The portrayal of the Australian monsoon equatorial monsoon shear line by GCMs: enhanced greenhouse scenario implications

1992 ◽  
Vol 7 (4) ◽  
pp. 173-180 ◽  
Author(s):  
BF Ryan ◽  
DA Jones ◽  
HB Gordon
Keyword(s):  
Australian Monsoon ◽  
Shear Line

Uncertainty in CMIP6 climate change projections for the Australian monsoon is tied to hemispheric-scale changes

2020 ◽  
Author(s):  
Sugata Narsey ◽  
Josephine R. Brown ◽  
Robert A. Colman ◽  
Francois Delage ◽  
Scott Brendan Power ◽  
...  
Keyword(s):  
Climate Change ◽  
Climate Change Projections ◽  
Australian Monsoon

scholarly journals Monitoring Australian Monsoon variability over the past four glacial cycles

2021 ◽  
Vol 568 ◽  
pp. 110280
Author(s):  
Renjie Pei ◽  
Wolfgang Kuhnt ◽  
Ann Holbourn ◽  
Johanna Hingst ◽  
Matthias Koppe ◽  
...  
Keyword(s):  
Glacial Cycles ◽  
Australian Monsoon ◽  
The Past ◽  
Monsoon Variability

Seasonal transition features of large-scale moisture transport in the Asian-Australian monsoon region

2007 ◽  
Vol 24 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Jinhai He ◽  
Chenghu Sun ◽  
Yunyun Liu ◽  
Jun Matsumoto ◽  
Weijing Li
Keyword(s):  
Moisture Transport ◽  
Large Scale ◽  
Monsoon Region ◽  
Seasonal Transition ◽  
Australian Monsoon

The relationship between the El Niño Southern Oscillation and Australian monsoon rainfall on decadal time-scales

2021 ◽  
Author(s):  
Hanna Heidemann ◽  
Joachim Ribbe ◽  
Benjamin J. Henley ◽  
Tim Cowan ◽  
Christa Pudmenzky ◽  
...  
Keyword(s):  
Monsoon Rainfall ◽  
Decadal Variability ◽  
Southern Oscillation ◽  
Eastern Pacific ◽  
Central Pacific ◽  
Australian Monsoon ◽  
Enso Events ◽  
Pacific Decadal Variability ◽  
Prediction Systems ◽  
Different Response

<p>This research analyses the observed relationship between eastern and central Pacific El Niño Southern Oscillation (ENSO) events and Australian monsoon rainfall (AUMR) on a decadal timescale during the December to March monsoon months. To assess the decadal influence of the different flavours of ENSO on the AUMR, we focus on the phases of the Interdecadal Pacific Oscillation (IPO) over the period 1920 to 2020.  The AUMR is characterized by substantial decadal variability, which appears to be linked to the positive and negative phases of the IPO. During the past two historical negative IPO phases, significant correlations have been observed between central Pacific sea surface temperature (SST) anomalies and AUMR over both the northeast and northwest of Australia. This central Pacific SST-AUMR relationship has strengthened from the first negative IPO phase (mid-1940s to the mid-1970s) to the second (late 1990s to mid-2010s), while the eastern Pacific SST-AUMR influence has weakened. Composite rainfall anomalies over Australia reveal a different response of AUMR to central Pacific El Niño/La Niña and eastern Pacific La Niña events during positive IPO and negative IPO phases. This research clearly shows that ENSO's influence on AUMR is modulated by Pacific decadal variability, however this teleconnection, in itself, can change between similar decadal Pacific states.  Going forward, as decadal prediction systems improve and become more mainstream, the IPO phase could be used as a potential source for decadal predictability of the tendency of AUMR.  </p>

scholarly journals Indo-Pacific Variability on Seasonal to Multidecadal Time Scales. Part II: Multiscale Atmosphere–Ocean Linkages

2018 ◽  
Vol 31 (2) ◽  
pp. 693-725 ◽  
Author(s):  
Dimitrios Giannakis ◽  
Joanna Slawinska
Keyword(s):  
Time Scales ◽  
El Niño ◽  
El Nino ◽  
Walker Circulation ◽  
La Niña ◽  
Central Pacific ◽  
Australian Monsoon ◽  
La Nina ◽  
Combination Modes ◽  
Sst Anomalies

