 cloud radiative effects (ACRE). 8 In the extratropics of both hemispheres, the primary impacts of ACRE on the circulation 9 include: 1) increases in the meridional temperature gradient and decreases in static...
The EOS (Earth Observing System) Aura Tropospheric Emission Spectrometer (TES) retrieves the atmospheric HDO /H2O ratio in the mid-to-lower troposphere as well as the planetary boundary layer. TES observations of water vapor and the HDO isotopologue have been compared with nearly coincident in situ airborne measurements for direct validation of the TES products. The field measurements were made...
Results from a new three-dimensional fractal model of sprites as well as recent experimental data on thundercloud charge moment changes associated with sprites indicate that ionized regions in sprites can sometimes reach thundercloud tops, creating favorable conditions for establishing a highly conducting link between the Earth’s surface and the lower ionosphere.
The impact of cirrus clouds on tropical troposphere-to-stratosphere transport T. Corti, B. P. Luo, Q. Fu, H. Vömel, and T. Peter Institute for Atmospheric and Climate Science, ETH Zurich, Switzerland Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA Received: 7 Dec...
The annual cycle of formaldehyde (HCHO) was measured at a remote site in Antarctica in order to investigate seasonal and diurnal variations as well as chemical processes in the troposphere. The measurements were performed in 1997 (March 1997 to January 1998) and in February 1999 at the German Antarctic research station Neumayer, which is located at 70¡37@S, 8¡22@W. The obtained time series for ...
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