Jérǒme Donnadille

Noveltis (France)

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Jean‐Pierre Cammas

Observatoire des Sciences de l'Univers de la Réunion

Patrick Mascart

Laboratoire d'Aérologie

D. Lambert

Université de Toulouse

Nadia Fourrié

Université de Toulouse

Philippe Arbogast

Météo-France

DOMINIQUE LAMBERT

Robert Gall

NSF National Center for Atmospheric Research

Chantal Claud

Université Paris-Saclay

Béatrice Pouponneau

Météo-France

N. A. Scott

École Polytechnique

Cooperative Institutions

Centre National d'Études Spatiales

Centre National de la Recherche Scientifique

National Space Agency

Université de Toulouse

Laboratoire d'Aérologie

Météo-France

Université Toulouse III - Paul Sabatier

Observatoire Midi-Pyrénées

Centre National de Recherches Météorologiques

Hellenic Centre for Marine Research

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Cold air cyclogenesis study using potential vorticity inversion method

EGS - AGU - EUG Joint Assembly (2003)

D. Lambert Philippe Arbogast Jean‐Pierre Cammas Jérǒme Donnadille P. Mascart

Cyclogenesis

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Citations (0)

Dynamique d'altitude dans un cas de cyclogenèse au Nord du courant-jet polaire pendant Fastex : étude diagnostique et numérique

Jérǒme Donnadille

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A cold‐air cyclogenesis study using a potential vorticity inversion method

Quarterly Journal of the Royal Meteorological Society (2004)

D. Lambert Philippe Arbogast Jean‐Pierre Cammas Jérǒme Donnadille Patrick Mascart

Abstract A cold‐air cyclogenesis is studied using a potential vorticity (PV) inversion method. In this study, the method is coupled with the French spectral operational model ARPEGE which is initialized by four‐dimensional variational reanalyses. Sensitivity studies are performed for Intensive Observation Period 18 (IOP18) (low 44, 19–24 February 1997) of the Fronts and Atlantic Storm‐Track EXperiment (FASTEX). This event is one of the Type C cyclogeneses recently identified in the FASTEX dataset. The triggering role of a coherent tropopause disturbance on the cyclogenesis is discussed by comparing a reference forecast and a simulation in which the tropopause coherent structure is removed. Interactions between the atmospheric upper level and the cyclogenesis are found significant. A second important factor is the influence of the surface temperature. Evaluations of vertical motions for different surface temperature distributions show that the warmer the sea surface, the deeper the low. The location of the low with respect to the ice‐shelf limit is also an important factor. Copyright © 2004 Royal Meteorological Society

Cyclogenesis

Tropopause

Extratropical cyclone

10.1256/qj.03.37

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Citations (5)

FASTEX IOP 18: A very deep tropopause fold. I: Synoptic description and modelling

Quarterly Journal of the Royal Meteorological Society (2001)

Jérǒme Donnadille Jean‐Pierre Cammas Patrick Mascart DOMINIQUE LAMBERT Robert Gall

Tropopause

10.1256/smsqj.57702

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Citations (1)

The use of tovs observations for the identification of tropopause‐level thermal anomalies

Quarterly Journal of the Royal Meteorological Society (2000)

Nadia Fourrié Chantal Claud Jérǒme Donnadille Jean‐Pierre Cammas Béatrice Pouponneau

Abstract The evolution of tropopause‐level thermal patterns is generally not well represented by the conventional observational network, especially over the oceans. An alternative is provided by satellite observations which are global and frequent. In particular, from the TIROS‐N (Television Infra‐Red Observation Satellite) Operational Vertical Sounder (TOVS) which flies on‐board National Oceanic and Atmospheric Administration satellites, an estimate of the temperature of the lower stratosphere (TLS) can be derived using the Improved Initialization Inversion algorithm. In this study, the degree of reliability of TLS for describing tropopause‐level thermal structures and variations is examined. For three intensive observation periods (16, 17 and 18) of the Fronts and Atlantic Storm‐Track Experiment, conducted in January and February 1997 over the North Atlantic Ocean, TLS fields are described; their advantage, compared with the use of raw microwave data, is illustrated; TLS variations are also studied in connection with other dynamical variables which can be obtained by the French Action de Recherche Petite Echelle Grande Echelle operational model analysis. Finally, the suitability of TLS as a possible forecasting aid over mid‐oceanic regions is promoted.

