Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific
Previous studies proved that the East Asia summer monsoon circulation, such as monsoon trough (MT) and western Pacific subtropical high (WPSH) are closely correlated with tropical cyclone (TC) activity. Here, we emphasized that the excessive Chukchi-Beaufort (C-B) and Greenland (GL) sea ice sustains...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5017707 2023-10-29T02:33:45+01:00 Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific Zhang, P. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017707 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1880 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017707 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1880 2023-10-01T23:43:19Z Previous studies proved that the East Asia summer monsoon circulation, such as monsoon trough (MT) and western Pacific subtropical high (WPSH) are closely correlated with tropical cyclone (TC) activity. Here, we emphasized that the excessive Chukchi-Beaufort (C-B) and Greenland (GL) sea ice sustains from August to the following early autumn and triggers the southeastward propagation of the Rossby wave trains originating from the Arctic across Western Eurasia (Okhotsk Sea) to the western North Pacific (WNP). The resultant abnormal low pressure over WNP, implying a decreased WPSH, provides suitable environmental conditions for TC formation—the enhancement of the lower-level relative vorticity and water moisture, and the decrease of vertical wind shear. For the reduced sea ice, an opposite situation tends to emerge. The persistent combined sea ice signal makes it a physically meaningful precursor for TCF prediction. The cross-validated hindcast and independent forecast based on both the tropical SST and the Arctic sea ice precursors present that the TCF index is predicted with much higher correlation coefficients than the empirical models with only the tropical SST predictors. The results demonstrate that the Arctic sea ice indeed promotes the seasonal prediction capability of the WNP TCF. Conference Object Arctic Chukchi Greenland okhotsk sea Sea ice GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Previous studies proved that the East Asia summer monsoon circulation, such as monsoon trough (MT) and western Pacific subtropical high (WPSH) are closely correlated with tropical cyclone (TC) activity. Here, we emphasized that the excessive Chukchi-Beaufort (C-B) and Greenland (GL) sea ice sustains from August to the following early autumn and triggers the southeastward propagation of the Rossby wave trains originating from the Arctic across Western Eurasia (Okhotsk Sea) to the western North Pacific (WNP). The resultant abnormal low pressure over WNP, implying a decreased WPSH, provides suitable environmental conditions for TC formation—the enhancement of the lower-level relative vorticity and water moisture, and the decrease of vertical wind shear. For the reduced sea ice, an opposite situation tends to emerge. The persistent combined sea ice signal makes it a physically meaningful precursor for TCF prediction. The cross-validated hindcast and independent forecast based on both the tropical SST and the Arctic sea ice precursors present that the TCF index is predicted with much higher correlation coefficients than the empirical models with only the tropical SST predictors. The results demonstrate that the Arctic sea ice indeed promotes the seasonal prediction capability of the WNP TCF. |
format |
Conference Object |
author |
Zhang, P. |
spellingShingle |
Zhang, P. Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific |
author_facet |
Zhang, P. |
author_sort |
Zhang, P. |
title |
Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific |
title_short |
Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific |
title_full |
Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific |
title_fullStr |
Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific |
title_full_unstemmed |
Arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western North Pacific |
title_sort |
arctic sea ice promoting seasonal prediction capability of the early autumn tropical cyclone formation frequency over the western north pacific |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017707 |
genre |
Arctic Chukchi Greenland okhotsk sea Sea ice |
genre_facet |
Arctic Chukchi Greenland okhotsk sea Sea ice |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1880 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017707 |
op_doi |
https://doi.org/10.57757/IUGG23-1880 |
_version_ |
1781055961050382336 |