Sentences with phrase «tropical tropopause»
The phrase "tropical tropopause" refers to a specific layer in the Earth's atmosphere, located near the tropics. It marks the boundary between the troposphere (the lower layer where weather occurs) and the stratosphere (the upper layer with a stable temperature). Full definition
The model is supported by observations from satellites, ground - based networks that measure ozone - depleting chemicals in the real world, and by observations from two decades of NASA aircraft field campaigns, including the most recent Airborne Tropical Tropopause Experiment (ATTREX) in 2013 and the Atmospheric Tomography (ATom) global atmospheric survey, which has made three deployments since 2016.
sciencedaily.com
Stratospheric water vapour comes from two sources — the uplift of tropospheric water through the very cold tropical tropopause (both as vapour and as condensate), and the oxidation of methane in the upper stratosphere (CH4 +2 O2 — > CO2 + 2H2O NB: this is just a schematic, the actual chemical pathways are more complicated).
Jensen, E.J., J.B. Smith, L. Pfister, J.V. Pittman, E.M. Weinstock, D.S. Sayres, R.L. Herman, R.F. Troy, K. Rosenlof, T.L. Thompson, A.M. Fridlind, P.K. Hudson, D.J. Cziczo, A.J. Heymsfield, C. Schmitt, and J.C. Wilson, 2005: Ice supersaturations exceeding 100 % at the cold tropical tropopause: Implications for cirrus formation and dehydration.
Jensen, E.J., L. Pfister, A.S. Ackerman, A. Tabazadeh, and O.B. Toon, 2001: A conceptual model of the dehydration of air due to freeze - drying by optically thin, laminar cirrus rising slowly across the tropical tropopause.
«ATTREX will perform a series of campaigns using NASA's long - range Global Hawk unmanned aircraft system to study cloud formations in the tropical tropopause.
«The ATTREX payload will provide unprecedented measurements of the tropical tropopause layer,» said Eric Jensen, ATTREX principal investigator at NASA's Ames Research Center in Moffett Field, Calif. «This is our first opportunity to sample the tropopause region during winter in the Northern Hemisphere when the region is coldest and extremely dry air enters the stratosphere.»
Jensen, E.J., A.S. Ackerman, and J.A. Smith, 2007: Can overshooting convection dehydrate the tropical tropopause layer?