Global barotropic response to a tropical forcing

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Published by National Aeronautics and Space Administration, National Technical Information Center, distributor in [Washington, DC, Springfield, Va .

Written in English

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Subjects:

  • Weather forecasting.

Edition Notes

Book details

StatementYuxia Zhang and James P. McGuirk.
SeriesNASA contractor report -- NASA CR-195256.
ContributionsMcGuirk, James P., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15397202M

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Get this from a library. Global barotropic response to a tropical forcing. [Yuxia Zhang; James P McGuirk; United States. National Aeronautics and Space Administration.]. The extratropical response to localized, low-frequency tropical forcing is examined using a linearized, non-divergent barotropic model on a sphere.

Zonal-mean basic states characterized by solid-body rotation or critical latitudes are by: By comparison, when forced in the same fashion, the composite response of the linear nondivergent barotropic vorticity equation has a global skill of and a northern midlatitude skill of Qualitatively, the response of the conventional model is similar to that of the GCM but the phasing of its midlatitude features is not as good a match as is the phasing of the empirical by: Abstract The extratropical response to localized, low-frequency tropical forcing is examined using a linearized, non-divergent barotropic model on a sphere.

Zonal-mean basic states characterized by Cited by:   A nonlinear barotropic model is used to diagnose the mechanisms that lead to nonlinearity in the responses to tropical forcing. The use of a barotropic model for this purpose is supported by the equivalent barotropic nature of the responses ( by: The results suggest the utility of empirical models of atmospheric dynamics in situations where estimates of the response to external forcing are needed or as a standard of comparison in efforts to make models based on physical principles more by: Atmospheric response patterns associated with tropical forcing are examined with general circulation models driven by global sea surface temperature (SST) variations during – Specifically the sensitivity of mid-latitude responses to the magnitude and position of tropical SST anomalies is explored.

This controversial. order to test the extra-tropical response to tropical forcing, we explore the mechanism in which eddies can reinforce the warm ridge along the western coast of North America.

Barotropic vorticity equation and linear insta-bility on a sphere A viscous two-dimensional incompressible rotating fluid on a unit sphere is governed by a non-linear. Rapid Arctic warming and sea-ice reduction in the Arctic Ocean are widely attributed to anthropogenic climate change.

The Arctic warming exceeds the global average warming because of feedbacks that include sea-ice reduction and other dynamical and radiative by: Shaping policy, business and finance in a time of crisis. On May, the Financial Times, in partnership with TNW, gathered the most senior global decision makers and leading minds in policy, business, tech and finance for three days of online conversations with top FT journalists.

Palaeoclimatic evidence of monsoon rainfall dynamics across different regions and timescales could help us to understand and predict the sensitivity and response of monsoons to various forcing mechanisms. This evidence suggests that monsoon systems exhibit substantial regional by: Near 13 day barotropic ocean response to the atmospheric forcing.

a global model. The wind-only forced barotropic model response to atmospheric forcing in the North Pacific. The. Changes of sea surface temperature and height, derived from 20‐day passive microwave and altimeter measurements for three tropical cyclones (TCs), Jimena, Ignacio and Kilo, during the Pacific hurricane season, sampling different stages of intensification, wind speeds, radii, Coriolis parameter, translation velocities, and ocean stratification conditions, are reported and : Vladimir Kudryavtsev, Anna Monzikova, Clément Combot, Bertrand Chapron, Nicolas Reul, Yves Quilfen.

Abstract. Recent GCM integrations with El Niño sea surface temperature anomalies are reviewed, and the question of whether the extratropical response Global barotropic response to a tropical forcing book be explained in terms of simple barotropic model dynamics is : T. Palmer. Solutions for the barotropic mode are remarkably good for speed-up factors of about 8 for the case of monthly forcing in a tropical ocean.

For high-frequency wind forcing, i.e. less than 30 days period, the oceanic response in mid-latitudes is essentially purely barotropic, but very weak compared to the response to seasonal by: 8. Motivated by some results from barotropic models, a linearized steady-state five-layer baroclinic model is used to study the response of a spherical atmosphere to thermal and orographic forcing.

Abstract Changes of sea surface temperature and height, derived from 20‐day passive microwave and altimeter measurements for three tropical cyclones (TCs), Jimena, Ignacio and Kilo, during the Author: Vladimir Kudryavtsev, Anna Monzikova, Clément Combot, Bertrand Chapron, Nicolas Reul, Yves Quilfen.

A numerical simulation has been performed using a linear barotropic model with tropical forcing and damping to check the extra-tropical response of the mechanism of eddies reinforcement of the.

Baroclinic Response of the Ocean to Wind Forcing: Use of Normal Modes Response of the Ocean to a Moving Storm or Hurricane Spin-Down by Bottom Friction Buoyancy Forcing Response to Stationary Forcing: A Barotropic Example A Forced Baroclinic Vortex Equilibration through Dissipative EffectsBook Edition: 1.

The atmospheric response to tropical heating is examined using both the linear, multilevel baroclinic model with an imposed tropical heat source, and the one-level barotropic model with a tropical. Baroclinity is proportional to: ∇ × ∇ which is proportional to the sine of the angle between surfaces of constant pressure and surfaces of constant density.

Thus, in a barotropic fluid (which is defined by zero baroclinity), these surfaces are parallel. imposed forcing neither adds nor subtracts heat from the global system. Thus, the forcing can be described completely by an implied ocean flux F 0 from one hemi-sphere to the other, with H • F 0.

Distributions of the heating/cooling (H) and associated heat flux (F 0) are plotted in Fig. We plot the tropical precipitation distribution with. Introduction [2] Tropical storms and hurricanes force strong current responses over relatively short timescales.

