Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico)
This work provides an assessment of the two most intense seasonal droughts that occurred over the Balsas River Basin (BRB) in the period 1980–2017. The detection of the drought events was performed using the 6 month scale standardized precipitation–evapotranspiration index (SPEI-6) and the 6 month s...
Published in: | Atmosphere |
---|---|
Main Authors: | , , , , , |
Format: | Text |
Language: | English |
Published: |
Multidisciplinary Digital Publishing Institute
2021
|
Subjects: | |
Online Access: | https://doi.org/10.3390/atmos12030368 |
id |
ftmdpi:oai:mdpi.com:/2073-4433/12/3/368/ |
---|---|
record_format |
openpolar |
spelling |
ftmdpi:oai:mdpi.com:/2073-4433/12/3/368/ 2023-08-20T04:08:31+02:00 Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) Ana E. Melgarejo Paulina Ordoñez Raquel Nieto Cristina Peña-Ortiz Ricardo García-Herrera Luis Gimeno agris 2021-03-11 application/pdf https://doi.org/10.3390/atmos12030368 EN eng Multidisciplinary Digital Publishing Institute Biosphere/Hydrosphere/Land–Atmosphere Interactions https://dx.doi.org/10.3390/atmos12030368 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 12; Issue 3; Pages: 368 drought SPEI SPI moisture transport FLEXPART trade wind inversion Text 2021 ftmdpi https://doi.org/10.3390/atmos12030368 2023-08-01T01:15:45Z This work provides an assessment of the two most intense seasonal droughts that occurred over the Balsas River Basin (BRB) in the period 1980–2017. The detection of the drought events was performed using the 6 month scale standardized precipitation–evapotranspiration index (SPEI-6) and the 6 month standardized precipitation index (SPI-6) in October. Both indices were quite similar during the studied period, highlighting the larger contribution of precipitation deficits vs. temperature excess to the drought occurrence in the basin. The origin of the atmospheric water arriving to the BRB (1 May 1980–31 October 2017) was investigated by using a Lagrangian diagnosis method. The BRB receives moisture from the Caribbean Sea and the rest of the tropical Atlantic, the Gulf of Mexico, the eastern north Pacific and from three terrestrial evaporative sources: the region north of BRB, the south of BRB and the BRB itself. The terrestrial evaporative source of the BRB itself is by far the main moisture source. The two most intense drought events that occurred in the studied period were selected for further analysis. During the severe drought of 2005, the summertime sea surface temperature (SST) soared over the Caribbean Sea, extending eastward into a large swathe of tropical North Atlantic, which was accompanied by the record to date of hurricane activity. This heating generated a Rossby wave response with westward propagating anticyclonic/cyclonic gyres in the upper/lower troposphere. A cyclonic low-level circulation developed over the Gulf of Mexico and prevented the moisture from arriving to the BRB, with a consequent deficit in precipitation. Additionally, subsidence also prevented convection in most of the months of this drought period. During the extreme drought event of 1982, the Inter Tropical Convergence Zone (ITCZ) remained southern and stronger than the climatological mean over the eastern tropical Pacific, producing an intense regional Hadley circulation. The descent branch of this cell inhibited the development ... Text North Atlantic MDPI Open Access Publishing Pacific Atmosphere 12 3 368 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
drought SPEI SPI moisture transport FLEXPART trade wind inversion |
spellingShingle |
drought SPEI SPI moisture transport FLEXPART trade wind inversion Ana E. Melgarejo Paulina Ordoñez Raquel Nieto Cristina Peña-Ortiz Ricardo García-Herrera Luis Gimeno Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) |
topic_facet |
drought SPEI SPI moisture transport FLEXPART trade wind inversion |
description |
This work provides an assessment of the two most intense seasonal droughts that occurred over the Balsas River Basin (BRB) in the period 1980–2017. The detection of the drought events was performed using the 6 month scale standardized precipitation–evapotranspiration index (SPEI-6) and the 6 month standardized precipitation index (SPI-6) in October. Both indices were quite similar during the studied period, highlighting the larger contribution of precipitation deficits vs. temperature excess to the drought occurrence in the basin. The origin of the atmospheric water arriving to the BRB (1 May 1980–31 October 2017) was investigated by using a Lagrangian diagnosis method. The BRB receives moisture from the Caribbean Sea and the rest of the tropical Atlantic, the Gulf of Mexico, the eastern north Pacific and from three terrestrial evaporative sources: the region north of BRB, the south of BRB and the BRB itself. The terrestrial evaporative source of the BRB itself is by far the main moisture source. The two most intense drought events that occurred in the studied period were selected for further analysis. During the severe drought of 2005, the summertime sea surface temperature (SST) soared over the Caribbean Sea, extending eastward into a large swathe of tropical North Atlantic, which was accompanied by the record to date of hurricane activity. This heating generated a Rossby wave response with westward propagating anticyclonic/cyclonic gyres in the upper/lower troposphere. A cyclonic low-level circulation developed over the Gulf of Mexico and prevented the moisture from arriving to the BRB, with a consequent deficit in precipitation. Additionally, subsidence also prevented convection in most of the months of this drought period. During the extreme drought event of 1982, the Inter Tropical Convergence Zone (ITCZ) remained southern and stronger than the climatological mean over the eastern tropical Pacific, producing an intense regional Hadley circulation. The descent branch of this cell inhibited the development ... |
format |
Text |
author |
Ana E. Melgarejo Paulina Ordoñez Raquel Nieto Cristina Peña-Ortiz Ricardo García-Herrera Luis Gimeno |
author_facet |
Ana E. Melgarejo Paulina Ordoñez Raquel Nieto Cristina Peña-Ortiz Ricardo García-Herrera Luis Gimeno |
author_sort |
Ana E. Melgarejo |
title |
Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) |
title_short |
Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) |
title_full |
Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) |
title_fullStr |
Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) |
title_full_unstemmed |
Mechanisms for Severe Drought Occurrence in the Balsas River Basin (Mexico) |
title_sort |
mechanisms for severe drought occurrence in the balsas river basin (mexico) |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/atmos12030368 |
op_coverage |
agris |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmosphere; Volume 12; Issue 3; Pages: 368 |
op_relation |
Biosphere/Hydrosphere/Land–Atmosphere Interactions https://dx.doi.org/10.3390/atmos12030368 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos12030368 |
container_title |
Atmosphere |
container_volume |
12 |
container_issue |
3 |
container_start_page |
368 |
_version_ |
1774720819741589504 |