scholarly journals Interdecadal variation of Indian Ocean basin mode and the impact on Asian summer climate

2019 ◽  
Vol 46 (21) ◽  
pp. 12388-12397 ◽  
Author(s):  
Bo Sun ◽  
Huixin Li ◽  
Botao Zhou
Keyword(s):  
Indian Ocean ◽  
Ocean Basin ◽  
Interdecadal Variation ◽  
Indian Ocean Basin Mode ◽  
Summer Climate ◽  
Basin Mode ◽  
Asian Summer ◽  
The Impact

Interdecadal Strengthening in the Independent Relationship Between the East Asian Summer Monsoon and the Indian Ocean Basin Mode around the Early 1990s

2021 ◽  
pp. 1-42
Author(s):  
KUI LIU ◽  
LIAN-TONG ZHOU ◽  
ZHIBIAO WANG ◽  
YONG LIU ◽  
XIAOXUE YIN
Keyword(s):  
Indian Ocean ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Ocean Basin ◽  
Indian Ocean Basin Mode ◽  
Basin Mode ◽  
The Indian Ocean ◽  
Asian Summer ◽  
The Relationship

AbstractThis study conducts correlation and regression analyses of the JRA-55 reanalysis data and observational rainfall datasets from China’s National Climate Center. The analyses reveal that interdecadal enhancement in the relationship between the East Asian summer monsoon (EASM) and the Indian Ocean Basin mode (IOBM) after the early 1990s, and the diminished correlation between the EASM and the Niño-3 index. The analyses also reveal that the relationship between EASM-related rainfall/circulation with IOBM also experienced an interdecadal shift at the same time. During the first epoch (1977–1989), EASM-related rainfall was correlated significantly with the Niño-3 index, and accompanied by a Pacific–Japan-like anomaly pattern of horizontal winds. In a subsequent epoch (1994–2014), EASM-related rainfall was correlated significantly with IOBM, and accompanied by a meridional dipole pattern in the horizontal winds. After the 1990s, IOBM exerted influence on EASM through land–sea thermal contrast, and the critical land area was the region 33°–47°N, 110°–140°E. The interdecadal strengthening in the EASM–IOBM linkage around the early 1990s may be attributable to a faster rate of decay of El Niño after the 1990s.

Linking Observations of the Asian Monsoon to the Indian Ocean SST: Possible Roles of Indian Ocean Basin Mode and Dipole Mode

2010 ◽  
Vol 23 (21) ◽  
pp. 5889-5902 ◽  
Author(s):  
Jianling Yang ◽  
Qinyu Liu ◽  
Zhengyu Liu
Keyword(s):  
Indian Ocean ◽  
Atmospheric Circulation ◽  
Summer Monsoon ◽  
Asian Monsoon ◽  
Asian Summer Monsoon ◽  
Ocean Basin ◽  
Indian Ocean Basin Mode ◽  
Basin Mode ◽  
The Indian Ocean ◽  
Asian Summer

Abstract The authors investigate the relationship between sea surface temperature (SST) in the tropical Indian Ocean (TIO) and the seasonal atmosphere circulation in the Asian monsoon region (AMR) using the maximum covariance analyses (MCAs). The results show that the Asian monsoon circulation is significantly correlated with two dominant SST anomaly (SSTA) modes: the Indian Ocean Basin mode (IOB) and the Indian Ocean dipole mode (IOD). The peak SSTA of the IOB appears in spring and has a much stronger relationship with the Asian summer monsoon than the peak of the IOD does, whereas the peak SSTA for the IOD appears in fall and shows a stronger link to the Asian winter monsoon than to the Asian summer monsoon. In addition, the IOB in spring has a relatively stronger link with the atmospheric circulation in summer than in other seasons. The large-scale atmospheric circulation and SSTA patterns of the covariability of the first two dominant MCA modes are described. For the first MCA mode, a warm IOB, persists from spring to summer, and the atmospheric circulation is enhanced by the establishment of the climatological summer monsoon. The increased evaporative moisture associated with the warm IOB is transported to South Asia by the climatological summer monsoon, which increases the moisture convergence toward this region, leading to a significant increase in summer monsoon precipitation. For the second MCA mode, a positive IOD possibly corresponds to a weaker Indian winter monsoon and more precipitation over the southwestern and eastern equatorial TIO.

