A comparison of two paradigms : The relative global roles of moist convective versus nonconvective transport
Identifieur interne : 000169 ( PascalFrancis/Corpus ); précédent : 000168; suivant : 000170A comparison of two paradigms : The relative global roles of moist convective versus nonconvective transport
Auteurs : P. G. HessSource :
- Journal of geophysical research [ 0148-0227 ] ; 2005.
Descripteurs français
- Pascal (Inist)
- Monde, Transport, Phénomène transport, Troposphère, Modèle, Ozone, Champ météorologique, Prévision, Chimie atmosphérique, Latitude, Traceur, Masse air, Convection, Simulation, Couche limite, Hémisphère Nord, Moyenne latitude, Variation saisonnière, Eté, Asie, Amérique du Nord, Transformation chimique.
English descriptors
- KwdEn :
- Air mass, Asia, Atmospheric chemistry, Chemical transformation, Meteorological field, Mid latitude, North America, Northern Hemisphere, Summer, Transport process, boundary layer, convection, global, latitude, models, ozone, prediction, seasonal variations, simulation, tracers, transport, troposphere.
Abstract
Global-scale transport processes are examined in the troposphere using the Model of Ozone and Related Trace Species, version 2 (MOZART-2). Here MOZART-2 is driven by input meteorological fields from the National Center for Environmental Prediction/ National Center for Atmospheric Chemistry (NCEP/NCAR) reanalysis data set during 2001-2002 filtered at approximately 2.8 degrees latitude by 2.8 degrees longitude. Idealized tracers are used to identify deep moist convectively processed airmasses in MOZART-2, where the convection is parameterized using the Zhang and McFarlane scheme. The simulations show that the troposphere can be divided into a convectively processed regime where deep moist convective transport is predominantly responsible for the transport of trace species from the boundary layer and a nonconvectively processed regime. The boundary between the convectively processed and nonconvectively processed regimes lies between approximately 300 and 310 K. The interplay between moist convective and nonconvective transport explains many aspects of the global tropospheric distribution of trace species, including seasonal, latitudinal and longitudinal changes in species distribution. Evidence is presented that transport in the warm conveyor belts of synoptic systems is the process primarily responsible for lofting trace species into the middle and upper troposphere in the nonconvectively processed regime. The Northern Hemisphere (N. H.) midlatitude troposphere undergoes a substantial seasonal cycle in convective influence with much greater convective impact during summer, primarily from convection north of 30°N. There is a barrier to poleward transport in the upper troposphere across 30°, even during the Northern Hemisphere summer. In specific applications the seasonal change in the transport regimes from Asia to North America is examined during the Intercontinental and Chemical Transformation 2002 (ITCT 2K2) campaign and the chemical consequences of convection are explored. An isentropic viewpoint is emphasized in this study. We use this viewpoint to explain the fact that poleward tracer gradients can be explained by transport considerations alone.
Notice en format standard (ISO 2709)
Pour connaître la documentation sur le format Inist Standard.
