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contributor authorRuggieri, Paolo
contributor authorKucharski, Fred
contributor authorNovak, Lenka
date accessioned2019-10-05T06:40:17Z
date available2019-10-05T06:40:17Z
date copyright2/15/2019 12:00:00 AM
date issued2019
identifier otherJCLI-D-18-0257.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263051
description abstractAbstractGiven the recent changes in the Arctic sea ice, understanding the effects of the resultant polar warming on the global climate is of great importance. However, the interaction between the Arctic and midlatitude circulation involves a complex chain of mechanisms, which leaves state-of-the-art general circulation models unable to represent this interaction unambiguously. This study uses an idealized general circulation model to provide a process-based understanding of the sensitivity of the midlatitude circulation to the location of high-latitude warming. A simplified atmosphere is simulated with a single zonally localized midlatitude storm track, which is analogous to the storm tracks in the Northern Hemisphere. It is found that even small changes in the position of the forcing relative to that storm track can lead to very different responses in the midlatitude circulation. More specifically, it is found that heating concentrated in one region may cause a substantially stronger global response compared to when the same amount of heating is distributed across all longitudes at the same latitude. Linear interference between climatological and anomalous flow is an important component of the response, but it does not explain differences between different longitudes of the forcing. Feedbacks from atmospheric transient eddies are found to be associated with this strong response. A dependence between the climatological jet latitude and the jet response to polar surface heating is found. These results can be used to design and interpret experiments with complex state-of-the-art models targeted at Arctic?midlatitude interactions.
publisherAmerican Meteorological Society
titleThe Response of the Midlatitude Jet to Regional Polar Heating in a Simple Storm-Track Model
typeJournal Paper
journal volume32
journal issue10
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-18-0257.1
journal fristpage2869
journal lastpage2885
treeJournal of Climate:;2019:;volume 032:;issue 010
contenttypeFulltext


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