Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas
In this chapter, indexes of the Intra-Americas or Caribbean Low-Level Jet (IALLJ or CLLJ, respectively), Niño 3, Tropical North Atlantic (NATL), Atlantic Multidecadal Oscillation (AMO), and Outgoing Long Wave Radiation (OLR) are quantified for the period 1950–2007, to study their relationship with t...
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ftunivcostarica:oai:https://www.kerwa.ucr.ac.cr:10669/76698 2023-05-15T17:32:37+02:00 Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas Amador Astúa, Jorge Alberto Alfaro Martínez, Eric J. Rivera Fernández, Erick Calderón Solera, Blanca 2010-08-04 application/pdf https://hdl.handle.net/10669/76698 https://link.springer.com/chapter/10.1007/978-90-481-9510-7_9 https://doi.org/10.1007/978-90-481-9510-7_9 en_US eng https://link.springer.com/chapter/10.1007/978-90-481-9510-7_9 978-90-481-9510-7 https://hdl.handle.net/10669/76698 doi:10.1007/978-90-481-9510-7_9 805-A7-002 805-A7-755 805-A8-401 805-A8-606 805-A9-532 808-A9-070 808-A9-180 In: Hurricanes and Climate Change. Elsner J., Hodges R., Malmstadt J., Scheitlin K. (eds.). Dordrecht: Springer. pp 149-173 Intra Americas (Caribbean) Low Level Jet Mid-Summer Drought Tropical cyclone frequency El Niño Southern Oscillation (ENSO) Tropical North Atlantic (NATL) 551.6 Climatología y estado atmosférico capítulo de libro 2010 ftunivcostarica https://doi.org/10.1007/978-90-481-9510-7_9 2022-10-30T05:52:15Z In this chapter, indexes of the Intra-Americas or Caribbean Low-Level Jet (IALLJ or CLLJ, respectively), Niño 3, Tropical North Atlantic (NATL), Atlantic Multidecadal Oscillation (AMO), and Outgoing Long Wave Radiation (OLR) are quantified for the period 1950–2007, to study their relationship with tropical cyclone (TC) frequency for summer–autumn of the Northern Hemisphere. A remarkable inverse relationship is found between both, the strength of the wind speed at 925 hPa and the vertical wind shear at low levels, and the monthly relative frequency of TCs for two selected areas in the Caribbean. The July peak in wind speed and low-level vertical wind shear are associated with a minimum in the monthly relative frequency of TCs. On the contrary, a decrease in the wind speed and vertical shears are associated with a maximum value of the relative frequency of TCs. Stronger (weaker) than normal IALLJ summer winds (July–August) during warm (cold) ENSO events imply a stronger (weaker) than normal vertical wind shear at low-levels in the Caribbean. This condition may inhibit (allow) deep convection, disfavoring (favoring) TC development during these months. Correlation values of the monthly mean CLLJ core winds and the monthly normalized values of NATL – Niño 3 index for 1950–2007 showed statistical significance greater than 99% during July–August. During El Niño years, low-level wind increases at the jet core strengthening the low level convergence near Central America at the jet exit and the low-level divergence in the central Caribbean at the jet entrance. The descending motion associated with the latter acts as an inhibiting factor for convection and TC development. TC activity in the Caribbean is not only sensitive to ENSO influences, but to the strength of the CLLJ vertical wind shear, to barotropic energy conversions induced by the lateral wind shear, to the intensity of the regional scale descending motion associated with the jet entrance, and to the SST cooling generated by the CLLJ at the sea surface. ... Book Part North Atlantic Universidad de Costa Rica: Repositorio Kérwá 149 173 Dordrecht |
institution |
Open Polar |
collection |
Universidad de Costa Rica: Repositorio Kérwá |
op_collection_id |
ftunivcostarica |
language |
English |
topic |
Intra Americas (Caribbean) Low Level Jet Mid-Summer Drought Tropical cyclone frequency El Niño Southern Oscillation (ENSO) Tropical North Atlantic (NATL) 551.6 Climatología y estado atmosférico |
spellingShingle |