Tropopause

Initialization

10.1002/qj.49712656513

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Citations (9)

A satellite ocean color observation operator system for eutrophication assessment in coastal waters

Journal of Marine Systems (2011)

Andrew Clive Banks Pascal Prunet Julien Chimot Pedro Pina Jérǒme Donnadille

SeaWiFS

Ocean color

Biogeochemical Cycle

10.1016/j.jmarsys.2011.11.001

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Citations (19)

The use of TOVS observations for the identification of tropopause-level thermal anomalies

Quarterly Journal of the Royal Meteorological Society (2000)

Nadia Fourrié Chantal Claud Jérǒme Donnadille Jean‐Pierre Cammas Béatrice Pouponneau

The evolution of tropopause-level thermal patterns is generally not well represented by the conventional observational network, especially over the oceans. An alternative is provided by satellite observations which are global and frequent. In particular, from the TIROS-N (Television Infra-Red Observation Satellite) Operational Vertical Sounder (TOVS) which flies on-board National Oceanic and Atmospheric Administration satellites, an estimate of the temperature of the lower stratosphere (TLS) can be derived using the Improved Initialization Inversion algorithm. In this study, the degree of reliability of TLS for describing tropopause-level thermal structures and variations is examined. For three intensive observation periods (16, 17 and 18) of the Fronts and Atlantic Storm-Track Experiment, conducted in January and February 1997 over the North Atlantic Ocean, TLS fields are described; their advantage, compared with the use of raw microwave data, is illustrated; TLS variations are also studied in connection with other dynamical variables which can be obtained by the French Action de Recherche Petite Echelle Grande Echelle operational model analysis. Finally, the suitability of TLS as a possible forecasting aid over mid-oceanic regions is promoted.

Tropopause

Initialization

10.1256/smsqj.56512

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Citations (2)

FASTEX IOP 18: A very deep tropopause fold. I: Synoptic description and modelling

Quarterly Journal of the Royal Meteorological Society (2001)

Jérǒme Donnadille Jean‐Pierre Cammas Patrick Mascart D. Lambert Robert Gall

Abstract The life cycle of a very deep tropopause fold (820 hPa) is documented with aircraft and ship observations during the Intensive Observing Period 18 of the Fronts and Atlantic Storm‐Track EXperiment (FASTEX). The initial setting involves a coherent tropopause disturbance and an associated Arctic tropopause fold. The confluence episode that results from the phasing up of the tropopause disturbance and a southern ridge, ends in the formation of an intense jet streak, the dynamics of which are associated with the development of a polar tropopause fold. A diagnostic analysis suggests that the final dramatic stratospheric intrusion is the consequence of the vertical superposition of the Arctic and polar tropopause folds. The Mesoscale Non‐Hydrostatic (Meso‐NH) model is used to discuss this hypothesis. Mixing of the passive stratospheric tracer within the marine boundary layer is investigated with sensitivity tests which unplug, in turn, the model physical parametrizations. Finally, upper‐level forcings associated with the development of the tropopause fold are investigated in detail in a companion paper.

Tropopause

Extratropical cyclone

10.1002/qj.49712757703

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Citations (15)

FASTEX IOP 18: A very deep tropopause fold. II: Quasi-geostrophic omega diagnoses

Quarterly Journal of the Royal Meteorological Society (2001)

Jérǒme Donnadille Jean‐Pierre Cammas Patrick Mascart DOMINIQUE LAMBERT

Tropopause

10.1256/smsqj.57703

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Citations (0)

FASTEX IOP 18: A very deep tropopause fold. II: Quasi‐geostrophic omega diagnoses

Quarterly Journal of the Royal Meteorological Society (2001)

Jérǒme Donnadille Jean‐Pierre Cammas Patrick Mascart D. Lambert

Abstract A set of two companion papers is dedicated to the documentation of the life cycle of a very deep tropopause fold (820 hPa) during the Intensive Observing Period 18 of the Fronts and Atlantic Storm‐Track EXperiment (FASTEX). In this second part, diagnoses of vertical motion using a Q‐vector partitioning in the natural coordinate system that follows the geostrophic wind are analysed. The partitioning allows the evaluation of vertical motions associated with forcing mechanisms such as confluence and diffluence, thermal advection by the horizontal geostrophic shear (shear advection) and curvature of the flow. The synoptic situation involves the formation of an intense upper‐level jet streak when an Arctic trough and a southern ridge move into phase with each other. Results assessed in the course of the tropopause‐fold life cycle show that subsiding vertical motions associated with each of the forcing mechanisms (confluence, shear advection and curvature) overlap on the cyclonic‐shear side of the entrance region of the jet streak. It is shown that an additional effect of shear advection over the confluence, a necessary ingredient for the development of deep tropopause folds in two‐dimensional contexts, takes place in the present case‐study. However, the forcing mechanisms that contribute mostly to subsiding vertical motions over the warm side of the upper‐level frontal zone (i.e. with a maximum frontogenetic effect) are, in order of importance, the shear advection and the curvature.

Tropopause

Streak

Frontogenesis

10.1002/qj.49712757704

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Citations (9)