A Later Onset of the Rainy Season in California
Californian hydroclimate is strongly seasonal and prone to severe water shortages. Recent changes in climate trends have induced shifts in seasonality, thus exacerbating droughts, wildfires, and adverse water shortage effects on the environment and economy. Previous studies have examined the timing...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Amer Geophysical Union, Washington
2021
|
Subjects: | |
Online Access: | https://gery.gef.bg.ac.rs/handle/123456789/1088 https://doi.org/10.1029/2020GL090350 https://hdl.handle.net/21.15107/rcub_gery_1088 |
id |
ftunivbelgradfg:oai:gery.gef.bg.ac.rs:123456789/1088 |
---|---|
record_format |
openpolar |
spelling |
ftunivbelgradfg:oai:gery.gef.bg.ac.rs:123456789/1088 2024-01-14T09:58:57+01:00 A Later Onset of the Rainy Season in California Luković, Jelena Chiang, John C. H. Blagojević, Dragan Sekulić, Aleksandar 2021 https://gery.gef.bg.ac.rs/handle/123456789/1088 https://doi.org/10.1029/2020GL090350 https://hdl.handle.net/21.15107/rcub_gery_1088 unknown Amer Geophysical Union, Washington Fulbright Visiting Scholar Grant info:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/43007/RS// info:eu-repo/grantAgreement/MESTD/Technological Development (TD or TR)/36020/RS// 0094-8276 https://gery.gef.bg.ac.rs/handle/123456789/1088 000623802900037 doi:10.1029/2020GL090350 2-s2.0-85101499632 https://hdl.handle.net/21.15107/rcub_gery_1088 restrictedAccess ARR Geophysical Research Letters article publishedVersion 2021 ftunivbelgradfg https://doi.org/10.1029/2020GL090350 2023-12-19T17:18:47Z Californian hydroclimate is strongly seasonal and prone to severe water shortages. Recent changes in climate trends have induced shifts in seasonality, thus exacerbating droughts, wildfires, and adverse water shortage effects on the environment and economy. Previous studies have examined the timing of the seasonal cycle shifts mainly as temperature driven earlier onset of the spring season. In this paper, we address quantitative changes in the onset, amounts, and termination of the precipitation season over the past 6 decades, as well as the large-scale atmospheric circulation underpinning the seasonal cycle changes. We discover that the onset of the rainy season has been progressively delayed since the 1960s, and as a result the precipitation season has become shorter and sharper in California. The progressively later onset of the rainy season is shown to be related to the summer circulation pattern extending into autumn across the North Pacific, in particular, a delay in the strengthening of the Aleutian Low and later southward displacement of the North Pacific westerlies. Plain Language Summary The rainy season over California is projected to show a distinct sharpening of the mean seasonal cycle, with winter precipitation increasing, and both autumn and spring precipitation decreasing. Our analysis of the past 6 decades of data for California suggests autumn decrease is already underway. A delayed start of the rainy season of 27 days since 1960s can exacerbate seasonal droughts and prolong the wildfire season. This delay occurs due to a number of conditions that controls precipitation: the summer circulation pattern has been extending throughout November across the North Pacific, and the wintertime strengthening of the Aleutian Low is delayed. Accordingly, the southward migration of the North Pacific jet stream as well as extratropical storm tracks, which marks the start of the California rainy season, are delayed. More work, using climate models, will be needed to provide a better understanding of ... Article in Journal/Newspaper aleutian low GERY - Faculty of Geography Repository University of Belgrade Pacific Geophysical Research Letters 48 4 |
institution |
Open Polar |
collection |
GERY - Faculty of Geography Repository University of Belgrade |
op_collection_id |
ftunivbelgradfg |
language |
unknown |
description |
Californian hydroclimate is strongly seasonal and prone to severe water shortages. Recent changes in climate trends have induced shifts in seasonality, thus exacerbating droughts, wildfires, and adverse water shortage effects on the environment and economy. Previous studies have examined the timing of the seasonal cycle shifts mainly as temperature driven earlier onset of the spring season. In this paper, we address quantitative changes in the onset, amounts, and termination of the precipitation season over the past 6 decades, as well as the large-scale atmospheric circulation underpinning the seasonal cycle changes. We discover that the onset of the rainy season has been progressively delayed since the 1960s, and as a result the precipitation season has become shorter and sharper in California. The progressively later onset of the rainy season is shown to be related to the summer circulation pattern extending into autumn across the North Pacific, in particular, a delay in the strengthening of the Aleutian Low and later southward displacement of the North Pacific westerlies. Plain Language Summary The rainy season over California is projected to show a distinct sharpening of the mean seasonal cycle, with winter precipitation increasing, and both autumn and spring precipitation decreasing. Our analysis of the past 6 decades of data for California suggests autumn decrease is already underway. A delayed start of the rainy season of 27 days since 1960s can exacerbate seasonal droughts and prolong the wildfire season. This delay occurs due to a number of conditions that controls precipitation: the summer circulation pattern has been extending throughout November across the North Pacific, and the wintertime strengthening of the Aleutian Low is delayed. Accordingly, the southward migration of the North Pacific jet stream as well as extratropical storm tracks, which marks the start of the California rainy season, are delayed. More work, using climate models, will be needed to provide a better understanding of ... |
format |
Article in Journal/Newspaper |
author |
Luković, Jelena Chiang, John C. H. Blagojević, Dragan Sekulić, Aleksandar |
spellingShingle |
Luković, Jelena Chiang, John C. H. Blagojević, Dragan Sekulić, Aleksandar A Later Onset of the Rainy Season in California |
author_facet |
Luković, Jelena Chiang, John C. H. Blagojević, Dragan Sekulić, Aleksandar |
author_sort |
Luković, Jelena |
title |
A Later Onset of the Rainy Season in California |
title_short |
A Later Onset of the Rainy Season in California |
title_full |
A Later Onset of the Rainy Season in California |
title_fullStr |
A Later Onset of the Rainy Season in California |
title_full_unstemmed |
A Later Onset of the Rainy Season in California |
title_sort |
later onset of the rainy season in california |
publisher |
Amer Geophysical Union, Washington |
publishDate |
2021 |
url |
https://gery.gef.bg.ac.rs/handle/123456789/1088 https://doi.org/10.1029/2020GL090350 https://hdl.handle.net/21.15107/rcub_gery_1088 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_source |
Geophysical Research Letters |
op_relation |
Fulbright Visiting Scholar Grant info:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/43007/RS// info:eu-repo/grantAgreement/MESTD/Technological Development (TD or TR)/36020/RS// 0094-8276 https://gery.gef.bg.ac.rs/handle/123456789/1088 000623802900037 doi:10.1029/2020GL090350 2-s2.0-85101499632 https://hdl.handle.net/21.15107/rcub_gery_1088 |
op_rights |
restrictedAccess ARR |
op_doi |
https://doi.org/10.1029/2020GL090350 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
4 |
_version_ |
1788067050221993984 |