Search Results - "Birner, T."

Residual circulation trajectories and transit times into the extratropical lowermost stratosphere by Birner, T., Bönisch, H.

“…Transport into the extratropical lowermost stratosphere (LMS) can be divided into a slow part (time-scale of several months to years) associated with the…”
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Fine-scale structure of the extratropical tropopause region by Birner, T.

“…A vertically high resolved climatology of the thermal and wind structure of the extratropical tropopause region is presented. The climatology is based on data…”
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Flow‐Dependence of Ensemble Spread of Subseasonal Forecasts Explored via North Atlantic‐European Weather Regimes by Spaeth, J., Rupp, P., Osman, M., Grams, C. M., Birner, T.

“…Atmospheric prediction at 2–6 weeks lead time (so‐called subseasonal‐to‐seasonal timescales) entails large forecast uncertainty. Here we investigate the…”
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THE EXTRATROPICAL UPPER TROPOSPHERE AND LOWER STRATOSPHERE by Gettelman, A., Hoor, P., Pan, L. L., Randel, W. J., Hegglin, M. I., Birner, T.

“…The extratropical upper troposphere and lower stratosphere (Ex‐UTLS) is a transition region between the stratosphere and the troposphere. The Ex‐UTLS includes…”
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The effects of mixing on age of air by Garny, H., Birner, T., Bönisch, H., Bunzel, F.

“…Mean age of air (AoA) measures the mean transit time of air parcels along the Brewer‐Dobson circulation (BDC) starting from their entry into the stratosphere…”
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Quantifying the deep convective temperature signal within the tropical tropopause layer (TTL) by Paulik, L. C, Birner, T

“…Dynamics on a vast range of spatial and temporal scales, from individual convective plumes to planetary-scale circulations, play a role in driving the…”
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Quantifying the effects of mixing and residual circulation on trends of stratospheric mean age of air by Ploeger, F., Abalos, M., Birner, T., Konopka, P., Legras, B., Müller, R., Riese, M.

“…It is an outstanding issue to what degree trends in stratospheric mean age of air reflect changes in the (slow) residual circulation and how they are affected…”
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Significant Contributions of Volcanic Aerosols to Decadal Changes in the Stratospheric Circulation by Diallo, M., Ploeger, F., Konopka, P., Birner, T., Müller, R., Riese, M., Garny, H., Legras, B., Ray, E., Berthet, G., Jegou, F.

“…The stratospheric circulation is an important element of climate as it determines the concentration of radiatively active species like water vapor and aerosol…”
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Revisiting the Relationship among Metrics of Tropical Expansion by Waugh, D. W., Grise, K. M., Seviour, W. J. M., Davis, S. M., Davis, N., Adam, O., Son, S.-W., Simpson, I. R., Staten, P. W., Maycock, A. C., Ummenhofer, C. C., Birner, T., Ming, A.

“…There is mounting evidence that the width of the tropics has increased over the last few decades, but there are large differences in reported expansion rates…”
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Insights into Tropical Tropopause Layer processes using global models by Gettelman, A., Birner, T.

“…The climatology of the Tropical Tropopause Layer (TTL) in two state‐of‐the‐art general circulation models is compared with observations. Results indicate that…”
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Multimodel assessment of the upper troposphere and lower stratosphere: Tropics and global trends by Gettelman, A., Hegglin, M. I., Son, S.-W., Kim, J., Fujiwara, M., Birner, T., Kremser, S., Rex, M., Añel, J. A., Akiyoshi, H., Austin, J., Bekki, S., Braesike, P., Brühl, C., Butchart, N., Chipperfield, M., Dameris, M., Dhomse, S., Garny, H., Hardiman, S. C., Jöckel, P., Kinnison, D. E., Lamarque, J. F., Mancini, E., Marchand, M., Michou, M., Morgenstern, O., Pawson, S., Pitari, G., Plummer, D., Pyle, J. A., Rozanov, E., Scinocca, J., Shepherd, T. G., Shibata, K., Smale, D., Teyssèdre, H., Tian, W.

“…The performance of 18 coupled Chemistry Climate Models (CCMs) in the Tropical Tropopause Layer (TTL) is evaluated using qualitative and quantitative…”
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The tropopause inversion layer in models and analyses by Birner, T., Sankey, D., Shepherd, T. G.

“…Recent high‐resolution radiosonde climatologies have revealed a tropopause inversion layer (TIL) in the extratropics: temperature strongly increases just above…”
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Up-gradient eddy fluxes of potential vorticity near the subtropical jet by Birner, T., J. Thompson, D. W., Shepherd, T. G.

“…The role of eddy fluxes in the general circulation is often approached by treating eddies as (macro)turbulence. In this approach, the eddies act to diffuse…”
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Seasonal to multidecadal variability of the width of the tropical belt by Davis, N. A., Birner, T.

“…An expansion of the tropical belt has been extensively reported in observations, reanalyses, and climate model simulations, but there is a great deal of…”
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The Tropical Tropopause Layer 1960–2100 by Gettelman, A., Birner, T., Eyring, V., Akiyoshi, H., Bekki, S., Brühl, C., Dameris, M., Kinnison, D. E., Lefevre, F., Lott, F., Mancini, E., Pitari, G., Plummer, D. A., Rozanov, E., Shibata, K., Stenke, A., Struthers, H., Tian, W.

“…The representation of the Tropical Tropopause Layer (TTL) in 13 different Chemistry Climate Models (CCMs) designed to represent the stratosphere is analyzed…”
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Microphysical mesoscale simulations of polar stratospheric cloud formation constrained by in situ measurements of chemical and optical cloud properties by Larsen, N., Svendsen, S. Høyer, Knudsen, B. M., Voigt, C., Weisser, C., Kohlmann, A., Schreiner, J., Mauersberger, K., Deshler, T., Kröger, C., Rosen, J. M., Kjome, N. T., Adriani, A., Cairo, F., Di Donfrancesco, G., Ovarlez, J., Ovarlez, H., Dörnbrack, A., Birner, T.

“…A detailed microphysical model has been used to simulate polar stratospheric clouds (PSC) formed in mountain leewaves over northern Scandinavia and observed in…”
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Seasonal and inter-annual variability of lower stratospheric age of air spectra by Ploeger, Felix, Birner, Thomas

“…Trace gas transport in the lower stratosphere is investigated by analysing seasonal and inter-annual variations of the age of air spectrum – the probability…”
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Moist bias in the Pacific upper troposphere and lower stratosphere (UTLS) in climate models affects regional circulation patterns by Ploeger, Felix, Birner, Thomas, Charlesworth, Edward, Konopka, Paul, Müller, Rolf

“…Water vapour in the upper troposphere and lower stratosphere (UTLS) is a key radiative agent and a crucial factor in the Earth's climate system. Here, we…”
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On the pattern of interannual polar vortex–ozone co-variability during northern hemispheric winter by Harzer, Frederik, Garny, Hella, Ploeger, Felix, Bönisch, Harald, Hoor, Peter, Birner, Thomas

“…Stratospheric ozone is important for both stratospheric and surface climate. In the lower stratosphere during winter, its variability is governed primarily by…”
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Stratospheric modulation of Arctic Oscillation extremes as represented by extended-range ensemble forecasts by Spaeth, Jonas, Birner, Thomas

“…The Arctic Oscillation (AO) describes a seesaw pattern of variations in atmospheric mass over the polar cap. It is by now well established that the AO pattern…”
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