Results 71 to 80 of about 34,894 (282)

Food Security Versus Environmental Health: The Nitrogen Dilemma

Journal of Plant Nutrition and Soil Science, EarlyView.
ABSTRACT Nitrogen is an essential element for plant growth and, consequently, crop production. However, the cycling of nitrogen in the environment can have negative effects. Here, we review the historical development of scientific and public awareness of these effects and the influence this has had on political action to control them.
Henrike Mielenz, Norbert Bischoff, Klaus Butterbach‐Bahl, Uwe Häußermann, Kurt‐Christian Kersebaum, Karin Rather, Burkhard Stever‐Schoo, Reinhard Well, Claas Nendel   +8 more
wiley   +1 more source

Northern winter stratospheric temperature and ozone responses to ENSO inferred from an ensemble of Chemistry Climate Models [PDF]

, 2009
The connection between the El Ni˜no Southern Oscillation (ENSO) and the Northern polar stratosphere has been established from observations and atmospheric modeling. Here a systematic inter-comparison of the sensitivity of the modeled stratosphere to ENSO
H. Struthers, Calvo, Natalia, Calvo Fernández, Natalia, Garny, Hella, E. Manzini, C. Cagnazzo, Douglass, A.R., M. Dameris, Chipperfield, Martyn P., Manzini, E. ; https://orcid.org/, Calvo, N., N. Calvo, Gettelman, A., Stenke, A., Akiyoshi, Hideharu, Garny, H., Deushi, M., Shepherd, Theodore G., M. Deushi, Giorgetta, M. A., Deushi, Makoto, D. Plummer, Giorgetta, Marco, Douglass, Anne, K. Shibata, H. Garny, E. Rozanov, Plummer, David, T. G. Shepherd, Akiyoshi, H., Manzini, E., Plummer, D.A., Struthers, Hamish, Chipperfield, M.P., Giorgetta, M.A., A. Douglass, M. A. Giorgetta, Manzini, Elisa, Shepherd, T., Dameris, Martin, Chipperfield, M., Douglass, A., M. Chipperfield, Bekki, Slimane, Tian, Wenshou, Giorgetta, M., Plummer, D., Tian, W., Dameris, M., Cagnazzo, C., Stenke, Andrea, H. Akiyoshi, Bekki, S., Cagnazzo, Chiara, Rozanov, Eugene, Gettelman, Andrew, A. Stenke, A. M. Fischer, Stenke, Andrea; id_orcid, W. Tian, Shibata, Kiyotaka, Shibata, K., Struthers, H., S. Bekki, Fischer, A. M., Fischer, A.M., Shepherd, T. G., Shepherd, T.G., Fischer, A., A. Gettelman, Rozanov, E.   +70 more
core   +2 more sources

Scaling turbulence drives the general circulation

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The NOAA Gulfstream SP4, which deployed the GPS dropsondes over the NE Pacific Ocean as part of the Winter Storms Project during the January–March periods of 2004, 2005 and 2006. Abstract Statistical multifractal analysis of airborne and dropsonde observations is used to show that persistence of velocity after molecular collisions breaks the continuous
Adrian F. Tuck
wiley   +1 more source

Tomographic reconstruction of atmospheric gravity wave parameters from airglow observations [PDF]

Atmospheric Measurement Techniques, 2017
Gravity waves (GWs) play an important role in the dynamics of the mesosphere and lower thermosphere (MLT). Therefore, global observations of GWs in the MLT region are of particular interest.
R. Song, R. Song, M. Kaufmann, J. Ungermann, M. Ern, G. Liu, M. Riese, M. Riese   +7 more
doaj   +1 more source

Stratospheric predictability and sudden stratospheric warming events [PDF]

Journal of Geophysical Research: Atmospheres, 2009
A comparative study of the limit of predictability in the stratosphere and troposphere in a coupled general circulation model is carried out using the National Center for Environmental Prediction (NCEP) Climate Forecast System Interactive Ensemble (CFSIE).
Cristiana Stan, David M. Straus
openaire   +1 more source

Spatial observation‐error correlations for AMSU‐A in all‐sky assimilation: An ECMWF and UK Met Office intercomparison

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Assimilation of AMSU‐A all‐sky observations can be increased up to fivefold if spatial observation‐error correlations are accounted for properly. New correlation estimates derived using data from ECMWF and the UK Met Office reveal that correlation length‐scales are between 75 and 150 km for AMSU‐A channels peaking in the troposphere. This is attributed
Rishabh Bhatt, Massimo Bonavita, Niels Bormann, Sarah L. Dance, Alison Fowler, Elías Hólm, Christopher J. Merchant, Jonathan Mittaz, Stuart Newman, Joanne Waller   +9 more
wiley   +1 more source

Three-dimensional tomographic reconstruction of atmospheric gravity waves in the mesosphere and lower thermosphere (MLT) [PDF]

Atmospheric Measurement Techniques, 2018
Gravity waves (GWs) have been intensively studied over recent decades because of their dominant role in the dynamics of the mesosphere and lower thermosphere (MLT).
R. Song, R. Song, M. Kaufmann, M. Ern, J. Ungermann, G. Liu, M. Riese, M. Riese   +7 more
doaj   +1 more source

Impact of Weak‐Constraint Four‐Dimensional Variational data assimilation on the prediction of a sudden stratospheric warming event in 2024

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The Weak‐Constraint Four‐Dimensional Variational (WC‐4DVAR) system markedly improved the analysis and forecasting of the 2024 sudden stratospheric warming (SSW) event. It reduced biases and enhanced 7–9 day predictions of temperature across the SSW life cycle, with the most pronounced gains for winds also during the critical onset period.
Shaoying Li, Weimin Zhang, Shuo Ma, Bainian Liu, Yanlai Zhao, Xiaoqun Cao   +5 more
wiley   +1 more source

A dynamics-based separation of deep and shallow stratospheric circulation branches [PDF]

Atmospheric Chemistry and Physics
The wave-driven Brewer–Dobson circulation plays a crucial role in determining the transport of trace gases and aerosols in the stratosphere. We examine the structure of the circulation based on reanalysis data (ERA5, ERA-Interim, MERRA2, and JRA55) and ...
R. Baikhadzhaev, F. Ploeger, F. Ploeger, P. Preusse, M. Ern, T. Birner, T. Birner   +6 more
doaj   +1 more source

First tomographic observations of gravity waves by the infrared limb imager GLORIA [PDF]

Atmospheric Chemistry and Physics, 2017
Atmospheric gravity waves are a major cause of uncertainty in atmosphere general circulation models. This uncertainty affects regional climate projections and seasonal weather predictions.
I. Krisch, P. Preusse, J. Ungermann, A. Dörnbrack, S. D. Eckermann, M. Ern, F. Friedl-Vallon, M. Kaufmann, H. Oelhaf, M. Rapp, M. Rapp, C. Strube, M. Riese, M. Riese   +13 more
doaj   +1 more source