pA |
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Format Inist (serveur)
NO : | PASCAL 06-0011506 INIST |
---|---|
ET : | A comparison of two paradigms : The relative global roles of moist convective versus nonconvective transport |
AU : | HESS (P. G.) |
AF : | Atmospheric Chemistry Division, National Center for Atmospheric Research/Boulder, Colorado/Etats-Unis (1 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Journal of geophysical research; ISSN 0148-0227; Etats-Unis; Da. 2005; Vol. 110; No. D20; D20302.1-D20302.14; Bibl. 59 ref. |
LA : | Anglais |
EA : | Global-scale transport processes are examined in the troposphere using the Model of Ozone and Related Trace Species, version 2 (MOZART-2). Here MOZART-2 is driven by input meteorological fields from the National Center for Environmental Prediction/ National Center for Atmospheric Chemistry (NCEP/NCAR) reanalysis data set during 2001-2002 filtered at approximately 2.8 degrees latitude by 2.8 degrees longitude. Idealized tracers are used to identify deep moist convectively processed airmasses in MOZART-2, where the convection is parameterized using the Zhang and McFarlane scheme. The simulations show that the troposphere can be divided into a convectively processed regime where deep moist convective transport is predominantly responsible for the transport of trace species from the boundary layer and a nonconvectively processed regime. The boundary between the convectively processed and nonconvectively processed regimes lies between approximately 300 and 310 K. The interplay between moist convective and nonconvective transport explains many aspects of the global tropospheric distribution of trace species, including seasonal, latitudinal and longitudinal changes in species distribution. Evidence is presented that transport in the warm conveyor belts of synoptic systems is the process primarily responsible for lofting trace species into the middle and upper troposphere in the nonconvectively processed regime. The Northern Hemisphere (N. H.) midlatitude troposphere undergoes a substantial seasonal cycle in convective influence with much greater convective impact during summer, primarily from convection north of 30°N. There is a barrier to poleward transport in the upper troposphere across 30°, even during the Northern Hemisphere summer. In specific applications the seasonal change in the transport regimes from Asia to North America is examined during the Intercontinental and Chemical Transformation 2002 (ITCT 2K2) campaign and the chemical consequences of convection are explored. An isentropic viewpoint is emphasized in this study. We use this viewpoint to explain the fact that poleward tracer gradients can be explained by transport considerations alone. |
CC : | 220; 001E; 001E01 |
FD : | Monde; Transport; Phénomène transport; Troposphère; Modèle; Ozone; Champ météorologique; Prévision; Chimie atmosphérique; Latitude; Traceur; Masse air; Convection; Simulation; Couche limite; Hémisphère Nord; Moyenne latitude; Variation saisonnière; Eté; Asie; Amérique du Nord; Transformation chimique |
ED : | global; transport; Transport process; troposphere; models; ozone; Meteorological field; prediction; Atmospheric chemistry; latitude; tracers; Air mass; convection; simulation; boundary layer; Northern Hemisphere; Mid latitude; seasonal variations; Summer; Asia; North America; Chemical transformation |
SD : | Mundo; Transporte; Fenómeno transporte; Modelo; Ozono; Campo meteorológico; Previsión; Trazador; Masa aire; Convección; Simulación; Capa límite; Hemisferio norte; Latitud media; Variación estacional; Verano; Asia; America del norte; Transformación química |
LO : | INIST-3144.354000135086770150 |
ID : | 06-0011506 |
Links to Exploration step
Pascal:06-0011506Le document en format XML
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<term>Moyenne latitude</term>
<term>Variation saisonnière</term>
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<front><div type="abstract" xml:lang="en">Global-scale transport processes are examined in the troposphere using the Model of Ozone and Related Trace Species, version 2 (MOZART-2). Here MOZART-2 is driven by input meteorological fields from the National Center for Environmental Prediction/ National Center for Atmospheric Chemistry (NCEP/NCAR) reanalysis data set during 2001-2002 filtered at approximately 2.8 degrees latitude by 2.8 degrees longitude. Idealized tracers are used to identify deep moist convectively processed airmasses in MOZART-2, where the convection is parameterized using the Zhang and McFarlane scheme. The simulations show that the troposphere can be divided into a convectively processed regime where deep moist convective transport is predominantly responsible for the transport of trace species from the boundary layer and a nonconvectively processed regime. The boundary between the convectively processed and nonconvectively processed regimes lies between approximately 300 and 310 K. The interplay between moist