Strong interannual variation of the Indian summer monsoon in the Late Miocene

Hui Tang, Jussi Tuomas Eronen, Arne Micheels, Bodo Arhens

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

The modern Asian monsoon system exhibits strong interannual variation, which has profound environmental and economical impacts. It has been well-documented that the mean Asian monsoon state underwent significant changes in the Late Miocene (11–5 Ma ago). But how the interannual variability of the monsoon climate evolved during this period is still largely unknown. In this study, a long-term simulation of the Late Miocene with a fully coupled atmosphere–ocean general circulation model (ECHAM5/MPI-OM) at T31L19 resolution is used to explore the interannual variation of the Indian summer monsoon (ISM) in the Late Miocene. The regional climate model COSMO–CLM with a higher spatial resolution (~1° × 1°) is further employed to better characterize the spatial patterns of these variations. Our results show that although the mean ISM circulation is weaker in the Late Miocene runs, its interannual variation is as strong as or even stronger than at present and the dominant periods (~2.6–2.7 years) are shorter than at present (~3.4–8.4 years). It is noticed that while the extratropical influence on the ISM variability is weaker-than-present, a persistent El Niño-Southern Oscillation with stronger-than-present interannual variability is observed in our Late Miocene run. This may have maintained a strong interannual variation of the ISM with a shorter period in the Late Miocene. Our findings do not only improve our understanding of the Asian monsoon evolution in the Late Miocene, but also shed light on the future changes in the interannual variability of the ISM.
Originalspråkengelska
TidskriftClimate dynamics : observational, theoretical and computational research on the climate system
Volym41
Utgåva1
Sidor (från-till)135-153
Antal sidor19
ISSN0930-7575
DOI
StatusPublicerad - jul 2013
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 1171 Geovetenskaper

Citera det här

@article{5f668cba3f9541fa9cf22588a9c7b238,
title = "Strong interannual variation of the Indian summer monsoon in the Late Miocene",
abstract = "The modern Asian monsoon system exhibits strong interannual variation, which has profound environmental and economical impacts. It has been well-documented that the mean Asian monsoon state underwent significant changes in the Late Miocene (11–5 Ma ago). But how the interannual variability of the monsoon climate evolved during this period is still largely unknown. In this study, a long-term simulation of the Late Miocene with a fully coupled atmosphere–ocean general circulation model (ECHAM5/MPI-OM) at T31L19 resolution is used to explore the interannual variation of the Indian summer monsoon (ISM) in the Late Miocene. The regional climate model COSMO–CLM with a higher spatial resolution (~1° × 1°) is further employed to better characterize the spatial patterns of these variations. Our results show that although the mean ISM circulation is weaker in the Late Miocene runs, its interannual variation is as strong as or even stronger than at present and the dominant periods (~2.6–2.7 years) are shorter than at present (~3.4–8.4 years). It is noticed that while the extratropical influence on the ISM variability is weaker-than-present, a persistent El Ni{\~n}o-Southern Oscillation with stronger-than-present interannual variability is observed in our Late Miocene run. This may have maintained a strong interannual variation of the ISM with a shorter period in the Late Miocene. Our findings do not only improve our understanding of the Asian monsoon evolution in the Late Miocene, but also shed light on the future changes in the interannual variability of the ISM.",
keywords = "1171 Geosciences",
author = "Hui Tang and Eronen, {Jussi Tuomas} and Arne Micheels and Bodo Arhens",
year = "2013",
month = "7",
doi = "10.1007/s00382-012-1655-y",
language = "English",
volume = "41",
pages = "135--153",
journal = "Climate dynamics : observational, theoretical and computational research on the climate system",
issn = "0930-7575",
publisher = "Springer",
number = "1",

}

Strong interannual variation of the Indian summer monsoon in the Late Miocene. / Tang, Hui; Eronen, Jussi Tuomas; Micheels, Arne; Arhens, Bodo.

I: Climate dynamics : observational, theoretical and computational research on the climate system, Vol. 41, Nr. 1, 07.2013, s. 135-153.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Strong interannual variation of the Indian summer monsoon in the Late Miocene

AU - Tang, Hui

AU - Eronen, Jussi Tuomas

AU - Micheels, Arne

AU - Arhens, Bodo

PY - 2013/7

Y1 - 2013/7

N2 - The modern Asian monsoon system exhibits strong interannual variation, which has profound environmental and economical impacts. It has been well-documented that the mean Asian monsoon state underwent significant changes in the Late Miocene (11–5 Ma ago). But how the interannual variability of the monsoon climate evolved during this period is still largely unknown. In this study, a long-term simulation of the Late Miocene with a fully coupled atmosphere–ocean general circulation model (ECHAM5/MPI-OM) at T31L19 resolution is used to explore the interannual variation of the Indian summer monsoon (ISM) in the Late Miocene. The regional climate model COSMO–CLM with a higher spatial resolution (~1° × 1°) is further employed to better characterize the spatial patterns of these variations. Our results show that although the mean ISM circulation is weaker in the Late Miocene runs, its interannual variation is as strong as or even stronger than at present and the dominant periods (~2.6–2.7 years) are shorter than at present (~3.4–8.4 years). It is noticed that while the extratropical influence on the ISM variability is weaker-than-present, a persistent El Niño-Southern Oscillation with stronger-than-present interannual variability is observed in our Late Miocene run. This may have maintained a strong interannual variation of the ISM with a shorter period in the Late Miocene. Our findings do not only improve our understanding of the Asian monsoon evolution in the Late Miocene, but also shed light on the future changes in the interannual variability of the ISM.

AB - The modern Asian monsoon system exhibits strong interannual variation, which has profound environmental and economical impacts. It has been well-documented that the mean Asian monsoon state underwent significant changes in the Late Miocene (11–5 Ma ago). But how the interannual variability of the monsoon climate evolved during this period is still largely unknown. In this study, a long-term simulation of the Late Miocene with a fully coupled atmosphere–ocean general circulation model (ECHAM5/MPI-OM) at T31L19 resolution is used to explore the interannual variation of the Indian summer monsoon (ISM) in the Late Miocene. The regional climate model COSMO–CLM with a higher spatial resolution (~1° × 1°) is further employed to better characterize the spatial patterns of these variations. Our results show that although the mean ISM circulation is weaker in the Late Miocene runs, its interannual variation is as strong as or even stronger than at present and the dominant periods (~2.6–2.7 years) are shorter than at present (~3.4–8.4 years). It is noticed that while the extratropical influence on the ISM variability is weaker-than-present, a persistent El Niño-Southern Oscillation with stronger-than-present interannual variability is observed in our Late Miocene run. This may have maintained a strong interannual variation of the ISM with a shorter period in the Late Miocene. Our findings do not only improve our understanding of the Asian monsoon evolution in the Late Miocene, but also shed light on the future changes in the interannual variability of the ISM.

KW - 1171 Geosciences

U2 - 10.1007/s00382-012-1655-y

DO - 10.1007/s00382-012-1655-y

M3 - Article

VL - 41

SP - 135

EP - 153

JO - Climate dynamics : observational, theoretical and computational research on the climate system

JF - Climate dynamics : observational, theoretical and computational research on the climate system

SN - 0930-7575

IS - 1

ER -