Understanding the Weakening Relationship of the Pacific Decadal Oscillation and Indian Ocean Basin Mode During Boreal Winter

2021 ◽  
Author(s):  
Jin-Sil Hong ◽  
Sang-Wook Yeh ◽  
Young-Min Yang ◽  
Young-Kwon Lim ◽  
Kyu-Myong Kim
Keyword(s):  
Indian Ocean ◽  
Pacific Decadal Oscillation ◽  
Climate Model ◽  
Ocean Basin ◽  
Boreal Winter ◽  
Indian Ocean Basin Mode ◽  
The Pacific ◽  
Basin Mode ◽  
Relationship Of

Abstract While it is known that the Pacific Decadal Oscillation (PDO) leads the Indian Ocean Basin Mode (IOBM) with the same phase via the atmospheric bridge, we found that the relationship of PDO-IOBM during boreal winter is not stationary. Here, we investigated the PDO-IOBM relationship changes on low-frequency timescales by analyzing the observations, a long-term simulation of climate model with its large ensembles as well as the pacemaker experiments. A long-term simulation of climate model with its large ensemble simulations indicated that the non-stationary relationship of PDO-IOBM is intrinsic in a climate system and it could be at least partly due to internal climate variability. In details, we compared the PDO structures during the entire period with those during the period when the PDO-IOBM relationship was weak (i.e., 1976-2006). We found that the structures of sea surface temperature (SST) as well as its associated tropical Pacific convective forcing during the negative phase of PDO for 1976-2006 are far away from the typical structures of the negative PDO phase during the entire period, which were responsible for the weakening relationship of the PDO-IOBM in the observation. The results of the two pacemaker experiments support that a non-stationary relationship of PDO-IOBM is primarily due to the SST forcing in the Pacific.

A study of biases in simulation of the Indian Ocean basin mode and its capacitor effect in CMIP3/CMIP5 models

2015 ◽  
Vol 46 (1-2) ◽  
pp. 205-226 ◽  
Author(s):  
Weichen Tao ◽  
Gang Huang ◽  
Kaiming Hu ◽  
Hainan Gong ◽  
Guanhuan Wen ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Ocean Basin ◽  
Cmip5 Models ◽  
Indian Ocean Basin Mode ◽  
Basin Mode ◽  
The Indian Ocean

A comparison of full-field and anomaly initialization for seasonal prediction of Indian Ocean basin mode

2019 ◽  
Vol 53 (9-10) ◽  
pp. 6089-6104 ◽  
Author(s):  
Shuai Hu ◽  
Bo Wu ◽  
Tianjun Zhou ◽  
Zhun Guo
Keyword(s):  
Indian Ocean ◽  
Seasonal Prediction ◽  
Ocean Basin ◽  
Indian Ocean Basin Mode ◽  
Full Field ◽  
Basin Mode ◽  
Anomaly Initialization

scholarly journals Interdecadal Indian Ocean Basin Mode Driven by Interdecadal Pacific Oscillation: A Season-Dependent Growth Mechanism

2019 ◽  
Vol 32 (7) ◽  
pp. 2057-2073 ◽  
Author(s):  
Yu Huang ◽  
Bo Wu ◽  
Tim Li ◽  
Tianjun Zhou ◽  
Bo Liu
Keyword(s):  
Indian Ocean ◽  
Equatorial Indian Ocean ◽  
Tropical Indian Ocean ◽  
Ocean Basin ◽  
Heat Fluxes ◽  
Boreal Winter ◽  
Interdecadal Pacific Oscillation ◽  
Indian Ocean Basin Mode ◽  
Remote Forcing ◽  
Basin Mode