convective and nonconvective transport explains many aspects of the global tropospheric distribution of trace species, including seasonal, latitudinal and longitudinal changes in species distribution. Evidence is presented that transport in the warm conveyor belts of synoptic systems is the process primarily responsible for lofting trace species into the middle and upper troposphere in the nonconvectively processed regime. The Northern Hemisphere (N. H.) midlatitude troposphere undergoes a substantial seasonal cycle in convective influence with much greater convective impact during summer, primarily from convection north of 30°N. There is a barrier to poleward transport in the upper troposphere across 30°, even during the Northern Hemisphere summer. In specific applications the seasonal change in the transport regimes from Asia to North America is examined during the Intercontinental and Chemical Transformation 2002 (ITCT 2K2) campaign and the chemical consequences of convection are explored. An isentropic viewpoint is emphasized in this study. We use this viewpoint to explain the fact that poleward tracer gradients can be explained by transport considerations alone.</div>
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<s5>19</s5>
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<s5>20</s5>
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<server><NO>PASCAL 06-0011506 INIST</NO>
<ET>A comparison of two paradigms : The relative global roles of moist convective versus nonconvective transport</ET>
<AU>HESS (P. G.)</AU>
<AF>Atmospheric Chemistry Division, National Center for Atmospheric Research/Boulder, Colorado/Etats-Unis (1 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of geophysical research; ISSN 0148-0227; Etats-Unis; Da. 2005; Vol. 110; No. D20; D20302.1-D20302.14; Bibl. 59 ref.</SO>
<LA>Anglais</LA>
<EA>Global-scale transport processes are examined in the troposphere using the Model of Ozone and Related Trace Species, version 2 (MOZART-2). Here MOZART-2 is driven by input meteorological fields from the National Center for Environmental Prediction/ National Center for Atmospheric Chemistry (NCEP/NCAR) reanalysis data set during 2001-2002 filtered at approximately 2.8 degrees latitude by 2.8 degrees longitude. Idealized tracers are used to identify deep moist convectively processed airmasses in MOZART-2, where the convection is parameterized using the Zhang and McFarlane scheme. The simulations show that the troposphere can be divided into a convectively processed regime where deep moist convective transport is predominantly responsible for the transport of trace species from the boundary layer and a nonconvectively processed regime. The boundary between the convectively processed and nonconvectively processed regimes lies between approximately 300 and 310 K. The interplay between moist convective and nonconvective transport explains many aspects of the global tropospheric distribution of trace species, including seasonal, latitudinal and longitudinal changes in species distribution. Evidence is presented that transport in the warm conveyor belts of synoptic systems is the process primarily responsible for lofting trace species into the middle and upper troposphere in the nonconvectively processed regime. The Northern Hemisphere (N. H.) midlatitude troposphere undergoes a substantial seasonal cycle in convective influence with much greater convective impact during summer, primarily from convection north of 30°N. There is a barrier to poleward transport in the upper troposphere across 30°, even during the Northern Hemisphere summer. In specific applications the seasonal change in the transport regimes from Asia to North America is examined during the Intercontinental and Chemical Transformation 2002 (ITCT 2K2) campaign and the chemical consequences of convection are explored. An isentropic viewpoint is emphasized in this study. We use this viewpoint to explain the fact that poleward tracer gradients can be explained by transport considerations alone.</EA>
<CC>220; 001E; 001E01</CC>
<FD>Monde; Transport; Phénomène transport; Troposphère; Modèle; Ozone; Champ météorologique; Prévision; Chimie atmosphérique; Latitude; Traceur; Masse air; Convection; Simulation; Couche limite; Hémisphère Nord; Moyenne latitude; Variation saisonnière; Eté; Asie; Amérique du Nord; Transformation chimique</FD>
<ED>global; transport; Transport process; troposphere; models; ozone; Meteorological field; prediction; Atmospheric chemistry; latitude; tracers; Air mass; convection; simulation; boundary layer; Northern Hemisphere; Mid latitude; seasonal variations; Summer; Asia; North America; Chemical transformation</ED>
<SD>Mundo; Transporte; Fenómeno transporte; Modelo; Ozono; Campo meteorológico; Previsión; Trazador; Masa aire; Convección; Simulación; Capa límite; Hemisferio norte; Latitud media; Variación estacional; Verano; Asia; America del norte; Transformación química</SD>
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