South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula
The present work aims to analyze the tropospheric circulation in the Southern Hemisphere (SH) associated with anomalously cold summers (ACS, Dec-Feb) in the period 1981-2010 over northernmost Antarctic Peninsula (AP). A quartile criterion is used to identify ACSs, and a wave-activity flux for statio...
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ftconicet:oai:ri.conicet.gov.ar:11336/197458 2023-10-09T21:47:14+02:00 South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula Ondas cuasi-estacionarias en el Pacífico sur y veranos fríos anómalos en el extremo norte de la Península Antártica Costa, Alfredo Jorge Agosta Scarel, Eduardo Andres application/pdf http://hdl.handle.net/11336/197458 eng eng Asociación Argentina de Geofísicos y Geodestas info:eu-repo/semantics/altIdentifier/url/http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-77442012000200002 http://hdl.handle.net/11336/197458 Costa, Alfredo Jorge; Agosta Scarel, Eduardo Andres; South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula; Asociación Argentina de Geofísicos y Geodestas; Geoacta; 37; 2; 9-2012; 73-82 1852-7744 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc/2.5/ar/ ANOMALOUSLY COLD SUMMERS QUASI-STATIONARY WAVES NORTHERNMOST ANTARCTIC PENINSULA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet 2023-09-24T19:56:14Z The present work aims to analyze the tropospheric circulation in the Southern Hemisphere (SH) associated with anomalously cold summers (ACS, Dec-Feb) in the period 1981-2010 over northernmost Antarctic Peninsula (AP). A quartile criterion is used to identify ACSs, and a wave-activity flux for stationary quasi-geostrophic (QG) eddies on a zonally varying basic flow is used as a diagnostic tool to study wave-train propagation from the Pacific Ocean. It is shown that the summer of 2010 was singularly cold, so this summer is studied separately from the ACS composites previous to 2010. The ACSs prior to 2010 are characterized by a Pacific-South American (PSA)-like quasi-stationary wave (QSW) train that extends barotropically through the troposphere up to the lower stratosphere. It is emanated from a region of anomalous convection in New Zealand and it is directed towards the South Pacific. The wave train leads to an anomalous stationary cyclone that is located to the northwest of the AP. The easterly wind anomalies induced by this local anomalous stationary cyclone together with higher cloudiness anomalies are found to be associated with ACS events over the northern AP. The 2010 cold summer not only shows an anomalous stationary cyclone to the northwest of the AP, but singularly also shows a mid-latitude anomalous anticyclone over the south-eastern South Pacific. From there, a shorter QSW regionally propagates towards southern South America. In this case there is no PSA-like wave structure crossing the South Pacific. The short regional QSW seems to emanate from a region of positive sea surface temperature (SST) anomalies in the middle of the southern South Pacific. The SST anomalies can be related to the generation of locally increased mean-flow baroclinicity. Hence, this QSW propagation is related to anomalous transient activity. In turn, these SST anomalies could be induced by a PSA-like QSW propagation during the previous spring (Sep-Nov) of 2009. El presente trabajo tiene como objetivo analizar la circulación ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antártica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Antarctic Peninsula Pacific New Zealand |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
ANOMALOUSLY COLD SUMMERS QUASI-STATIONARY WAVES NORTHERNMOST ANTARCTIC PENINSULA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
ANOMALOUSLY COLD SUMMERS QUASI-STATIONARY WAVES NORTHERNMOST ANTARCTIC PENINSULA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Costa, Alfredo Jorge Agosta Scarel, Eduardo Andres South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula |
topic_facet |
ANOMALOUSLY COLD SUMMERS QUASI-STATIONARY WAVES NORTHERNMOST ANTARCTIC PENINSULA https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The present work aims to analyze the tropospheric circulation in the Southern Hemisphere (SH) associated with anomalously cold summers (ACS, Dec-Feb) in the period 1981-2010 over northernmost Antarctic Peninsula (AP). A quartile criterion is used to identify ACSs, and a wave-activity flux for stationary quasi-geostrophic (QG) eddies on a zonally varying basic flow is used as a diagnostic tool to study wave-train propagation from the Pacific Ocean. It is shown that the summer of 2010 was singularly cold, so this summer is studied separately from the ACS composites previous to 2010. The ACSs prior to 2010 are characterized by a Pacific-South American (PSA)-like quasi-stationary wave (QSW) train that extends barotropically through the troposphere up to the lower stratosphere. It is emanated from a region of anomalous convection in New Zealand and it is directed towards the South Pacific. The wave train leads to an anomalous stationary cyclone that is located to the northwest of the AP. The easterly wind anomalies induced by this local anomalous stationary cyclone together with higher cloudiness anomalies are found to be associated with ACS events over the northern AP. The 2010 cold summer not only shows an anomalous stationary cyclone to the northwest of the AP, but singularly also shows a mid-latitude anomalous anticyclone over the south-eastern South Pacific. From there, a shorter QSW regionally propagates towards southern South America. In this case there is no PSA-like wave structure crossing the South Pacific. The short regional QSW seems to emanate from a region of positive sea surface temperature (SST) anomalies in the middle of the southern South Pacific. The SST anomalies can be related to the generation of locally increased mean-flow baroclinicity. Hence, this QSW propagation is related to anomalous transient activity. In turn, these SST anomalies could be induced by a PSA-like QSW propagation during the previous spring (Sep-Nov) of 2009. El presente trabajo tiene como objetivo analizar la circulación ... |
format |
Article in Journal/Newspaper |
author |
Costa, Alfredo Jorge Agosta Scarel, Eduardo Andres |
author_facet |
Costa, Alfredo Jorge Agosta Scarel, Eduardo Andres |
author_sort |
Costa, Alfredo Jorge |
title |
South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula |
title_short |
South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula |
title_full |
South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula |
title_fullStr |
South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula |
title_full_unstemmed |
South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula |
title_sort |
south pacific quasi-stationary waves and anomalously cold summers in the northernmost antarctic peninsula |
publisher |
Asociación Argentina de Geofísicos y Geodestas |
url |
http://hdl.handle.net/11336/197458 |
geographic |
Antarctic Antarctic Peninsula Pacific New Zealand |
geographic_facet |
Antarctic Antarctic Peninsula Pacific New Zealand |
genre |
Antarc* Antarctic Antarctic Peninsula Antártica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antártica |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-77442012000200002 http://hdl.handle.net/11336/197458 Costa, Alfredo Jorge; Agosta Scarel, Eduardo Andres; South Pacific quasi-stationary waves and anomalously cold summers in the northernmost Antarctic Peninsula; Asociación Argentina de Geofísicos y Geodestas; Geoacta; 37; 2; 9-2012; 73-82 1852-7744 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc/2.5/ar/ |
_version_ |
1779310171857616896 |