Since the generation and propagation of these storms is difficult to predict, most studies have utilized analytical and numerical models in conjunction with sparse observations to describe the structure of the current by: Seasonal wind forcing in the tropical Pacific directly affects SST and the surface and upper ocean currents (Figure ).

The cold tongue is strongest in August-September, during the period of strongest trade winds, accompanied by warmest temperatures in the warm pool; the west-east contrast is as much as 10°C. Waugh D. & Polvani L. & Plumb R. Nonlinear, barotropic response to a localized topographic forcing; formation of a ‘tropical surf zone’ and its effect on inter-hemispheric propagation.

Atmos. Sci. 51, – (). Tuck A. et al. The Brewer-Dobson circulation in the light of high altitude in situ aircraft observations Cited by: 7.

An ocean circulation's response to a change in wind stress forcing is through both barotropic and baroclinic planetary Rossby waves [Veronis and Stommel, ] and the ocean's adjustment toward an equilibrium state in a bounded ocean is through Kelvin and Rossby waves [Anderson and Gill, ].Cited by:   The examination of changes in tropical Pacific atmospheric circulation since the mid-nineteenth century using observations and a suite of global climate model experiments reveals a Cited by: North Atlantic Tropical Storm Frequency Response to Anthropogenic Forcing: Projections and Sources of Uncertainty GABRIELE VILLARINI Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey GABRIEL A.

VECCHI,THOMAS R. KNUTSON, AND MING ZHAO NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey. INTRODUCTION A recent review of the theory of stationary eddies in the extra-tropical troposphere by Held () has shown that the far-field response to large- scale forcing in the atmosphere is dominated by the external Rossby wave, in agreement with the numerical model solutions of Hoskins and Karoly (; hereafter referred to as HK).Cited by:   The mechanism is investigated by which extratropical thermal forcing with a finite zonal extent produces global impact.

The goal is to understand the near-global response to a weakened Atlantic meridional overturning circulation suggested by paleoclimate data and modeling studies.

An atmospheric model coupled to an aquaplanet slab mixed layer ocean, in which the unperturbed Cited by: Dr. Branstator's research interests have focused on problems in large scale atmospheric dynamics, and recently on the predictability of the coupled ocean-atmosphere system.

His work has helped shape the framework used by the scientific community to characterize the processes that organize midlatitude tropospheric variability on monthly.

Kasahara, A., The linear response of a stratified global atmoshere to tropical forcing. Submitted to J. Atmos. Sci. Google Scholar Lau, N.-C., The observed structure of tropospheric stationary waves and local balances of vorticity and : J.

Paegle, Zhao Zhen, Hong Yan, J. Paegle. Variations in the Earth's orbit are known to influence glacial cycles and consequently, global ice volume and the strength of oceanic mixing.

Sediment cores from the ocean floor are used to assess Cited by: Global patterns of internal tide generation reflect the product of barotropic tidal strength and topographic roughness, and resemble maps of deep-sea energy loss from the barotropic tide (Egbert and Ray, ; Jayne and St Laurent, ; Simmons et al., b).

Here we present support for a response of the El Niño/Southern Oscillation (ENSO) phenomenon6,7 to forcing from explosive volcanism by using two Cited by: Dynamics of the Extratropical Response to Tropical Heating K.

Kapper(1), supervised by N. Hall(2) (1) Wegener Center for Climate and Global Change (WegCenter) and Institute for Geophysics, Astrophysics and Meteorology, Inst.

of Physics, University of Graz, Austria (1) Laboratoire d’Etudes en Géophysique et. Robinson 5 Robinson, W. A., “Tradition, Tradition,” book review of Physics: Principles and Problems. In Bookwatch Reviews, Vol.

4, No. 6, published by File Size: KB. Global crop yield response to extreme heat stress under multiple climate change futures. Delphine Deryng 1,2, Declan Conway 3, Navin Ramankutty 4, Jeff Price 2 and Rachel Warren 1,2.

Published 19 March • IOP Publishing Ltd Environmental Research Letters, Volume 9, Number 3Cited by:   A strong (weak) East Asian summer monsoon (EASM) is usually concurrent with the tripole pattern of North Atlantic SST anomalies on the interannual timescale during summer, which has positive (negative) SST anomalies in the northwestern North Atlantic and negative (positive) SST anomalies in the subpolar and tropical ocean.

The mechanisms responsible for this linkage are Cited by:   Results and Discussion. Nearly all models agree that AEWs along the Sahel−Sahara border intensify in response to enhanced radiative forcing in the RCP pathway (Fig. 1 and Figs. S1, S2C, and S3).At mb, the maximum change is located between 15°N to 25°N and 15°E to 25°W, where, on average, the models exhibit a 25% increase in the JJAS mean variability of the filtered Cited by:.

UDC () Response of the Tropical Atmosphere to Local, Steady Forcing PETER J. WEBSTER ‘-Massachusetts Institute of Technology, Cambridge, Mass. ABSTRACT-A theoretical analysis is made of the large- scale, stationary, zonally asymmetric motions that result from heating and the orographic effect in the tropicalFile Size: 2MB.Publications in Refereed Scientific Journals and edited books.

La Nina-like mean-state response to global warming and potential oceanic roles. J. Dynamic Effects on Tropical Mean Cloud Radiative Forcing and Radiation Budget.

J. Climate, 21, PDF. Kubar, T.L. and D.L. Hartmann, The Vertical Structure of Tropical.Varying stratospheric responses to tropical Atlantic SS T forcing from early to late winter 1 3 mid-to-late winter, are nearly out-of-phase with a positiv e.

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