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Pregled bibliografske jedinice broj: 521573

Winter ENSO teleconnections in a warmer climate


Herceg Bulić, Ivana; Branković, Čedo; Kucharski, Fred
Winter ENSO teleconnections in a warmer climate // Workshop on Hierarchical Modeling of Climate
Trst, Italija, 2011. (poster, nije recenziran, neobjavljeni rad, znanstveni)


Naslov
Winter ENSO teleconnections in a warmer climate

Autori
Herceg Bulić, Ivana ; Branković, Čedo ; Kucharski, Fred

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Workshop on Hierarchical Modeling of Climate

Mjesto i datum
Trst, Italija, 18.-22. 07. 2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Winter atmospheric response; ENSO; warmer climate

Sažetak
Changes in the winter atmospheric response to sea surface temperature (SST) anomalies associated with the El Niño–Southern Oscillation (ENSO) in a warmer climate conditions are estimated from the two 20–member ensembles made by an atmospheric general circulation model of intermediate complexity. Warmer climate is simulated by a modification in the radiation parameterization that corresponds to the doubled CO2 concentration, and SST forcing is represented by the same SST anomalies as in current climate (1855–2002) experiment superimposed on the climatological SST that was obtained from a complex atmosphere–ocean general circulation model forced with the doubled CO2. SST anomalies in the Niño3.4 region, categorized into five classes, enabled a composite analysis of changes in the Northern Hemisphere tropical/extratropical teleconnections. The main features of the tropical–extratropical teleconnections are maintained in both experiments ; for example, irrespective of the sign of SST anomalies, the amplitude of the atmospheric response is positively correlated with the intensity of ENSO event and the El Niño impact is stronger than that of La Niña of the same intensity. The strongest extratropical signal in the warmer climate, particularly significant for strong warm events, is found over the Pacific/North American region ; however, this extratropical teleconnections is reduced in a warmer climate relative to the current climate. Over the North Atlantic/European region, a detectable signal linked to ENSO is found ; this model response is significantly strengthened in the experiment with the doubled CO2 concentration. Such an atmospheric response in a warmer climate is found to be associated with changes in the mean state followed as well as in the jet waveguiding effect and stationary wave activity.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Projekt / tema
001-0013077-1118 - Kooscilacije atmosfere i mora važne za ekosustav Jadrana (Mira Morović, )
004-1193086-3035 - Klimatske varijacije i promjene i odjek u područjima utjecaja (Marjana Gajić-Čapka, )
119-1193086-1323 - Kakvoća zraka nad kompleksnom topografijom (Zvjezdana Bencetić-Klaić, )

Ustanove
Državni hidrometeorološki zavod,
Prirodoslovno-matematički fakultet, Zagreb