Interannual-to-decadal variability of the North Atlantic from an ocean data assimilation system

Masina, Simona; Pietro, Pierluigi Di; Navarra, Antonio

doi:10.1007/s00382-004-0453-6

Cited by 25 publications

(22 citation statements)

References 31 publications

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“…SST data came from the HadISST dataset (Rayner et al 2003). Ocean heat content (HC) data from 1958 to 1999 are taken from an ocean re-analysis product (Masina et al 2004). The HC is defined as the mean integrated temperature over the first 316 m ocean depth.…”

Section: Datamentioning

confidence: 99%

“…SSTA and HC data are taken from the ocean analysis by Masina et al (2004). Figure 4a is similar to that of Tomita and Yasunari (1996) (their Fig.…”

Section: The Spatial Distribution Of the Quasi-biennial Signaturementioning

confidence: 99%

“…The remaining years must belong to the type-II or other unidentified cases. (Masina et al 2004). Type-II events have been extensively discussed and described in Navarra et al (1999) and in .…”

Section: Appendix a Type-ii Casesmentioning

confidence: 99%

“…2b), and they appear to be crucial for the periodicity of the teleconnection between Asian rainfall and the eastern Pacific Navarra et al 1999). Analyzing JAS NINO3 SSTA in the ocean analysis (Masina et al 2004), we identified as type-II those years having anomalies less than 0.79 • C (corresponding to one standard deviation of the SST variability in that period), thus selecting nine events as shown in Table A1. This selection agrees with results from Navarra et al 1999 andMiyakoda et al 1999. …”

Section: Appendix a Type-ii Casesmentioning

confidence: 99%

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ENSO and Its Effects on the Atmospheric Heating Processes

Miyakoda

Cherchi

Navarra

et al. 2012

Journal of the Meteorological Society of Japan

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El Niño-Southern Oscillation (ENSO) is an important air-sea coupled phenomenon that plays a dominant role in the variability of the tropical regions. Observations, atmospheric and oceanic reanalysis datasets are used to classify ENSO and non-ENSO years to investigate the typical features of its periodicity and atmospheric circulation patterns. Among non-ENSO years, we have analyzed a group, called type-II years, with very small SST anomalies in summer that tend to weaken the correlation between ENSO and precipitation in the equatorial regions. A unique character of ENSO is studied in terms of the quasi-biennial periodicity of SST and heat content (HC) fields over the Pacific-Indian Oceans. While the SST tends to have higher biennial frequency along the Equator, the HC maximizes it into two centers in the western Pacific sector. The north-western center, located east of Mindanao, is strongly correlated with SST in the NINO3 region. The classification of El Niño and La Niña years, based on NINO3 SST and north-western Pacific HC respectively, has been used to identify and describe temperature and wind patterns over an extended-ENSO region that includes the tropical Pacific and Indian Oceans.The description of the spatial patterns within the atmospheric ENSO circulation has been extended to tropospheric moisture fields and low-level moisture divergence during November-December-January, differentiating the role of El Niño, when large amounts of condensational heat are concentrated in the central Pacific, from La Niña that tends to mainly redistribute heat to Maritime Continents and higher latitudes. The influence of the described mechanisms on equatorial convection in the context of the variability of ENSO on longer timescales for the end of the 20th century is questioned. However, the inaccuracy of the atmospheric reanalysis products in terms of precipitation and the shorter time length of more reliable datasets hamper a final conclusion on this issue.

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Section: Datamentioning

confidence: 99%

“…SSTA and HC data are taken from the ocean analysis by Masina et al (2004). Figure 4a is similar to that of Tomita and Yasunari (1996) (their Fig.…”

Section: The Spatial Distribution Of the Quasi-biennial Signaturementioning

confidence: 99%

Section: Appendix a Type-ii Casesmentioning

confidence: 99%

Section: Appendix a Type-ii Casesmentioning

confidence: 99%

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ENSO and Its Effects on the Atmospheric Heating Processes

Miyakoda

Cherchi

Navarra

et al. 2012

Journal of the Meteorological Society of Japan

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“…As one of the outcomes of the GSOP intercomparison, [25] compares the variability in state estimates from multi-decadal syntheses ( [11], [28], [29], [30], [31] [32], [33], [34], [35], [36], [37]). There is a large spread in the various estimates of some quantities such as global upper ocean heat and freshwater content (Fig.…”

Section: The Current Global Synthesis Effortsmentioning

confidence: 99%

Synthesis and Assimilation Systems - Essential Adjuncts to the Global Ocean Observing System

Rienecker

Awaji

Balmaseda

et al. 2010

Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society

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Impact of extreme CO2 levels on tropical climate: a CGCM study

2008

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A coupled general circulation model has been used to perform a set of experiments with high CO 2 concentration (2, 4, 16 times the present day mean value). The experiments have been analyzed to study the response of the climate system to strong radiative forcing in terms of the processes involved in the adjustment at the ocean-atmosphere interface. The analysis of the experiments revealed a non-linear response of the mean state of the atmosphere and ocean to the increase in the carbon dioxide concentration. In the 16 9 CO 2 experiment the equilibrium at the oceanatmosphere interface is characterized by an atmosphere with a shut off of the convective precipitation in the tropical Pacific sector, associated with air warmer than the ocean below. A cloud feedback mechanism is found to be involved in the increased stability of the troposphere. In this more stable condition the mean total precipitation is mainly due to large-scale moisture flux even in the tropics. In the equatorial Pacific Ocean the zonal temperature gradient of both surface and sub-surface waters is significantly smaller in the 16 9 CO 2 experiment than in the control experiment. The thermocline slope and the zonal wind stress decrease as well. When the CO 2 concentration increases by about two and four times with respect to the control experiment there is an intensification of El Nin ˜o. On the other hand, in the experiment with 16 times the present-day value of CO 2 , the Tropical Pacific variability weakens, suggesting the possibility of the establishment of permanent warm conditions that look like the peak of El Nin ˜o.

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Interannual-to-decadal variability of the North Atlantic from an ocean data assimilation system

Cited by 25 publications

References 31 publications

ENSO and Its Effects on the Atmospheric Heating Processes

ENSO and Its Effects on the Atmospheric Heating Processes

Synthesis and Assimilation Systems - Essential Adjuncts to the Global Ocean Observing System

Impact of extreme CO2 levels on tropical climate: a CGCM study

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