The interdecadal variability of basinwide sea surface temperature anomalies (SSTAs) in the tropical Indian Ocean (TIO), referred to as the interdecadal Indian Ocean basin mode (ID-IOBM), is caused by remote forcing of the interdecadal Pacific oscillation (IPO), as demonstrated by the observational datasets and tropical Pacific pacemaker experiments of the Community Earth System Model (CESM). It is noted that the growth of the ID-IOBM shows a season-dependent characteristic, with a maximum tendency of mixed layer heat anomalies occurring in early boreal winter. Three factors contribute to this maximum tendency. In response to the positive IPO forcing, the eastern TIO is covered by the descending branch of the anomalous Walker circulation. Thus, the convection over the southeastern TIO is suppressed, which increases local downward shortwave radiative fluxes. Meanwhile, the equatorial easterly anomalies to the west of the suppressed convection weaken the background mean westerly and thus decrease the upward latent heat fluxes over the equatorial Indian Ocean. Third, anomalous westward Ekman currents driven by the equatorial easterly anomalies advect climatological warm water westward and thus warm the western TIO. In summer, the TIO is out of the control of the positive IPO remote forcing. The ID-IOBM gradually decays due to the Newtonian damping effect.

Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models

2014 ◽  
Vol 35 (3) ◽  
pp. 391-407 ◽  
Author(s):  
Weichen Tao ◽  
Gang Huang ◽  
Kaiming Hu ◽  
Xia Qu ◽  
Guanhuan Wen ◽  
...  
Keyword(s):  
Global Warming ◽  
Indian Ocean ◽  
Ocean Basin ◽  
Cmip5 Models ◽  
Indian Ocean Basin Mode ◽  
Enso Teleconnections ◽  
Basin Mode ◽  
The Indian Ocean

scholarly journals Modulation of the Impacts of the Indian Ocean Basin Mode on Tropical Cyclones over the Northwest Pacific during the Boreal Summer by La Niña Modoki

2019 ◽  
Vol 32 (11) ◽  
pp. 3313-3326 ◽  
Author(s):  
Jingliang Huangfu ◽  
Wen Chen ◽  
Ronghui Huang ◽  
Juan Feng
Keyword(s):  
Indian Ocean ◽  
Ocean Basin ◽  
La Niña ◽  
Sea Surface ◽  
Boreal Summer ◽  
Northwest Pacific ◽  
Indian Ocean Basin Mode ◽  
La Nina ◽  
Basin Mode ◽  
The Indian Ocean

Abstract This paper investigates how La Niña Modoki modulates the impacts of the warm Indian Ocean basin mode (IOBM) on the boreal summer climate and the genesis of tropical cyclones (TCs) over the northwest Pacific (NWP). The results showed that the influence of the Indian Ocean sea surface temperature (SST) on TC genesis is the primary mechanism during the boreal summer, while La Niña Modoki exerts a secondary influence. However, although the summertime index of the IOBM shows a high negative correlation with the number of TCs generated over the NWP, warm IOBM events without La Niña Modoki have only limited influences on the boreal summertime circulations and TC genesis. The present study showed that when warm IOBM events and La Niña Modoki coexisted, the average location of TC genesis shifted westward, and the annual number of generated TCs substantially decreased. La Niña Modoki–related cold sea surface temperature anomalies over the central Pacific further suppressed convective activities over the eastern NWP compared with warm IOBM events without La Niña Modoki. Upper-level convergence and enlarged tropospheric vertical wind shears both contributed to the weakening of the low-level relative vorticity in the coupled cases, leading to a suppressed NWP monsoon trough. Additionally, together with the weaker moisture supply, the impacts of warm IOBM cases were significantly enhanced under the modulation of La Niña Modoki, leading to poorer TC genesis conditions over the eastern NWP. In addition, the energy conversion processes in the aforementioned modulation showed that joint cases will provide fewer initial disturbance seedlings for TC genesis. These results are useful for further understanding the role of warm IOBM cases in TC genesis over the NWP.

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