Intra Americas (Caribbean) Low Level Jet Mid-Summer Drought Tropical cyclone frequency El Niño Southern Oscillation (ENSO) Tropical North Atlantic (NATL) 551.6 Climatología y estado atmosférico Amador Astúa, Jorge Alberto Alfaro Martínez, Eric J. Rivera Fernández, Erick Calderón Solera, Blanca Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas |
topic_facet |
Intra Americas (Caribbean) Low Level Jet Mid-Summer Drought Tropical cyclone frequency El Niño Southern Oscillation (ENSO) Tropical North Atlantic (NATL) 551.6 Climatología y estado atmosférico |
description |
In this chapter, indexes of the Intra-Americas or Caribbean Low-Level Jet (IALLJ or CLLJ, respectively), Niño 3, Tropical North Atlantic (NATL), Atlantic Multidecadal Oscillation (AMO), and Outgoing Long Wave Radiation (OLR) are quantified for the period 1950–2007, to study their relationship with tropical cyclone (TC) frequency for summer–autumn of the Northern Hemisphere. A remarkable inverse relationship is found between both, the strength of the wind speed at 925 hPa and the vertical wind shear at low levels, and the monthly relative frequency of TCs for two selected areas in the Caribbean. The July peak in wind speed and low-level vertical wind shear are associated with a minimum in the monthly relative frequency of TCs. On the contrary, a decrease in the wind speed and vertical shears are associated with a maximum value of the relative frequency of TCs. Stronger (weaker) than normal IALLJ summer winds (July–August) during warm (cold) ENSO events imply a stronger (weaker) than normal vertical wind shear at low-levels in the Caribbean. This condition may inhibit (allow) deep convection, disfavoring (favoring) TC development during these months. Correlation values of the monthly mean CLLJ core winds and the monthly normalized values of NATL – Niño 3 index for 1950–2007 showed statistical significance greater than 99% during July–August. During El Niño years, low-level wind increases at the jet core strengthening the low level convergence near Central America at the jet exit and the low-level divergence in the central Caribbean at the jet entrance. The descending motion associated with the latter acts as an inhibiting factor for convection and TC development. TC activity in the Caribbean is not only sensitive to ENSO influences, but to the strength of the CLLJ vertical wind shear, to barotropic energy conversions induced by the lateral wind shear, to the intensity of the regional scale descending motion associated with the jet entrance, and to the SST cooling generated by the CLLJ at the sea surface. ... |
format |
Book Part |
author |
Amador Astúa, Jorge Alberto Alfaro Martínez, Eric J. Rivera Fernández, Erick Calderón Solera, Blanca |
author_facet |
Amador Astúa, Jorge Alberto Alfaro Martínez, Eric J. Rivera Fernández, Erick Calderón Solera, Blanca |
author_sort |
Amador Astúa, Jorge Alberto |
title |
Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas |
title_short |
Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas |
title_full |
Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas |
title_fullStr |
Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas |
title_full_unstemmed |
Climatic Features and Their Relationship with Tropical Cyclones Over the Intra-Americas Seas |
title_sort |
climatic features and their relationship with tropical cyclones over the intra-americas seas |
publishDate |
2010 |
url |
https://hdl.handle.net/10669/76698 https://link.springer.com/chapter/10.1007/978-90-481-9510-7_9 https://doi.org/10.1007/978-90-481-9510-7_9 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
In: Hurricanes and Climate Change. Elsner J., Hodges R., Malmstadt J., Scheitlin K. (eds.). Dordrecht: Springer. pp 149-173 |
op_relation |
https://link.springer.com/chapter/10.1007/978-90-481-9510-7_9 978-90-481-9510-7 https://hdl.handle.net/10669/76698 doi:10.1007/978-90-481-9510-7_9 805-A7-002 805-A7-755 805-A8-401 805-A8-606 805-A9-532 808-A9-070 808-A9-180 |
op_doi |
https://doi.org/10.1007/978-90-481-9510-7_9 |
container_start_page |
149 |
op_container_end_page |
173 |
op_publisher_place |
Dordrecht |
_version_ |
1766130822213009408 |