The coupled atmosphere–ocean variability of the Indo-Pacific domain on seasonal to multidecadal time scales is investigated in CCSM4 and in observations through nonlinear Laplacian spectral analysis (NLSA). It is found that ENSO modes and combination modes of ENSO with the annual cycle exhibit a seasonally synchronized southward shift of equatorial surface zonal winds and thermocline adjustment consistent with terminating El Niño and La Niña events. The surface winds associated with these modes also generate teleconnections between the Pacific and Indian Oceans, leading to SST anomalies characteristic of the Indian Ocean dipole. The family of NLSA ENSO modes is used to study El Niño–La Niña asymmetries, and it is found that a group of secondary ENSO modes with more rapidly decorrelating temporal patterns contributes significantly to positively skewed SST and zonal wind statistics. Besides ENSO, fundamental and combination modes representing the tropospheric biennial oscillation (TBO) are found to be consistent with mechanisms for seasonally synchronized biennial variability of the Asian–Australian monsoon and Walker circulation. On longer time scales, a multidecadal pattern referred to as the west Pacific multidecadal mode (WPMM) is established to significantly modulate ENSO and TBO activity, with periods of negative SST anomalies in the western tropical Pacific favoring stronger ENSO and TBO variability. This behavior is attributed to the fact that cold WPMM phases feature anomalous decadal westerlies in the tropical central Pacific, as well as an anomalously flat zonal thermocline profile in the equatorial Pacific. Moreover, the WPMM is found to correlate significantly with decadal precipitation over Australia.

scholarly journals Evaluating vector winds in the Asian-Australian monsoon region simulated by 37 CMIP5 models

2018 ◽  
Vol 53 (1-2) ◽  
pp. 491-507 ◽  
Author(s):  
Fang Huang ◽  
Zhongfeng Xu ◽  
Weidong Guo
Keyword(s):  
Cmip5 Models ◽  
Monsoon Region ◽  
Australian Monsoon

scholarly journals Understanding the Australian Monsoon change during the Last Glacial Maximum with multi-model ensemble

2018 ◽  
Author(s):  
Mi Yan ◽  
Bin Wang ◽  
Jian Liu ◽  
Axing Zhu ◽  
Liang Ning
Keyword(s):  
Last Glacial Maximum ◽  
Moisture Convergence ◽  
Austral Winter ◽  
Upward Motion ◽  
Thermal Contrast ◽  
Australian Monsoon ◽  
Last Glacial ◽  
Annual Range ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract. The response of Australian monsoon to the external forcings and the relative mechanisms during the Last Glacial Maximum (LGM) is investigated by multi-models in CMIP5/PMIP3. Although the annual mean precipitation over Australian monsoon region decreases, the annual range, or the monsoonality, is enhanced. The precipitation increases in early austral summer and decreases in austral winter, causing the annual range or monsoonality to amplify. The decreased precipitation in austral winter has a large contribution to the strengthened monsoonality. It is primarily caused by the weakened upward motion, although the reduced water vapor has also a moderate contribution. The weakened upward motion in austral winter is induced by the enhanced land–sea thermal contrast, which intensifies the divergence over northern Australia. The increased Australian monsoon rainfall in early summer is an integrated result of the positive effect of local dynamic processes (enhanced moisture convergence) and the negative effect of thermodynamics (reduced moisture content). The enhanced moisture convergence is caused by two factors: the strengthened northwest–southeast thermal contrast between the cooler Indochina–western Indonesia and the warmer northeastern Australia, and the east–west sea surface temperature gradients between the warmer western Pacific and cooler eastern Indian Ocean, both due to the alteration of land–sea configuration arising from the sea level drop. The enhanced Australian monsoonality in LGM is caused by the local processes rather than the large scale dynamics, which should be taken into account when investigating its future change under global warming. Our findings may also explain why proxy records indicate different changes in Australian monsoon precipitation during the LGM.

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