Results 1 to 10 of about 746 (167)

The Tropical Tropopause Layer 1960–2100 [PDF]

Atmospheric Chemistry and Physics, 2009
The representation of the Tropical Tropopause Layer (TTL) in 13 different Chemistry Climate Models (CCMs) designed to represent the stratosphere is analyzed. Simulations for 1960–2005 and 1980–2100 are analyzed.
A. Gettelman, T. Birner, V. Eyring, H. Akiyoshi, S. Bekki, C. Brühl, M. Dameris, D. E. Kinnison, F. Lefevre, F. Lott, E. Mancini, G. Pitari, D. A. Plummer, E. Rozanov, K. Shibata, A. Stenke, H. Struthers, W. Tian   +17 more
doaj   +11 more sources

Microphysical Properties of Tropical Tropopause Layer Cirrus. [PDF]

J Geophys Res Atmos, 2018
AbstractPervasive cirrus clouds in the tropical tropopause layer (TTL) play an important role in determining the composition of stratospheric air through dehydration of tropospheric air entering the stratosphere. This dehydration affects Earth's energy budget and climate, yet uncertainties remain regarding the microphysical processes that govern TTL ...
Woods S, Lawson RP, Jensen E, Bui TP, Thornberry T, Rollins A, Pfister L, Avery M.   +7 more
europepmc   +4 more sources

Temperature and tropopause characteristics from reanalyses data in the tropical tropopause layer [PDF]

Atmospheric Chemistry and Physics, 2020
The tropical tropopause layer (TTL) is the transition region between the well-mixed convective troposphere and the radiatively controlled stratosphere with air masses showing chemical and dynamical properties of both regions.
S. Tegtmeier, S. Tegtmeier, J. Anstey, S. Davis, R. Dragani, Y. Harada, I. Ivanciu, R. Pilch Kedzierski, K. Krüger, B. Legras, C. Long, J. S. Wang, K. Wargan, K. Wargan, J. S. Wright   +14 more
doaj   +9 more sources

The tropical tropopause inversion layer: variability and modulation by equatorial waves [PDF]

Atmospheric Chemistry and Physics, 2016
The tropical tropopause layer (TTL) acts as a transition layer between the troposphere and the stratosphere over several kilometers, where air has both tropospheric and stratospheric properties. Within this region, a fine-scale feature is located: the
R. Pilch Kedzierski, K. Matthes, K. Matthes, K. Bumke   +3 more
doaj   +2 more sources

Convective sources of trajectories traversing the tropical tropopause layer [PDF]

Atmospheric Chemistry and Physics, 2016
Transit properties across the tropical tropopause layer are studied using extensive forward and backward Lagrangian diabatic trajectories between cloud tops and the reference surface 380 K.
A.-S. Tissier, B. Legras
doaj   +5 more sources

Ice nucleation and dehydration in the Tropical Tropopause Layer. [PDF]

Proc Natl Acad Sci U S A, 2013
Optically thin cirrus near the tropical tropopause regulate the humidity of air entering the stratosphere, which in turn has a strong influence on the Earth’s radiation budget and climate. Recent high-altitude, unmanned aircraft measurements provide evidence for two distinct classes of cirrus formed in the tropical tropopause region: (i) vertically ...
Jensen EJ, Diskin G, Lawson RP, Lance S, Bui TP, Hlavka D, McGill M, Pfister L, Toon OB, Gao R.   +9 more
europepmc   +4 more sources

Water Vapor, Clouds, and Saturation in the Tropical Tropopause Layer. [PDF]

J Geophys Res Atmos, 2019
AbstractThe goal of this investigation is to understand the mechanism behind the observed high relative humidity with respect to ice (RHi) in the tropical region between ~14 km (150 hPa) and the tropopause, often referred to as the tropical tropopause layer (TTL). As shown by satellite, aircraft, and balloon observations, high (>80%) RHi regions are
Schoeberl MR, Jensen EJ, Pfister L, Ueyama R, Wang T, Selkirk H, Avery M, Thornberry T, Dessler AE.   +8 more
europepmc   +4 more sources

Tropical Tropopause Layer Cloud Properties from Spaceborne Active Observations

Remote Sensing, 2023
A significant part of clouds in the tropics appears over the tropopause due to intense convections and in situ condensation activity. These tropical tropopause layer (TTL) clouds not only play an important role in the radiation budget over the tropics ...
Siliang Lei, Xijuan Zhu, Yuxiang Ling, Shiwen Teng, Bin Yao   +4 more
doaj   +2 more sources

Transport of short-lived species into the Tropical Tropopause Layer [PDF]

Atmospheric Chemistry and Physics, 2012
We use NAME, a trajectory model, to investigate the routes and timescales over which air parcels reach the tropical tropopause layer (TTL). Our aim is to assist the planning of aircraft campaigns focussed on improving knowledge of such transport.
M. J. Ashfold, N. R. P. Harris, E. L. Atlas, A. J. Manning, J. A. Pyle   +4 more
doaj   +3 more sources

Observations of ozone-poor air in the tropical tropopause layer [PDF]

Atmospheric Chemistry and Physics, 2018
Ozonesondes reaching the tropical tropopause layer (TTL) over the west Pacific have occasionally measured layers of very low ozone concentrations – less than 15 ppbv – raising the question of how prevalent such layers are and how they are formed.
R. Newton, G. Vaughan, E. Hintsa, M. T. Filus, L. L. Pan, S. Honomichl, E. Atlas, S. J. Andrews, L. J. Carpenter   +8 more
doaj   +6 more sources