An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes
In this study, the causes of the increase in global mean tropical cyclone translation speed (TCTS) in the post-satellite era were investigated. Analysis reveals that the global-mean TCTS increased by 0.31 km h ^−1 per decade over the last 36 years, but the steering flow controlling the local TCTS de...
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ftdoajarticles:oai:doaj.org/article:0a1b504720ec4312833001aea481ff9a 2023-09-05T13:21:29+02:00 An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes Sung-Hun Kim Il-Ju Moon Pao-Shin Chu 2020-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/ab9e1f https://doaj.org/article/0a1b504720ec4312833001aea481ff9a EN eng IOP Publishing https://doi.org/10.1088/1748-9326/ab9e1f https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ab9e1f 1748-9326 https://doaj.org/article/0a1b504720ec4312833001aea481ff9a Environmental Research Letters, Vol 15, Iss 9, p 094084 (2020) tropical cyclone translation speed global warming natural variability Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2020 ftdoajarticles https://doi.org/10.1088/1748-9326/ab9e1f 2023-08-13T00:37:20Z In this study, the causes of the increase in global mean tropical cyclone translation speed (TCTS) in the post-satellite era were investigated. Analysis reveals that the global-mean TCTS increased by 0.31 km h ^−1 per decade over the last 36 years, but the steering flow controlling the local TCTS decreased by −0.24 km h ^−1 per decade in the major tropical cyclone (TC) passage regions. These values correspond to a change of 5.9% and −5.6% during the analysis period for the mean TCTS and steering flow, respectively. The inconsistency between these two related variables (TCTS and steering flows) is caused by relative TC frequency changes according to basin and latitude. The TCTS is closely related to the latitude of the TC position, which shows a significant difference in mean TCTS between basins. That is, the increased global-mean TCTS is mainly attributed to the following: (1) an increase (4.5% per decade) in the relative proportion of the North Atlantic TCs in terms of global TC’s position points (this region has the fastest mean TCTS among all basins); and (2) the poleward shift of TC activities. These two effects account for 76.8% and 25.8% of the observed global-mean TCTS trend, respectively, and thus overwhelm those of the slowing steering flow related to the weakening of large-scale tropical circulation, which leads to a global mean increase in TCTS. Given that TC activity in the North Atlantic is closely related to the Atlantic Multi-decadal Oscillation and a poleward shift of TC exposure is likely induced by global warming, the recent increase in the global-mean TCTS is a joint outcome of both natural variations and anthrophonic effects. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Environmental Research Letters 15 9 094084 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
tropical cyclone translation speed global warming natural variability Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
tropical cyclone translation speed global warming natural variability Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Sung-Hun Kim Il-Ju Moon Pao-Shin Chu An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
topic_facet |
tropical cyclone translation speed global warming natural variability Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
In this study, the causes of the increase in global mean tropical cyclone translation speed (TCTS) in the post-satellite era were investigated. Analysis reveals that the global-mean TCTS increased by 0.31 km h ^−1 per decade over the last 36 years, but the steering flow controlling the local TCTS decreased by −0.24 km h ^−1 per decade in the major tropical cyclone (TC) passage regions. These values correspond to a change of 5.9% and −5.6% during the analysis period for the mean TCTS and steering flow, respectively. The inconsistency between these two related variables (TCTS and steering flows) is caused by relative TC frequency changes according to basin and latitude. The TCTS is closely related to the latitude of the TC position, which shows a significant difference in mean TCTS between basins. That is, the increased global-mean TCTS is mainly attributed to the following: (1) an increase (4.5% per decade) in the relative proportion of the North Atlantic TCs in terms of global TC’s position points (this region has the fastest mean TCTS among all basins); and (2) the poleward shift of TC activities. These two effects account for 76.8% and 25.8% of the observed global-mean TCTS trend, respectively, and thus overwhelm those of the slowing steering flow related to the weakening of large-scale tropical circulation, which leads to a global mean increase in TCTS. Given that TC activity in the North Atlantic is closely related to the Atlantic Multi-decadal Oscillation and a poleward shift of TC exposure is likely induced by global warming, the recent increase in the global-mean TCTS is a joint outcome of both natural variations and anthrophonic effects. |
format |
Article in Journal/Newspaper |
author |
Sung-Hun Kim Il-Ju Moon Pao-Shin Chu |
author_facet |
Sung-Hun Kim Il-Ju Moon Pao-Shin Chu |
author_sort |
Sung-Hun Kim |
title |
An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
title_short |
An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
title_full |
An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
title_fullStr |
An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
title_full_unstemmed |
An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
title_sort |
increase in global trends of tropical cyclone translation speed since 1982 and its physical causes |
publisher |
IOP Publishing |
publishDate |
2020 |
url |
https://doi.org/10.1088/1748-9326/ab9e1f https://doaj.org/article/0a1b504720ec4312833001aea481ff9a |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Environmental Research Letters, Vol 15, Iss 9, p 094084 (2020) |
op_relation |
https://doi.org/10.1088/1748-9326/ab9e1f https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ab9e1f 1748-9326 https://doaj.org/article/0a1b504720ec4312833001aea481ff9a |
op_doi |
https://doi.org/10.1088/1748-9326/ab9e1f |
container_title |
Environmental Research Letters |
container_volume |
15 |
container_issue |
9 |
container_start_page |
094084 |
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1776202093266206720 |