Teleconnections, midlatitude cyclones and Aegean Sea turbulent heat flux variability on daily through decadal time scales

Romanski, J.; Romanou, Anastasia; Bauer, Michael; Tselioudis, George

doi:10.1007/s10113-013-0545-0

Cited by 7 publications

(8 citation statements)

References 50 publications

(85 reference statements)

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“…These bands of high wind speed are associated with mid-latitude winter storms (e.g. Romanski et al, 2014). Sudden reversal or change in wind direction is observed in all seasons between latitudes 15 • and 35 • in both hemispheres.…”

Section: Global Wind Distributionmentioning

confidence: 97%

Global tropospheric ozone variations from 2003 to 2011 as seen by SCIAMACHY

et al. 2016

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Abstract. An analysis of the tropospheric ozone (O 3 ) columns (TOCs) derived from SCIAMACHY limb-nadirmatching (LNM) observations during the period 2003-2011, focusing on global variations in TOC, is described. The changes are derived using a multivariate linear regression model. TOC shows changes of −0.2±0.4, 0.3±0.4, 0.1±0.5 and 0.1 ± 0.2 % yr −1 , which are not statistically significant at the 2σ level in the latitude bands 30-50 • N, 20 • S-0, 0-20 • N and 50-30 • S, respectively. Tropospheric O 3 shows statistically significant increases over some regions of South Asia (1-3 % yr −1 ), the South American continent (up to 2 % yr −1 ), Alaska (up to 2 % yr −1 ) and around Congo in Africa (up to 2 % yr −1 ). Significant increase in TOC is determined off the continents including Australia (up to 2 % yr −1 ), Eurasia (1-3 % yr −1 ) and South America (up to 3 % yr −1 ). Significant decrease in TOC (up to −3 % yr −1 ) is observed over some regions of the continents of North America, Europe and South America. Over the oceanic regions including the Pacific, North Atlantic and Indian oceans, significant decreases in TOC (−1 to −3 % yr −1 ) were observed. In addition, the response of the El Niño-Southern Oscillation (ENSO) and quasi-biennial oscillation (QBO) to changes in TOC for the period 2003-2011 was investigated. The result shows extensive regions, mostly in the tropics and Northern Hemisphere extratropics, of significant ENSO responses to changes in TOC and a significant QBO response to TOC changes over some regions.

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Section: Global Wind Distributionmentioning

confidence: 97%

Global tropospheric ozone variations from 2003 to 2011 as seen by SCIAMACHY

et al. 2016

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“…In particular, the links to regional atmospheric dynamics are most stable during winter (and early spring) when interannual variability of Mediterranean evaporation is mainly driven by the EA (in agreement with Josey et al () and ZH12) and EAWR teleconnections. Regarding the influence of the EAWR on the Mediterranean evaporation, our results are generally consistent with the findings of Romanski et al (, ) who detected a significant impact of the EAWR on the evaporation/heat fluxes variability in the eastern Mediterranean Sea. The largest intraseasonal and interdecadal changes in the links to atmospheric dynamics are revealed during autumn.…”

Section: Relation To Regional Atmospheric Dynamicsmentioning

confidence: 99%

Interdecadal changes in the links between Mediterranean evaporation and regional atmospheric dynamics during extended cold season

Zveryaev

Hannachi

2016

Intl Journal of Climatology

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Monthly evaporation data for 1958–2010 from the Woods Hole Oceanographic Institution dataset are used to investigate interdecadal changes in interannual variability of Mediterranean evaporation and its links to regional climate. Analysis performed for the two climate periods characterized by the downward (1958–1978) and upward (1979–2010) trends of evaporation revealed significant season‐dependent interdecadal changes in its interannual variability. The largest changes in interannual variability have been revealed during autumn when the leading empirical orthogonal functions (EOFs) are characterized by a zonal dipole pattern (except in November 1979–2010). During winter and spring, the EOF‐1 and EOF‐2 are characterized, respectively, by a monopole pattern and a zonal dipole and are associated with the East Atlantic (EA) and the East Atlantic–West Russia (EAWR) teleconnections. It is shown that interdecadal changes in interannual variability of Mediterranean evaporation during cold season were determined by the EA transition from the strongly negative to more neutral phase that occurred in late 1970s. Seasonally dependent changes in the structure of the leading evaporation EOFs reflect changing roles of the EA and EAWR which impact near surface air temperature, specific humidity and wind.

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“…On the other hand though, sea surface warming would enhance winter turbulent heat fluxes and increase cyclogenesis over the EMed basin. This according to Romanski et al [2014] would advect cold and dry air masses over the Aegean Sea and increase the likelihood of local DWF.…”

Section: Cretan Straits Exitmentioning

confidence: 99%

Dense intermediate water outflow from the Cretan Sea: A salinity driven, recurrent phenomenon, connected to thermohaline circulation changes

et al. 2014

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Data collected from different platforms in the Cretan Sea during the 2000s decade present evidence of gradually increasing salinity in the intermediate and deep intermediate layers after the middle of the decade. The observed gradual salt transport toward the deeper layers indicates contributions of dense water masses formed in various Aegean Sea subbasins. The accumulation of these saline and dense water masses in the Cretan Sea finally led to outflow from both Cretan Straits, with density greater than typical Levantine/Cretan Intermediate water but not dense enough to penetrate into the deep layers of the Eastern Mediterranean. We name this outflowing water mass as dense Cretan Intermediate Water (dCIW). A retrospective analysis of in situ data and literature references during the last four decades shows that similar events have occurred in the past in two occasions: (a) in the 1970s and (b) during the Eastern Mediterranean Transient (EMT) onset (1987)(1988)(1989)(1990)(1991). We argue that these salinity-driven Aegean outflows are mostly attributed to recurrent changes of the Eastern Mediterranean upper thermohaline circulation that create favorable dense water formation conditions in the Aegean Sea through salinity preconditioning. We identify these phenomena as ''EMT-like'' events and argue that in these cases internal thermohaline mechanisms dominate over atmospheric forcing in dense water production. However, intense atmospheric forcing over an already salinity preconditioned basin is indispensable for creating massive deep water outflow from the Cretan Sea, such as the EMT event.

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Teleconnections, midlatitude cyclones and Aegean Sea turbulent heat flux variability on daily through decadal time scales

Cited by 7 publications

References 50 publications

Global tropospheric ozone variations from 2003 to 2011 as seen by SCIAMACHY

Global tropospheric ozone variations from 2003 to 2011 as seen by SCIAMACHY

Interdecadal changes in the links between Mediterranean evaporation and regional atmospheric dynamics during extended cold season

Dense intermediate water outflow from the Cretan Sea: A salinity driven, recurrent phenomenon, connected to thermohaline circulation changes

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