How ubiquitous is the dipole relationship in tropical atlantic sea surface temperatures

water temperature fluctuations of °C. In three cores from parameters buted here to the influence of the Atlantic sea surface tem-. Following the work of .. NO , L., , How ubiquitous is the dipole relationship in tropical. Atlantic sea. PDF | Several kinds of analysis are applied to the departures of sea surface temperatures from climatology (SSTA, ) to determine the degree to which. Enfield, D.B., A.M. Mestas-Nuñez, D.A. Mayer, and L. Cid-Serrano. How ubiquitous is the dipole relationship in tropical Atlantic sea surface temperature?.

Area-averages are always based on cosine of latitude weighting.

CLIVAR workshop on tropical Atlantic variability | Silvia Garzoli - misjon.info

The following calculations use linearly detrended data: For visual clarity, the Y-axis may differ amongst individual panels on a particular plot. Climatological means are zonally averaged over the globe. If calculated, the observational spectrum is overlaid in gray on each model spectrum. The spectra are displayed in variance-conserving form. A wavelet transform of the monthly nino3.

The following parameters are set: A Morlet wavelet is used with a wavenumber of 6. A chi-square test is applied for significance, with a threshold value of 0.

A Practical Guide to Wavelet Analysis. N-year running trends are computed by calculating the linear trend over the N-year interval beginning at each successive timestep.

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For instance, for a global timeseries that runs fromthe 8yr running trend value for January is the linear trend during January - Decemberand the value for January is the linear trend during January - December For example, for a timeseries that runs fromthe 30yr running standard deviation value for January is calculated over the period January December Area-weighted pattern correlations and rms differences are calculated between observations and each model simulation regridded to match the observational grid for 11 climate metrics.

The Total Score column shows the average of the 11 pattern correlations Z-transformed and rms differences. Entire domain shown If an eigenvalue is significantly seperated from neighboring values a star is appended to the percent variance explained on the plot. Significance is calculated following North et al.

The area of these grid cells is summed to create ice extent. For more information on observational datasets and climate indices, see the Climate Data Guide.

Temperatures are color shaded and in units of Celsius. Sea level pressure is contoured from to 16hPa by 2hPa; negative contours are dashed. Climate, 25,doi: Low pass-filtered timeseries black curve is based on a a month running mean. Sea surface temperature variability: These climate swings are directly or indirectly urations of SST anomalies on basin scales are not ubiquitous related to the tropical Atlantic region where surface temper- in the tropical Atlantic.

Unless the data are stratified by both ature variability and the associated changes in winds, sea season and frequency, inherent dipole behavior cannot be level pressure, intertropical convergence zone ITCZand demonstrated.

Upon removing the global ENSO signal in the Hadley circulation occur on interannual to decadal time SST anomaly from the data, the regions north or south of the scales. Non-dipole configurations that imply significant responses over the inter-American region that are comparable meridional SST anomaly gradients occur much more fre- to those of ENSO [Enfield, ].

The TAV is also associated quently, nearly half of the time. In addition key factors in driving the climate response in the tropical to the relation with the climate of the surrounding regions, Atlantic sector.

The temporal variability in the meridional understanding of the TAV is necessary to successfully vali- SST gradient across or south of the ITCZ has strong effects date the large-scale climate modes in numerical models [e. There Lau and Nath, ; Saravanan and Chang, ]. Studies attest to the role of positive feedback Atlantic [e. Wind fluctuations result in both local the western equatorial ocean.

Specifically, when the trades surface flux anomalies and in thermocline-depth variations intensify weaken in the western Atlantic, the equatorial that also modify the effect of the surface fluxes.

On the thermocline slope increases decreasesand negative pos- larger scale, recent research indicates that TAV is correlated itive SST anomalies develop in the eastern equatorial ocean, with the North Atlantic Oscillation NAO [Yang, ] and particularly in the Gulf of Guinea. The second mode, the therefore, directly or indirectly to the meridional overturn- ing circulation MOC.

Nor are the mechanisms for interhemi- mi, Florida, USA. In addition, there is not enough observational evidence at present to trace the time- This paper is not subject to U.

El Nino 2015: Sea Surface Temperature Anomaly

The line is occupied four times per year, in Atlantic. Nevertheless, many fundamental questions of different seasons [Goni and Baringer, ]. ARGO is an crucial importance for achieving predictability remain unan- international program whose goal is to deploy an array of swered. Modeling of the tropical Atlantic has not yet 3, free-drifting profiling floats in a period of five years.

The reasons Approximately floats will be operating in in the are, among others, the lack of observations and the poor Atlantic, of which about one third will be in the tropical understanding of the dynamics of the tropical Atlantic. The profiling floats measure the temperature and There is also a need to better define the predictability limits salinity of the upper to m of the ocean.

The Tropical Atlantic Observing System effort to expand and coordinate international observational [7] The oceanic in-situ data base in the Atlantic was programs in the tropical Atlantic towards a sustained observ- derived primarily during recent decades from volunteer ing system a meeting was held in Miami, May 4 through 7, observing ship VOS programs, coastal and island tide gauge http: As a fol- stations, and a small number of drifting buoys.

The main objectives of the Paris workshop especially in the Southern Hemisphere. Satellite estimates were to review advances in science since the Miami work- of some key variables surface winds, SST and sea level are shop, and to coordinate international efforts toward a sus- available over the whole Atlantic basin with more uniform tained observing system in support of understanding, spatial and temporal resolution.

How ubiquitous is the dipole relationship in tropical Atlantic sea surface tempe

Indeed, the satellites are modeling and predicting TAV. However, satellites do not deliver direct was attended by scientists from 10 different countries. The third morning was provides high-resolution time series measurements of surface dedicated to the observing system and to discuss observa- heat and moisture fluxes, sea surface temperature and salinity, tional needs for prediction.

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